wip

.github/workflows/ci.yml

@@ -42,18 +42,18 @@ jobs:
         run: zig build all_tests -Dci --verbose
       - name: Run host tests
         run: zig build test_host
-  # build_and_test:
-  #   runs-on: [self-hosted, Linux, X64]
-  #   steps:
-  #     - name: Checkout
-  #       uses: actions/checkout@v3
-  #     - name: Set up Zig
-  #       uses: goto-bus-stop/setup-zig@v2
-  #       with:
-  #         version: master
-  #     - name: Zig environment variables
-  #       run: zig env
-  #     - name: Build test executables
-  #       run: zig build all_tests -Dci -Dci_native --verbose
-  #     - name: Test with QEMU
-  #       run: zig build test_all -Dci -Dci_native --verbose
+  build_and_test:
+    runs-on: [self-hosted, Linux, X64]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Zig
+        uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: master
+      - name: Zig environment variables
+        run: zig env
+      - name: Build test executables
+        run: zig build all_tests -Dci -Dci_native --verbose
+      - name: Test with QEMU
+        run: zig build test_all -Dci -Dci_native --verbose

build.zig

@@ -5,7 +5,7 @@ const os = common.os;
 // Build types
 const Build = std.Build;
 const CompileStep = std.Build.CompileStep;
-const FileSource = std.Build.FileSource;
+const LazyPath = std.Build.LazyPath;
 const Module = std.Build.Module;
 const ModuleDependency = std.Build.ModuleDependency;
 const OptionsStep = std.Build.OptionsStep;
@@ -58,7 +58,7 @@ pub fn build(b_arg: *Build) !void {
         var mods = Modules{};
         inline for (comptime common.enumValues(ModuleID)) |module_id| {
             mods.modules.set(module_id, b.createModule(.{
-                .source_file = FileSource.relative(switch (module_id) {
+                .source_file = LazyPath.relative(switch (module_id) {
                     .limine_installer => "src/bootloader/limine/installer.zig",
                     else => switch (module_id) {
                         .bios, .uefi, .limine => "src/bootloader",
@@ -162,13 +162,13 @@ pub fn build(b_arg: *Build) !void {
         run_native: bool = true,
 
         const C = struct {
-            include_paths: []const []const u8,
+            include_paths: []const LazyPath,
             source_files: []const SourceFile,
             link_libc: bool,
             link_libcpp: bool,
 
             const SourceFile = struct {
-                path: []const u8,
+                path: LazyPath,
                 flags: []const []const u8,
             };
         };
@@ -183,10 +183,10 @@ pub fn build(b_arg: *Build) !void {
             .root_project_path = disk_image_root_path,
             .modules = disk_image_builder_modules,
             .c = .{
-                .include_paths = &.{"src/bootloader/limine/installables"},
+                .include_paths = &.{LazyPath.relative("src/bootloader/limine/installables")},
                 .source_files = &.{
                     .{
-                        .path = "src/bootloader/limine/installables/limine-deploy.c",
+                        .path = LazyPath.relative("src/bootloader/limine/installables/limine-deploy.c"),
                         .flags = &.{},
                     },
                 },
@@ -215,7 +215,7 @@ pub fn build(b_arg: *Build) !void {
             }
 
             for (c.source_files) |source_file| {
-                test_exe.addCSourceFile(source_file.path, source_file.flags);
+                test_exe.addCSourceFile(.{ .file = source_file.path, .flags = source_file.flags });
             }
 
             if (c.link_libc) {
@@ -301,7 +301,7 @@ pub fn build(b_arg: *Build) !void {
                     else => return Error.architecture_not_supported,
                 };
 
-                const cpu_driver_linker_script_path = FileSource.relative(try std.mem.concat(b.allocator, u8, &.{ cpu_driver_path, "/arch/", switch (architecture) {
+                const cpu_driver_linker_script_path = LazyPath.relative(try std.mem.concat(b.allocator, u8, &.{ cpu_driver_path, "/arch/", switch (architecture) {
                     .x86_64 => "x86/64",
                     .x86 => "x86/32",
                     else => @tagName(architecture),
@@ -311,7 +311,7 @@ pub fn build(b_arg: *Build) !void {
 
                 var user_module_list = try std.ArrayList(*CompileStep).initCapacity(b.allocator, user_modules.len);
                 const user_architecture_source_path = try std.mem.concat(b.allocator, u8, &.{ "src/user/arch/", @tagName(architecture), "/" });
-                const user_linker_script_path = FileSource.relative(try std.mem.concat(b.allocator, u8, &.{ user_architecture_source_path, "linker_script.ld" }));
+                const user_linker_script_path = LazyPath.relative(try std.mem.concat(b.allocator, u8, &.{ user_architecture_source_path, "linker_script.ld" }));
                 for (user_modules) |module| {
                     const user_module = try addCompileStep(.{
                         .kind = executable_kind,
@@ -353,9 +353,9 @@ pub fn build(b_arg: *Build) !void {
 
                                         executable.strip = true;
 
-                                        executable.addAssemblyFile("src/bootloader/arch/x86/64/smp_trampoline.S");
-                                        executable.addAssemblyFile(bootloader_path ++ "/unreal_mode.S");
-                                        executable.setLinkerScriptPath(FileSource.relative(bootloader_path ++ "/linker_script.ld"));
+                                        executable.addAssemblyFile(LazyPath.relative("src/bootloader/arch/x86/64/smp_trampoline.S"));
+                                        executable.addAssemblyFile(LazyPath.relative(bootloader_path ++ "/unreal_mode.S"));
+                                        executable.setLinkerScriptPath(LazyPath.relative(bootloader_path ++ "/linker_script.ld"));
                                         executable.code_model = .small;
 
                                         break :blk executable;
@@ -380,7 +380,7 @@ pub fn build(b_arg: *Build) !void {
                                     executable.strip = true;
 
                                     switch (architecture) {
-                                        .x86_64 => executable.addAssemblyFile("src/bootloader/arch/x86/64/smp_trampoline.S"),
+                                        .x86_64 => executable.addAssemblyFile(LazyPath.relative("src/bootloader/arch/x86/64/smp_trampoline.S")),
                                         else => {},
                                     }
 
@@ -405,7 +405,7 @@ pub fn build(b_arg: *Build) !void {
 
                                 executable.code_model = cpu_driver.code_model;
 
-                                executable.setLinkerScriptPath(FileSource.relative(try common.concat(b.allocator, u8, &.{ limine_loader_path ++ "arch/", @tagName(architecture), "/linker_script.ld" })));
+                                executable.setLinkerScriptPath(LazyPath.relative(try common.concat(b.allocator, u8, &.{ limine_loader_path ++ "arch/", @tagName(architecture), "/linker_script.ld" })));
 
                                 break :blk executable;
                             },
@@ -591,13 +591,13 @@ fn addFileSize(artifact: *CompileStep, comptime name: []const u8) void {
 
 fn newRunnerRunArtifact(arguments: struct {
     configuration: Configuration,
-    disk_image_path: FileSource,
+    disk_image_path: LazyPath,
     loader: *CompileStep,
     runner: *CompileStep,
     cpu_driver: *CompileStep,
     user_init: *CompileStep,
     qemu_options: QEMUOptions,
-    ovmf_path: FileSource,
+    ovmf_path: LazyPath,
     is_default: bool,
 }) !*RunStep {
     const runner = b.addRunArtifact(arguments.runner);
@@ -610,12 +610,12 @@ fn newRunnerRunArtifact(arguments: struct {
         .cpu_driver => runner.addArtifactArg(arguments.cpu_driver),
         .loader_path => runner.addArtifactArg(arguments.loader),
         .init => runner.addArtifactArg(arguments.user_init),
-        .disk_image_path => runner.addFileSourceArg(arguments.disk_image_path),
+        .disk_image_path => runner.addFileArg(arguments.disk_image_path),
         .qemu_options => inline for (common.fields(QEMUOptions)) |field| runner.addArg(if (@field(arguments.qemu_options, field.name)) "true" else "false"),
         .ci => runner.addArg(if (ci) "true" else "false"),
         .debug_user => runner.addArg(if (debug_user) "true" else "false"),
         .debug_loader => runner.addArg(if (debug_loader) "true" else "false"),
-        .ovmf_path => runner.addFileSourceArg(arguments.ovmf_path),
+        .ovmf_path => runner.addFileArg(arguments.ovmf_path),
         .is_default => runner.addArg(if (arguments.is_default) "true" else "false"),
     };
 
@@ -631,15 +631,17 @@ const ExecutableDescriptor = struct {
     modules: []const ModuleID,
 };
 
+const main_package_path = LazyPath.relative(source_root_dir);
 fn addCompileStep(executable_descriptor: ExecutableDescriptor) !*CompileStep {
     const main_file = try std.mem.concat(b.allocator, u8, &.{ executable_descriptor.root_project_path, "/main.zig" });
     const compile_step = switch (executable_descriptor.kind) {
         .exe => blk: {
             const executable = b.addExecutable(.{
                 .name = executable_descriptor.name,
-                .root_source_file = FileSource.relative(main_file),
+                .root_source_file = LazyPath.relative(main_file),
                 .target = executable_descriptor.target,
                 .optimize = executable_descriptor.optimize_mode,
+                .main_pkg_path = main_package_path,
             });
 
             build_steps.build_all.dependOn(&executable.step);
@@ -647,13 +649,14 @@ fn addCompileStep(executable_descriptor: ExecutableDescriptor) !*CompileStep {
             break :blk executable;
         },
         .@"test" => blk: {
-            const test_file = FileSource.relative(try std.mem.concat(b.allocator, u8, &.{ executable_descriptor.root_project_path, "/test.zig" }));
+            const test_file = LazyPath.relative(try std.mem.concat(b.allocator, u8, &.{ executable_descriptor.root_project_path, "/test.zig" }));
             const test_exe = b.addTest(.{
                 .name = executable_descriptor.name,
                 .root_source_file = test_file,
                 .target = executable_descriptor.target,
                 .optimize = executable_descriptor.optimize_mode,
                 .test_runner = if (executable_descriptor.target.os_tag) |_| main_file else null,
+                .main_pkg_path = main_package_path,
             });
 
             build_steps.build_all_tests.dependOn(&test_exe.step);
@@ -669,8 +672,6 @@ fn addCompileStep(executable_descriptor: ExecutableDescriptor) !*CompileStep {
         compile_step.entry_symbol_name = "_start";
     }
 
-    compile_step.setMainPkgPath(source_root_dir);
-
     for (executable_descriptor.modules) |module| {
         modules.addModule(compile_step, module);
     }

config/default.json

@@ -1,7 +1,7 @@
 {
     "architecture": "x86_64",
-    "bootloader": "limine",
-    "boot_protocol": "uefi",
+    "bootloader": "birth",
+    "boot_protocol": "bios",
     "execution_environment": "qemu",
     "optimize_mode": "Debug",
     "execution_type": "emulated",

src/birth.zig

@@ -10,7 +10,7 @@ pub const UserScheduler = extern struct {
     disabled: bool,
     has_work: bool,
     core_id: u32,
-    setup_stack: [lib.arch.valid_page_sizes[0]]u8 align(lib.arch.stack_alignment),
+    setup_stack: [lib.arch.valid_page_sizes[0] * 4]u8 align(lib.arch.stack_alignment),
     setup_stack_lock: lib.Atomic(bool),
 
     pub inline fn architectureSpecific(user_scheduler: *UserScheduler) *arch.UserScheduler {

src/birth/capabilities.zig

@@ -7,6 +7,15 @@ const syscall = birth.syscall;
 
 const Capabilities = @This();
 
+pub const Reference = packed struct(usize) {
+    integer: usize,
+};
+
+pub const RAM = packed struct(u64) {
+    block: u32,
+    region: u32,
+};
+
 pub const Type = enum(u8) {
     io, // primitive
     cpu, // primitive
@@ -21,7 +30,7 @@ pub const Type = enum(u8) {
 
     // _,
 
-    pub const Type = u8;
+    pub const BackingType = @typeInfo(Type).Enum.tag_type;
 
     pub const Mappable = enum {
         cpu_memory,
@@ -47,6 +56,7 @@ pub fn CommandBuilder(comptime list: []const []const u8) type {
         "revoke",
         "create",
     } ++ list;
+
     const enum_fields = lib.enumAddNames(&.{}, capability_base_command_list);
 
     // TODO: make this non-exhaustive enums
@@ -75,16 +85,17 @@ pub fn Command(comptime capability: Type) type {
             "shutdown",
             "get_command_buffer",
         },
-        .ram => [_][]const u8{},
-        .cpu_memory => .{
+        .ram => .{
             "allocate",
         },
+        .cpu_memory => [_][]const u8{},
         .boot => .{
             "get_bundle_size",
             "get_bundle_file_list_size",
         },
         .process => .{
             "exit",
+            "panic",
         },
         .page_table => [_][]const u8{},
     };
@@ -94,248 +105,352 @@ pub fn Command(comptime capability: Type) type {
 
 const success = 0;
 const first_valid_error = success + 1;
-
 pub fn ErrorSet(comptime error_names: []const []const u8) type {
-    return lib.ErrorSet(error_names, &.{
-        .{
-            .name = "forbidden",
-            .value = first_valid_error + 0,
-        },
-        .{
-            .name = "corrupted_input",
-            .value = first_valid_error + 1,
-        },
-        .{
-            .name = "invalid_input",
-            .value = first_valid_error + 2,
-        },
-    });
+    const predefined_error_names = &.{ "forbidden", "corrupted_input", "invalid_input" };
+    comptime var current_error = first_valid_error;
+    comptime var predefined_errors: []const lib.Type.EnumField = &.{};
+
+    inline for (predefined_error_names) |predefined_error_name| {
+        defer current_error += 1;
+
+        predefined_errors = predefined_errors ++ .{
+            .{
+                .name = predefined_error_name,
+                .value = current_error,
+            },
+        };
+    }
+
+    return lib.ErrorSet(error_names, predefined_errors);
 }
 
 const raw_argument_count = @typeInfo(syscall.Arguments).Array.len;
 
-pub fn Syscall(comptime capability_type: Type, comptime command_type: Command(capability_type)) type {
-    const Types = switch (capability_type) {
-        .io => switch (command_type) {
-            .copy, .mint, .retype, .delete, .revoke, .create => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = void;
-                pub const Arguments = void;
+const DefaultErrorSet = Capabilities.ErrorSet(&.{});
+const Types = struct {
+    Result: type = void,
+    Arguments: type = void,
+    ErrorSet: type = DefaultErrorSet,
+};
+
+fn Functions(comptime T: Types) type {
+    const ToArguments = fn (syscall.Arguments) callconv(.Inline) T.ErrorSet.Error!T.Arguments;
+    const FromArguments = fn (T.Arguments) callconv(.Inline) syscall.Arguments;
+
+    return switch (T.Result) {
+        else => blk: {
+            const ToResult = fn (syscall.Result.Birth) callconv(.Inline) T.Result;
+            const FromResult = fn (T.Result) callconv(.Inline) syscall.Result;
+
+            // return if (T.Result == void and T.Arguments == void and T.ErrorSet == DefaultErrorSet) struct {
+            break :blk if (T.ErrorSet == DefaultErrorSet and T.Result == void and T.Arguments == void) struct {
+                toResult: ToResult = voidToResult,
+                fromResult: FromResult = voidFromResult,
+                toArguments: ToArguments = voidToArguments,
+                fromArguments: FromArguments = voidFromArguments,
+            } else if (T.ErrorSet == DefaultErrorSet and T.Result == void) struct {
+                toResult: ToResult = voidToResult,
+                fromResult: FromResult = voidFromResult,
+                toArguments: ToArguments,
+                fromArguments: FromArguments,
+            } else if (T.ErrorSet == DefaultErrorSet and T.Arguments == void) struct {
+                toResult: ToResult,
+                fromResult: FromResult,
+                toArguments: ToArguments = voidToArguments,
+                fromArguments: FromArguments = voidFromArguments,
+            } else struct {
+                toResult: ToResult,
+                fromResult: FromResult,
+                toArguments: ToArguments,
+                fromArguments: FromArguments,
+            };
+        },
+        noreturn => if (T.ErrorSet == DefaultErrorSet and T.Arguments == void) struct {
+            toArguments: ToArguments = voidToArguments,
+            fromArguments: FromArguments = voidFromArguments,
+        } else struct {
+            toArguments: ToArguments,
+            fromArguments: FromArguments,
+        },
+    };
+}
+
+fn Descriptor(comptime T: Types) type {
+    return struct {
+        types: Types = T,
+        functions: Functions(T),
+    };
+}
+
+fn CommandDescriptor(comptime capability: Type, comptime command: Command(capability)) type {
+    return Descriptor(switch (capability) {
+        .io => switch (command) {
+            .log => .{
+                .Result = usize,
+                .Arguments = []const u8,
             },
-            .log => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = usize;
-                pub const Arguments = []const u8;
+            else => .{},
+        },
+        .ram => switch (command) {
+            .allocate => .{
+                .Result = Reference,
+                .Arguments = usize,
+                .ErrorSet = ErrorSet(&.{"OutOfMemory"}),
+            },
+            else => .{},
+        },
+        .process => switch (command) {
+            .exit => .{
+                .Result = noreturn,
+                .Arguments = bool,
+            },
+            .panic => .{
+                .Result = noreturn,
+                .Arguments = struct {
+                    message: []const u8,
+                    exit_code: u64,
+                },
+            },
+            else => .{},
+        },
+        .cpu => switch (command) {
+            .get_core_id => .{
+                .Result = u32,
+            },
+            .shutdown => .{
+                .Result = noreturn,
+            },
+            // .get_command_buffer = .{
+            // },
+            else => .{},
+        },
+        .boot => switch (command) {
+            .get_bundle_file_list_size, .get_bundle_size => .{
+                .Result = usize,
+            },
+            else => .{},
+        },
+        else => .{},
+    });
+}
 
-                inline fn toResult(raw_result: syscall.Result.Birth) Result {
-                    return raw_result.second;
-                }
+pub fn Syscall(comptime cap: Type, comptime com: Command(cap)) type {
+    const D = CommandDescriptor(cap, com);
+    const T = @as(?*const Types, @ptrCast(@typeInfo(D).Struct.fields[0].default_value)).?.*;
+    const d = D{
+        .functions = switch (cap) {
+            .ram => switch (com) {
+                .allocate => blk: {
+                    const F = struct {
+                        inline fn toResult(raw_result: syscall.Result.Birth) Reference {
+                            return @bitCast(raw_result.second);
+                        }
 
-                inline fn resultToRaw(result: Result) syscall.Result {
-                    return syscall.Result{
-                        .birth = .{
-                            .first = .{},
-                            .second = result,
-                        },
+                        inline fn fromResult(result: Reference) syscall.Result {
+                            return .{
+                                .birth = .{
+                                    .first = .{},
+                                    .second = @bitCast(result),
+                                },
+                            };
+                        }
+
+                        inline fn toArguments(raw_arguments: syscall.Arguments) T.ErrorSet.Error!usize {
+                            const size = raw_arguments[0];
+                            return size;
+                        }
+
+                        inline fn fromArguments(arguments: usize) syscall.Arguments {
+                            const result = [1]usize{arguments};
+                            return result ++ .{0} ** (raw_argument_count - result.len);
+                        }
                     };
-                }
-
-                inline fn argumentsToRaw(arguments: Arguments) syscall.Arguments {
-                    const result = [2]usize{ @intFromPtr(arguments.ptr), arguments.len };
-                    return result ++ .{0} ** (raw_argument_count - result.len);
-                }
-
-                inline fn toArguments(raw_arguments: syscall.Arguments) !Arguments {
-                    const message_ptr = @as(?[*]const u8, @ptrFromInt(raw_arguments[0])) orelse return error.invalid_input;
-                    const message_len = raw_arguments[1];
-                    if (message_len == 0) return error.invalid_input;
-                    const message = message_ptr[0..message_len];
-                    return message;
-                }
-            },
-        },
-        .cpu => switch (command_type) {
-            .copy, .mint, .retype, .delete, .revoke, .create => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = void;
-                pub const Arguments = void;
-            },
-            .get_core_id => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = u32;
-                pub const Arguments = void;
-
-                inline fn toResult(raw_result: syscall.Result.birth) Result {
-                    return @as(Result, @intCast(raw_result.second));
-                }
-
-                inline fn resultToRaw(result: Result) syscall.Result {
-                    return syscall.Result{
-                        .birth = .{
-                            .first = .{},
-                            .second = result,
-                        },
+                    break :blk .{
+                        .toResult = F.toResult,
+                        .fromResult = F.fromResult,
+                        .toArguments = F.toArguments,
+                        .fromArguments = F.fromArguments,
                     };
-                }
+                },
+                else => .{},
             },
-            .shutdown => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = noreturn;
-                pub const Arguments = void;
+            .process => switch (com) {
+                .exit => blk: {
+                    const F = struct {
+                        inline fn toArguments(raw_arguments: syscall.Arguments) T.ErrorSet.Error!T.Arguments {
+                            const result = raw_arguments[0] != 0;
+                            return result;
+                        }
 
-                pub const toResult = @compileError("noreturn unexpectedly returned");
-            },
-            .get_command_buffer => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = noreturn;
-                pub const Arguments = *birth.CommandBuffer;
-
-                pub const toResult = @compileError("noreturn unexpectedly returned");
-
-                inline fn toArguments(raw_arguments: syscall.Arguments) !Arguments {
-                    const ptr = @as(?*birth.CommandBuffer, @ptrFromInt(raw_arguments[0])) orelse return error.invalid_input;
-                    return ptr;
-                }
-
-                inline fn argumentsToRaw(arguments: Arguments) syscall.Arguments {
-                    const result = [1]usize{@intFromPtr(arguments)};
-                    return result ++ .{0} ** (raw_argument_count - result.len);
-                }
-            },
-        },
-        .ram => struct {
-            pub const ErrorSet = Capabilities.ErrorSet(&.{});
-            pub const Result = void;
-            pub const Arguments = void;
-        },
-        .cpu_memory => struct {
-            pub const ErrorSet = Capabilities.ErrorSet(&.{
-                "OutOfMemory",
-            });
-            pub const Result = PhysicalAddress;
-            pub const Arguments = usize;
-
-            inline fn toResult(raw_result: syscall.Result.birth) Result {
-                return PhysicalAddress.new(raw_result.second);
-            }
-
-            inline fn resultToRaw(result: Result) syscall.Result {
-                return syscall.Result{
-                    .birth = .{
-                        .first = .{},
-                        .second = result.value(),
-                    },
-                };
-            }
-
-            inline fn toArguments(raw_arguments: syscall.Arguments) !Arguments {
-                const size = raw_arguments[0];
-                return size;
-            }
-
-            inline fn argumentsToRaw(arguments: Arguments) syscall.Arguments {
-                const result = [1]usize{arguments};
-                return result ++ .{0} ** (raw_argument_count - result.len);
-            }
-        },
-        .boot => switch (command_type) {
-            .get_bundle_file_list_size, .get_bundle_size => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{
-                    "buffer_too_small",
-                });
-                pub const Result = usize;
-                pub const Arguments = void;
-
-                inline fn resultToRaw(result: Result) syscall.Result {
-                    return syscall.Result{
-                        .birth = .{
-                            .first = .{},
-                            .second = result,
-                        },
+                        inline fn fromArguments(arguments: T.Arguments) syscall.Arguments {
+                            const result = [1]usize{@intFromBool(arguments)};
+                            return result ++ .{0} ** (raw_argument_count - result.len);
+                        }
                     };
-                }
+                    break :blk .{
+                        // .toResult = F.toResult,
+                        // .fromResult = F.fromResult,
+                        .toArguments = F.toArguments,
+                        .fromArguments = F.fromArguments,
+                    };
+                },
+                .panic => blk: {
+                    const F = struct {
+                        inline fn toArguments(raw_arguments: syscall.Arguments) T.ErrorSet.Error!T.Arguments {
+                            if (@as(?[*]const u8, @ptrFromInt(raw_arguments[0]))) |message_ptr| {
+                                const message_len = raw_arguments[1];
 
-                inline fn toResult(raw_result: syscall.Result.birth) Result {
-                    return raw_result.second;
-                }
-            },
-            else => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{
-                    "buffer_too_small",
-                });
-                pub const Result = void;
-                pub const Arguments = void;
-            },
-        },
-        .process => switch (command_type) {
-            .exit => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = noreturn;
-                pub const Arguments = bool;
+                                if (message_len != 0) {
+                                    const message = message_ptr[0..message_len];
+                                    const exit_code = raw_arguments[2];
 
-                inline fn toArguments(raw_arguments: syscall.Arguments) !Arguments {
-                    const result = raw_arguments[0] != 0;
-                    return result;
-                }
-                inline fn argumentsToRaw(arguments: Arguments) syscall.Arguments {
-                    const result = [1]usize{@intFromBool(arguments)};
-                    return result ++ .{0} ** (raw_argument_count - result.len);
-                }
+                                    return .{
+                                        .message = message,
+                                        .exit_code = exit_code,
+                                    };
+                                }
+                            }
+
+                            return error.invalid_input;
+                        }
+
+                        inline fn fromArguments(arguments: T.Arguments) syscall.Arguments {
+                            const result: [3]usize = .{ @intFromPtr(arguments.message.ptr), arguments.message.len, arguments.exit_code };
+                            return result ++ .{0} ** (raw_argument_count - result.len);
+                        }
+                    };
+                    break :blk .{
+                        .toArguments = F.toArguments,
+                        .fromArguments = F.fromArguments,
+                    };
+                },
+                else => .{},
             },
-            else => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = void;
-                pub const Arguments = void;
+            .io => switch (com) {
+                .log => blk: {
+                    const F = struct {
+                        inline fn toResult(raw_result: syscall.Result.Birth) T.Result {
+                            return raw_result.second;
+                        }
+
+                        inline fn fromResult(result: T.Result) syscall.Result {
+                            return syscall.Result{
+                                .birth = .{
+                                    .first = .{},
+                                    .second = result,
+                                },
+                            };
+                        }
+
+                        inline fn toArguments(raw_arguments: syscall.Arguments) T.ErrorSet.Error!T.Arguments {
+                            const message_ptr = @as(?[*]const u8, @ptrFromInt(raw_arguments[0])) orelse return error.invalid_input;
+                            const message_len = raw_arguments[1];
+                            if (message_len == 0) return error.invalid_input;
+                            const message = message_ptr[0..message_len];
+                            return message;
+                        }
+
+                        inline fn fromArguments(arguments: T.Arguments) syscall.Arguments {
+                            const result = [2]usize{ @intFromPtr(arguments.ptr), arguments.len };
+                            return result ++ .{0} ** (raw_argument_count - result.len);
+                        }
+                    };
+                    break :blk .{
+                        .toResult = F.toResult,
+                        .fromResult = F.fromResult,
+                        .toArguments = F.toArguments,
+                        .fromArguments = F.fromArguments,
+                    };
+                },
+                else => .{},
             },
+            .cpu => switch (com) {
+                .get_core_id => blk: {
+                    const F = struct {
+                        inline fn toResult(raw_result: syscall.Result.Birth) T.Result {
+                            return @as(T.Result, @intCast(raw_result.second));
+                        }
+
+                        inline fn fromResult(result: T.Result) syscall.Result {
+                            return syscall.Result{
+                                .birth = .{
+                                    .first = .{},
+                                    .second = result,
+                                },
+                            };
+                        }
+                    };
+                    break :blk .{
+                        .toResult = F.toResult,
+                        .fromResult = F.fromResult,
+                    };
+                },
+                .shutdown => .{
+                    .toArguments = voidToArguments,
+                    .fromArguments = voidFromArguments,
+                },
+                .get_command_buffer => .{
+                    //             .get_command_buffer => struct {
+                    //                 pub const ErrorSet = Capabilities.ErrorSet(&.{});
+                    //                 pub const Result = noreturn;
+                    //                 pub const Arguments = *birth.CommandBuffer;
+                    //
+                    //                 pub const toResult = @compileError("noreturn unexpectedly returned");
+                    //
+                    //                 inline fn toArguments(raw_arguments: syscall.Arguments) !Arguments {
+                    //                     const ptr = @as(?*birth.CommandBuffer, @ptrFromInt(raw_arguments[0])) orelse return error.invalid_input;
+                    //                     return ptr;
+                    //                 }
+                    //
+                    //                 inline fn argumentsToRaw(arguments: Arguments) syscall.Arguments {
+                    //                     const result = [1]usize{@intFromPtr(arguments)};
+                    //                     return result ++ .{0} ** (raw_argument_count - result.len);
+                    //                 }
+                    //             },
+                },
+                else => .{},
+            },
+            .boot => switch (com) {
+                .get_bundle_file_list_size, .get_bundle_size => blk: {
+                    const F = struct {
+                        inline fn toResult(raw_result: syscall.Result.Birth) T.Result {
+                            return raw_result.second;
+                        }
+                        inline fn fromResult(result: T.Result) syscall.Result {
+                            return syscall.Result{
+                                .birth = .{
+                                    .first = .{},
+                                    .second = result,
+                                },
+                            };
+                        }
+                    };
+
+                    break :blk .{
+                        .toResult = F.toResult,
+                        .fromResult = F.fromResult,
+                    };
+                },
+                else => .{},
+            },
+            else => .{},
         },
-        .page_table => switch (command_type) {
-            else => struct {
-                pub const ErrorSet = Capabilities.ErrorSet(&.{});
-                pub const Result = void;
-                pub const Arguments = void;
-            },
-        },
-        // else => @compileError("TODO: " ++ @tagName(capability)),
     };
 
     return struct {
-        pub const ErrorSet = Types.ErrorSet;
-        pub const Result = Types.Result;
-        pub const Arguments = Types.Arguments;
-        pub const toResult = Types.toResult;
-        pub const toArguments = if (Arguments != void)
-            Types.toArguments
-        else
-            struct {
-                fn lambda(raw_arguments: syscall.Arguments) error{}!void {
-                    _ = raw_arguments;
-                    return {};
-                }
-            }.lambda;
-        pub const capability = capability_type;
-        pub const command = command_type;
+        pub const capability = cap;
+        pub const command = com;
+        pub const Error = T.ErrorSet.Error;
+        pub const Result = T.Result;
 
-        pub inline fn resultToRaw(result: Result) syscall.Result {
-            return if (@hasDecl(Types, "resultToRaw")) blk: {
-                comptime assert(Result != void and Result != noreturn);
-                break :blk Types.resultToRaw(result);
-            } else blk: {
-                if (Result != void) {
-                    @compileError("expected void type, got " ++ @typeName(Result) ++ ". You forgot to implement a resultToRaw function" ++ " for (" ++ @tagName(capability) ++ ", " ++ @tagName(command) ++ ").");
-                }
+        pub const toResult = d.functions.toResult;
+        pub const fromResult = d.functions.fromResult;
+        pub const toArguments = d.functions.toArguments;
+        pub const fromArguments = d.functions.fromArguments;
 
-                break :blk syscall.Result{
-                    .birth = .{
-                        .first = .{},
-                        .second = 0,
-                    },
-                };
-            };
-        }
-
-        pub inline fn errorToRaw(err: @This().ErrorSet.Error) syscall.Result {
+        pub inline fn fromError(err: Error) syscall.Result {
             const error_enum = switch (err) {
-                inline else => |comptime_error| @field(@This().ErrorSet.Enum, @errorName(comptime_error)),
+                inline else => |comptime_error| @field(T.ErrorSet.Enum, @errorName(comptime_error)),
             };
             return syscall.Result{
                 .birth = .{
@@ -347,9 +462,8 @@ pub fn Syscall(comptime capability_type: Type, comptime command_type: Command(ca
             };
         }
 
-        /// This is not meant to be called in the CPU driver
-        pub fn blocking(arguments: Arguments) @This().ErrorSet.Error!Result {
-            const raw_arguments = if (Arguments != void) Types.argumentsToRaw(arguments) else [1]usize{0} ** raw_argument_count;
+        pub fn blocking(arguments: T.Arguments) Error!Result {
+            const raw_arguments = d.functions.fromArguments(arguments);
             // TODO: make this more reliable and robust?
             const options = birth.syscall.Options{
                 .birth = .{
@@ -362,20 +476,46 @@ pub fn Syscall(comptime capability_type: Type, comptime command_type: Command(ca
 
             const raw_error_value = raw_result.birth.first.@"error";
             comptime {
-                assert(!@hasField(@This().ErrorSet.Enum, "ok"));
-                assert(!@hasField(@This().ErrorSet.Enum, "success"));
-                assert(lib.enumFields(@This().ErrorSet.Enum)[0].value == first_valid_error);
+                assert(lib.enumFields(T.ErrorSet.Enum)[0].value == first_valid_error);
             }
 
             return switch (raw_error_value) {
-                success => switch (Result) {
+                success => switch (T.Result) {
                     noreturn => unreachable,
-                    else => toResult(raw_result.birth),
+                    else => d.functions.toResult(raw_result.birth),
                 },
-                else => switch (@as(@This().ErrorSet.Enum, @enumFromInt(raw_error_value))) {
-                    inline else => |comptime_error_enum| @field(@This().ErrorSet.Error, @tagName(comptime_error_enum)),
+                else => switch (@as(T.ErrorSet.Enum, @enumFromInt(raw_error_value))) {
+                    inline else => |comptime_error_enum| @field(Error, @tagName(comptime_error_enum)),
                 },
             };
         }
+
+        pub fn buffer(command_buffer: *birth.CommandBuffer, arguments: T.Arguments) void {
+            _ = arguments;
+            _ = command_buffer;
+
+            @panic("TODO: buffer");
+        }
     };
 }
+
+inline fn voidToResult(raw_result: syscall.Result.Birth) void {
+    _ = raw_result;
+
+    @panic("TODO: voidToResult");
+}
+
+inline fn voidFromResult(result: void) syscall.Result {
+    _ = result;
+
+    @panic("TODO: voidFromResult");
+}
+
+inline fn voidToArguments(raw_arguments: syscall.Arguments) DefaultErrorSet.Error!void {
+    _ = raw_arguments;
+}
+
+inline fn voidFromArguments(arguments: void) syscall.Arguments {
+    _ = arguments;
+    return [6]usize{0};
+}

src/birth/syscall.zig

@@ -5,8 +5,7 @@ const log = lib.log.scoped(.Syscall);
 const birth = @import("birth");
 const capabilities = birth.capabilities;
 
-pub const argument_count = 6;
-pub const Arguments = [argument_count]usize;
+pub const Arguments = [6]usize;
 
 pub const Convention = enum(u1) {
     linux = 0,
@@ -44,18 +43,20 @@ pub const Options = extern union {
     pub const Birth = packed struct(u64) {
         type: capabilities.Type,
         command: capabilities.Subtype,
-        reserved: lib.IntType(.unsigned, @bitSizeOf(u64) - @bitSizeOf(capabilities.Type) - @bitSizeOf(capabilities.Subtype) - @bitSizeOf(Convention)) = 0,
+        reserved: ReservedInt = 0,
         convention: Convention = .birth,
 
+        const ReservedInt = lib.IntType(.unsigned, @bitSizeOf(u64) - @bitSizeOf(capabilities.Type) - @bitSizeOf(capabilities.Subtype) - @bitSizeOf(Convention));
+
         comptime {
             Options.assertSize(@This());
         }
 
-        const IDInteger = u16;
-        pub const ID = enum(IDInteger) {
-            qemu_exit = 0,
-            print = 1,
-        };
+        // const IDInteger = u16;
+        // pub const ID = enum(IDInteger) {
+        //     qemu_exit = 0,
+        //     print = 1,
+        // };
     };
 
     pub const Linux = enum(u64) {

src/bootloader/bios.zig

@@ -68,10 +68,8 @@ pub const Disk = extern struct {
                 .segment = 0,
                 .lba = lba,
             };
-            lib.log.debug("DAP: {}", .{dap});
 
             const dap_address = @intFromPtr(&dap);
-            lib.log.debug("DAP address: 0x{x}", .{dap_address});
             const dap_offset = offset(dap_address);
             const dap_segment = segment(dap_address);
             var registers = Registers{
@@ -81,9 +79,7 @@ pub const Disk = extern struct {
                 .ds = dap_segment,
             };
 
-            lib.log.debug("Start int", .{});
             interrupt(0x13, &registers, &registers);
-            lib.log.debug("End int", .{});
 
             if (registers.eflags.flags.carry_flag) return error.read_error;
 
@@ -92,7 +88,6 @@ pub const Disk = extern struct {
             const src_slice = buffer[0..bytes_to_copy];
 
             if (maybe_provided_buffer) |provided_buffer| {
-                lib.log.debug("A", .{});
                 const dst_slice = provided_buffer[@as(usize, @intCast(provided_buffer_offset))..][0..bytes_to_copy];
 
                 // TODO: report Zig that this codegen is so bad that we have to use rep movsb instead to make it go fast
@@ -114,7 +109,7 @@ pub const Disk = extern struct {
                     @memcpy(dst_slice, src_slice);
                 }
             } else {
-                lib.log.debug("B", .{});
+                //lib.log.debug("B", .{});
             }
         }
 

src/bootloader/birth/bios/main.zig

@@ -5,8 +5,7 @@ const log = lib.log;
 const privileged = @import("privileged");
 const ACPI = privileged.ACPI;
 const MemoryManager = privileged.MemoryManager;
-const PhysicalHeap = privileged.PhyicalHeap;
-const writer = privileged.writer;
+pub const writer = privileged.writer;
 
 const stopCPU = privileged.arch.stopCPU;
 const GDT = privileged.arch.x86_64.GDT;
@@ -54,10 +53,7 @@ pub const std_options = struct {
         _ = format;
         _ = scope;
         _ = level;
-        // _ = level;
-        // writer.writeByte('[') catch stopCPU();
-        // writer.writeAll(@tagName(scope)) catch stopCPU();
-        // writer.writeAll("] ") catch stopCPU();
+        _ = level;
         // lib.format(writer, format, args) catch stopCPU();
         // writer.writeByte('\n') catch stopCPU();
     }
@@ -83,17 +79,13 @@ const Filesystem = extern struct {
     }
 
     pub fn readFile(filesystem: *Filesystem, file_path: []const u8, file_buffer: []u8) ![]const u8 {
-        log.debug("File {s} read started", .{file_path});
         assert(filesystem.fat_allocator.allocated <= filesystem.fat_allocator.buffer.len);
         const file = try filesystem.fat_cache.readFileToBuffer(file_path, file_buffer);
-        log.debug("File read succeeded", .{});
         return file;
     }
 
     pub fn sneakFile(filesystem: *Filesystem, file_path: []const u8, size: usize) ![]const u8 {
-        log.debug("File {s} read started", .{file_path});
         const file = try filesystem.fat_cache.readFileToCache(file_path, size);
-        log.debug("File read succeeded", .{});
         return file;
     }
 

src/bootloader/uefi.zig

@@ -25,9 +25,6 @@ pub const page_size = 0x1000;
 pub const page_shifter = lib.arch.page_shifter(page_size);
 
 const privileged = @import("privileged");
-const PhysicalAddress = privileged.PhysicalAddress;
-const VirtualAddress = privileged.VirtualAddress;
-const VirtualMemoryRegion = privileged.VirtualMemoryRegion;
 const stopCPU = privileged.arch.stopCPU;
 
 pub fn panic(comptime format: []const u8, arguments: anytype) noreturn {

src/cpu.zig

@@ -13,34 +13,25 @@ const PhysicalAddress = lib.PhysicalAddress;
 const PhysicalAddressSpace = lib.PhysicalAddressSpace;
 const PhysicalMemoryRegion = lib.PhysicalMemoryRegion;
 const stopCPU = privileged.arch.stopCPU;
-const VirtualAddress = privileged.VirtualAddress;
-const VirtualMemoryRegion = privileged.VirtualMemoryRegion;
+const VirtualAddress = lib.VirtualAddress;
+const VirtualMemoryRegion = lib.VirtualMemoryRegion;
 
 const birth = @import("birth");
 
 pub const test_runner = @import("cpu/test_runner.zig");
 pub const arch = @import("cpu/arch.zig");
 pub const capabilities = @import("cpu/capabilities.zig");
+pub const syscall = @import("cpu/syscall.zig");
 
 pub export var stack: [0x8000]u8 align(0x1000) = undefined;
-pub export var page_allocator = PageAllocator{
-    .head = null,
-    .list_allocator = .{
-        .u = .{
-            .primitive = .{
-                .backing_4k_page = undefined,
-                .allocated = 0,
-            },
-        },
-        .primitive = true,
-    },
-};
 
 pub var bundle: []const u8 = &.{};
 pub var bundle_files: []const u8 = &.{};
 
 pub export var user_scheduler: *UserScheduler = undefined;
 pub export var driver: *align(lib.arch.valid_page_sizes[0]) Driver = undefined;
+pub export var heap = Heap{};
+pub var debug_info: lib.ModuleDebugInfo = undefined;
 pub export var page_tables: CPUPageTables = undefined;
 pub var file: []align(lib.default_sector_size) const u8 = undefined;
 pub export var core_id: u32 = 0;
@@ -66,11 +57,15 @@ pub const Driver = extern struct {
 
 /// This data structure holds the information needed to run a program in a core (cpu side)
 pub const UserScheduler = extern struct {
-    capability_root_node: capabilities.Root,
-    common: *birth.UserScheduler,
+    s: S,
     padding: [padding_byte_count]u8 = .{0} ** padding_byte_count,
 
-    const total_size = @sizeOf(capabilities.Root) + @sizeOf(*birth.UserScheduler);
+    const S = extern struct {
+        capability_root_node: capabilities.Root,
+        common: *birth.UserScheduler,
+    };
+
+    const total_size = @sizeOf(S);
     const aligned_size = lib.alignForward(usize, total_size, lib.arch.valid_page_sizes[0]);
     const padding_byte_count = aligned_size - total_size;
 
@@ -92,9 +87,9 @@ inline fn panicPrologue(comptime format: []const u8, arguments: anytype) !void {
     try writer.writeAll(lib.Color.get(.bold));
     try writer.writeAll(lib.Color.get(.red));
     try writer.writeAll("[CPU DRIVER] [PANIC] ");
-    try writer.writeAll(lib.Color.get(.reset));
     try writer.print(format, arguments);
     try writer.writeByte('\n');
+    try writer.writeAll(lib.Color.get(.reset));
 }
 
 inline fn panicEpilogue() noreturn {
@@ -168,6 +163,7 @@ pub fn panic(comptime format: []const u8, arguments: anytype) noreturn {
     @call(.always_inline, panicFromInstructionPointerAndFramePointer, .{ @returnAddress(), @frameAddress(), format, arguments });
 }
 
+pub var command_count: usize = 0;
 pub var syscall_count: usize = 0;
 
 pub inline fn shutdown(exit_code: lib.QEMU.ExitCode) noreturn {
@@ -177,250 +173,147 @@ pub inline fn shutdown(exit_code: lib.QEMU.ExitCode) noreturn {
     privileged.shutdown(exit_code);
 }
 
-pub const PageAllocator = extern struct {
-    head: ?*Entry,
-    list_allocator: ListAllocator,
-    total_allocated_size: u32 = 0,
-
-    fn getPageAllocatorInterface(pa: *PageAllocator) PageAllocatorInterface {
-        return .{
+/// This is only meant to be used by the CPU driver
+const Heap = extern struct {
+    allocator: lib.Allocator = .{
+        .callbacks = .{
             .allocate = callbackAllocate,
-            .context = pa,
-            .context_type = .cpu,
-        };
-    }
-
-    fn callbackAllocate(context: ?*anyopaque, size: u64, alignment: u64, options: PageAllocatorInterface.AllocateOptions) Allocator.Allocate.Error!PhysicalMemoryRegion {
-        _ = options;
-        const pa = @as(?*PageAllocator, @ptrCast(@alignCast(context))) orelse return Allocator.Allocate.Error.OutOfMemory;
-        const result = try pa.allocate(size, alignment);
-        return result;
-    }
-
-    pub fn allocate(pa: *PageAllocator, size: u64, alignment: u64) Allocator.Allocate.Error!PhysicalMemoryRegion {
-        if (pa.head == null) {
-            @panic("head null");
-        }
-
-        const allocation = blk: {
-            var ptr = pa.head;
-            while (ptr) |entry| : (ptr = entry.next) {
-                if (lib.isAligned(entry.region.address.value(), alignment) and entry.region.size > size) {
-                    const result = PhysicalMemoryRegion{
-                        .address = entry.region.address,
-                        .size = size,
-                    };
-                    entry.region.address = entry.region.address.offset(size);
-                    entry.region.size -= size;
-
-                    pa.total_allocated_size += @as(u32, @intCast(size));
-                    // log.debug("Allocated 0x{x}", .{size});
-
-                    break :blk result;
-                }
-            }
-
-            ptr = pa.head;
-
-            while (ptr) |entry| : (ptr = entry.next) {
-                const aligned_address = lib.alignForward(entry.region.address.value(), alignment);
-                const top = entry.region.top().value();
-                if (aligned_address < top and top - aligned_address > size) {
-                    // log.debug("Found region which we should be splitting: (0x{x}, 0x{x})", .{ entry.region.address.value(), entry.region.size });
-                    // log.debug("User asked for 0x{x} bytes with alignment 0x{x}", .{ size, alignment });
-                    // Split the addresses to obtain the desired result
-                    const first_region_size = aligned_address - entry.region.address.value();
-                    const first_region_address = entry.region.address;
-                    const first_region_next = entry.next;
-
-                    const second_region_address = aligned_address + size;
-                    const second_region_size = top - aligned_address + size;
-
-                    const result = PhysicalMemoryRegion{
-                        .address = PhysicalAddress.new(aligned_address),
-                        .size = size,
-                    };
-
-                    // log.debug("\nFirst region: (Address: 0x{x}. Size: 0x{x}).\nRegion in the middle (allocated): (Address: 0x{x}. Size: 0x{x}).\nSecond region: (Address: 0x{x}. Size: 0x{x})", .{ first_region_address, first_region_size, result.address.value(), result.size, second_region_address, second_region_size });
-
-                    const new_entry = pa.list_allocator.get();
-                    entry.* = .{
-                        .region = .{
-                            .address = first_region_address,
-                            .size = first_region_size,
-                        },
-                        .next = new_entry,
-                    };
-
-                    new_entry.* = .{
-                        .region = .{
-                            .address = PhysicalAddress.new(second_region_address),
-                            .size = second_region_size,
-                        },
-                        .next = first_region_next,
-                    };
-                    // log.debug("First entry: (Address: 0x{x}. Size: 0x{x})", .{ entry.region.address.value(), entry.region.size });
-                    // log.debug("Second entry: (Address: 0x{x}. Size: 0x{x})", .{ new_entry.region.address.value(), new_entry.region.size });
-
-                    // pa.total_allocated_size += @intCast(u32, size);
-                    // log.debug("Allocated 0x{x}", .{size});
-
-                    break :blk result;
-                }
-            }
-
-            log.err("Allocate error. Size: 0x{x}. Alignment: 0x{x}. Total allocated size: 0x{x}", .{ size, alignment, pa.total_allocated_size });
-            return Allocator.Allocate.Error.OutOfMemory;
-        };
-
-        //log.debug("Physical allocation: 0x{x}, 0x{x}", .{ allocation.address.value(), allocation.size });
-
-        @memset(allocation.toHigherHalfVirtualAddress().access(u8), 0);
-
-        return allocation;
-    }
-
-    pub inline fn fromBSP(bootloader_information: *bootloader.Information) InitializationError!PageAllocator {
-        const memory_map_entries = bootloader_information.getMemoryMapEntries();
-        const page_counters = bootloader_information.getPageCounters();
-
-        var total_size: usize = 0;
-        const page_shifter = lib.arch.page_shifter(lib.arch.valid_page_sizes[0]);
-
-        for (memory_map_entries, page_counters) |entry, page_counter| {
-            if (entry.type != .usable or !lib.isAligned(entry.region.size, lib.arch.valid_page_sizes[0]) or entry.region.address.value() < lib.mb) {
-                continue;
-            }
-
-            total_size += entry.region.size - (page_counter << page_shifter);
-        }
-
-        const cpu_count = bootloader_information.smp.cpu_count;
-        const total_memory_to_take = total_size / cpu_count;
-
-        // Look for a 4K page to host the memory map
-        const backing_4k_page = for (memory_map_entries, page_counters) |entry, *page_counter| {
-            const occupied_size = page_counter.* << page_shifter;
-            const entry_size_left = entry.region.size - occupied_size;
-            if (entry_size_left != 0) {
-                if (entry.type != .usable or !lib.isAligned(entry.region.size, lib.arch.valid_page_sizes[0]) or entry.region.address.value() < lib.mb) continue;
-
-                assert(lib.isAligned(entry_size_left, lib.arch.valid_page_sizes[0]));
-                page_counter.* += 1;
-                break entry.region.address.offset(occupied_size);
-            }
-        } else return InitializationError.bootstrap_region_not_found;
-
-        var memory_taken: usize = 0;
-        var backing_4k_page_memory_allocated: usize = 0;
-
-        var last_entry: ?*Entry = null;
-        var first_entry: ?*Entry = null;
-
-        for (memory_map_entries, page_counters) |entry, *page_counter| {
-            if (entry.type != .usable or !lib.isAligned(entry.region.size, lib.arch.valid_page_sizes[0]) or entry.region.address.value() < lib.mb) continue;
-
-            const occupied_size = page_counter.* << page_shifter;
-
-            if (occupied_size < entry.region.size) {
-                const entry_size_left = entry.region.size - occupied_size;
-
-                var memory_taken_from_region: usize = 0;
-                while (memory_taken + memory_taken_from_region < total_memory_to_take) {
-                    if (memory_taken_from_region == entry_size_left) break;
-
-                    const size_to_take = @min(2 * lib.mb, entry_size_left);
-                    memory_taken_from_region += size_to_take;
-                }
-
-                memory_taken += memory_taken_from_region;
-
-                page_counter.* += @as(u32, @intCast(memory_taken_from_region >> page_shifter));
-                const region_descriptor = .{
-                    .address = entry.region.offset(occupied_size).address,
-                    .size = memory_taken_from_region,
-                };
-
-                if (backing_4k_page_memory_allocated >= lib.arch.valid_page_sizes[0]) return InitializationError.memory_exceeded;
-                const entry_address = backing_4k_page.offset(backing_4k_page_memory_allocated);
-                const new_entry = entry_address.toHigherHalfVirtualAddress().access(*Entry);
-                backing_4k_page_memory_allocated += @sizeOf(Entry);
-
-                new_entry.* = .{
-                    .region = .{
-                        .address = region_descriptor.address,
-                        .size = region_descriptor.size,
-                    },
-                    .next = null,
-                };
-
-                if (last_entry) |e| {
-                    e.next = new_entry;
-                } else {
-                    first_entry = new_entry;
-                }
-
-                last_entry = new_entry;
-
-                if (memory_taken >= total_memory_to_take) break;
-            }
-        }
-
-        const result = .{
-            .head = first_entry,
-            .list_allocator = .{
-                .u = .{
-                    .primitive = .{
-                        .backing_4k_page = backing_4k_page,
-                        .allocated = backing_4k_page_memory_allocated,
-                    },
-                },
-                .primitive = true,
-            },
-        };
-
-        return result;
-    }
-
-    const ListAllocator = extern struct {
-        u: extern union {
-            primitive: extern struct {
-                backing_4k_page: PhysicalAddress,
-                allocated: u64,
-            },
-            normal: extern struct {
-                foo: u64,
-            },
         },
-        primitive: bool,
+    },
+    regions: ?*Region = null,
+    region_heap: ?*Region = null,
+    liberated_regions: ?*Region = null,
 
-        pub fn get(list_allocator: *ListAllocator) *Entry {
-            switch (list_allocator.primitive) {
-                true => {
-                    if (list_allocator.u.primitive.allocated < 0x1000) {
-                        const result = list_allocator.u.primitive.backing_4k_page.offset(list_allocator.u.primitive.allocated).toHigherHalfVirtualAddress().access(*Entry);
-                        list_allocator.u.primitive.backing_4k_page = list_allocator.u.primitive.backing_4k_page.offset(@sizeOf(Entry));
-                        return result;
+    const Region = extern struct {
+        region: VirtualMemoryRegion,
+        previous: ?*Region = null,
+        next: ?*Region = null,
+    };
+
+    pub fn create(heap_allocator: *Heap, comptime T: type) lib.Allocator.Allocate.Error!*T {
+        const result = try heap_allocator.allocate(@sizeOf(T), @alignOf(T));
+        return @ptrFromInt(result.address);
+    }
+
+    // TODO: turn the other way around: make the callback call this function
+    pub fn allocate(heap_allocator: *Heap, size: u64, alignment: u64) lib.Allocator.Allocate.Error!lib.Allocator.Allocate.Result {
+        return heap_allocator.allocator.callbacks.allocate(&heap_allocator.allocator, size, alignment);
+    }
+
+    fn callbackAllocate(allocator: *Allocator, size: u64, alignment: u64) lib.Allocator.Allocate.Error!lib.Allocator.Allocate.Result {
+        // This assert is triggered by the Zig std library
+        //assert(lib.isAligned(size, alignment));
+        const heap_allocator = @fieldParentPtr(Heap, "allocator", allocator);
+        var iterator = heap_allocator.regions;
+
+        while (iterator) |region| : (iterator = region.next) {
+            if (lib.isAligned(region.region.address.value(), alignment)) {
+                if (region.region.size > size) {
+                    const virtual_region = region.region.takeSlice(size) catch return error.OutOfMemory;
+                    return .{
+                        .address = virtual_region.address.value(),
+                        .size = virtual_region.size,
+                    };
+                } else if (region.region.size == size) {
+                    const result = .{
+                        .address = region.region.address.value(),
+                        .size = region.region.size,
+                    };
+                    region.previous.?.next = region.next;
+
+                    region.* = lib.zeroes(Region);
+
+                    if (heap_allocator.liberated_regions) |_| {
+                        var inner_iterator = heap_allocator.liberated_regions;
+                        while (inner_iterator) |inner_region| : (inner_iterator = inner_region.next) {
+                            if (inner_region.next == null) {
+                                inner_region.next = region;
+                                region.previous = inner_region;
+                                break;
+                            }
+                        }
                     } else {
-                        @panic("reached limit");
+                        heap_allocator.liberated_regions = region;
                     }
-                },
-                false => {
-                    @panic("not primitive allocator not implemented");
-                },
+
+                    return result;
+                } else {
+                    continue;
+                }
+            }
+            // TODO: else
+            // Contemplate options to split the region to satisfy alignment
+        } else {
+            const total_size = lib.alignForward(u64, size, @max(alignment, lib.arch.valid_page_sizes[0]));
+            const physical_region = try driver.getRootCapability().allocateRAMPrivileged(total_size);
+            const virtual_region = physical_region.toHigherHalfVirtualAddress();
+
+            if (virtual_region.size > size) {
+                const new_region = nr: {
+                    var region_heap_iterator: ?*Region = heap_allocator.region_heap;
+                    while (region_heap_iterator) |region| : (region_heap_iterator = region.next) {
+                        if (region.region.size > @sizeOf(Region)) {
+                            @panic("TODO: fits");
+                        } else if (region.region.size == @sizeOf(Region)) {
+                            @panic("TODO: fits exactly");
+                        } else {
+                            continue;
+                        }
+
+                        break :nr undefined;
+                    } else {
+                        const physical_heap_region = try driver.getRootCapability().allocateRAMPrivileged(lib.arch.valid_page_sizes[0]);
+                        var virtual_heap_region = physical_heap_region.toHigherHalfVirtualAddress();
+                        const virtual_region_for_this_region = virtual_heap_region.takeSlice(@sizeOf(Region)) catch return error.OutOfMemory;
+                        const this_region = virtual_region_for_this_region.address.access(*Region);
+                        const virtual_region_for_new_region = virtual_heap_region.takeSlice(@sizeOf(Region)) catch return error.OutOfMemory;
+                        const new_region = virtual_region_for_new_region.address.access(*Region);
+                        new_region.* = .{
+                            .region = undefined,
+                            .previous = this_region,
+                        };
+                        this_region.* = .{
+                            .region = virtual_heap_region,
+                            .next = new_region,
+                        };
+
+                        var region_iterator = heap.regions;
+                        if (region_iterator) |_| {
+                            while (region_iterator) |region| : (region_iterator = region.next) {
+                                if (region.next == null) {
+                                    region.next = this_region;
+                                    this_region.previous = region;
+                                    break;
+                                }
+                            }
+                        } else {
+                            heap.regions = this_region;
+                        }
+
+                        break :nr new_region;
+                    }
+                };
+
+                var region_slicer = virtual_region;
+                const real_virtual_region = region_slicer.takeSlice(size) catch return error.OutOfMemory;
+                const result = .{
+                    .address = real_virtual_region.address.value(),
+                    .size = real_virtual_region.size,
+                };
+                new_region.region = region_slicer;
+
+                return result;
+            } else {
+                // TODO: register this allocation somehow
+                return .{
+                    .address = virtual_region.address.value(),
+                    .size = virtual_region.size,
+                };
             }
         }
-    };
 
-    pub const Entry = extern struct {
-        region: PhysicalMemoryRegion,
-        next: ?*Entry,
-    };
-
-    const InitializationError = error{
-        bootstrap_region_not_found,
-        memory_exceeded,
-    };
+        @panic("TODO: callbackAllocate");
+    }
 };
 
 // fn getDebugInformation() !lib.ModuleDebugInfo {

src/cpu/arch/x86/64/init.zig

@@ -46,8 +46,6 @@ pub fn entryPoint() callconv(.Naked) noreturn {
           [main] "{rax}" (&main),
         : "rsp", "rbp"
     );
-
-    unreachable;
 }
 
 const InitializationError = error{
@@ -297,46 +295,123 @@ fn initialize(bootloader_information: *bootloader.Information) !noreturn {
         }
     } else @panic("Total physical region not found");
 
-    var offset: usize = 0;
+    // Quick and dirty allocator to use only in this function
+    //
 
-    cpu.driver = total_physical.region.offset(offset).address.toHigherHalfVirtualAddress().access(*align(lib.arch.valid_page_sizes[0]) cpu.Driver);
-    offset += @sizeOf(cpu.Driver);
+    const allocations = blk: {
+        const RegionAllocator = extern struct {
+            region: PhysicalMemoryRegion,
+            offset: usize = 0,
 
-    const root_capability = total_physical.region.offset(offset).address.toHigherHalfVirtualAddress().access(*cpu.capabilities.Root);
-    offset += @sizeOf(cpu.capabilities.Root);
+            const Error = error{
+                OutOfMemory,
+                not_empty,
+                misalignment,
+            };
 
-    var heap_offset: usize = 0;
-    const heap_region = total_physical.region.offset(offset);
-    assert(heap_region.size == lib.arch.valid_page_sizes[0]);
-    const host_free_ram = heap_region.offset(heap_offset).address.toHigherHalfVirtualAddress().access(*cpu.capabilities.RAM.Region);
-    host_free_ram.* = .{
-        .region = PhysicalMemoryRegion.new(.{
-            .address = total_physical.region.offset(total_to_allocate).address,
-            .size = total_physical.free_size,
-        }),
-    };
-    heap_offset += @sizeOf(cpu.capabilities.RAM.Region);
-    const privileged_cpu_memory = heap_region.offset(heap_offset).address.toHigherHalfVirtualAddress().access(*cpu.capabilities.RAM.Region);
-    privileged_cpu_memory.* = .{
-        .region = total_physical.region,
+            fn allocate(allocator: *@This(), comptime T: type) Error!*T {
+                return allocator.allocateAligned(T, null);
+            }
+
+            fn allocateAligned(allocator: *@This(), comptime T: type, comptime maybe_alignment: ?u29) Error!if (maybe_alignment) |alignment| *align(alignment) T else *T {
+                const alignment = maybe_alignment orelse @alignOf(T);
+                if (!lib.isAligned(allocator.offset, alignment)) {
+                    log.err("Allocator offset not aligned to demanded alignment: 0x{x}", .{allocator.offset});
+                    return Error.misalignment;
+                }
+
+                const physical_allocation = try allocator.allocatePhysical(@sizeOf(T));
+                return physical_allocation.address.toHigherHalfVirtualAddress().access(*align(alignment) T);
+            }
+
+            fn allocatePhysical(allocator: *@This(), size: usize) Error!PhysicalMemoryRegion {
+                if (!lib.isAligned(allocator.offset, lib.arch.valid_page_sizes[0])) {
+                    log.err("Allocator offset not page-aligned: 0x{x}", .{allocator.offset});
+                    return Error.misalignment;
+                }
+                if (!lib.isAligned(size, lib.arch.valid_page_sizes[0])) {
+                    log.err("Size not page-aligned: 0x{x}", .{size});
+                    return Error.misalignment;
+                }
+
+                var left_region = allocator.region.offset(allocator.offset);
+                allocator.offset += size;
+                return left_region.takeSlice(size) catch {
+                    log.err("takeSlice", .{});
+                    return Error.OutOfMemory;
+                };
+            }
+        };
+        var region_allocator = RegionAllocator{
+            .region = total_physical.region,
+        };
+        cpu.driver = try region_allocator.allocateAligned(cpu.Driver, lib.arch.valid_page_sizes[0]);
+        const root_capability = try region_allocator.allocate(cpu.capabilities.Root);
+        const heap_region = try region_allocator.allocatePhysical(lib.arch.valid_page_sizes[0]);
+
+        break :blk .{
+            .heap_region = heap_region,
+            .root_capability = root_capability,
+        };
     };
 
-    heap_offset += @sizeOf(cpu.capabilities.RAM);
+    const root_capability = allocations.root_capability;
+    const heap_region = allocations.heap_region;
+
+    const HeapAllocator = extern struct {
+        region: VirtualMemoryRegion,
+        offset: usize = 0,
+
+        const Error = error{
+            misalignment,
+            no_space,
+        };
+
+        fn allocate(allocator: *@This(), comptime T: type) Error!*T {
+            const alignment = @alignOf(T);
+            const size = @sizeOf(T);
+
+            if (!lib.isAligned(allocator.offset, alignment)) {
+                return Error.misalignment;
+            }
+
+            if (allocator.region.size - allocator.offset < size) {
+                log.err("Region size: 0x{x}. Allocator offset: 0x{x}. Size: 0x{x}", .{ allocator.region.size, allocator.offset, size });
+                return Error.no_space;
+            }
+
+            const result = allocator.region.offset(allocator.offset).address.access(*T);
+            return result;
+        }
+    };
+
+    var heap_allocator = HeapAllocator{
+        .region = heap_region.toHigherHalfVirtualAddress(),
+    };
+    const host_free_region_list = try heap_allocator.allocate(cpu.capabilities.RegionList);
+
+    log.err("PHYSICAL MAP START", .{});
+
+    _ = try host_free_region_list.append(PhysicalMemoryRegion.new(.{
+        .address = total_physical.region.offset(total_to_allocate).address,
+        .size = total_physical.free_size,
+    }));
+
+    var region_list_iterator = host_free_region_list;
 
-    var previous_free_ram = host_free_ram;
     for (memory_map_entries, page_counters, 0..) |memory_map_entry, page_counter, index| {
         if (index == total_physical.index) continue;
 
         if (memory_map_entry.type == .usable) {
             const region = memory_map_entry.getFreeRegion(page_counter);
             if (region.size > 0) {
-                const new_free_ram = heap_region.offset(heap_offset).address.toHigherHalfVirtualAddress().access(*cpu.capabilities.RAM.Region);
-                heap_offset += @sizeOf(cpu.capabilities.RAM.Region);
-                new_free_ram.* = .{
-                    .region = region,
+                _ = region_list_iterator.append(region) catch {
+                    const new_region_list = try heap_allocator.allocate(cpu.capabilities.RegionList);
+                    region_list_iterator.metadata.next = new_region_list;
+                    new_region_list.metadata.previous = region_list_iterator;
+                    region_list_iterator = new_region_list;
+                    _ = try region_list_iterator.append(region);
                 };
-                previous_free_ram.next = new_free_ram;
-                previous_free_ram = new_free_ram;
             }
         }
     }
@@ -353,29 +428,26 @@ fn initialize(bootloader_information: *bootloader.Information) !noreturn {
             },
             .ram = .{
                 .lists = blk: {
-                    var lists = [1]?*cpu.capabilities.RAM.Region{null} ** lib.arch.reverse_valid_page_sizes.len;
-                    var free_ram_iterator: ?*cpu.capabilities.RAM.Region = host_free_ram;
-                    while (free_ram_iterator) |free_ram| {
-                        comptime assert(lib.arch.reverse_valid_page_sizes.len == 3);
-                        const next = free_ram.next;
+                    var lists = [1]cpu.capabilities.RegionList{.{}} ** lib.arch.reverse_valid_page_sizes.len;
+                    var list_iterator: ?*cpu.capabilities.RegionList = host_free_region_list;
 
-                        if (free_ram.region.size >= lib.arch.reverse_valid_page_sizes[0]) {
-                            const previous_first = lists[0];
-                            lists[0] = free_ram;
-                            free_ram.next = previous_first;
-                        } else if (free_ram.region.size >= lib.arch.reverse_valid_page_sizes[1]) {
-                            const previous_first = lists[1];
-                            lists[1] = free_ram;
-                            free_ram.next = previous_first;
-                        } else if (free_ram.region.size >= lib.arch.reverse_valid_page_sizes[2]) {
-                            const previous_first = lists[2];
-                            lists[2] = free_ram;
-                            free_ram.next = previous_first;
-                        } else unreachable;
-
-                        free_ram_iterator = next;
+                    while (list_iterator) |list| : (list_iterator = list.metadata.next) {
+                        for (list.getRegions()) |region| {
+                            // TODO: make this with inline for if possible
+                            comptime assert(lib.arch.reverse_valid_page_sizes.len == 3);
+                            const index: usize = if (region.size >= lib.arch.reverse_valid_page_sizes[0]) 0 else if (region.size >= lib.arch.reverse_valid_page_sizes[1]) 1 else if (region.size >= lib.arch.reverse_valid_page_sizes[2]) 2 else unreachable;
+                            _ = try lists[index].append(region);
+                        }
                     }
 
+                    var total_region_count: usize = 0;
+
+                    for (&lists) |*list| {
+                        total_region_count += list.metadata.count;
+                    }
+
+                    assert(total_region_count > 0);
+
                     break :blk lists;
                 },
             },
@@ -389,9 +461,22 @@ fn initialize(bootloader_information: *bootloader.Information) !noreturn {
         .scheduler = .{
             .memory = undefined,
         },
-        .heap = cpu.capabilities.Root.Heap.new(heap_region, heap_offset),
+        .heap = cpu.capabilities.Root.Heap.new(heap_region, heap_allocator.offset),
     };
 
+    if (@intFromPtr(root_capability) == @intFromPtr(cpu.driver)) {
+        @panic("WTF: addresses match");
+    }
+
+    {
+        var assertion_count: usize = 0;
+        for (root_capability.dynamic.ram.lists) |list| {
+            assertion_count += list.metadata.count;
+        }
+
+        assert(assertion_count > 0);
+    }
+
     cpu.driver.* = .{
         .valid = true,
         .init_root_capability = .{
@@ -399,9 +484,25 @@ fn initialize(bootloader_information: *bootloader.Information) !noreturn {
         },
     };
 
+    {
+        var assertion_count: usize = 0;
+        for (root_capability.dynamic.ram.lists) |list| {
+            assertion_count += list.metadata.count;
+        }
+
+        assert(assertion_count > 0);
+    }
+
+    log.err("PHYSICAL MAP END", .{});
+
     switch (cpu.bsp) {
         true => {
             const init_module_descriptor = try bootloader_information.getFileDescriptor("init");
+            const cpu_driver_executable_descriptor = try bootloader_information.getFileDescriptor("cpu_driver");
+            const elf_file_allocation = try cpu.heap.allocate(lib.alignForward(usize, cpu_driver_executable_descriptor.content.len, lib.arch.valid_page_sizes[0]), lib.arch.valid_page_sizes[0]);
+            const elf_file = @as([*]align(lib.arch.valid_page_sizes[0]) u8, @ptrFromInt(elf_file_allocation.address))[0..elf_file_allocation.size];
+            @memcpy(elf_file[0..cpu_driver_executable_descriptor.content.len], cpu_driver_executable_descriptor.content);
+            cpu.debug_info = try lib.getDebugInformation(cpu.heap.allocator.zigUnwrap(), elf_file);
             try spawnInitBSP(init_module_descriptor.content, bootloader_information.cpu_page_tables);
         },
         false => @panic("Implement APP"),
@@ -490,8 +591,6 @@ pub fn InterruptHandler(comptime interrupt_number: u64, comptime has_error_code:
                 \\iretq
                 \\int3
                 ::: "memory");
-
-            unreachable;
         }
     }.handler;
 }
@@ -779,105 +878,6 @@ const interrupt_handlers = [256]*const fn () callconv(.Naked) noreturn{
     InterruptHandler(0xff, false),
 };
 
-const BSPEarlyAllocator = extern struct {
-    base: PhysicalAddress,
-    size: usize,
-    offset: usize,
-    allocator: Allocator = .{
-        .callbacks = .{
-            .allocate = callbackAllocate,
-        },
-    },
-    heap_first: ?*BSPHeapEntry = null,
-
-    const BSPHeapEntry = extern struct {
-        virtual_memory_region: VirtualMemoryRegion,
-        offset: usize = 0,
-        next: ?*BSPHeapEntry = null,
-
-        // pub fn create(heap: *BSPHeapEntry, comptime T: type) !*T {
-        //     _ = heap;
-        //     @panic("TODO: create");
-        // }
-
-        pub fn allocateBytes(heap: *BSPHeapEntry, size: u64, alignment: u64) ![]u8 {
-            assert(alignment < lib.arch.valid_page_sizes[0]);
-            assert(heap.virtual_memory_region.size > size);
-            if (!lib.isAligned(heap.virtual_memory_region.address.value(), alignment)) {
-                const misalignment = lib.alignForward(usize, heap.virtual_memory_region.address.value(), alignment) - heap.virtual_memory_region.address.value();
-                _ = heap.virtual_memory_region.takeSlice(misalignment);
-            }
-
-            return heap.virtual_memory_region.takeByteSlice(size);
-        }
-    };
-
-    pub fn createPageAligned(allocator: *BSPEarlyAllocator, comptime T: type) AllocatorError!*align(lib.arch.valid_page_sizes[0]) T {
-        return @as(*align(lib.arch.valid_page_sizes[0]) T, @ptrCast(try allocator.allocateBytes(@sizeOf(T), lib.arch.valid_page_sizes[0])));
-    }
-
-    pub fn allocateBytes(allocator: *BSPEarlyAllocator, size: u64, alignment: u64) AllocatorError![]align(lib.arch.valid_page_sizes[0]) u8 {
-        if (!lib.isAligned(size, lib.arch.valid_page_sizes[0])) return AllocatorError.bad_alignment;
-        if (allocator.offset + size > allocator.size) return AllocatorError.out_of_memory;
-
-        // TODO: don't trash memory
-        if (!lib.isAligned(allocator.base.offset(allocator.offset).value(), alignment)) {
-            const aligned = lib.alignForward(usize, allocator.base.offset(allocator.offset).value(), alignment);
-            allocator.offset += aligned - allocator.base.offset(allocator.offset).value();
-        }
-
-        const physical_address = allocator.base.offset(allocator.offset);
-        allocator.offset += size;
-        const slice = physical_address.toHigherHalfVirtualAddress().access([*]align(lib.arch.valid_page_sizes[0]) u8)[0..size];
-        @memset(slice, 0);
-
-        return slice;
-    }
-
-    pub fn callbackAllocate(allocator: *Allocator, size: u64, alignment: u64) Allocator.Allocate.Error!Allocator.Allocate.Result {
-        const early_allocator = @fieldParentPtr(BSPEarlyAllocator, "allocator", allocator);
-        if (alignment == lib.arch.valid_page_sizes[0] or size % lib.arch.valid_page_sizes[0] == 0) {
-            const result = early_allocator.allocateBytes(size, alignment) catch return Allocator.Allocate.Error.OutOfMemory;
-            return .{
-                .address = @intFromPtr(result.ptr),
-                .size = result.len,
-            };
-        } else if (alignment > lib.arch.valid_page_sizes[0]) {
-            @panic("WTF");
-        } else {
-            assert(size < lib.arch.valid_page_sizes[0]);
-            const heap_entry_allocation = early_allocator.allocateBytes(lib.arch.valid_page_sizes[0], lib.arch.valid_page_sizes[0]) catch return Allocator.Allocate.Error.OutOfMemory;
-            const heap_entry_region = VirtualMemoryRegion.fromByteSlice(.{
-                .slice = heap_entry_allocation,
-            });
-            const heap_entry = try early_allocator.addHeapRegion(heap_entry_region);
-            const result = try heap_entry.allocateBytes(size, alignment);
-            return .{
-                .address = @intFromPtr(result.ptr),
-                .size = result.len,
-            };
-        }
-    }
-
-    inline fn addHeapRegion(early_allocator: *BSPEarlyAllocator, region: VirtualMemoryRegion) !*BSPHeapEntry {
-        const heap_entry = region.address.access(*BSPHeapEntry);
-        const offset = @sizeOf(BSPHeapEntry);
-        heap_entry.* = .{
-            .offset = offset,
-            .virtual_memory_region = region.offset(offset),
-            .next = early_allocator.heap_first,
-        };
-
-        early_allocator.heap_first = heap_entry;
-
-        return heap_entry;
-    }
-    const AllocatorError = error{
-        out_of_memory,
-        bad_alignment,
-    };
-};
-
 const half_page_table_entry_count = @divExact(paging.page_table_entry_count, 2);
 
 fn spawnInitBSP(init_file: []const u8, cpu_page_tables: paging.CPUPageTables) !noreturn {
@@ -890,7 +890,7 @@ fn spawnInitBSP(init_file: []const u8, cpu_page_tables: paging.CPUPageTables) !n
     const init_elf = try ELF.Parser.init(init_file);
     const entry_point = init_elf.getEntryPoint();
     const program_headers = init_elf.getProgramHeaders();
-    const scheduler_common = init_scheduler.common;
+    const scheduler_common = init_scheduler.s.common;
 
     for (program_headers) |program_header| {
         if (program_header.type == .load) {
@@ -904,7 +904,7 @@ fn spawnInitBSP(init_file: []const u8, cpu_page_tables: paging.CPUPageTables) !n
                 .user = true,
             };
 
-            const segment_physical_region = try cpu.driver.getRootCapability().allocatePages(aligned_size);
+            const segment_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(aligned_size);
             try page_table_regions.map(segment_virtual_address, segment_physical_region.address, segment_physical_region.size, segment_flags);
 
             const src = init_file[program_header.offset..][0..program_header.size_in_file];
@@ -1129,6 +1129,14 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         const cpu_page_table_size = (paging.Level.count - 1) * paging.page_table_size;
         const allocation_size = page_table_regions_total_size + cpu_page_table_size;
         const allocation_alignment = 2 * paging.page_table_alignment;
+        {
+            var assertion_count: usize = 0;
+            for (cpu.driver.getRootCapability().dynamic.ram.lists) |list| {
+                assertion_count += list.metadata.count;
+            }
+
+            assert(assertion_count > 0);
+        }
         const total_region = try cpu.driver.getRootCapability().allocatePageCustomAlignment(allocation_size, allocation_alignment);
         //log.debug("Total region: (0x{x}, 0x{x})", .{ total_region.address.value(), total_region.top().value() });
         var region_slicer = total_region;
@@ -1139,7 +1147,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         };
 
         inline for (&page_table_regions.regions, 0..) |*region, index| {
-            region.* = region_slicer.takeSlice(PageTableRegions.sizes[index]);
+            region.* = try region_slicer.takeSlice(PageTableRegions.sizes[index]);
         }
 
         assert(lib.isAligned(page_table_regions.regions[0].address.value(), 2 * paging.page_table_alignment));
@@ -1195,7 +1203,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         };
     }
 
-    const scheduler_memory_physical_region = try cpu.driver.getRootCapability().allocatePages(scheduler_memory_size);
+    const scheduler_memory_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(scheduler_memory_size);
     const scheduler_memory_map_flags = .{
         .present = true,
         .write = true,
@@ -1236,9 +1244,9 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
     const src_half = (try current_address_space.getPML4TableUnchecked())[half_page_table_entry_count..][0..half_page_table_entry_count];
     @memcpy(root_page_tables[0].toHigherHalfVirtualAddress().access(paging.PML4TE)[half_page_table_entry_count..][0..half_page_table_entry_count], src_half);
 
-    const pdp = cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
-    const pd = cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
-    const pt = cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
+    const pdp = try cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
+    const pd = try cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
+    const pt = try cpu_page_table_physical_region_iterator.takeSlice(paging.page_table_size);
     assert(cpu_page_table_physical_region_iterator.size == 0);
 
     const pdp_table = pdp.toHigherHalfVirtualAddress().access(paging.PDPTE);
@@ -1298,7 +1306,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
     // log.debug("cpu indexed base: 0x{x}. top: 0x{x}", .{ @bitCast(u64, cpu_indexed_base), @bitCast(u64, cpu_indexed_top) });
 
     const support_page_table_count = @as(usize, support_pdp_table_count + support_pd_table_count + support_p_table_count);
-    const support_page_table_physical_region = try cpu.driver.getRootCapability().allocatePages(support_page_table_count * paging.page_table_size);
+    const support_page_table_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(support_page_table_count * paging.page_table_size);
     // log.debug("Support page tables: 0x{x} - 0x{x}", .{ support_page_table_physical_region.address.value(), support_page_table_physical_region.top().value() });
     // log.debug("PD table count: {}. P table count: {}", .{ support_pd_table_count, support_p_table_count });
 
@@ -1360,7 +1368,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
     }
 
     {
-        const privileged_stack_physical_region = try cpu.driver.getRootCapability().allocatePages(x86_64.capability_address_space_stack_size);
+        const privileged_stack_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(x86_64.capability_address_space_stack_size);
         const indexed_privileged_stack = @as(paging.IndexedVirtualAddress, @bitCast(x86_64.capability_address_space_stack_address.value()));
         const stack_last_page = x86_64.capability_address_space_stack_address.offset(x86_64.capability_address_space_stack_size - lib.arch.valid_page_sizes[0]);
         const indexed_privileged_stack_last_page = @as(paging.IndexedVirtualAddress, @bitCast(stack_last_page.value()));
@@ -1372,7 +1380,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
 
         const pdpte = &(try paging.accessPageTable(PhysicalAddress.new(paging.unpackAddress(pml4te)), *paging.PDPTable))[indexed_privileged_stack.PDP];
         assert(!pdpte.present);
-        const pd_table_physical_region = try cpu.driver.getRootCapability().allocatePages(paging.page_table_size);
+        const pd_table_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(paging.page_table_size);
         pdpte.* = paging.PDPTE{
             .present = true,
             .write = true,
@@ -1381,7 +1389,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
 
         const pdte = &(try paging.accessPageTable(PhysicalAddress.new(paging.unpackAddress(pdpte)), *paging.PDTable))[indexed_privileged_stack.PD];
         assert(!pdte.present);
-        const p_table_physical_region = try cpu.driver.getRootCapability().allocatePages(paging.page_table_size);
+        const p_table_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(paging.page_table_size);
         pdte.* = paging.PDTE{
             .present = true,
             .write = true,
@@ -1398,7 +1406,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         }
     }
 
-    const init_cpu_scheduler_physical_region = try cpu.driver.getRootCapability().allocatePages(@sizeOf(cpu.UserScheduler));
+    const init_cpu_scheduler_physical_region = try cpu.driver.getRootCapability().allocateRAMPrivileged(@sizeOf(cpu.UserScheduler));
     const init_cpu_scheduler_virtual_region = init_cpu_scheduler_physical_region.toHigherHalfVirtualAddress();
     const init_cpu_scheduler = init_cpu_scheduler_virtual_region.address.access(*cpu.UserScheduler);
     // log.debug("Init scheduler: 0x{x}", .{init_cpu_scheduler_virtual_region.address.value()});
@@ -1420,7 +1428,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         assert(scheduler_pdpte.present == pdp_is_inside);
 
         if (!scheduler_pdpte.present) {
-            const pdte_allocation = try cpu.driver.getRootCapability().allocatePages(paging.page_table_size);
+            const pdte_allocation = try cpu.driver.getRootCapability().allocateRAMPrivileged(paging.page_table_size);
             scheduler_pdpte.* = .{
                 .present = true,
                 .write = true,
@@ -1435,7 +1443,7 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
         const is_inside_cpu_page_table_limits = cpu_scheduler_indexed.PD >= cpu_indexed_base.PD and cpu_scheduler_indexed.PD <= cpu_indexed_top.PD;
         assert(is_inside_cpu_page_table_limits == scheduler_pdte.present);
         if (!scheduler_pdte.present) {
-            const pte_allocation = try cpu.driver.getRootCapability().allocatePages(paging.page_table_size);
+            const pte_allocation = try cpu.driver.getRootCapability().allocateRAMPrivileged(paging.page_table_size);
             scheduler_pdte.* = .{
                 .present = true,
                 .write = true,
@@ -1452,28 +1460,30 @@ fn spawnInitCommon(cpu_page_tables: paging.CPUPageTables) !SpawnInitCommonResult
     });
 
     init_cpu_scheduler.* = cpu.UserScheduler{
-        .common = user_scheduler_virtual_address.access(*birth.UserScheduler),
-        .capability_root_node = cpu.capabilities.Root{
-            .static = .{
-                .cpu = true,
-                .boot = true,
-                .process = true,
-            },
-            .dynamic = .{
-                .io = .{
-                    .debug = true,
+        .s = .{
+            .common = user_scheduler_virtual_address.access(*birth.UserScheduler),
+            .capability_root_node = cpu.capabilities.Root{
+                .static = .{
+                    .cpu = true,
+                    .boot = true,
+                    .process = true,
                 },
-                .ram = cpu.driver.getRootCapability().dynamic.ram,
-                .cpu_memory = .{
-                    .flags = .{
-                        .allocate = true,
+                .dynamic = .{
+                    .io = .{
+                        .debug = true,
                     },
+                    .ram = cpu.driver.getRootCapability().dynamic.ram,
+                    .cpu_memory = .{
+                        .flags = .{
+                            .allocate = true,
+                        },
+                    },
+                    .page_table = .{},
+                },
+                .scheduler = .{
+                    .handle = init_cpu_scheduler,
+                    .memory = scheduler_memory_physical_region,
                 },
-                .page_table = .{},
-            },
-            .scheduler = .{
-                .handle = init_cpu_scheduler,
-                .memory = scheduler_memory_physical_region,
             },
         },
     };

src/cpu/arch/x86/64/syscall.zig

@@ -24,76 +24,10 @@ const pcid_mask = 1 << pcid_bit;
 /// - R10: argument 3
 /// - R8:  argument 4
 /// - R9:  argument 5
-fn birthSyscall(comptime Syscall: type, raw_arguments: birth.syscall.Arguments) Syscall.ErrorSet.Error!Syscall.Result {
-    cpu.syscall_count += 1;
-    comptime assert(Syscall == birth.capabilities.Syscall(Syscall.capability, Syscall.command));
-    const capability: birth.capabilities.Type = Syscall.capability;
-    const command: birth.capabilities.Command(capability) = Syscall.command;
-    const arguments = try Syscall.toArguments(raw_arguments);
-
-    return if (cpu.user_scheduler.capability_root_node.hasPermissions(capability, command)) switch (capability) {
-        .io => switch (command) {
-            .copy, .mint, .retype, .delete, .revoke, .create => unreachable,
-            .log => blk: {
-                const message = arguments;
-                cpu.writer.writeAll(message) catch unreachable;
-                comptime assert(Syscall.Result == usize);
-                break :blk message.len;
-            },
-        },
-        .cpu => switch (command) {
-            .copy, .mint, .retype, .delete, .revoke, .create => unreachable,
-            .get_core_id => cpu.core_id,
-            .shutdown => cpu.shutdown(.success),
-            .get_command_buffer => {
-                const command_buffer = arguments;
-                _ = command_buffer;
-                @panic("TODO: get_command_buffer");
-            },
-        },
-        .cpu_memory => switch (command) {
-            .allocate => blk: {
-                comptime assert(@TypeOf(arguments) == usize);
-                const size = arguments;
-                const physical_region = try cpu.user_scheduler.capability_root_node.allocatePages(size);
-                try cpu.user_scheduler.capability_root_node.allocateCPUMemory(physical_region, .{ .privileged = false });
-                break :blk physical_region.address;
-            },
-            else => @panic(@tagName(command)),
-        },
-        .ram => unreachable,
-        .boot => switch (command) {
-            .get_bundle_size => cpu.bundle.len,
-            .get_bundle_file_list_size => cpu.bundle_files.len,
-            else => @panic(@tagName(command)),
-        },
-        .process => switch (command) {
-            .exit => switch (arguments) {
-                true => cpu.shutdown(.success),
-                false => cpu.panic("User process panicked", .{}),
-            },
-            else => @panic(@tagName(command)),
-        },
-        .page_table => @panic("TODO: page_table"),
-    } else error.forbidden;
-}
-
 export fn syscall(registers: *const Registers) callconv(.C) birth.syscall.Result {
     const options = @as(birth.syscall.Options, @bitCast(registers.syscall_number));
     const arguments = birth.syscall.Arguments{ registers.rdi, registers.rsi, registers.rdx, registers.r10, registers.r8, registers.r9 };
-
-    return switch (options.general.convention) {
-        .birth => switch (options.birth.type) {
-            inline else => |capability| switch (@as(birth.capabilities.Command(capability), @enumFromInt(options.birth.command))) {
-                inline else => |command| blk: {
-                    const Syscall = birth.capabilities.Syscall(capability, command);
-                    const result: Syscall.Result = birthSyscall(Syscall, arguments) catch |err| break :blk Syscall.errorToRaw(err);
-                    break :blk Syscall.resultToRaw(result);
-                },
-            },
-        },
-        .linux => @panic("linux syscall"),
-    };
+    return cpu.syscall.process(options, arguments);
 }
 
 /// SYSCALL documentation
@@ -107,7 +41,7 @@ export fn syscall(registers: *const Registers) callconv(.C) birth.syscall.Result
 /// - R10: argument 3
 /// - R8:  argument 4
 /// - R9:  argument 5
-pub fn entryPoint() callconv(.Naked) void {
+pub fn entryPoint() callconv(.Naked) noreturn {
     asm volatile (
         \\endbr64
         \\swapgs
@@ -252,8 +186,6 @@ pub fn entryPoint() callconv(.Naked) void {
     asm volatile (
         \\int3
         ::: "memory");
-
-    unreachable;
 }
 
 pub const Registers = extern struct {

src/cpu/capabilities.zig

@@ -10,6 +10,69 @@ const PhysicalMemoryRegion = lib.PhysicalMemoryRegion;
 const birth = @import("birth");
 const cpu = @import("cpu");
 
+pub fn processCommand(comptime Syscall: type, raw_arguments: birth.syscall.Arguments) Syscall.Error!Syscall.Result {
+    defer cpu.command_count += 1;
+    comptime assert(Syscall == birth.capabilities.Syscall(Syscall.capability, Syscall.command));
+    const capability: birth.capabilities.Type = Syscall.capability;
+    const command: birth.capabilities.Command(capability) = Syscall.command;
+    const arguments = try Syscall.toArguments(raw_arguments);
+
+    return if (cpu.user_scheduler.s.capability_root_node.hasPermissions(capability, command)) switch (capability) {
+        .io => switch (command) {
+            .copy, .mint, .retype, .delete, .revoke, .create => unreachable,
+            .log => blk: {
+                const message = arguments;
+                cpu.writer.writeAll(message) catch unreachable;
+                comptime assert(Syscall.Result == usize);
+                break :blk message.len;
+            },
+        },
+        .cpu => switch (command) {
+            .copy, .mint, .retype, .delete, .revoke, .create => unreachable,
+            .get_core_id => cpu.core_id,
+            .shutdown => cpu.shutdown(.success),
+            .get_command_buffer => {
+                const command_buffer = arguments;
+                _ = command_buffer;
+                @panic("TODO: get_command_buffer");
+            },
+        },
+        .cpu_memory => switch (command) {
+            // .allocate => blk: {
+            //     comptime assert(@TypeOf(arguments) == usize);
+            //     const size = arguments;
+            //     const physical_region = try cpu.user_scheduler.s.capability_root_node.allocatePages(size);
+            //     try cpu.user_scheduler.s.capability_root_node.allocateCPUMemory(physical_region, .{ .privileged = false });
+            //     break :blk physical_region.address;
+            // },
+            else => @panic(@tagName(command)),
+        },
+        .ram => switch (command) {
+            .allocate => blk: {
+                comptime assert(@TypeOf(arguments) == usize);
+                const size = arguments;
+                const ref = try cpu.driver.getRootCapability().allocateRAM(size);
+                break :blk @bitCast(ref);
+            },
+            else => @panic(@tagName(command)),
+        },
+        .boot => switch (command) {
+            .get_bundle_size => cpu.bundle.len,
+            .get_bundle_file_list_size => cpu.bundle_files.len,
+            else => @panic(@tagName(command)),
+        },
+        .process => switch (command) {
+            .exit => cpu.shutdown(switch (arguments) {
+                true => .success,
+                false => .failure,
+            }),
+            .panic => cpu.panic("User process panicked with exit code 0x{x}: {s}", .{ arguments.exit_code, arguments.message }),
+            else => @panic(@tagName(command)),
+        },
+        .page_table => @panic("TODO: page_table"),
+    } else error.forbidden;
+}
+
 pub const RootDescriptor = extern struct {
     value: *Root,
 };
@@ -83,8 +146,118 @@ pub const Dynamic = enum {
     };
 };
 
+pub const RegionList = extern struct {
+    regions: [list_region_count]PhysicalMemoryRegion = [1]PhysicalMemoryRegion{PhysicalMemoryRegion.invalid()} ** list_region_count,
+    metadata: Metadata = .{},
+
+    pub const Metadata = extern struct {
+        count: usize = 0,
+        reserved: usize = 0,
+        previous: ?*RegionList = null,
+        next: ?*RegionList = null,
+    };
+
+    const Error = error{
+        OutOfMemory,
+        no_space,
+        misalignment_page_size,
+    };
+
+    pub fn getRegions(list: *const RegionList) []const PhysicalMemoryRegion {
+        return list.regions[0..list.metadata.count];
+    }
+
+    pub fn allocateAligned(list: *RegionList, size: usize, alignment: usize) Error!PhysicalMemoryRegion {
+        assert(alignment % lib.arch.valid_page_sizes[0] == 0);
+        const regions = list.regions[0..list.metadata.count];
+
+        for (regions, 0..) |*region, index| {
+            assert(region.size % lib.arch.valid_page_sizes[0] == 0);
+            assert(region.address.value() % lib.arch.valid_page_sizes[0] == 0);
+
+            if (lib.isAligned(region.address.value(), alignment)) {
+                if (region.size >= size) {
+                    const result = region.takeSlice(size) catch unreachable;
+                    if (region.size == 0) {
+                        if (index != regions.len - 1) {
+                            regions[index] = regions[regions.len - 1];
+                        }
+
+                        list.metadata.count -= 1;
+                    }
+
+                    return result;
+                }
+            }
+        }
+
+        return Error.OutOfMemory;
+    }
+
+    pub const UnalignedAllocationResult = extern struct {
+        wasted: PhysicalMemoryRegion,
+        allocated: PhysicalMemoryRegion,
+    };
+
+    /// Slow path
+    pub fn allocateAlignedSplitting(list: *RegionList, size: usize, alignment: usize) !UnalignedAllocationResult {
+        const regions = list.regions[0..list.metadata.count];
+
+        for (regions) |*region| {
+            const aligned_region_address = lib.alignForward(usize, region.address.value(), alignment);
+            const wasted_space = aligned_region_address - region.address.value();
+
+            if (region.size >= wasted_space + size) {
+                const wasted_region = try region.takeSlice(wasted_space);
+                const allocated_region = try region.takeSlice(size);
+
+                return UnalignedAllocationResult{
+                    .wasted = wasted_region,
+                    .allocated = allocated_region,
+                };
+            }
+        }
+
+        log.err("allocateAlignedSplitting", .{});
+        return error.OutOfMemory;
+    }
+
+    pub fn allocate(list: *RegionList, size: usize) Error!PhysicalMemoryRegion {
+        return list.allocateAligned(size, lib.arch.valid_page_sizes[0]);
+    }
+
+    pub fn append(list: *RegionList, region: PhysicalMemoryRegion) Error!birth.capabilities.RAM {
+        var block_count: usize = 0;
+        while (true) : (block_count += 1) {
+            if (list.metadata.count < list.regions.len) {
+                const block_id = block_count;
+                const region_id = list.metadata.count;
+                list.regions[list.metadata.count] = region;
+                list.metadata.count += 1;
+
+                return .{
+                    .block = @intCast(block_id),
+                    .region = @intCast(region_id),
+                };
+            } else {
+                return Error.no_space;
+            }
+        }
+    }
+
+    const cache_line_count = 5;
+    const list_region_count = @divExact((cache_line_count * lib.cache_line_size) - @sizeOf(Metadata), @sizeOf(PhysicalMemoryRegion));
+
+    comptime {
+        assert(@sizeOf(RegionList) % lib.cache_line_size == 0);
+    }
+};
+
 pub const RAM = extern struct {
-    lists: [lib.arch.reverse_valid_page_sizes.len]?*Region = .{null} ** lib.arch.valid_page_sizes.len,
+    lists: [lib.arch.reverse_valid_page_sizes.len]RegionList = .{.{}} ** lib.arch.valid_page_sizes.len,
+    allocated: RegionList = .{},
+    privileged: RegionList = .{},
+    allocate: bool = true,
 
     const AllocateError = error{
         OutOfMemory,
@@ -98,39 +271,20 @@ pub const RAM = extern struct {
         unreachable;
     }
 
-    pub const Region = extern struct {
-        region: PhysicalMemoryRegion,
-        next: ?*@This() = null,
-
-        const UnalignedAllocationResult = extern struct {
-            wasted: PhysicalMemoryRegion,
-            allocated: PhysicalMemoryRegion,
-        };
-
-        inline fn allocateUnaligned(free_ram: *Region, size: usize, alignment: usize) ?UnalignedAllocationResult {
-            const aligned_region_address = lib.alignForward(usize, free_ram.region.address.value(), alignment);
-            const wasted_space = aligned_region_address - free_ram.region.address.value();
-            if (free_ram.region.size >= wasted_space + size) {
-                const wasted_region = free_ram.region.takeSlice(wasted_space);
-                const allocated_region = free_ram.region.takeSlice(size);
-                return UnalignedAllocationResult{
-                    .wasted = wasted_region,
-                    .allocated = allocated_region,
-                };
-            }
-
-            return null;
-        }
-    };
+    pub fn appendRegion(ram: *RAM, region: PhysicalMemoryRegion) !void {
+        _ = region;
+        _ = ram;
+        @panic("TODO: appendRegion");
+    }
 };
 
 pub const CPUMemory = extern struct {
     privileged: RAM = .{},
     user: RAM = .{},
-    flags: Flags,
+    flags: Flags = .{},
 
     const Flags = packed struct(u64) {
-        allocate: bool,
+        allocate: bool = true,
         reserved: u63 = 0,
     };
 };
@@ -168,11 +322,11 @@ pub const Root = extern struct {
         assert(@sizeOf(Root) % lib.arch.valid_page_sizes[0] == 0);
     }
 
-    pub fn copy(root: *Root, other: *Root) void {
-        other.static = root.static;
-        // TODO:
-        other.dynamic = root.dynamic;
-    }
+    // pub fn copy(root: *Root, other: *Root) void {
+    //     other.static = root.static;
+    //     // TODO:
+    //     other.dynamic = root.dynamic;
+    // }
 
     pub inline fn hasPermissions(root: *const Root, comptime capability_type: birth.capabilities.Type, command: birth.capabilities.Command(capability_type)) bool {
         return switch (capability_type) {
@@ -187,7 +341,10 @@ pub const Root = extern struct {
                 .log => root.dynamic.io.debug,
             },
             .cpu_memory => root.dynamic.cpu_memory.flags.allocate,
-            .ram => unreachable,
+            .ram => switch (command) {
+                .allocate => root.dynamic.ram.allocate,
+                else => @panic("TODO: else => ram"),
+            },
             .page_table => unreachable,
         };
     }
@@ -197,30 +354,42 @@ pub const Root = extern struct {
     };
 
     // Fast path
-    pub fn allocatePages(root: *Root, size: usize) AllocateError!PhysicalMemoryRegion {
+    fn allocateRAMRaw(root: *Root, size: usize) AllocateError!PhysicalMemoryRegion {
+        lib.log.err("New allocation demanded: 0x{x} bytes", .{size});
         assert(size != 0);
         assert(lib.isAligned(size, lib.arch.valid_page_sizes[0]));
         var index = RAM.getListIndex(size);
 
         const result = blk: {
             while (true) : (index -= 1) {
-                const list = root.dynamic.ram.lists[index];
-                var iterator = list;
+                const list = &root.dynamic.ram.lists[index];
+                var iterator: ?*cpu.capabilities.RegionList = list;
 
-                while (iterator) |free_ram| : (iterator = free_ram.next) {
-                    if (free_ram.region.size >= size) {
-                        if (free_ram.region.size >= size) {
-                            const result = free_ram.region.takeSlice(size);
-                            break :blk result;
-                        } else {
-                            @panic("TODO: cnsume all reigon");
-                        }
-                    }
+                const page_size = @as(u64, switch (index) {
+                    0 => lib.arch.reverse_valid_page_sizes[0],
+                    1 => lib.arch.reverse_valid_page_sizes[1],
+                    2 => lib.arch.reverse_valid_page_sizes[2],
+                    else => unreachable,
+                });
+
+                var list_count: usize = 0;
+                while (iterator) |free_ram_list| : ({
+                    iterator = free_ram_list.metadata.next;
+                    list_count += 1;
+                }) {
+                    const allocation = free_ram_list.allocate(size) catch continue;
+                    list_count += 1;
+                    log.err("Found 0x{x}-page-size region for 0x{x} bytes after ({}/{}) lists", .{ page_size, size, list_count, list.metadata.count });
+                    log.err("======", .{});
+                    break :blk allocation;
                 }
 
+                log.err("Could not find any 0x{x}-page-size region for 0x{x} bytes after {} lists", .{ page_size, size, list.metadata.count });
+
                 if (index == 0) break;
             }
 
+            log.err("allocateRAMRaw", .{});
             return error.OutOfMemory;
         };
 
@@ -229,6 +398,40 @@ pub const Root = extern struct {
         return result;
     }
 
+    pub fn allocateRAM(root: *Root, size: usize) AllocateError!birth.capabilities.RAM {
+        const result = try allocateRAMRaw(root, size);
+        const reference = root.dynamic.ram.allocated.append(result) catch |err| {
+            log.err("err(user): {}", .{err});
+            return AllocateError.OutOfMemory;
+        };
+        return reference;
+    }
+
+    pub fn allocateRAMPrivileged(root: *Root, size: usize) AllocateError!PhysicalMemoryRegion {
+        const result = try allocateRAMRaw(root, size);
+        const reference = root.dynamic.ram.privileged.append(result) catch blk: {
+            const region_list = try cpu.heap.create(RegionList);
+            region_list.* = .{};
+            const ref = region_list.append(result) catch |err| {
+                log.err("Err(priv): {}", .{err});
+                return AllocateError.OutOfMemory;
+            };
+
+            var iterator: ?*RegionList = &root.dynamic.ram.privileged;
+            while (iterator) |rl| : (iterator = rl.metadata.next) {
+                if (rl.metadata.next == null) {
+                    rl.metadata.next = region_list;
+                    region_list.metadata.previous = rl;
+                    break;
+                }
+            }
+
+            break :blk ref;
+        };
+        _ = reference;
+        return result;
+    }
+
     // Slow uncommon path. Use cases:
     // 1. CR3 switch. This is assumed to be privileged, so this function assumes privileged use of the memory
     pub fn allocatePageCustomAlignment(root: *Root, size: usize, alignment: usize) AllocateError!PhysicalMemoryRegion {
@@ -238,33 +441,35 @@ pub const Root = extern struct {
         var index = RAM.getListIndex(size);
 
         while (true) : (index -= 1) {
-            if (root.dynamic.ram.lists[index]) |smallest_region_list| {
-                var iterator: ?*cpu.capabilities.RAM.Region = smallest_region_list;
-                while (iterator) |free_ram| : (iterator = free_ram.next) {
-                    if (lib.isAligned(free_ram.region.address.value(), alignment)) {
-                        if (free_ram.region.size >= size) {
-                            const allocated_region = free_ram.region.takeSlice(size);
-                            return allocated_region;
-                        }
-                    } else if (free_ram.allocateUnaligned(size, alignment)) |unaligned_allocation| {
-                        try root.addRegion(&root.dynamic.ram, unaligned_allocation.wasted);
-                        return unaligned_allocation.allocated;
-                    }
+            const smallest_region_list = &root.dynamic.ram.lists[index];
+            var iterator: ?*cpu.capabilities.RegionList = smallest_region_list;
+            while (iterator) |free_region_list| : (iterator = free_region_list.metadata.next) {
+                if (free_region_list.metadata.count > 0) {
+                    const physical_allocation = free_region_list.allocateAligned(size, alignment) catch blk: {
+                        const splitted_allocation = free_region_list.allocateAlignedSplitting(size, alignment) catch continue;
+                        _ = try root.appendRegion(&root.dynamic.ram, splitted_allocation.wasted);
+                        break :blk splitted_allocation.allocated;
+                    };
+
+                    return physical_allocation;
                 }
             }
 
             if (index == 0) break;
         }
 
+        log.err("allocatePageCustomAlignment", .{});
         return AllocateError.OutOfMemory;
     }
 
     fn allocateSingle(root: *Root, comptime T: type) AllocateError!*T {
+        const size = @sizeOf(T);
+        const alignment = @alignOf(T);
         var iterator = root.heap.first;
         while (iterator) |heap_region| : (iterator = heap_region.next) {
-            if (heap_region.alignmentFits(@alignOf(T))) {
-                if (heap_region.sizeFits(@sizeOf(T))) {
-                    const allocated_region = heap_region.takeRegion(@sizeOf(T));
+            if (heap_region.alignmentFits(alignment)) {
+                if (heap_region.sizeFits(size)) {
+                    const allocated_region = heap_region.takeRegion(size);
                     const result = &allocated_region.toHigherHalfVirtualAddress().access(T)[0];
                     return result;
                 }
@@ -273,7 +478,7 @@ pub const Root = extern struct {
             }
         }
 
-        const physical_region = try root.allocatePages(lib.arch.valid_page_sizes[0]);
+        const physical_region = try root.allocateRAM(lib.arch.valid_page_sizes[0]);
         const heap_region = physical_region.toHigherHalfVirtualAddress().address.access(*Heap.Region);
         const first = root.heap.first;
         heap_region.* = .{
@@ -294,15 +499,11 @@ pub const Root = extern struct {
         @panic("TODO many");
     }
 
-    fn addRegion(root: *Root, ram: *RAM, physical_region: PhysicalMemoryRegion) !void {
-        const index = RAM.getListIndex(physical_region.size);
-        const new_region = try root.allocateSingle(RAM.Region);
-        new_region.* = RAM.Region{
-            .region = physical_region,
-            .next = root.dynamic.ram.lists[index],
-        };
-
-        ram.lists[index] = new_region;
+    fn appendRegion(root: *Root, ram: *RAM, region: PhysicalMemoryRegion) !birth.capabilities.RAM {
+        _ = root;
+        const index = RAM.getListIndex(region.size);
+        const ref = ram.lists[index].append(region) catch @panic("TODO: allocate in appendRegion");
+        return ref;
     }
 
     pub const AllocateCPUMemoryOptions = packed struct {
@@ -315,7 +516,7 @@ pub const Root = extern struct {
             false => &root.dynamic.cpu_memory.user,
         };
 
-        try root.addRegion(ram_region, physical_region);
+        try root.appendRegion(ram_region, physical_region);
     }
 
     pub const Heap = extern struct {
@@ -349,7 +550,7 @@ pub const Root = extern struct {
                 const allocation = heap_region.allocate(T, count) catch continue;
                 return allocation;
             }
-            @panic("TODO: allocate");
+            @panic("TODO: heap allocate");
         }
 
         const Region = extern struct {
@@ -387,20 +588,20 @@ pub const Root = extern struct {
                 return &result[0];
             }
 
-            inline fn canAllocateDirectly(region: Region, size: usize, alignment: usize) bool {
-                const alignment_fits = region.alignmentFits(alignment);
-                const size_fits = region.sizeFits(size);
-                return alignment_fits and size_fits;
-            }
+            // inline fn canAllocateDirectly(region: Region, size: usize, alignment: usize) bool {
+            //     const alignment_fits = region.alignmentFits(alignment);
+            //     const size_fits = region.sizeFits(size);
+            //     return alignment_fits and size_fits;
+            // }
 
-            inline fn canAllocateSplitting(region: Region, size: usize, alignment: usize) bool {
-                const free_region = region.getFreeRegion();
-                const aligned_region_address = lib.alignForward(usize, free_region.address.value(), alignment);
-                const wasted_space = aligned_region_address - free_region.address.value();
-                log.warn("Wasted space: {} bytes", .{wasted_space});
-                _ = size;
-                @panic("TODO: canAllocateSplitting");
-            }
+            // inline fn canAllocateSplitting(region: Region, size: usize, alignment: usize) bool {
+            //     const free_region = region.getFreeRegion();
+            //     const aligned_region_address = lib.alignForward(usize, free_region.address.value(), alignment);
+            //     const wasted_space = aligned_region_address - free_region.address.value();
+            //     log.warn("Wasted space: {} bytes", .{wasted_space});
+            //     _ = size;
+            //     @panic("TODO: canAllocateSplitting");
+            // }
 
             inline fn sizeFits(region: Region, size: usize) bool {
                 return region.descriptor.size - region.allocated_size >= size;

src/cpu/syscall.zig

@@ -0,0 +1,21 @@
+const lib = @import("lib");
+const cpu = @import("cpu");
+const birth = @import("birth");
+
+pub fn process(options: birth.syscall.Options, arguments: birth.syscall.Arguments) birth.syscall.Result {
+    return switch (options.general.convention) {
+        .birth => switch (options.birth.type) {
+            inline else => |capability| switch (@as(birth.capabilities.Command(capability), @enumFromInt(options.birth.command))) {
+                inline else => |command| blk: {
+                    const Syscall = birth.capabilities.Syscall(capability, command);
+                    const result = cpu.capabilities.processCommand(Syscall, arguments) catch |err| {
+                        lib.log.err("Syscall ended up in error: {}", .{err});
+                        break :blk Syscall.fromError(err);
+                    };
+                    break :blk Syscall.fromResult(result);
+                },
+            },
+        },
+        .linux => @panic("linux syscall"),
+    };
+}

src/host/runner/main.zig

@@ -284,7 +284,7 @@ pub fn main() anyerror!void {
                 // GF2, when not found in the PATH, can give problems
                 const use_gf = switch (lib.os) {
                     .macos => false,
-                    .linux => false,
+                    .linux => true,
                     else => false,
                 };
 
@@ -292,7 +292,8 @@ pub fn main() anyerror!void {
                 if (use_gf) {
                     try command_line_gdb.append("gf2");
                 } else {
-                    try command_line_gdb.append("kitty");
+                    const terminal_emulator = "foot";
+                    try command_line_gdb.append(terminal_emulator);
                     try command_line_gdb.append(switch (lib.os) {
                         .linux => "gdb",
                         .macos => "x86_64-elf-gdb",
@@ -331,12 +332,12 @@ pub fn main() anyerror!void {
                 try debugger_process.spawn();
             }
 
-            var process = host.ChildProcess.init(argument_list.items, wrapped_allocator.zigUnwrap());
+            var emulator_process = host.ChildProcess.init(argument_list.items, wrapped_allocator.zigUnwrap());
             //process.stdout_behavior = .I;
-            const result = try process.spawnAndWait();
+            const emulator_process_result = try emulator_process.spawnAndWait();
 
-            if (result == .Exited) {
-                const exit_code = result.Exited;
+            if (emulator_process_result == .Exited) {
+                const exit_code = emulator_process_result.Exited;
                 if (exit_code & 1 != 0) {
                     const mask = lib.maxInt(@TypeOf(exit_code)) - 1;
                     const masked_exit_code = exit_code & mask;
@@ -354,7 +355,7 @@ pub fn main() anyerror!void {
                     } else log.err("QEMU exited with unexpected code: {}. Masked: {}", .{ exit_code, masked_exit_code });
                 } else log.err("QEMU exited with unexpected code: {}", .{exit_code});
             } else {
-                log.err("QEMU was {s}", .{@tagName(result)});
+                log.err("QEMU was {s}", .{@tagName(emulator_process_result)});
             }
 
             if (debugcon_file_used) {

src/lib.zig

@@ -1,6 +1,8 @@
 const common = @import("common.zig");
 pub usingnamespace common;
 
+pub const cache_line_size = 64;
+
 pub const arch = @import("lib/arch.zig");
 /// This is done so the allocator can respect allocating from different address spaces
 pub const config = @import("lib/config.zig");
@@ -293,11 +295,13 @@ pub const Allocator = extern struct {
     };
 
     pub fn zigAllocate(context: *anyopaque, size: usize, ptr_align: u8, return_address: usize) ?[*]u8 {
-        _ = context;
-        _ = size;
-        _ = ptr_align;
         _ = return_address;
-        return null;
+        const allocator: *Allocator = @ptrCast(@alignCast(context));
+        // Not understanding why Zig API is like this:
+        const alignment = @as(u64, 1) << @as(u6, @intCast(ptr_align));
+        const result = allocator.allocateBytes(size, alignment) catch return null;
+        common.assert(result.size >= size);
+        return @ptrFromInt(result.address);
     }
 
     pub fn zigResize(context: *anyopaque, buffer: []u8, buffer_alignment: u8, new_length: usize, return_address: usize) bool {
@@ -660,11 +664,9 @@ pub fn ErrorSet(comptime error_names: []const []const u8, comptime predefined_fi
     };
 }
 
-pub fn getDebugInformation(allocator: common.ZigAllocator, elf_file: []align(common.default_sector_size) const u8) !common.ModuleDebugInfo {
+pub fn getDebugInformation(allocator: common.ZigAllocator, elf_file: []align(arch.valid_page_sizes[0]) const u8) !common.ModuleDebugInfo {
     const elf = common.elf;
-    var module_debug_info: common.ModuleDebugInfo = undefined;
-    _ = module_debug_info;
-    const hdr = @as(*const elf.Ehdr, @ptrCast(&elf_file[0]));
+    const hdr = @as(*align(1) const elf.Ehdr, @ptrCast(&elf_file[0]));
     if (!common.equal(u8, hdr.e_ident[0..4], elf.MAGIC)) return error.InvalidElfMagic;
     if (hdr.e_ident[elf.EI_VERSION] != 1) return error.InvalidElfVersion;
 
@@ -673,76 +675,92 @@ pub fn getDebugInformation(allocator: common.ZigAllocator, elf_file: []align(com
     const shoff = hdr.e_shoff;
     const str_section_off = shoff + @as(u64, hdr.e_shentsize) * @as(u64, hdr.e_shstrndx);
     const str_shdr = @as(
-        *const elf.Shdr,
-        @ptrCast(@alignCast(&elf_file[common.cast(usize, str_section_off) orelse return error.Overflow])),
+        *align(1) const elf.Shdr,
+        @ptrCast(&elf_file[common.cast(usize, str_section_off) orelse return error.Overflow]),
     );
     const header_strings = elf_file[str_shdr.sh_offset .. str_shdr.sh_offset + str_shdr.sh_size];
     const shdrs = @as(
-        [*]const elf.Shdr,
-        @ptrCast(@alignCast(&elf_file[shoff])),
+        [*]align(1) const elf.Shdr,
+        @ptrCast(&elf_file[shoff]),
     )[0..hdr.e_shnum];
 
-    var opt_debug_info: ?[]const u8 = null;
-    var opt_debug_abbrev: ?[]const u8 = null;
-    var opt_debug_str: ?[]const u8 = null;
-    var opt_debug_str_offsets: ?[]const u8 = null;
-    var opt_debug_line: ?[]const u8 = null;
-    var opt_debug_line_str: ?[]const u8 = null;
-    var opt_debug_ranges: ?[]const u8 = null;
-    var opt_debug_loclists: ?[]const u8 = null;
-    var opt_debug_rnglists: ?[]const u8 = null;
-    var opt_debug_addr: ?[]const u8 = null;
-    var opt_debug_names: ?[]const u8 = null;
-    var opt_debug_frame: ?[]const u8 = null;
+    var sections: common.dwarf.DwarfInfo.SectionArray = common.dwarf.DwarfInfo.null_section_array;
+
+    // Combine section list. This takes ownership over any owned sections from the parent scope.
+    errdefer for (sections) |section| if (section) |s| if (s.owned) allocator.free(s.data);
+
+    var separate_debug_filename: ?[]const u8 = null;
+    _ = separate_debug_filename;
+    var separate_debug_crc: ?u32 = null;
+    _ = separate_debug_crc;
 
     for (shdrs) |*shdr| {
-        if (shdr.sh_type == elf.SHT_NULL) continue;
-
+        if (shdr.sh_type == elf.SHT_NULL or shdr.sh_type == elf.SHT_NOBITS) continue;
         const name = common.sliceTo(header_strings[shdr.sh_name..], 0);
-        if (common.equal(u8, name, ".debug_info")) {
-            opt_debug_info = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_abbrev")) {
-            opt_debug_abbrev = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_str")) {
-            opt_debug_str = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_str_offsets")) {
-            opt_debug_str_offsets = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_line")) {
-            opt_debug_line = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_line_str")) {
-            opt_debug_line_str = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_ranges")) {
-            opt_debug_ranges = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_loclists")) {
-            opt_debug_loclists = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_rnglists")) {
-            opt_debug_rnglists = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_addr")) {
-            opt_debug_addr = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_names")) {
-            opt_debug_names = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
-        } else if (common.equal(u8, name, ".debug_frame")) {
-            opt_debug_frame = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
+
+        if (common.equal(u8, name, ".gnu_debuglink")) {
+            @panic("WTF");
+            // const gnu_debuglink = try chopSlice(mapped_mem, shdr.sh_offset, shdr.sh_size);
+            // const debug_filename = mem.sliceTo(@as([*:0]const u8, @ptrCast(gnu_debuglink.ptr)), 0);
+            // const crc_offset = mem.alignForward(usize, @intFromPtr(&debug_filename[debug_filename.len]) + 1, 4) - @intFromPtr(gnu_debuglink.ptr);
+            // const crc_bytes = gnu_debuglink[crc_offset .. crc_offset + 4];
+            // separate_debug_crc = mem.readIntSliceNative(u32, crc_bytes);
+            // separate_debug_filename = debug_filename;
+            // continue;
         }
+
+        var section_index: ?usize = null;
+        inline for (@typeInfo(common.dwarf.DwarfSection).Enum.fields, 0..) |section, i| {
+            if (common.equal(u8, "." ++ section.name, name)) section_index = i;
+        }
+        if (section_index == null) continue;
+        if (sections[section_index.?] != null) continue;
+
+        const section_bytes = try chopSlice(elf_file, shdr.sh_offset, shdr.sh_size);
+        sections[section_index.?] = if ((shdr.sh_flags & elf.SHF_COMPRESSED) > 0) blk: {
+            var section_stream = common.fixedBufferStream(section_bytes);
+            var section_reader = section_stream.reader();
+            const chdr = section_reader.readStruct(elf.Chdr) catch continue;
+            if (chdr.ch_type != .ZLIB) continue;
+
+            if (true) @panic("ZLIB");
+            break :blk undefined;
+            // var zlib_stream = std.compress.zlib.decompressStream(allocator, section_stream.reader()) catch continue;
+            // defer zlib_stream.deinit();
+            //
+            // var decompressed_section = try allocator.alloc(u8, chdr.ch_size);
+            // errdefer allocator.free(decompressed_section);
+            //
+            // const read = zlib_stream.reader().readAll(decompressed_section) catch continue;
+            // assert(read == decompressed_section.len);
+            //
+            // break :blk .{
+            //     .data = decompressed_section,
+            //     .virtual_address = shdr.sh_addr,
+            //     .owned = true,
+            // };
+        } else .{
+            .data = section_bytes,
+            .virtual_address = shdr.sh_addr,
+            .owned = false,
+        };
     }
 
+    const missing_debug_info =
+        sections[@intFromEnum(common.dwarf.DwarfSection.debug_info)] == null or
+        sections[@intFromEnum(common.dwarf.DwarfSection.debug_abbrev)] == null or
+        sections[@intFromEnum(common.dwarf.DwarfSection.debug_str)] == null or
+        sections[@intFromEnum(common.dwarf.DwarfSection.debug_line)] == null;
+    common.assert(!missing_debug_info);
+
     var di = common.dwarf.DwarfInfo{
         .endian = endian,
-        .debug_info = opt_debug_info orelse return error.MissingDebugInfo,
-        .debug_abbrev = opt_debug_abbrev orelse return error.MissingDebugInfo,
-        .debug_str = opt_debug_str orelse return error.MissingDebugInfo,
-        .debug_str_offsets = opt_debug_str_offsets,
-        .debug_line = opt_debug_line orelse return error.MissingDebugInfo,
-        .debug_line_str = opt_debug_line_str,
-        .debug_ranges = opt_debug_ranges,
-        .debug_loclists = opt_debug_loclists,
-        .debug_rnglists = opt_debug_rnglists,
-        .debug_addr = opt_debug_addr,
-        .debug_names = opt_debug_names,
-        .debug_frame = opt_debug_frame,
+        .sections = sections,
+        .is_macho = false,
     };
 
     try common.dwarf.openDwarfDebugInfo(&di, allocator);
+
     return di;
 }
 
@@ -773,6 +791,14 @@ pub fn RegionInterface(comptime Region: type) type {
                 .size = info.size,
             };
         }
+
+        pub inline fn invalid() Region {
+            return Region{
+                .address = Addr.invalid(),
+                .size = 0,
+            };
+        }
+
         pub inline fn fromRaw(info: struct {
             raw_address: AddrT,
             size: AddrT,
@@ -842,15 +868,22 @@ pub fn RegionInterface(comptime Region: type) type {
             return result;
         }
 
-        pub inline fn takeSlice(region: *Region, size: AddrT) Region {
-            common.assert(size <= region.size);
-            const result = Region{
-                .address = region.address,
-                .size = size,
-            };
-            region.* = region.offset(size);
+        const TakeSliceError = error{
+            not_enough_space,
+        };
 
-            return result;
+        pub inline fn takeSlice(region: *Region, size: AddrT) !Region {
+            if (size <= region.size) {
+                const result = Region{
+                    .address = region.address,
+                    .size = size,
+                };
+                region.* = region.offset(size);
+
+                return result;
+            }
+
+            return TakeSliceError.not_enough_space;
         }
 
         pub inline fn split(region: Region, comptime count: comptime_int) [count]Region {

src/lib/filesystem/fat32.zig

@@ -353,10 +353,7 @@ pub const Cache = extern struct {
         const aligned_file_size = lib.alignForward(usize, file_size, cache.disk.sector_size);
         const lba = cache.clusterToSector(first_cluster);
 
-        log.debug("Start disk callback", .{});
-
         const result = try cache.disk.callbacks.read(cache.disk, @divExact(aligned_file_size, cache.disk.sector_size), lba, file_buffer);
-        log.debug("End disk callback", .{});
         return result.buffer[0..file_size];
     }
 

src/user.zig

@@ -4,15 +4,16 @@ const assert = lib.assert;
 const ExecutionMode = lib.Syscall.ExecutionMode;
 
 const birth = @import("birth");
-const capabilities = birth.capabilities;
 pub const Syscall = birth.capabilities.Syscall;
 
 pub const arch = @import("user/arch.zig");
+pub const capabilities = @import("user/capabilities.zig");
 const core_state = @import("user/core_state.zig");
 pub const CoreState = core_state.CoreState;
 pub const PinnedState = core_state.PinnedState;
 pub const libc = @import("user/libc.zig");
 pub const thread = @import("user/thread.zig");
+pub const Thread = thread.Thread;
 pub const process = @import("user/process.zig");
 const vas = @import("user/virtual_address_space.zig");
 const VirtualAddress = lib.VirtualAddress;
@@ -30,7 +31,7 @@ comptime {
 pub const writer = lib.Writer(void, Writer.Error, Writer.write){ .context = {} };
 const Writer = extern struct {
     const syscall = Syscall(.io, .log);
-    const Error = Writer.syscall.ErrorSet.Error;
+    const Error = Writer.syscall.Error;
 
     fn write(_: void, bytes: []const u8) Error!usize {
         const result = try Writer.syscall.blocking(bytes);
@@ -52,16 +53,36 @@ pub fn zigPanic(message: []const u8, _: ?*lib.StackTrace, _: ?usize) noreturn {
 }
 
 pub fn panic(comptime format: []const u8, arguments: anytype) noreturn {
-    lib.log.scoped(.PANIC).err(format, arguments);
+    var buffer: [0x100]u8 = undefined;
+    const message: []const u8 = lib.bufPrint(&buffer, format, arguments) catch "Failed to get panic message!";
     while (true) {
-        Syscall(.process, .exit).blocking(false) catch |err| log.err("Exit failed: {}", .{err});
+        Syscall(.process, .panic).blocking(.{
+            .message = message,
+            .exit_code = 1,
+        }) catch |err| log.err("Exit failed: {}", .{err});
     }
 }
 
 pub const Scheduler = extern struct {
+    current_thread: *Thread,
+    thread_queue: ?*Thread = null,
     time_slice: u32,
     core_id: u32,
     core_state: CoreState,
+    bootstrap_thread: Thread,
+
+    pub fn enqueueThread(scheduler: *Scheduler, thread_to_queue: *Thread) void {
+        // TODO: check queue
+        // TODO: defer check queue
+        if (scheduler.thread_queue) |thread_queue| {
+            _ = thread_queue;
+            @panic("TODO: enqueueThread");
+        } else {
+            scheduler.thread_queue = thread_to_queue;
+            thread_to_queue.previous = thread_to_queue;
+            thread_to_queue.next = thread_to_queue;
+        }
+    }
 };
 
 pub inline fn currentScheduler() *Scheduler {
@@ -83,10 +104,18 @@ pub export fn start(scheduler: *arch.Scheduler, arg_init: bool) callconv(.C) nor
     if (is_init) {
         assert(scheduler.common.generic.setup_stack_lock.load(.Monotonic));
     }
-    assert(scheduler.common.generic.disabled);
-    scheduler.initDisabled();
+
+    const frame_id = capabilities.frameCreate(lib.arch.valid_page_sizes[0]) catch |err| {
+        panic("Unable to create frame: {}", .{err});
+    };
+    _ = frame_id;
+
+    @panic("TODO: start");
+    // assert(scheduler.common.generic.disabled);
+    // scheduler.initDisabled();
+    // thread.initBootstrap(scheduler);
     // command_buffer = Syscall(.cpu, .get_command_buffer).blocking(&command_buffer) catch @panic("Unable to get command buffer");
-    Syscall(.cpu, .shutdown).blocking({}) catch unreachable;
+    // Syscall(.cpu, .shutdown).blocking({}) catch unreachable;
 }
 
 // export fn birthInitializeDisabled(scheduler: *arch.Scheduler, arg_init: bool) callconv(.C) noreturn {

src/user/arch/x86_64.zig

@@ -46,8 +46,6 @@ pub fn _start() callconv(.Naked) noreturn {
         :
         : [startFunction] "r" (user.start),
     );
-
-    unreachable;
 }
 
 pub inline fn setInitialState(register_arena: *RegisterArena, entry: VirtualAddress, stack_virtual_address: VirtualAddress, arguments: birth.syscall.Arguments) void {

src/user/capabilities.zig

@@ -1,20 +1,53 @@
 const lib = @import("lib");
+const log = lib.log;
 const assert = lib.assert;
 const birth = @import("birth");
+const user = @import("user");
+const Syscall = user.Syscall;
 
 // TODO: ref
-pub fn frameCreate(ref: usize, bytes: usize) !usize {
-    return mappableCapabilityCreate(ref, .cpu_memory, bytes);
+pub fn frameCreate(bytes: usize) !birth.capabilities.Reference {
+    return mappableCapabilityCreate(.cpu_memory, bytes);
 }
 
-fn mappableCapabilityCreate(ref: usize, mappable_capability: birth.capabilities.Type.Mappable, bytes: usize) !usize {
-    _ = mappable_capability;
-    _ = ref;
+fn mappableCapabilityCreate(capability: birth.capabilities.Type.Mappable, bytes: usize) !birth.capabilities.Reference {
     assert(bytes > 0);
+
+    return RamDescendant.create(capability, bytes);
 }
 
-fn ramDescendantCreate(
-    ref: usize,
-) !usize {
-    _ = ref;
+const Ram = extern struct {
+    pub fn allocate(size: usize) !usize {
+        _ = size;
+        log.err("TODO: allocate", .{});
+        return error.not_implemented;
+    }
+};
+
+const RamDescendant = extern struct {
+    capability: usize,
+    size: usize,
+
+    pub fn create(capability: birth.capabilities.Type.Mappable, size: usize) !birth.capabilities.Reference {
+        const allocation = try Syscall(.ram, .allocate).blocking(size);
+        const result = try retype(allocation, 0, capability.toCapability(), size, 1);
+        try destroy(allocation);
+        return result;
+    }
+};
+
+pub fn retype(source: birth.capabilities.Reference, offset: usize, capability: birth.capabilities.Type, object_size: usize, object_count: usize) !birth.capabilities.Reference {
+    _ = object_count;
+    _ = object_size;
+    _ = capability;
+    _ = offset;
+    _ = source;
+    log.err("TODO: retype", .{});
+    return error.not_implemented;
+}
+
+pub fn destroy(capability: birth.capabilities.Reference) !void {
+    _ = capability;
+    log.err("TODO: destroy", .{});
+    return error.not_implemented;
 }

src/user/thread.zig

@@ -13,44 +13,35 @@ const max_thread_count = 256;
 
 pub const Thread = extern struct {
     self: *Thread,
-    previous: ?*Thread,
-    next: ?*Thread,
+    previous: ?*Thread = null,
+    next: ?*Thread = null,
     stack: [*]u8,
     stack_top: [*]align(lib.arch.stack_alignment) u8,
     register_arena: birth.arch.RegisterArena align(lib.arch.stack_alignment),
     core_id: u32,
 
     pub fn init(thread: *Thread, scheduler: *user.arch.Scheduler) void {
-        thread.self = thread;
-        thread.previous = null;
-        thread.next = null;
-        thread.core_id = scheduler.generic.core_id;
+        thread.* = Thread{
+            .self = thread,
+            .core_id = scheduler.generic.core_id,
+            .stack = thread.stack,
+            .stack_top = thread.stack_top,
+            .register_arena = thread.register_arena,
+        };
     }
 };
 
-pub const Mutex = extern struct {
-    locked: bool = false,
-
-    pub inline fn internalLock(mutex: *volatile Mutex) void {
-        mutex.locked = true;
-    }
-};
-
-var static_stack: [0x10000]u8 align(lib.arch.stack_alignment) = undefined;
-var static_thread: Thread = undefined;
-var static_thread_lock = Mutex{};
-
-pub fn initDisabled(scheduler: *user.arch.Scheduler) noreturn {
-    const thread = &static_thread;
-    static_thread_lock.internalLock();
-    thread.stack = &static_stack;
-    thread.stack_top = static_stack[static_stack.len..];
+pub fn initBootstrap(scheduler: *user.arch.Scheduler) noreturn {
+    const thread = &scheduler.generic.bootstrap_thread;
+    thread.stack = &scheduler.common.generic.setup_stack;
+    thread.stack_top = @ptrFromInt(@intFromPtr(&scheduler.common.generic.setup_stack) + scheduler.common.generic.setup_stack.len);
     thread.init(scheduler);
 
     // TODO: use RAX as parameter?
 
     user.arch.setInitialState(&thread.register_arena, VirtualAddress.new(bootstrapThread), VirtualAddress.new(thread.stack_top), .{0} ** 6);
-
+    scheduler.generic.enqueueThread(thread);
+    scheduler.generic.current_thread = thread;
     scheduler.common.generic.has_work = true;
 
     scheduler.restore(&thread.register_arena);