217 lines
4.2 KiB
C
217 lines
4.2 KiB
C
/*
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* Copyright (c) 1999-2007 Apple Inc. All rights reserved.
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*/
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#ifndef _OS_OSBYTEORDERARM_H
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#define _OS_OSBYTEORDERARM_H
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#include <stdint.h>
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#include <arm/arch.h> /* for _ARM_ARCH_6 */
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/* Generic byte swapping functions. */
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__DARWIN_OS_INLINE
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uint16_t
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_OSSwapInt16(
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uint16_t _data
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)
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{
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/* Reduces to 'rev16' with clang */
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return (uint16_t)(_data << 8 | _data >> 8);
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}
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__DARWIN_OS_INLINE
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uint32_t
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_OSSwapInt32(
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uint32_t _data
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)
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{
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#if defined(__llvm__)
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_data = __builtin_bswap32(_data);
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#else
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/* This actually generates the best code */
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_data = (((_data ^ (_data >> 16 | (_data << 16))) & 0xFF00FFFF) >> 8) ^ (_data >> 8 | _data << 24);
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#endif
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return _data;
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}
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__DARWIN_OS_INLINE
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uint64_t
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_OSSwapInt64(
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uint64_t _data
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)
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{
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#if defined(__llvm__)
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return __builtin_bswap64(_data);
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#else
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union {
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uint64_t _ull;
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uint32_t _ul[2];
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} _u;
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/* This actually generates the best code */
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_u._ul[0] = (uint32_t)(_data >> 32);
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_u._ul[1] = (uint32_t)(_data & 0xffffffff);
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_u._ul[0] = _OSSwapInt32(_u._ul[0]);
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_u._ul[1] = _OSSwapInt32(_u._ul[1]);
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return _u._ull;
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#endif
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}
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/* Functions for byte reversed loads. */
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struct _OSUnalignedU16 {
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volatile uint16_t __val;
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} __attribute__((__packed__));
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struct _OSUnalignedU32 {
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volatile uint32_t __val;
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} __attribute__((__packed__));
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struct _OSUnalignedU64 {
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volatile uint64_t __val;
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} __attribute__((__packed__));
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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uint16_t
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_OSReadSwapInt16(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt16(((struct _OSUnalignedU16 *)((uintptr_t)_base + _offset))->__val);
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}
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#else
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__DARWIN_OS_INLINE
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uint16_t
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OSReadSwapInt16(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt16(((struct _OSUnalignedU16 *)((uintptr_t)_base + _offset))->__val);
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}
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#endif
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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uint32_t
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_OSReadSwapInt32(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt32(((struct _OSUnalignedU32 *)((uintptr_t)_base + _offset))->__val);
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}
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#else
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__DARWIN_OS_INLINE
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uint32_t
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OSReadSwapInt32(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt32(((struct _OSUnalignedU32 *)((uintptr_t)_base + _offset))->__val);
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}
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#endif
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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uint64_t
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_OSReadSwapInt64(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt64(((struct _OSUnalignedU64 *)((uintptr_t)_base + _offset))->__val);
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}
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#else
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__DARWIN_OS_INLINE
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uint64_t
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OSReadSwapInt64(
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const volatile void * _base,
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uintptr_t _offset
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)
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{
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return _OSSwapInt64(((struct _OSUnalignedU64 *)((uintptr_t)_base + _offset))->__val);
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}
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#endif
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/* Functions for byte reversed stores. */
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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void
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_OSWriteSwapInt16(
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volatile void * _base,
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uintptr_t _offset,
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uint16_t _data
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)
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{
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((struct _OSUnalignedU16 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt16(_data);
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}
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#else
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__DARWIN_OS_INLINE
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void
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OSWriteSwapInt16(
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volatile void * _base,
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uintptr_t _offset,
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uint16_t _data
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)
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{
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((struct _OSUnalignedU16 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt16(_data);
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}
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#endif
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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void
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_OSWriteSwapInt32(
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volatile void * _base,
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uintptr_t _offset,
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uint32_t _data
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)
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{
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((struct _OSUnalignedU32 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt32(_data);
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}
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#else
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__DARWIN_OS_INLINE
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void
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OSWriteSwapInt32(
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volatile void * _base,
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uintptr_t _offset,
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uint32_t _data
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)
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{
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((struct _OSUnalignedU32 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt32(_data);
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}
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#endif
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#if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)
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__DARWIN_OS_INLINE
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void
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_OSWriteSwapInt64(
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volatile void * _base,
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uintptr_t _offset,
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uint64_t _data
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)
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{
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((struct _OSUnalignedU64 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt64(_data);
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}
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#else
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__DARWIN_OS_INLINE
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void
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OSWriteSwapInt64(
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volatile void * _base,
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uintptr_t _offset,
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uint64_t _data
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)
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{
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((struct _OSUnalignedU64 *)((uintptr_t)_base + _offset))->__val = _OSSwapInt64(_data);
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}
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#endif
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#endif /* ! _OS_OSBYTEORDERARM_H */
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