96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __ENDIAN_H
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#define __ENDIAN_H
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#include <sys/types.h>
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN 1234
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#endif
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN 4321
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#endif
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#if __POWERPC__
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#include <ppc_intrinsics.h>
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#endif
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#if defined(ARCH_ARM)
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#define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#ifndef BYTE_ORDER
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#error "need to get the BYTE_ORDER define from somewhere"
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#endif
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// define a macro that unconditionally swaps
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#define SWAP_32(x) \
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(((uint32_t)(x) << 24) | (((uint32_t)(x) & 0xff00) << 8) |(((uint32_t)(x) & 0x00ff0000) >> 8) | ((uint32_t)(x) >> 24))
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#define SWAP_16(x) \
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((((uint16_t)(x) & 0xff) << 8) | ((uint16_t)(x) >> 8))
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// standard swap macros
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#if BYTE_ORDER == BIG_ENDIAN
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#define LE32(val) SWAP_32(val)
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#define LE16(val) SWAP_16(val)
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#define BE32(val) (val)
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#define BE16(val) (val)
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#else
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#define LE32(val) (val)
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#define LE16(val) (val)
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#define BE32(val) SWAP_32(val)
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#define BE16(val) SWAP_16(val)
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#endif
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#define LE32SWAP(var) (var) = LE32(var);
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#define LE16SWAP(var) (var) = LE16(var);
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#define BE32SWAP(var) (var) = BE32(var);
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#define BE16SWAP(var) (var) = BE16(var);
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/* classic network byte swap stuff */
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#define ntohs(n) BE16(n)
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#define htons(h) BE16(h)
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#define ntohl(n) BE32(n)
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#define htonl(h) BE32(h)
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// some memory access macros
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#if __POWERPC__
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#define READ_MEM_WORD(ptr) __lwbrx((word *)(ptr), 0)
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#define READ_MEM_HALFWORD(ptr) __lhbrx((halfword *)(ptr), 0)
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#define READ_MEM_BYTE(ptr) (*(byte *)(ptr))
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#define WRITE_MEM_WORD(ptr, data) __stwbrx(data, (word *)(ptr), 0)
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#define WRITE_MEM_HALFWORD(ptr, data) __sthbrx(data, (halfword *)(ptr), 0)
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#define WRITE_MEM_BYTE(ptr, data) (*(byte *)(ptr) = (data))
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#else
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#define READ_MEM_WORD(ptr) SWAPIT_32(*(word *)(ptr))
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#define READ_MEM_HALFWORD(ptr) SWAPIT_16(*(halfword *)(ptr))
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#define READ_MEM_BYTE(ptr) (*(byte *)(ptr))
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#define WRITE_MEM_WORD(ptr, data) (*(word *)(ptr) = SWAPIT_32(data))
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#define WRITE_MEM_HALFWORD(ptr, data) (*(halfword *)(ptr) = SWAPIT_16(data))
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#define WRITE_MEM_BYTE(ptr, data) (*(byte *)(ptr) = (data))
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#endif
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#endif
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