212 lines
6.8 KiB
C
212 lines
6.8 KiB
C
/*
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*
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* Copyright (c) 2012 The ChromiumOS Authors.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ENDIAN_H_
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#define _ENDIAN_H_
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#include <arch/io.h>
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#include <arch/types.h>
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#include <libpayload-config.h>
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/* Endian functions from glibc 2.9 / BSD "endian.h" */
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#if CONFIG(LP_BIG_ENDIAN)
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#define htobe16(in) (in)
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#define htobe32(in) (in)
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#define htobe64(in) (in)
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#define htole16(in) ((uint16_t)__builtin_bswap16(in))
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#define htole32(in) ((uint32_t)__builtin_bswap32(in))
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#define htole64(in) ((uint64_t)__builtin_bswap64(in))
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#elif CONFIG(LP_LITTLE_ENDIAN)
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#define htobe16(in) ((uint16_t)__builtin_bswap16(in))
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#define htobe32(in) ((uint32_t)__builtin_bswap32(in))
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#define htobe64(in) ((uint64_t)__builtin_bswap64(in))
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#define htole16(in) (in)
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#define htole32(in) (in)
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#define htole64(in) (in)
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#else
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#error Cant tell if the CPU is little or big endian.
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#endif /* CONFIG_*_ENDIAN */
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#define be16toh(in) htobe16(in)
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#define be32toh(in) htobe32(in)
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#define be64toh(in) htobe64(in)
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#define le16toh(in) htole16(in)
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#define le32toh(in) htole32(in)
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#define le64toh(in) htole64(in)
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#define htonw(in) htobe16(in)
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#define htonl(in) htobe32(in)
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#define htonll(in) htobe64(in)
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#define ntohw(in) be16toh(in)
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#define ntohl(in) be32toh(in)
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#define ntohll(in) be64toh(in)
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/*
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* Alignment-agnostic encode/decode bytestream to/from little/big endian.
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*/
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static inline uint16_t be16dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (uint16_t)((p[0] << 8) | p[1]);
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}
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static inline uint32_t be32dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (((uint32_t)p[0] << 24) | (uint32_t)(p[1] << 16) |
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(uint32_t)(p[2] << 8) | p[3]);
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}
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static inline uint16_t le16dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (uint16_t)((p[1] << 8) | p[0]);
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}
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static inline uint32_t le32dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return ((uint32_t)(p[3] << 24) | (uint32_t)(p[2] << 16) |
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(uint32_t)(p[1] << 8) | p[0]);
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}
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static inline void bebitenc(void *pp, uint32_t u, uint8_t b)
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{
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uint8_t *p = (uint8_t *)pp;
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int i;
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for (i = 0; i < b; i++)
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p[(b - 1) - i] = (u >> i*8) & 0xFF;
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}
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static inline void be16enc(void *pp, uint16_t u)
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{
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bebitenc(pp, u, 2);
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}
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static inline void be32enc(void *pp, uint32_t u)
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{
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bebitenc(pp, u, 4);
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}
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static inline void lebitenc(void *pp, uint32_t u, uint8_t b)
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{
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uint8_t *p = (uint8_t *)pp;
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int i;
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for (i = 0; i < b; i++)
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p[i] = (u >> i*8) & 0xFF;
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}
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static inline void le16enc(void *pp, uint16_t u)
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{
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lebitenc(pp, u, 2);
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}
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static inline void le32enc(void *pp, uint32_t u)
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{
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lebitenc(pp, u, 4);
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}
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/* Deprecated names (not in glibc / BSD) */
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#define htobew(in) htobe16(in)
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#define htobel(in) htobe32(in)
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#define htobell(in) htobe64(in)
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#define htolew(in) htole16(in)
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#define htolel(in) htole32(in)
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#define htolell(in) htole64(in)
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#define betohw(in) be16toh(in)
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#define betohl(in) be32toh(in)
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#define betohll(in) be64toh(in)
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#define letohw(in) le16toh(in)
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#define letohl(in) le32toh(in)
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#define letohll(in) le64toh(in)
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/* Handy bit manipulation macros */
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#define __clrsetbits(endian, bits, addr, clear, set) \
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write##bits(addr, hto##endian##bits((endian##bits##toh( \
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read##bits(addr)) & ~((uint##bits##_t)(clear))) | (set)))
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#define clrbits_le64(addr, clear) __clrsetbits(le, 64, addr, clear, 0)
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#define clrbits_be64(addr, clear) __clrsetbits(be, 64, addr, clear, 0)
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#define clrbits_le32(addr, clear) __clrsetbits(le, 32, addr, clear, 0)
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#define clrbits_be32(addr, clear) __clrsetbits(be, 32, addr, clear, 0)
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#define clrbits_le16(addr, clear) __clrsetbits(le, 16, addr, clear, 0)
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#define clrbits_be16(addr, clear) __clrsetbits(be, 16, addr, clear, 0)
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#define setbits_le64(addr, set) __clrsetbits(le, 64, addr, 0, set)
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#define setbits_be64(addr, set) __clrsetbits(be, 64, addr, 0, set)
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#define setbits_le32(addr, set) __clrsetbits(le, 32, addr, 0, set)
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#define setbits_be32(addr, set) __clrsetbits(be, 32, addr, 0, set)
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#define setbits_le16(addr, set) __clrsetbits(le, 16, addr, 0, set)
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#define setbits_be16(addr, set) __clrsetbits(be, 16, addr, 0, set)
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#define clrsetbits_le64(addr, clear, set) __clrsetbits(le, 64, addr, clear, set)
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#define clrsetbits_be64(addr, clear, set) __clrsetbits(be, 64, addr, clear, set)
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#define clrsetbits_le32(addr, clear, set) __clrsetbits(le, 32, addr, clear, set)
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#define clrsetbits_be32(addr, clear, set) __clrsetbits(be, 32, addr, clear, set)
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#define clrsetbits_le16(addr, clear, set) __clrsetbits(le, 16, addr, clear, set)
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#define clrsetbits_be16(addr, clear, set) __clrsetbits(be, 16, addr, clear, set)
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#define __clrsetbits_impl(bits, addr, clear, set) write##bits(addr, \
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(read##bits(addr) & ~((uint##bits##_t)(clear))) | (set))
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#define clrsetbits8(addr, clear, set) __clrsetbits_impl(8, addr, clear, set)
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#define clrsetbits16(addr, clear, set) __clrsetbits_impl(16, addr, clear, set)
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#define clrsetbits32(addr, clear, set) __clrsetbits_impl(32, addr, clear, set)
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#define clrsetbits64(addr, clear, set) __clrsetbits_impl(64, addr, clear, set)
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#define setbits8(addr, set) clrsetbits8(addr, 0, set)
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#define setbits16(addr, set) clrsetbits16(addr, 0, set)
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#define setbits32(addr, set) clrsetbits32(addr, 0, set)
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#define setbits64(addr, set) clrsetbits64(addr, 0, set)
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#define clrbits8(addr, clear) clrsetbits8(addr, clear, 0)
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#define clrbits16(addr, clear) clrsetbits16(addr, clear, 0)
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#define clrbits32(addr, clear) clrsetbits32(addr, clear, 0)
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#define clrbits64(addr, clear) clrsetbits64(addr, clear, 0)
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#endif /* _ENDIAN_H_ */
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