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