payloads/libpayload/include/endian.h

   1 /*
   2  *
   3  * Copyright (c) 2012 The ChromiumOS Authors.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef _ENDIAN_H_
  30 #define _ENDIAN_H_
  31
  32 #include <arch/io.h>
  33 #include <arch/types.h>
  34 #include <libpayload-config.h>
  35
  36 /* Endian functions from glibc 2.9 / BSD "endian.h" */
  37
  38 #if CONFIG(LP_BIG_ENDIAN)
  39
  40 #define htobe16(in) (in)
  41 #define htobe32(in) (in)
  42 #define htobe64(in) (in)
  43
  44 #define htole16(in) ((uint16_t)__builtin_bswap16(in))
  45 #define htole32(in) ((uint32_t)__builtin_bswap32(in))
  46 #define htole64(in) ((uint64_t)__builtin_bswap64(in))
  47
  48 #elif CONFIG(LP_LITTLE_ENDIAN)
  49
  50 #define htobe16(in) ((uint16_t)__builtin_bswap16(in))
  51 #define htobe32(in) ((uint32_t)__builtin_bswap32(in))
  52 #define htobe64(in) ((uint64_t)__builtin_bswap64(in))
  53
  54 #define htole16(in) (in)
  55 #define htole32(in) (in)
  56 #define htole64(in) (in)
  57
  58 #else
  59
  60 #error Cant tell if the CPU is little or big endian.
  61
  62 #endif /* CONFIG_*_ENDIAN */
  63
  64 #define be16toh(in) htobe16(in)
  65 #define be32toh(in) htobe32(in)
  66 #define be64toh(in) htobe64(in)
  67
  68 #define le16toh(in) htole16(in)
  69 #define le32toh(in) htole32(in)
  70 #define le64toh(in) htole64(in)
  71
  72 #define htonw(in) htobe16(in)
  73 #define htonl(in) htobe32(in)
  74 #define htonll(in) htobe64(in)
  75
  76 #define ntohw(in) be16toh(in)
  77 #define ntohl(in) be32toh(in)
  78 #define ntohll(in) be64toh(in)
  79
  80 /*
  81  * Alignment-agnostic encode/decode bytestream to/from little/big endian.
  82  */
  83
  84 static inline uint16_t be16dec(const void *pp)
  85 {
  86         uint8_t const *p = (uint8_t const *)pp;
  87
  88         return (uint16_t)((p[0] << 8) | p[1]);
  89 }
  90
  91 static inline uint32_t be32dec(const void *pp)
  92 {
  93         uint8_t const *p = (uint8_t const *)pp;
  94
  95         return (((uint32_t)p[0] << 24) | (uint32_t)(p[1] << 16) |
  96                 (uint32_t)(p[2] << 8) | p[3]);
  97 }
  98
  99 static inline uint16_t le16dec(const void *pp)
 100 {
 101         uint8_t const *p = (uint8_t const *)pp;
 102
 103         return (uint16_t)((p[1] << 8) | p[0]);
 104 }
 105
 106 static inline uint32_t le32dec(const void *pp)
 107 {
 108         uint8_t const *p = (uint8_t const *)pp;
 109
 110         return ((uint32_t)(p[3] << 24) | (uint32_t)(p[2] << 16) |
 111                 (uint32_t)(p[1] << 8) | p[0]);
 112 }
 113
 114 static inline void bebitenc(void *pp, uint32_t u, uint8_t b)
 115 {
 116         uint8_t *p = (uint8_t *)pp;
 117         int i;
 118
 119         for (i = 0; i < b; i++)
 120                 p[(b - 1) - i] = (u >> i*8) & 0xFF;
 121 }
 122
 123 static inline void be16enc(void *pp, uint16_t u)
 124 {
 125         bebitenc(pp, u, 2);
 126 }
 127
 128 static inline void be32enc(void *pp, uint32_t u)
 129 {
 130         bebitenc(pp, u, 4);
 131 }
 132
 133 static inline void lebitenc(void *pp, uint32_t u, uint8_t b)
 134 {
 135         uint8_t *p = (uint8_t *)pp;
 136         int i;
 137
 138         for (i = 0; i < b; i++)
 139                 p[i] = (u >> i*8) & 0xFF;
 140 }
 141
 142 static inline void le16enc(void *pp, uint16_t u)
 143 {
 144         lebitenc(pp, u, 2);
 145 }
 146
 147 static inline void le32enc(void *pp, uint32_t u)
 148 {
 149         lebitenc(pp, u, 4);
 150 }
 151
 152 /* Deprecated names (not in glibc / BSD) */
 153 #define htobew(in) htobe16(in)
 154 #define htobel(in) htobe32(in)
 155 #define htobell(in) htobe64(in)
 156 #define htolew(in) htole16(in)
 157 #define htolel(in) htole32(in)
 158 #define htolell(in) htole64(in)
 159 #define betohw(in) be16toh(in)
 160 #define betohl(in) be32toh(in)
 161 #define betohll(in) be64toh(in)
 162 #define letohw(in) le16toh(in)
 163 #define letohl(in) le32toh(in)
 164 #define letohll(in) le64toh(in)
 165
 166 /* Handy bit manipulation macros */
 167
 168 #define __clrsetbits(endian, bits, addr, clear, set) \
 169         write##bits(addr, hto##endian##bits((endian##bits##toh( \
 170                 read##bits(addr)) & ~((uint##bits##_t)(clear))) | (set)))
 171
 172 #define clrbits_le64(addr, clear)       __clrsetbits(le, 64, addr, clear, 0)
 173 #define clrbits_be64(addr, clear)       __clrsetbits(be, 64, addr, clear, 0)
 174 #define clrbits_le32(addr, clear)       __clrsetbits(le, 32, addr, clear, 0)
 175 #define clrbits_be32(addr, clear)       __clrsetbits(be, 32, addr, clear, 0)
 176 #define clrbits_le16(addr, clear)       __clrsetbits(le, 16, addr, clear, 0)
 177 #define clrbits_be16(addr, clear)       __clrsetbits(be, 16, addr, clear, 0)
 178
 179 #define setbits_le64(addr, set)         __clrsetbits(le, 64, addr, 0, set)
 180 #define setbits_be64(addr, set)         __clrsetbits(be, 64, addr, 0, set)
 181 #define setbits_le32(addr, set)         __clrsetbits(le, 32, addr, 0, set)
 182 #define setbits_be32(addr, set)         __clrsetbits(be, 32, addr, 0, set)
 183 #define setbits_le16(addr, set)         __clrsetbits(le, 16, addr, 0, set)
 184 #define setbits_be16(addr, set)         __clrsetbits(be, 16, addr, 0, set)
 185
 186 #define clrsetbits_le64(addr, clear, set) __clrsetbits(le, 64, addr, clear, set)
 187 #define clrsetbits_be64(addr, clear, set) __clrsetbits(be, 64, addr, clear, set)
 188 #define clrsetbits_le32(addr, clear, set) __clrsetbits(le, 32, addr, clear, set)
 189 #define clrsetbits_be32(addr, clear, set) __clrsetbits(be, 32, addr, clear, set)
 190 #define clrsetbits_le16(addr, clear, set) __clrsetbits(le, 16, addr, clear, set)
 191 #define clrsetbits_be16(addr, clear, set) __clrsetbits(be, 16, addr, clear, set)
 192
 193 #define __clrsetbits_impl(bits, addr, clear, set) write##bits(addr, \
 194         (read##bits(addr) & ~((uint##bits##_t)(clear))) | (set))
 195
 196 #define clrsetbits8(addr, clear, set)   __clrsetbits_impl(8, addr, clear, set)
 197 #define clrsetbits16(addr, clear, set)  __clrsetbits_impl(16, addr, clear, set)
 198 #define clrsetbits32(addr, clear, set)  __clrsetbits_impl(32, addr, clear, set)
 199 #define clrsetbits64(addr, clear, set)  __clrsetbits_impl(64, addr, clear, set)
 200
 201 #define setbits8(addr, set)             clrsetbits8(addr, 0, set)
 202 #define setbits16(addr, set)            clrsetbits16(addr, 0, set)
 203 #define setbits32(addr, set)            clrsetbits32(addr, 0, set)
 204 #define setbits64(addr, set)            clrsetbits64(addr, 0, set)
 205
 206 #define clrbits8(addr, clear)           clrsetbits8(addr, clear, 0)
 207 #define clrbits16(addr, clear)          clrsetbits16(addr, clear, 0)
 208 #define clrbits32(addr, clear)          clrsetbits32(addr, clear, 0)
 209 #define clrbits64(addr, clear)          clrsetbits64(addr, clear, 0)
 210
 211 #endif /* _ENDIAN_H_ */