File:  [Qemu by Fabrice Bellard] / qemu / bswap.h
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:37:52 2018 UTC (2 years, 2 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0090, qemu0082, qemu0081, qemu0080, qemu0072, HEAD
qemu 0.7.2

    1: #ifndef BSWAP_H
    2: #define BSWAP_H
    3: 
    4: #include "config-host.h"
    5: 
    6: #include <inttypes.h>
    7: 
    8: #ifdef HAVE_BYTESWAP_H
    9: #include <byteswap.h>
   10: #else
   11: 
   12: #define bswap_16(x) \
   13: ({ \
   14: 	uint16_t __x = (x); \
   15: 	((uint16_t)( \
   16: 		(((uint16_t)(__x) & (uint16_t)0x00ffU) << 8) | \
   17: 		(((uint16_t)(__x) & (uint16_t)0xff00U) >> 8) )); \
   18: })
   19: 
   20: #define bswap_32(x) \
   21: ({ \
   22: 	uint32_t __x = (x); \
   23: 	((uint32_t)( \
   24: 		(((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
   25: 		(((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \
   26: 		(((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \
   27: 		(((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) )); \
   28: })
   29: 
   30: #define bswap_64(x) \
   31: ({ \
   32: 	uint64_t __x = (x); \
   33: 	((uint64_t)( \
   34: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000000000ffULL) << 56) | \
   35: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
   36: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
   37: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
   38: 	        (uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
   39: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
   40: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
   41: 		(uint64_t)(((uint64_t)(__x) & (uint64_t)0xff00000000000000ULL) >> 56) )); \
   42: })
   43: 
   44: #endif /* !HAVE_BYTESWAP_H */
   45: 
   46: static inline uint16_t bswap16(uint16_t x)
   47: {
   48:     return bswap_16(x);
   49: }
   50: 
   51: static inline uint32_t bswap32(uint32_t x) 
   52: {
   53:     return bswap_32(x);
   54: }
   55: 
   56: static inline uint64_t bswap64(uint64_t x) 
   57: {
   58:     return bswap_64(x);
   59: }
   60: 
   61: static inline void bswap16s(uint16_t *s)
   62: {
   63:     *s = bswap16(*s);
   64: }
   65: 
   66: static inline void bswap32s(uint32_t *s)
   67: {
   68:     *s = bswap32(*s);
   69: }
   70: 
   71: static inline void bswap64s(uint64_t *s)
   72: {
   73:     *s = bswap64(*s);
   74: }
   75: 
   76: #if defined(WORDS_BIGENDIAN)
   77: #define be_bswap(v, size) (v)
   78: #define le_bswap(v, size) bswap ## size(v)
   79: #define be_bswaps(v, size)
   80: #define le_bswaps(p, size) *p = bswap ## size(*p);
   81: #else
   82: #define le_bswap(v, size) (v)
   83: #define be_bswap(v, size) bswap ## size(v)
   84: #define le_bswaps(v, size)
   85: #define be_bswaps(p, size) *p = bswap ## size(*p);
   86: #endif
   87: 
   88: #define CPU_CONVERT(endian, size, type)\
   89: static inline type endian ## size ## _to_cpu(type v)\
   90: {\
   91:     return endian ## _bswap(v, size);\
   92: }\
   93: \
   94: static inline type cpu_to_ ## endian ## size(type v)\
   95: {\
   96:     return endian ## _bswap(v, size);\
   97: }\
   98: \
   99: static inline void endian ## size ## _to_cpus(type *p)\
  100: {\
  101:     endian ## _bswaps(p, size)\
  102: }\
  103: \
  104: static inline void cpu_to_ ## endian ## size ## s(type *p)\
  105: {\
  106:     endian ## _bswaps(p, size)\
  107: }\
  108: \
  109: static inline type endian ## size ## _to_cpup(const type *p)\
  110: {\
  111:     return endian ## size ## _to_cpu(*p);\
  112: }\
  113: \
  114: static inline void cpu_to_ ## endian ## size ## w(type *p, type v)\
  115: {\
  116:      *p = cpu_to_ ## endian ## size(v);\
  117: }
  118: 
  119: CPU_CONVERT(be, 16, uint16_t)
  120: CPU_CONVERT(be, 32, uint32_t)
  121: CPU_CONVERT(be, 64, uint64_t)
  122: 
  123: CPU_CONVERT(le, 16, uint16_t)
  124: CPU_CONVERT(le, 32, uint32_t)
  125: CPU_CONVERT(le, 64, uint64_t)
  126: 
  127: /* unaligned versions (optimized for frequent unaligned accesses)*/
  128: 
  129: #if defined(__i386__) || defined(__powerpc__)
  130: 
  131: #define cpu_to_le16wu(p, v) cpu_to_le16w(p, v)
  132: #define cpu_to_le32wu(p, v) cpu_to_le32w(p, v)
  133: #define le16_to_cpupu(p) le16_to_cpup(p)
  134: #define le32_to_cpupu(p) le32_to_cpup(p)
  135: 
  136: #define cpu_to_be16wu(p, v) cpu_to_be16w(p, v)
  137: #define cpu_to_be32wu(p, v) cpu_to_be32w(p, v)
  138: 
  139: #else
  140: 
  141: static inline void cpu_to_le16wu(uint16_t *p, uint16_t v)
  142: {
  143:     uint8_t *p1 = (uint8_t *)p;
  144: 
  145:     p1[0] = v;
  146:     p1[1] = v >> 8;
  147: }
  148: 
  149: static inline void cpu_to_le32wu(uint32_t *p, uint32_t v)
  150: {
  151:     uint8_t *p1 = (uint8_t *)p;
  152: 
  153:     p1[0] = v;
  154:     p1[1] = v >> 8;
  155:     p1[2] = v >> 16;
  156:     p1[3] = v >> 24;
  157: }
  158: 
  159: static inline uint16_t le16_to_cpupu(const uint16_t *p)
  160: {
  161:     const uint8_t *p1 = (const uint8_t *)p;
  162:     return p1[0] | (p1[1] << 8);
  163: }
  164: 
  165: static inline uint32_t le32_to_cpupu(const uint32_t *p)
  166: {
  167:     const uint8_t *p1 = (const uint8_t *)p;
  168:     return p1[0] | (p1[1] << 8) | (p1[2] << 16) | (p1[3] << 24);
  169: }
  170: 
  171: static inline void cpu_to_be16wu(uint16_t *p, uint16_t v)
  172: {
  173:     uint8_t *p1 = (uint8_t *)p;
  174: 
  175:     p1[0] = v >> 8;
  176:     p1[1] = v;
  177: }
  178: 
  179: static inline void cpu_to_be32wu(uint32_t *p, uint32_t v)
  180: {
  181:     uint8_t *p1 = (uint8_t *)p;
  182: 
  183:     p1[0] = v >> 24;
  184:     p1[1] = v >> 16;
  185:     p1[2] = v >> 8;
  186:     p1[3] = v;
  187: }
  188: 
  189: #endif
  190: 
  191: #ifdef WORDS_BIGENDIAN
  192: #define cpu_to_32wu cpu_to_be32wu
  193: #else
  194: #define cpu_to_32wu cpu_to_le32wu
  195: #endif
  196: 
  197: #undef le_bswap
  198: #undef be_bswap
  199: #undef le_bswaps
  200: #undef be_bswaps
  201: 
  202: #endif /* BSWAP_H */

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