12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576 |
- #ifndef ETHERBOOT_BITS_BYTESWAP_H
- #define ETHERBOOT_BITS_BYTESWAP_H
-
- static inline __attribute__ ((always_inline, const)) uint16_t
- __i386_bswap_16(uint16_t x)
- {
- __asm__("xchgb %b0,%h0\n\t"
- : "=q" (x)
- : "0" (x));
- return x;
- }
-
- static inline __attribute__ ((always_inline, const)) uint32_t
- __i386_bswap_32(uint32_t x)
- {
- __asm__("xchgb %b0,%h0\n\t"
- "rorl $16,%0\n\t"
- "xchgb %b0,%h0"
- : "=q" (x)
- : "0" (x));
- return x;
- }
-
- static inline __attribute__ ((always_inline, const)) uint64_t
- __i386_bswap_64(uint64_t x)
- {
- union {
- uint64_t qword;
- uint32_t dword[2];
- } u;
-
- u.qword = x;
- u.dword[0] = __i386_bswap_32(u.dword[0]);
- u.dword[1] = __i386_bswap_32(u.dword[1]);
- __asm__("xchgl %0,%1"
- : "=r" ( u.dword[0] ), "=r" ( u.dword[1] )
- : "0" ( u.dword[0] ), "1" ( u.dword[1] ) );
- return u.qword;
- }
-
- #define __bswap_constant_16(x) \
- ((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
- (((uint16_t)(x) & 0xff00) >> 8)))
-
- #define __bswap_constant_32(x) \
- ((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
- (((uint32_t)(x) & 0x0000ff00U) << 8) | \
- (((uint32_t)(x) & 0x00ff0000U) >> 8) | \
- (((uint32_t)(x) & 0xff000000U) >> 24)))
-
- #define __bswap_constant_64(x) \
- ((uint64_t)((((uint64_t)(x) & 0x00000000000000ffULL) << 56) | \
- (((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
- (((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
- (((uint64_t)(x) & 0x00000000ff000000ULL) << 8) | \
- (((uint64_t)(x) & 0x000000ff00000000ULL) >> 8) | \
- (((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
- (((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
- (((uint64_t)(x) & 0xff00000000000000ULL) >> 56)))
-
- #define __bswap_16(x) \
- ((uint16_t)(__builtin_constant_p(x) ? \
- __bswap_constant_16(x) : \
- __i386_bswap_16(x)))
-
- #define __bswap_32(x) \
- ((uint32_t)(__builtin_constant_p(x) ? \
- __bswap_constant_32(x) : \
- __i386_bswap_32(x)))
-
- #define __bswap_64(x) \
- ((uint64_t)(__builtin_constant_p(x) ? \
- __bswap_constant_64(x) : \
- __i386_bswap_64(x)))
-
- #endif /* ETHERBOOT_BITS_BYTESWAP_H */
|