1 #ifndef ETHERBOOT_BITS_BYTESWAP_H 2 #define ETHERBOOT_BITS_BYTESWAP_H 3 4 #include "types.h" 5 static inline uint16_t __i386_bswap_16(uint16_t x) 6 { 7 __asm__("xchgb %b0,%h0\n\t" 8 : "=q" (x) 9 : "0" (x)); 10 return x; 11 } 12 13 static inline uint32_t __i386_bswap_32(uint32_t x) 14 { 15 __asm__("xchgb %b0,%h0\n\t" 16 "rorl $16,%0\n\t" 17 "xchgb %b0,%h0" 18 : "=q" (x) 19 : "0" (x)); 20 return x; 21 } 22 23 24 #define __bswap_constant_16(x) \ 25 ((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \ 26 (((uint16_t)(x) & 0xff00) >> 8))) 27 28 #define __bswap_constant_32(x) \ 29 ((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \ 30 (((uint32_t)(x) & 0x0000ff00U) << 8) | \ 31 (((uint32_t)(x) & 0x00ff0000U) >> 8) | \ 32 (((uint32_t)(x) & 0xff000000U) >> 24))) 33 34 #define __bswap_16(x) \ 35 (__builtin_constant_p(x) ? \ 36 __bswap_constant_16(x) : \ 37 __i386_bswap_16(x)) 38 39 40 #define __bswap_32(x) \ 41 (__builtin_constant_p(x) ? \ 42 __bswap_constant_32(x) : \ 43 __i386_bswap_32(x)) 44 45 46 #endif /* ETHERBOOT_BITS_BYTESWAP_H */ 47