1 #ifndef _BITS_BYTESWAP_H 2 #define _BITS_BYTESWAP_H 3 4 /** @file 5 * 6 * Byte-order swapping functions 7 * 8 */ 9 10 #include <stdint.h> 11 12 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); 13 14 static inline __attribute__ (( always_inline, const )) uint16_t __bswap_variable_16(uint16_t x)15__bswap_variable_16 ( uint16_t x ) { 16 __asm__ ( "rev16 %0, %1" : "=l" ( x ) : "l" ( x ) ); 17 return x; 18 } 19 20 static inline __attribute__ (( always_inline )) void __bswap_16s(uint16_t * x)21__bswap_16s ( uint16_t *x ) { 22 *x = __bswap_variable_16 ( *x ); 23 } 24 25 static inline __attribute__ (( always_inline, const )) uint32_t __bswap_variable_32(uint32_t x)26__bswap_variable_32 ( uint32_t x ) { 27 __asm__ ( "rev %0, %1" : "=l" ( x ) : "l" ( x ) ); 28 return x; 29 } 30 31 static inline __attribute__ (( always_inline )) void __bswap_32s(uint32_t * x)32__bswap_32s ( uint32_t *x ) { 33 *x = __bswap_variable_32 ( *x ); 34 } 35 36 static inline __attribute__ (( always_inline, const )) uint64_t __bswap_variable_64(uint64_t x)37__bswap_variable_64 ( uint64_t x ) { 38 uint32_t in_high = ( x >> 32 ); 39 uint32_t in_low = ( x & 0xffffffffUL ); 40 uint32_t out_high = __bswap_variable_32 ( in_low ); 41 uint32_t out_low = __bswap_variable_32 ( in_high ); 42 43 return ( ( ( ( uint64_t ) out_high ) << 32 ) | 44 ( ( uint64_t ) out_low ) ); 45 } 46 47 static inline __attribute__ (( always_inline )) void __bswap_64s(uint64_t * x)48__bswap_64s ( uint64_t *x ) { 49 *x = __bswap_variable_64 ( *x ); 50 } 51 52 #endif 53