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[x86_64] Provide __bswap_{16,32,64}s() 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/6/head
Michael Brown 2012-03-04 15:28:44 +00:00
parent af96c4151c
commit 249a833ed4
1 changed files with 25 additions and 0 deletions
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25
src/arch/x86_64/include/bits/byteswap.h
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@ -1,22 +1,47 @@
#ifndef _BITS_BYTESWAP_H #ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H #define _BITS_BYTESWAP_H
/** @file
*
* Byte-order swapping functions
*
*/
#include <stdint.h>
FILE_LICENCE ( GPL2_OR_LATER );
static inline __attribute__ (( always_inline, const )) uint16_t static inline __attribute__ (( always_inline, const )) uint16_t
__bswap_variable_16 ( uint16_t x ) { __bswap_variable_16 ( uint16_t x ) {
__asm__ ( "xchgb %b0,%h0" : "=Q" ( x ) : "0" ( x ) ); __asm__ ( "xchgb %b0,%h0" : "=Q" ( x ) : "0" ( x ) );
return x; return x;
} }
static inline __attribute__ (( always_inline )) void
__bswap_16s ( uint16_t *x ) {
__asm__ ( "rorw $8, %0" : "=g" ( *x ) : "0" ( *x ) );
}
static inline __attribute__ (( always_inline, const )) uint32_t static inline __attribute__ (( always_inline, const )) uint32_t
__bswap_variable_32 ( uint32_t x ) { __bswap_variable_32 ( uint32_t x ) {
__asm__ ( "bswapl %k0" : "=r" ( x ) : "0" ( x ) ); __asm__ ( "bswapl %k0" : "=r" ( x ) : "0" ( x ) );
return x; return x;
} }
static inline __attribute__ (( always_inline )) void
__bswap_32s ( uint32_t *x ) {
__asm__ ( "bswapl %k0" : "=r" ( *x ) : "0" ( *x ) );
}
static inline __attribute__ (( always_inline, const )) uint64_t static inline __attribute__ (( always_inline, const )) uint64_t
__bswap_variable_64 ( uint64_t x ) { __bswap_variable_64 ( uint64_t x ) {
__asm__ ( "bswapq %q0" : "=r" ( x ) : "0" ( x ) ); __asm__ ( "bswapq %q0" : "=r" ( x ) : "0" ( x ) );
return x; return x;
} }
static inline __attribute__ (( always_inline )) void
__bswap_64s ( uint64_t *x ) {
__asm__ ( "bswapq %q0" : "=r" ( *x ) : "0" ( *x ) );
}
#endif /* _BITS_BYTESWAP_H */ #endif /* _BITS_BYTESWAP_H */