ipxe/src/arch/x86_64/include/bits/byteswap.h

#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H

/** @file
 *
 * Byte-order swapping functions
 *
 */

#include <stdint.h>

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

static inline __attribute__ (( always_inline, const )) uint16_t
__bswap_variable_16 ( uint16_t x ) {
	__asm__ ( "xchgb %b0,%h0" : "=Q" ( x ) : "0" ( x ) );
	return x;
}

static inline __attribute__ (( always_inline )) void
__bswap_16s ( uint16_t *x ) {
	__asm__ ( "rorw $8, %0" : "+m" ( *x ) );
}

static inline __attribute__ (( always_inline, const )) uint32_t
__bswap_variable_32 ( uint32_t x ) {
	__asm__ ( "bswapl %k0" : "=r" ( x ) : "0" ( 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
__bswap_variable_64 ( uint64_t x ) {
	__asm__ ( "bswapq %q0" : "=r" ( x ) : "0" ( 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 */