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#ifndef ETHERBOOT_BITS_BYTESWAP_H
#define ETHERBOOT_BITS_BYTESWAP_H
FILE_LICENCE ( GPL2_OR_LATER );
static inline __attribute__ ((always_inline, const)) uint16_t
__bswap_variable_16(uint16_t x)
{
__asm__("xchgb %b0,%h0\n\t"
: "=q" (x)
: "0" (x));
return x;
}
static inline __attribute__ ((always_inline, const)) uint32_t
__bswap_variable_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
__bswap_variable_64(uint64_t x)
{
union {
uint64_t qword;
uint32_t dword[2];
} u;
u.qword = x;
u.dword[0] = __bswap_variable_32(u.dword[0]);
u.dword[1] = __bswap_variable_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;
}
#endif /* ETHERBOOT_BITS_BYTESWAP_H */
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