mirror of https://github.com/ipxe/ipxe.git
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
#ifndef ETHERBOOT_BITS_BYTESWAP_H
|
|
#define ETHERBOOT_BITS_BYTESWAP_H
|
|
|
|
static inline __attribute__ ((always_inline, const)) uint16_t
|
|
__i386_bswap_16(uint16_t x)
|
|
{
|
|
__asm__("xchgb %b0,%h0\n\t"
|
|
: "=q" (x)
|
|
: "0" (x));
|
|
return x;
|
|
}
|
|
|
|
static inline __attribute__ ((always_inline, const)) uint32_t
|
|
__i386_bswap_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
|
|
__i386_bswap_64(uint64_t x)
|
|
{
|
|
union {
|
|
uint64_t qword;
|
|
uint32_t dword[2];
|
|
} u;
|
|
|
|
u.qword = x;
|
|
u.dword[0] = __i386_bswap_32(u.dword[0]);
|
|
u.dword[1] = __i386_bswap_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;
|
|
}
|
|
|
|
#define __bswap_constant_16(x) \
|
|
((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
|
|
(((uint16_t)(x) & 0xff00) >> 8)))
|
|
|
|
#define __bswap_constant_32(x) \
|
|
((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
|
|
(((uint32_t)(x) & 0x0000ff00U) << 8) | \
|
|
(((uint32_t)(x) & 0x00ff0000U) >> 8) | \
|
|
(((uint32_t)(x) & 0xff000000U) >> 24)))
|
|
|
|
#define __bswap_constant_64(x) \
|
|
((uint64_t)((((uint64_t)(x) & 0x00000000000000ffULL) << 56) | \
|
|
(((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
|
|
(((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
|
|
(((uint64_t)(x) & 0x00000000ff000000ULL) << 8) | \
|
|
(((uint64_t)(x) & 0x000000ff00000000ULL) >> 8) | \
|
|
(((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
|
|
(((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
|
|
(((uint64_t)(x) & 0xff00000000000000ULL) >> 56)))
|
|
|
|
#define __bswap_16(x) \
|
|
((uint16_t)(__builtin_constant_p(x) ? \
|
|
__bswap_constant_16(x) : \
|
|
__i386_bswap_16(x)))
|
|
|
|
#define __bswap_32(x) \
|
|
((uint32_t)(__builtin_constant_p(x) ? \
|
|
__bswap_constant_32(x) : \
|
|
__i386_bswap_32(x)))
|
|
|
|
#define __bswap_64(x) \
|
|
((uint64_t)(__builtin_constant_p(x) ? \
|
|
__bswap_constant_64(x) : \
|
|
__i386_bswap_64(x)))
|
|
|
|
#endif /* ETHERBOOT_BITS_BYTESWAP_H */
|