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- #ifndef ETHERBOOT_BITS_BYTESWAP_H
- #define ETHERBOOT_BITS_BYTESWAP_H
-
- 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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