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Currently the only supported platform for x86_64 is EFI. Building an EFI64 gPXE requires a version of gcc that supports __attribute__((ms_abi)). This currently means a development build of gcc; the feature should be present when gcc 4.4 is released. In the meantime; you can grab a suitable gcc tree from git://git.etherboot.org/scm/people/mcb30/gcc/.git
42 lines
872 B
C
42 lines
872 B
C
#ifndef ETHERBOOT_BITS_BYTESWAP_H
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#define ETHERBOOT_BITS_BYTESWAP_H
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static inline __attribute__ ((always_inline, const)) uint16_t
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__bswap_variable_16(uint16_t x)
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{
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__asm__("xchgb %b0,%h0\n\t"
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: "=q" (x)
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: "0" (x));
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return x;
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}
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static inline __attribute__ ((always_inline, const)) uint32_t
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__bswap_variable_32(uint32_t x)
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{
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__asm__("xchgb %b0,%h0\n\t"
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"rorl $16,%0\n\t"
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"xchgb %b0,%h0"
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: "=q" (x)
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: "0" (x));
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return x;
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}
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static inline __attribute__ ((always_inline, const)) uint64_t
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__bswap_variable_64(uint64_t x)
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{
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union {
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uint64_t qword;
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uint32_t dword[2];
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} u;
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u.qword = x;
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u.dword[0] = __bswap_variable_32(u.dword[0]);
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u.dword[1] = __bswap_variable_32(u.dword[1]);
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__asm__("xchgl %0,%1"
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: "=r" ( u.dword[0] ), "=r" ( u.dword[1] )
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: "0" ( u.dword[0] ), "1" ( u.dword[1] ) );
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return u.qword;
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}
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#endif /* ETHERBOOT_BITS_BYTESWAP_H */
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