diff options
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h')
-rw-r--r-- | contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h new file mode 100644 index 0000000..ddbd40e --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h @@ -0,0 +1,43 @@ +#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 */ |