46 lines
965 B
C
46 lines
965 B
C
#ifndef ETHERBOOT_BITS_BYTESWAP_H
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#define ETHERBOOT_BITS_BYTESWAP_H
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static inline uint16_t __i386_bswap_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 uint32_t __i386_bswap_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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#define __bswap_constant_16(x) \
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((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
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(((uint16_t)(x) & 0xff00) >> 8)))
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#define __bswap_constant_32(x) \
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((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
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(((uint32_t)(x) & 0x0000ff00U) << 8) | \
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(((uint32_t)(x) & 0x00ff0000U) >> 8) | \
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(((uint32_t)(x) & 0xff000000U) >> 24)))
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#define __bswap_16(x) \
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((uint16_t)(__builtin_constant_p(x) ? \
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__bswap_constant_16(x) : \
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__i386_bswap_16(x)))
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#define __bswap_32(x) \
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((uint32_t)(__builtin_constant_p(x) ? \
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__bswap_constant_32(x) : \
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__i386_bswap_32(x)))
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#endif /* ETHERBOOT_BITS_BYTESWAP_H */
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