82 строки
1.5 KiB
C
82 строки
1.5 KiB
C
#ifndef _ASM_X86_BYTEORDER_H
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#define _ASM_X86_BYTEORDER_H
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#include <asm/types.h>
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#include <linux/compiler.h>
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#ifdef __GNUC__
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#ifdef __i386__
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static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
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{
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#ifdef CONFIG_X86_BSWAP
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asm("bswap %0" : "=r" (x) : "0" (x));
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#else
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asm("xchgb %b0,%h0\n\t" /* swap lower bytes */
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"rorl $16,%0\n\t" /* swap words */
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"xchgb %b0,%h0" /* swap higher bytes */
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: "=q" (x)
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: "0" (x));
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#endif
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return x;
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}
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static inline __attribute_const__ __u64 ___arch__swab64(__u64 val)
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{
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union {
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struct {
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__u32 a;
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__u32 b;
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} s;
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__u64 u;
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} v;
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v.u = val;
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#ifdef CONFIG_X86_BSWAP
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asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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: "=r" (v.s.a), "=r" (v.s.b)
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: "0" (v.s.a), "1" (v.s.b));
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#else
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v.s.a = ___arch__swab32(v.s.a);
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v.s.b = ___arch__swab32(v.s.b);
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asm("xchgl %0,%1"
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: "=r" (v.s.a), "=r" (v.s.b)
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: "0" (v.s.a), "1" (v.s.b));
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#endif
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return v.u;
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}
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#else /* __i386__ */
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static inline __attribute_const__ __u64 ___arch__swab64(__u64 x)
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{
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asm("bswapq %0"
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: "=r" (x)
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: "0" (x));
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return x;
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}
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static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
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{
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asm("bswapl %0"
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: "=r" (x)
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: "0" (x));
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return x;
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}
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#endif
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/* Do not define swab16. Gcc is smart enough to recognize "C" version and
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convert it into rotation or exhange. */
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#define __arch__swab64(x) ___arch__swab64(x)
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#define __arch__swab32(x) ___arch__swab32(x)
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#define __BYTEORDER_HAS_U64__
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#endif /* __GNUC__ */
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#include <linux/byteorder/little_endian.h>
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#endif /* _ASM_X86_BYTEORDER_H */
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