60 строки
1.3 KiB
C
60 строки
1.3 KiB
C
#ifndef _I386_BYTEORDER_H
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#define _I386_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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/* For avoiding bswap on i386 */
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#ifdef __KERNEL__
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#include <linux/config.h>
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#endif
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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 { __u32 a,b; } 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" : "=r" (v.s.a), "=r" (v.s.b) : "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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/* 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 /* _I386_BYTEORDER_H */
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