mirror of https://gitee.com/openkylin/linux.git
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
#ifndef _ASM_X86_SWAB_H
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#define _ASM_X86_SWAB_H
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#include <asm/types.h>
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#include <linux/compiler.h>
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static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
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{
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#ifdef __i386__
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# ifdef CONFIG_X86_BSWAP
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asm("bswap %0" : "=r" (val) : "0" (val));
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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" (val)
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: "0" (val));
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# endif
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#else /* __i386__ */
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asm("bswapl %0"
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: "=r" (val)
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: "0" (val));
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#endif
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return val;
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}
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#define __arch_swab32 __arch_swab32
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static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
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{
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#ifdef __i386__
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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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#else /* __i386__ */
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asm("bswapq %0"
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: "=r" (val)
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: "0" (val));
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return val;
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#endif
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}
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#define __arch_swab64 __arch_swab64
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#endif /* _ASM_X86_SWAB_H */
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