mirror of https://gitee.com/openkylin/linux.git
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 99, 2003 by Ralf Baechle
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*/
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#ifndef _ASM_SWAB_H
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#define _ASM_SWAB_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#define __SWAB_64_THRU_32__
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#if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) || \
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defined(_MIPS_ARCH_LOONGSON3A)
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static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
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{
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__asm__(
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" .set push \n"
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" .set arch=mips32r2 \n"
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" wsbh %0, %1 \n"
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" .set pop \n"
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: "=r" (x)
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: "r" (x));
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return x;
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}
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#define __arch_swab16 __arch_swab16
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static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
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{
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__asm__(
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" .set push \n"
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" .set arch=mips32r2 \n"
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" wsbh %0, %1 \n"
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" rotr %0, %0, 16 \n"
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" .set pop \n"
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: "=r" (x)
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: "r" (x));
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return x;
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}
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#define __arch_swab32 __arch_swab32
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/*
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* Having already checked for MIPS R2, enable the optimized version for
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* 64-bit kernel on r2 CPUs.
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*/
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#ifdef __mips64
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static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
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{
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__asm__(
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" .set push \n"
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" .set arch=mips64r2 \n"
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" dsbh %0, %1 \n"
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" dshd %0, %0 \n"
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" .set pop \n"
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: "=r" (x)
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: "r" (x));
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return x;
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}
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#define __arch_swab64 __arch_swab64
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#endif /* __mips64 */
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#endif /* MIPS R2 or newer or Loongson 3A */
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#endif /* _ASM_SWAB_H */
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