12822bc272
This patch cleans up asm-ppc64/byteorder.h to enable ___arch__swab16 and ___arch__swab32 which are marked TODO currently. It removes ___arch__swab64 because ppc64 does not have short instruction combinations for swab64, the recent gcc generates enough smart code that is equivalent to hand assembled code under my tests. Signed-off-by: GOTO Masanori <gotom@debian.or.jp> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#ifndef _PPC64_BYTEORDER_H
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#define _PPC64_BYTEORDER_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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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 __KERNEL__
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static __inline__ __u16 ld_le16(const volatile __u16 *addr)
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{
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__u16 val;
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__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
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return val;
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}
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static __inline__ void st_le16(volatile __u16 *addr, const __u16 val)
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{
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__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
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}
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static __inline__ __u32 ld_le32(const volatile __u32 *addr)
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{
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__u32 val;
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__asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
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return val;
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}
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static __inline__ void st_le32(volatile __u32 *addr, const __u32 val)
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{
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__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
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}
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static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 value)
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{
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__u16 result;
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__asm__("rlwimi %0,%1,8,16,23"
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: "=r" (result)
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: "r" (value), "0" (value >> 8));
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return result;
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}
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static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 value)
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{
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__u32 result;
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__asm__("rlwimi %0,%1,24,16,23\n\t"
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"rlwimi %0,%1,8,8,15\n\t"
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"rlwimi %0,%1,24,0,7"
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: "=r" (result)
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: "r" (value), "0" (value >> 24));
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return result;
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}
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#define __arch__swab16(x) ___arch__swab16(x)
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#define __arch__swab32(x) ___arch__swab32(x)
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/* The same, but returns converted value from the location pointer by addr. */
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#define __arch__swab16p(addr) ld_le16(addr)
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#define __arch__swab32p(addr) ld_le32(addr)
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/* The same, but do the conversion in situ, ie. put the value back to addr. */
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#define __arch__swab16s(addr) st_le16(addr,*addr)
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#define __arch__swab32s(addr) st_le32(addr,*addr)
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#endif /* __KERNEL__ */
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#ifndef __STRICT_ANSI__
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#define __BYTEORDER_HAS_U64__
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#endif
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#endif /* __GNUC__ */
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#include <linux/byteorder/big_endian.h>
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#endif /* _PPC64_BYTEORDER_H */
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