forked from Imagelibrary/rtems
30337d2a30
* shared/include/byteorder.h: Use unsigned instead of __unsigned (GCC-3.0.x compatibility).
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* byteorder.h
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*
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* This file contains inline implementation of function to
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* deal with endian conversion.
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*
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* It is a stripped down version of linux ppc file...
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*
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* Copyright (C) 1999 Eric Valette (valette@crf.canon.fr)
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* Canon Centre Recherche France.
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*
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* The license and distribution terms for this file may be
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* found in found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id$
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*/
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#ifndef _PPC_BYTEORDER_H
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#define _PPC_BYTEORDER_H
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#ifdef __GNUC__
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extern __inline__ unsigned ld_le16(volatile unsigned short *addr)
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{
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unsigned 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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extern __inline__ void st_le16(volatile unsigned short *addr, unsigned 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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extern __inline__ unsigned ld_le32(volatile unsigned *addr)
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{
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unsigned 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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extern __inline__ void st_le32(volatile unsigned *addr, unsigned 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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/* alas, egcs sounds like it has a bug in this code that doesn't use the
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inline asm correctly, and can cause file corruption. Until I hear that
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it's fixed, I can live without the extra speed. I hope. */
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#if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90)
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#if 0
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# define __arch_swab16(x) ld_le16(&x)
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# define __arch_swab32(x) ld_le32(&x)
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#else
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static __inline__ __const__ unsigned short ___arch__swab16(unsigned short value)
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{
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unsigned int tmp;
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__asm__("rlwimi %0,%0,8,0xff0000"
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: "=r" (tmp)
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: "0" (value));
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return (tmp&0x00ffff00)>>8;
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}
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static __inline__ __const__ unsigned int ___arch__swab32(unsigned int value)
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{
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unsigned int result;
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__asm__("rotlwi %0,%1,24\n\t"
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"rlwimi %0,%1,8,0xff\n\t"
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"rlwimi %0,%1,8,0xff0000"
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: "=&r" (result)
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: "r" (value));
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return result;
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}
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#define __arch__swab32(x) ___arch__swab32(x)
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#define __arch__swab16(x) ___arch__swab16(x)
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#endif /* 0 */
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#endif
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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 /* __GNUC__ */
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#endif /* _PPC_BYTEORDER_H */
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