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This commit is contained in:
Joel Sherrill
2000-06-14 15:39:53 +00:00
parent 0a18747e56
commit ddbaa1ef6e
1 changed files with 0 additions and 99 deletions
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99
c/src/lib/libcpu/powerpc/shared/byteorder.h
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/*
* byteorder.h
*
* This file contains inline implementation of function to
* deal with endian conversion.
*
* It is a stripped down version of linux ppc file...
*
* Copyright (C) 1999 Eric Valette (valette@crf.canon.fr)
* Canon Centre Recherche France.
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#ifndef _PPC_BYTEORDER_H
#define _PPC_BYTEORDER_H
/*
* $Id$
*/
#ifdef __GNUC__
extern __inline__ unsigned ld_le16(volatile unsigned short *addr)
{
unsigned val;
__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
return val;
}
extern __inline__ void st_le16(volatile unsigned short *addr, unsigned val)
{
__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
}
extern __inline__ unsigned ld_le32(volatile unsigned *addr)
{
unsigned val;
__asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
return val;
}
extern __inline__ void st_le32(volatile unsigned *addr, unsigned val)
{
__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
}
/* alas, egcs sounds like it has a bug in this code that doesn't use the
inline asm correctly, and can cause file corruption. Until I hear that
it's fixed, I can live without the extra speed. I hope. */
#if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90)
#if 0
# define __arch_swab16(x) ld_le16(&x)
# define __arch_swab32(x) ld_le32(&x)
#else
static __inline__ __const__ __unsigned short ___arch__swab16(__unsigned short value)
{
__unsigned int tmp;
__asm__("rlwimi %0,%0,8,0xff0000"
: "=r" (tmp)
: "0" (value));
return (tmp&0x00ffff00)>>8;
}
static __inline__ __const__ __unsigned int ___arch__swab32(__unsigned int value)
{
__unsigned int result;
__asm__("rotlwi %0,%1,24\n\t"
"rlwimi %0,%1,8,0xff\n\t"
"rlwimi %0,%1,8,0xff0000"
: "=&r" (result)
: "r" (value));
return result;
}
#define __arch__swab32(x) ___arch__swab32(x)
#define __arch__swab16(x) ___arch__swab16(x)
#endif /* 0 */
#endif
/* The same, but returns converted value from the location pointer by addr. */
#define __arch__swab16p(addr) ld_le16(addr)
#define __arch__swab32p(addr) ld_le32(addr)
/* The same, but do the conversion in situ, ie. put the value back to addr. */
#define __arch__swab16s(addr) st_le16(addr,*addr)
#define __arch__swab32s(addr) st_le32(addr,*addr)
#endif /* __GNUC__ */
#endif /* _PPC_BYTEORDER_H */