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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libcpu/] [powerpc/] [shared/] [byteorder.h] - Rev 596
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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: byteorder.h,v 1.2 2001-09-27 12:01:30 chris Exp $ */ #ifndef _PPC_BYTEORDER_H #define _PPC_BYTEORDER_H /* * $Id: byteorder.h,v 1.2 2001-09-27 12:01:30 chris Exp $ */ #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 */
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