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[POWERPC] EDAC ECC software scrubber

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Implements the per arch atomic_scrub() that EDAC uses for software
ECC scrubbing.  It reads memory and then writes back the original
value, allowing the hardware to detect and correct memory errors.

Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Dave Jiang 2007-03-02 13:36:21 -07:00 committed by Paul Mackerras
parent 27565903e9
commit 723ec731de
1 changed files with 40 additions and 0 deletions
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include/asm-powerpc/edac.h Normal file
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/*
* PPC EDAC common defs
*
* Author: Dave Jiang <djiang@mvista.com>
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#ifndef ASM_EDAC_H
#define ASM_EDAC_H
/*
* ECC atomic, DMA, SMP and interrupt safe scrub function.
* Implements the per arch atomic_scrub() that EDAC use for software
* ECC scrubbing. It reads memory and then writes back the original
* value, allowing the hardware to detect and correct memory errors.
*/
static __inline__ void atomic_scrub(void *va, u32 size)
{
unsigned int *virt_addr = va;
unsigned int temp;
unsigned int i;
for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
/* Very carefully read and write to memory atomically
* so we are interrupt, DMA and SMP safe.
*/
__asm__ __volatile__ ("\n\
1: lwarx %0,0,%1\n\
stwcx. %0,0,%1\n\
bne- 1b\n\
isync"
: "=&r"(temp)
: "r"(virt_addr)
: "cr0", "memory");
}
}
#endif