blob: 5571e23d253e5a4f2600b292d78ae809f1d387dc [file] [log] [blame]
* PPC EDAC common defs
* Author: Dave Jiang <>
* 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 edac_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 edac_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\
: "=&r"(temp)
: "r"(virt_addr)
: "cr0", "memory");