mirror of
https://gitee.com/openharmony/kernel_linux
synced 2024-12-12 00:57:56 +00:00
723ec731de
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>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
|
|
* 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
|