| /* |
| * 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 |
