| Dave Jiang | 723ec73 | 2007-03-02 13:36:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PPC EDAC common defs |
| 3 | * |
| 4 | * Author: Dave Jiang <djiang@mvista.com> |
| 5 | * |
| 6 | * 2007 (c) MontaVista Software, Inc. This file is licensed under |
| 7 | * the terms of the GNU General Public License version 2. This program |
| 8 | * is licensed "as is" without any warranty of any kind, whether express |
| 9 | * or implied. |
| 10 | */ |
| 11 | #ifndef ASM_EDAC_H |
| 12 | #define ASM_EDAC_H |
| 13 | /* |
| 14 | * ECC atomic, DMA, SMP and interrupt safe scrub function. |
| 15 | * Implements the per arch atomic_scrub() that EDAC use for software |
| 16 | * ECC scrubbing. It reads memory and then writes back the original |
| 17 | * value, allowing the hardware to detect and correct memory errors. |
| 18 | */ |
| 19 | static __inline__ void atomic_scrub(void *va, u32 size) |
| 20 | { |
| 21 | unsigned int *virt_addr = va; |
| 22 | unsigned int temp; |
| 23 | unsigned int i; |
| 24 | |
| 25 | for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) { |
| 26 | /* Very carefully read and write to memory atomically |
| 27 | * so we are interrupt, DMA and SMP safe. |
| 28 | */ |
| 29 | __asm__ __volatile__ ("\n\ |
| 30 | 1: lwarx %0,0,%1\n\ |
| 31 | stwcx. %0,0,%1\n\ |
| 32 | bne- 1b\n\ |
| 33 | isync" |
| 34 | : "=&r"(temp) |
| 35 | : "r"(virt_addr) |
| 36 | : "cr0", "memory"); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | #endif |