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723ec731 DJ |
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 |