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author | Wim Van Sebroeck <wim@iguana.be> | 2007-05-01 08:53:01 +0200 |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2007-05-01 08:53:01 +0200 |
commit | 48a7afe314bfc4d7f50e1608632f503dbba7e013 (patch) | |
tree | 4a80e6b96321a71affd1bacea817de93be08894b /include/asm-powerpc/edac.h | |
parent | [WATCHDOG] Semi-typical watchdog bug re early misc_register() (diff) | |
parent | libata: honour host controllers that want just one host (diff) | |
download | linux-48a7afe314bfc4d7f50e1608632f503dbba7e013.tar.xz linux-48a7afe314bfc4d7f50e1608632f503dbba7e013.zip |
Merge /pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-powerpc/edac.h')
-rw-r--r-- | include/asm-powerpc/edac.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/asm-powerpc/edac.h b/include/asm-powerpc/edac.h new file mode 100644 index 000000000000..6ead88bbfbb8 --- /dev/null +++ b/include/asm-powerpc/edac.h @@ -0,0 +1,40 @@ +/* + * 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 |