Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=723ec731de880a76a004a304b62bf8d0f96435d8 Commit: 723ec731de880a76a004a304b62bf8d0f96435d8 Parent: 27565903e94d548256bf5923653ab2a9668c9b9f Author: Dave Jiang <[EMAIL PROTECTED]> AuthorDate: Fri Mar 2 13:36:21 2007 -0700 Committer: Paul Mackerras <[EMAIL PROTECTED]> CommitDate: Fri Mar 9 15:03:25 2007 +1100
[POWERPC] EDAC ECC software scrubber 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 <[EMAIL PROTECTED]> Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]> --- 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 0000000..6ead88b --- /dev/null +++ b/include/asm-powerpc/edac.h @@ -0,0 +1,40 @@ +/* + * PPC EDAC common defs + * + * Author: Dave Jiang <[EMAIL PROTECTED]> + * + * 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 - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html