Messages in this thread Patch in this message | | | Date | Wed, 25 Jul 2007 14:55:01 -0600 | From | dougthompson@xmission ... | Subject | [PATCH 3/4] include asm-mips add missing edac h file |
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From: Doug Thompson <dougthompson@xmission.h>
EDAC has a foundation to perform software memory scrubbing, but it requires a per architecture (atomic_scrub) function for performing an atomic update operation. Under X86, this is done with a
lock: add [addr],0
in the file asm-x86/edac.h
This patch provides the MIPS arch with that atomic function, atomic_scrub() in
asm-mips/edac.h
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Doug Thompson <dougthompson@xmission.com> --- edac.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)
Index: linux-2.6.23-rc1/include/asm-mips/edac.h =================================================================== --- /dev/null +++ linux-2.6.23-rc1/include/asm-mips/edac.h @@ -0,0 +1,35 @@ +#ifndef ASM_EDAC_H +#define ASM_EDAC_H + +/* ECC atomic, DMA, SMP and interrupt safe scrub function */ + +static __inline__ void atomic_scrub(void *va, u32 size) +{ + unsigned long *virt_addr = va; + unsigned long temp; + u32 i; + + for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) { + + /* + * Very carefully read and write to memory atomically + * so we are interrupt, DMA and SMP safe. + * + * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr)); + */ + + __asm__ __volatile__ ( + " .set mips3 \n" + "1: ll %0, %1 # atomic_add \n" + " ll %0, %1 # atomic_add \n" + " addu %0, $0 \n" + " sc %0, %1 \n" + " beqz %0, 1b \n" + " .set mips0 \n" + : "=&r" (temp), "=m" (*virt_addr) + : "m" (*virt_addr)); + + } +} + +#endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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