39c29657fc
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
36 lines
989 B
C
36 lines
989 B
C
#ifndef ASM_EDAC_H
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#define ASM_EDAC_H
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/* ECC atomic, DMA, SMP and interrupt safe scrub function */
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static inline void atomic_scrub(void *va, u32 size)
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{
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unsigned long *virt_addr = va;
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unsigned long temp;
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u32 i;
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for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) {
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/*
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* Very carefully read and write to memory atomically
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* so we are interrupt, DMA and SMP safe.
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*
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* Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
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*/
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__asm__ __volatile__ (
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" .set mips3 \n"
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"1: ll %0, %1 # atomic_add \n"
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" ll %0, %1 # atomic_add \n"
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" addu %0, $0 \n"
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" sc %0, %1 \n"
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" beqz %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*virt_addr)
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: "m" (*virt_addr));
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}
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}
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#endif
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