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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
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/*
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* PPC EDAC common defs
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*
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* Author: Dave Jiang <djiang@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#ifndef ASM_EDAC_H
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#define ASM_EDAC_H
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/*
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* ECC atomic, DMA, SMP and interrupt safe scrub function.
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* Implements the per arch atomic_scrub() that EDAC use for software
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* ECC scrubbing. It reads memory and then writes back the original
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* value, allowing the hardware to detect and correct memory errors.
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*/
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static __inline__ void atomic_scrub(void *va, u32 size)
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{
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unsigned int *virt_addr = va;
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unsigned int temp;
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unsigned int i;
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for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
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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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__asm__ __volatile__ ("\n\
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1: lwarx %0,0,%1\n\
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stwcx. %0,0,%1\n\
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bne- 1b\n\
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isync"
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: "=&r"(temp)
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: "r"(virt_addr)
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: "cr0", "memory");
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}
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}
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#endif
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