/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2011 Calxeda, Inc.
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* Based on PPC version Copyright 2007 MontaVista Software, Inc.
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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 edac_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 edac_atomic_scrub(void *va, u32 size)
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{
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#if __LINUX_ARM_ARCH__ >= 6
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unsigned int *virt_addr = va;
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unsigned int temp, temp2;
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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: ldrex %0, [%2]\n"
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" strex %1, %0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b\n"
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: "=&r"(temp), "=&r"(temp2)
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: "r"(virt_addr)
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: "cc");
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}
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#endif
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}
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#endif
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