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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2011 Calxeda, Inc.
* Based on PPC version Copyright 2007 MontaVista Software, Inc.
*/
#ifndef ASM_EDAC_H
#define ASM_EDAC_H
/*
* ECC atomic, DMA, SMP and interrupt safe scrub function.
* Implements the per arch edac_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 edac_atomic_scrub(void *va, u32 size)
{
#if __LINUX_ARM_ARCH__ >= 6
unsigned int *virt_addr = va;
unsigned int temp, temp2;
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: ldrex %0, [%2]\n"
" strex %1, %0, [%2]\n"
" teq %1, #0\n"
" bne 1b\n"
: "=&r"(temp), "=&r"(temp2)
: "r"(virt_addr)
: "cc");
}
#endif
}
#endif
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