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: /lib/modules/5.11.0-1022-aws/build/arch/arm/include/asm/ [ drwxr-xr-x ]
name : edac.h /* 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