| /* 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 |
