diff options
Diffstat (limited to 'arch/arm/include/asm/edac.h')
| -rw-r--r-- | arch/arm/include/asm/edac.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/include/asm/edac.h b/arch/arm/include/asm/edac.h new file mode 100644 index 000000000..16f95dd37 --- /dev/null +++ b/arch/arm/include/asm/edac.h @@ -0,0 +1,38 @@ +/* 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 |