/* * PPC EDAC common defs * * Author: Dave Jiang <djiang@mvista.com> * * 2007 (c) MontaVista Software, Inc. This file is licensed under * the terms of the GNU General Public License version 2. This program * is licensed "as is" without any warranty of any kind, whether express * or implied. */ #ifndef ASM_EDAC_H #define ASM_EDAC_H /* * ECC atomic, DMA, SMP and interrupt safe scrub function. * Implements the per arch 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 atomic_scrub(void *va, u32 size) { unsigned int *virt_addr = va; unsigned int temp; 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: lwarx %0,0,%1\n\ stwcx. %0,0,%1\n\ bne- 1b\n\ isync" : "=&r"(temp) : "r"(virt_addr) : "cr0", "memory"); } } #endif