1 /* 2 * PPC EDAC common defs 3 * 4 * Author: Dave Jiang <djiang@mvista.com> 5 * 6 * 2007 (c) MontaVista Software, Inc. This file is licensed under 7 * the terms of the GNU General Public License version 2. This program 8 * is licensed "as is" without any warranty of any kind, whether express 9 * or implied. 10 */ 11 #ifndef ASM_EDAC_H 12 #define ASM_EDAC_H 13 /* 14 * ECC atomic, DMA, SMP and interrupt safe scrub function. 15 * Implements the per arch edac_atomic_scrub() that EDAC use for software 16 * ECC scrubbing. It reads memory and then writes back the original 17 * value, allowing the hardware to detect and correct memory errors. 18 */ 19 static __inline__ void edac_atomic_scrub(void *va, u32 size) 20 { 21 unsigned int *virt_addr = va; 22 unsigned int temp; 23 unsigned int i; 24 25 for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) { 26 /* Very carefully read and write to memory atomically 27 * so we are interrupt, DMA and SMP safe. 28 */ 29 __asm__ __volatile__ ("\n\ 30 1: lwarx %0,0,%1\n\ 31 stwcx. %0,0,%1\n\ 32 bne- 1b\n\ 33 isync" 34 : "=&r"(temp) 35 : "r"(virt_addr) 36 : "cr0", "memory"); 37 } 38 } 39 40 #endif 41