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/arch/powerpc/include/asm/edac.h

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C Header | 40 lines | 19 code | 2 blank | 19 comment | 1 complexity | 48c3374eeceb7f0304b455d1e2763ba5 MD5 | raw file
 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 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 */
19static __inline__ void 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