162306a36Sopenharmony_ci/*
262306a36Sopenharmony_ci * PPC EDAC common defs
362306a36Sopenharmony_ci *
462306a36Sopenharmony_ci * Author: Dave Jiang <djiang@mvista.com>
562306a36Sopenharmony_ci *
662306a36Sopenharmony_ci * 2007 (c) MontaVista Software, Inc. This file is licensed under
762306a36Sopenharmony_ci * the terms of the GNU General Public License version 2. This program
862306a36Sopenharmony_ci * is licensed "as is" without any warranty of any kind, whether express
962306a36Sopenharmony_ci * or implied.
1062306a36Sopenharmony_ci */
1162306a36Sopenharmony_ci#ifndef ASM_EDAC_H
1262306a36Sopenharmony_ci#define ASM_EDAC_H
1362306a36Sopenharmony_ci/*
1462306a36Sopenharmony_ci * ECC atomic, DMA, SMP and interrupt safe scrub function.
1562306a36Sopenharmony_ci * Implements the per arch edac_atomic_scrub() that EDAC use for software
1662306a36Sopenharmony_ci * ECC scrubbing.  It reads memory and then writes back the original
1762306a36Sopenharmony_ci * value, allowing the hardware to detect and correct memory errors.
1862306a36Sopenharmony_ci */
1962306a36Sopenharmony_cistatic __inline__ void edac_atomic_scrub(void *va, u32 size)
2062306a36Sopenharmony_ci{
2162306a36Sopenharmony_ci	unsigned int *virt_addr = va;
2262306a36Sopenharmony_ci	unsigned int temp;
2362306a36Sopenharmony_ci	unsigned int i;
2462306a36Sopenharmony_ci
2562306a36Sopenharmony_ci	for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
2662306a36Sopenharmony_ci		/* Very carefully read and write to memory atomically
2762306a36Sopenharmony_ci		 * so we are interrupt, DMA and SMP safe.
2862306a36Sopenharmony_ci		 */
2962306a36Sopenharmony_ci		__asm__ __volatile__ ("\n\
3062306a36Sopenharmony_ci				1:	lwarx	%0,0,%1\n\
3162306a36Sopenharmony_ci					stwcx.	%0,0,%1\n\
3262306a36Sopenharmony_ci					bne-	1b\n\
3362306a36Sopenharmony_ci					isync"
3462306a36Sopenharmony_ci					: "=&r"(temp)
3562306a36Sopenharmony_ci					: "r"(virt_addr)
3662306a36Sopenharmony_ci					: "cr0", "memory");
3762306a36Sopenharmony_ci	}
3862306a36Sopenharmony_ci}
3962306a36Sopenharmony_ci
4062306a36Sopenharmony_ci#endif
41