Release 4.14 arch/powerpc/include/asm/edac.h

/*
 * 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 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)
{
	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");
	}
}

Contributors
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Dave Jiang
56
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Borislav Petkov
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#endif
Overall Contributors
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Borislav Petkov
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Total
67
100.00%
2
100.00%
Directory: arch/powerpc/include/asm

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