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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 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

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