linux-vybrid_public/include/asm-mips/edac.h

#ifndef ASM_EDAC_H
#define ASM_EDAC_H

/* ECC atomic, DMA, SMP and interrupt safe scrub function */

static inline void atomic_scrub(void *va, u32 size)
{
	unsigned long *virt_addr = va;
	unsigned long temp;
	u32 i;

	for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) {

		/*
		 * Very carefully read and write to memory atomically
		 * so we are interrupt, DMA and SMP safe.
		 *
		 * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
		 */

		__asm__ __volatile__ (
		"       .set    mips3                                   \n"
		"1:     ll      %0, %1          # atomic_add            \n"
		"       ll      %0, %1          # atomic_add            \n"
		"       addu    %0, $0                                  \n"
		"       sc      %0, %1                                  \n"
		"       beqz    %0, 1b                                  \n"
		"       .set    mips0                                   \n"
		: "=&r" (temp), "=m" (*virt_addr)
		: "m" (*virt_addr));

	}
}

#endif