1#ifndef ASM_EDAC_H
2#define ASM_EDAC_H
3
4#include <asm/compiler.h>
5
6/* ECC atomic, DMA, SMP and interrupt safe scrub function */
7
8static inline void atomic_scrub(void *va, u32 size)
9{
10	unsigned long *virt_addr = va;
11	unsigned long temp;
12	u32 i;
13
14	for (i = 0; i < size / sizeof(unsigned long); i++) {
15		/*
16		 * Very carefully read and write to memory atomically
17		 * so we are interrupt, DMA and SMP safe.
18		 *
19		 * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
20		 */
21
22		__asm__ __volatile__ (
23		"	.set	mips2					\n"
24		"1:	ll	%0, %1		# atomic_scrub		\n"
25		"	addu	%0, $0					\n"
26		"	sc	%0, %1					\n"
27		"	beqz	%0, 1b					\n"
28		"	.set	mips0					\n"
29		: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
30		: GCC_OFF_SMALL_ASM() (*virt_addr));
31
32		virt_addr++;
33	}
34}
35
36#endif
37