1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef ASM_EDAC_H
3#define ASM_EDAC_H
4
5#include <asm/compiler.h>
6
7/* ECC atomic, DMA, SMP and interrupt safe scrub function */
8
9static inline void edac_atomic_scrub(void *va, u32 size)
10{
11	unsigned long *virt_addr = va;
12	unsigned long temp;
13	u32 i;
14
15	for (i = 0; i < size / sizeof(unsigned long); i++) {
16		/*
17		 * Very carefully read and write to memory atomically
18		 * so we are interrupt, DMA and SMP safe.
19		 *
20		 * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
21		 */
22
23		__asm__ __volatile__ (
24		"	.set	push					\n"
25		"	.set	mips2					\n"
26		"1:	ll	%0, %1		# edac_atomic_scrub	\n"
27		"	addu	%0, $0					\n"
28		"	sc	%0, %1					\n"
29		"	beqz	%0, 1b					\n"
30		"	.set	pop					\n"
31		: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
32		: GCC_OFF_SMALL_ASM() (*virt_addr));
33
34		virt_addr++;
35	}
36}
37
38#endif
39