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 
edac_atomic_scrub(void * va,u32 size)9 static 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