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
edac_atomic_scrub(void * va,u32 size)8 static inline void edac_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 # edac_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