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