arch/mips/include/asm/edac.h

   1 #ifndef ASM_EDAC_H
   2 #define ASM_EDAC_H
   3
   4 /* ECC atomic, DMA, SMP and interrupt safe scrub function */
   5
   6 static 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