arch/mips/include/asm/edac.h

   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
   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