LXR linux/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
   8static 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