arch/mips/include/asm/edac.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ASM_EDAC_H
   3 #define ASM_EDAC_H
   4
   5 #include <asm/compiler.h>
   6
   7 /* ECC atomic, DMA, SMP and interrupt safe scrub function */
   8
   9 static inline void edac_atomic_scrub(void *va, u32 size)
  10 {
  11         unsigned long *virt_addr = va;
  12         unsigned long temp;
  13         u32 i;
  14
  15         for (i = 0; i < size / sizeof(unsigned long); i++) {
  16                 /*
  17                  * Very carefully read and write to memory atomically
  18                  * so we are interrupt, DMA and SMP safe.
  19                  *
  20                  * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
  21                  */
  22
  23                 __asm__ __volatile__ (
  24                 "       .set    mips2                                   \n"
  25                 "1:     ll      %0, %1          # edac_atomic_scrub     \n"
  26                 "       addu    %0, $0                                  \n"
  27                 "       sc      %0, %1                                  \n"
  28                 "       beqz    %0, 1b                                  \n"
  29                 "       .set    mips0                                   \n"
  30                 : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
  31                 : GCC_OFF_SMALL_ASM() (*virt_addr));
  32
  33                 virt_addr++;
  34         }
  35 }
  36
  37 #endif