/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ASM_EDAC_H
#define ASM_EDAC_H

#include <asm/compiler.h>

/* ECC atomic, DMA, SMP and interrupt safe scrub function */

static inline void edac_atomic_scrub(void *va, u32 size)
{
        unsigned long *virt_addr = va;
        unsigned long temp;
        u32 i;

        for (i = 0; i < size / sizeof(unsigned long); i++) {
                /*
                 * Very carefully read and write to memory atomically
                 * so we are interrupt, DMA and SMP safe.
                 *
                 * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
                 */

                __asm__ __volatile__ (
                "       .set    push                                    \n"
                "       .set    mips2                                   \n"
                "1:     ll      %0, %1          # edac_atomic_scrub     \n"
                "       addu    %0, $0                                  \n"
                "       sc      %0, %1                                  \n"
                "       beqz    %0, 1b                                  \n"
                "       .set    pop                                     \n"
                : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
                : GCC_OFF_SMALL_ASM() (*virt_addr));

                virt_addr++;
        }
}

#endif