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 push \n" 25 " .set mips2 \n" 26 "1: ll %0, %1 # edac_atomic_scrub \n" 27 " addu %0, $0 \n" 28 " sc %0, %1 \n" 29 " beqz %0, 1b \n" 30 " .set pop \n" 31 : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr) 32 : GCC_OFF_SMALL_ASM() (*virt_addr)); 33 34 virt_addr++; 35 } 36 } 37 38 #endif 39