1 files changed, 38 insertions, 0 deletions
diff --git a/arch/mips/include/asm/edac.h b/arch/mips/include/asm/edac.h
new file mode 100644
index 0000000000..c5d1477444
--- /dev/null
+++ b/arch/mips/include/asm/edac.h
@@ -0,0 +1,38 @@
+/* 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