1 files changed, 53 insertions, 0 deletions
diff --git a/arch/sh/include/asm/cmpxchg-llsc.h b/arch/sh/include/asm/cmpxchg-llsc.h
new file mode 100644
index 000000000..d5270cd29
--- /dev/null
+++ b/arch/sh/include/asm/cmpxchg-llsc.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_CMPXCHG_LLSC_H
+#define __ASM_SH_CMPXCHG_LLSC_H
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+	unsigned long retval;
+	unsigned long tmp;
+
+	__asm__ __volatile__ (
+		"1:					\n\t"
+		"movli.l	@%2, %0	! xchg_u32	\n\t"
+		"mov		%0, %1			\n\t"
+		"mov		%3, %0			\n\t"
+		"movco.l	%0, @%2			\n\t"
+		"bf		1b			\n\t"
+		"synco					\n\t"
+		: "=&z"(tmp), "=&r" (retval)
+		: "r" (m), "r" (val)
+		: "t", "memory"
+	);
+
+	return retval;
+}
+
+static inline unsigned long
+__cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
+{
+	unsigned long retval;
+	unsigned long tmp;
+
+	__asm__ __volatile__ (
+		"1:						\n\t"
+		"movli.l	@%2, %0	! __cmpxchg_u32		\n\t"
+		"mov		%0, %1				\n\t"
+		"cmp/eq		%1, %3				\n\t"
+		"bf		2f				\n\t"
+		"mov		%4, %0				\n\t"
+		"2:						\n\t"
+		"movco.l	%0, @%2				\n\t"
+		"bf		1b				\n\t"
+		"synco						\n\t"
+		: "=&z" (tmp), "=&r" (retval)
+		: "r" (m), "r" (old), "r" (new)
+		: "t", "memory"
+	);
+
+	return retval;
+}
+
+#include <asm/cmpxchg-xchg.h>
+
+#endif /* __ASM_SH_CMPXCHG_LLSC_H */