1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sh/include/asm/cmpxchg-grb.h b/arch/sh/include/asm/cmpxchg-grb.h
new file mode 100644
index 000000000..f848dec9e
--- /dev/null
+++ b/arch/sh/include/asm/cmpxchg-grb.h
@@ -0,0 +1,72 @@
+#ifndef __ASM_SH_CMPXCHG_GRB_H
+#define __ASM_SH_CMPXCHG_GRB_H
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+	unsigned long retval;
+
+	__asm__ __volatile__ (
+		"   .align 2              \n\t"
+		"   mova    1f,   r0      \n\t" /* r0 = end point */
+		"   nop                   \n\t"
+		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
+		"   mov    #-4,   r15     \n\t" /* LOGIN */
+		"   mov.l  @%1,   %0      \n\t" /* load  old value */
+		"   mov.l   %2,   @%1     \n\t" /* store new value */
+		"1: mov     r1,   r15     \n\t" /* LOGOUT */
+		: "=&r" (retval),
+		  "+r"  (m),
+		  "+r"  (val)		/* inhibit r15 overloading */
+		:
+		: "memory", "r0", "r1");
+
+	return retval;
+}
+
+static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
+{
+	unsigned long retval;
+
+	__asm__ __volatile__ (
+		"   .align  2             \n\t"
+		"   mova    1f,   r0      \n\t" /* r0 = end point */
+		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
+		"   mov    #-6,   r15     \n\t" /* LOGIN */
+		"   mov.b  @%1,   %0      \n\t" /* load  old value */
+		"   extu.b  %0,   %0      \n\t" /* extend as unsigned */
+		"   mov.b   %2,   @%1     \n\t" /* store new value */
+		"1: mov     r1,   r15     \n\t" /* LOGOUT */
+		: "=&r" (retval),
+		  "+r"  (m),
+		  "+r"  (val)		/* inhibit r15 overloading */
+		:
+		: "memory" , "r0", "r1");
+
+	return retval;
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+					  unsigned long new)
+{
+	unsigned long retval;
+
+	__asm__ __volatile__ (
+		"   .align  2             \n\t"
+		"   mova    1f,   r0      \n\t" /* r0 = end point */
+		"   nop                   \n\t"
+		"   mov    r15,   r1      \n\t" /* r1 = saved sp */
+		"   mov    #-8,   r15     \n\t" /* LOGIN */
+		"   mov.l  @%3,   %0      \n\t" /* load  old value */
+		"   cmp/eq  %0,   %1      \n\t"
+		"   bf            1f      \n\t" /* if not equal */
+		"   mov.l   %2,   @%3     \n\t" /* store new value */
+		"1: mov     r1,   r15     \n\t" /* LOGOUT */
+		: "=&r" (retval),
+		  "+r"  (old), "+r"  (new) /* old or new can be r15 */
+		:  "r"  (m)
+		: "memory" , "r0", "r1", "t");
+
+	return retval;
+}
+
+#endif /* __ASM_SH_CMPXCHG_GRB_H */