1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/atomic_arch.h b/arch/powerpc/atomic_arch.h
new file mode 100644
index 00000000..f014e3b8
--- /dev/null
+++ b/arch/powerpc/atomic_arch.h
@@ -0,0 +1,15 @@
+#define a_cas a_cas
+static inline int a_cas(volatile int *p, int t, int s)
+{
+	__asm__("\n"
+		"	sync\n"
+		"1:	lwarx %0, 0, %4\n"
+		"	cmpw %0, %2\n"
+		"	bne 1f\n"
+		"	stwcx. %3, 0, %4\n"
+		"	bne- 1b\n"
+		"	isync\n"
+		"1:	\n"
+		: "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" );
+        return t;
+}