1 files changed, 83 insertions, 0 deletions
diff --git a/src/pkg/runtime/arm/atomic.c b/src/pkg/runtime/arm/atomic.c
new file mode 100644
index 000000000..52e4059ae
--- /dev/null
+++ b/src/pkg/runtime/arm/atomic.c
@@ -0,0 +1,83 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+
+// Atomic add and return new value.
+#pragma textflag 7
+uint32
+runtime·xadd(uint32 volatile *val, int32 delta)
+{
+	uint32 oval, nval;
+
+	for(;;){
+		oval = *val;
+		nval = oval + delta;
+		if(runtime·cas(val, oval, nval))
+			return nval;
+	}
+}
+
+#pragma textflag 7
+uint32
+runtime·xchg(uint32 volatile* addr, uint32 v)
+{
+	uint32 old;
+
+	for(;;) {
+		old = *addr;
+		if(runtime·cas(addr, old, v))
+			return old;
+	}
+}
+
+#pragma textflag 7
+void
+runtime·procyield(uint32 cnt)
+{
+	uint32 volatile i;
+
+	for(i = 0; i < cnt; i++) {
+	}
+}
+
+#pragma textflag 7
+uint32
+runtime·atomicload(uint32 volatile* addr)
+{
+	return runtime·xadd(addr, 0);
+}
+
+#pragma textflag 7
+void*
+runtime·atomicloadp(void* volatile* addr)
+{
+	return (void*)runtime·xadd((uint32 volatile*)addr, 0);
+}
+
+#pragma textflag 7
+void
+runtime·atomicstorep(void* volatile* addr, void* v)
+{
+	void *old;
+
+	for(;;) {
+		old = *addr;
+		if(runtime·casp(addr, old, v))
+			return;
+	}
+}
+
+#pragma textflag 7
+void
+runtime·atomicstore(uint32 volatile* addr, uint32 v)
+{
+	uint32 old;
+	
+	for(;;) {
+		old = *addr;
+		if(runtime·cas(addr, old, v))
+			return;
+	}
+}
+\ No newline at end of file