Unify the arch headers.
The arch interface is defined in common headers and each arch has its
own implementation.
Change-Id: I2d783fcd951f2a51458d9c2d4adc5bf72200dde7
diff --git a/inc/hf/arch/barriers.h b/inc/hf/arch/barriers.h
new file mode 100644
index 0000000..a22d1d1
--- /dev/null
+++ b/inc/hf/arch/barriers.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+/**
+ * Ensures all explicit memory accesses before this point are completed before
+ * any later memory accesses are performed.
+ */
+void dmb(void);
+
+/**
+ * Ensure all explicit memory access and management instructions have completed
+ * before continuing.
+ */
+void dsb(void);
+
+/**
+ * Flushes the instruction pipeline so that instructions are fetched from
+ * memory.
+ */
+void isb(void);