[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/bsp/lk/arch/arm64/spinlock.S b/src/bsp/lk/arch/arm64/spinlock.S
new file mode 100644
index 0000000..ef5b3d1
--- /dev/null
+++ b/src/bsp/lk/arch/arm64/spinlock.S
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 Google Inc. All rights reserved
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <asm.h>
+
+.text
+
+FUNCTION(arch_spin_trylock)
+ mov x2, x0
+ mov x1, #1
+ ldaxr x0, [x2]
+ cbnz x0, 1f
+ stxr w0, x1, [x2]
+1:
+ ret
+
+FUNCTION(arch_spin_lock)
+ mov x1, #1
+ sevl
+1:
+ wfe
+ ldaxr x2, [x0]
+ cbnz x2, 1b
+ stxr w2, x1, [x0]
+ cbnz w2, 1b
+ ret
+
+FUNCTION(arch_spin_unlock)
+ stlr xzr, [x0]
+ ret