Initial commit.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

include/sbi/riscv_locks.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef __RISCV_LOCKS_H__
+#define __RISCV_LOCKS_H__
+
+typedef struct {
+	volatile long lock;
+} spinlock_t;
+
+#define __RISCV_SPIN_UNLOCKED			0
+
+#define SPIN_LOCK_INIT(_lptr)			\
+	(_lptr)->lock = __RISCV_SPIN_UNLOCKED
+
+#define SPIN_LOCK_INITIALIZER			\
+	{ .lock = __RISCV_SPIN_UNLOCKED, }
+
+int spin_lock_check(spinlock_t *lock);
+
+int spin_trylock(spinlock_t *lock);
+
+void spin_lock(spinlock_t *lock);
+
+void spin_unlock(spinlock_t *lock);
+
+#endif