diff --git a/src/arch/riscv/include/arch/smp/spinlock.h b/src/arch/riscv/include/arch/smp/spinlock.h
index bdf8ec4584..dc561d30a1 100644
--- a/src/arch/riscv/include/arch/smp/spinlock.h
+++ b/src/arch/riscv/include/arch/smp/spinlock.h
@@ -1,6 +1,8 @@
 /*
  * This file is part of the coreboot project.
  *
+ * Copyright (C) 2018 HardenedLinux.
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; version 2 of the License.
@@ -10,3 +12,29 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
+#ifndef ARCH_SMP_SPINLOCK_H
+#define ARCH_SMP_SPINLOCK_H
+
+#include <arch/encoding.h>
+#include <arch/smp/atomic.h>
+
+#define barrier() { asm volatile ("fence" ::: "memory"); }
+
+typedef struct {
+	volatile atomic_t lock;
+} spinlock_t;
+
+static inline void spinlock_lock(spinlock_t *lock)
+{
+	while (atomic_swap(&lock->lock, -1))
+		;
+	barrier();
+}
+
+static inline void spinlock_unlock(spinlock_t *lock)
+{
+	barrier();
+	atomic_set(&lock->lock, 0);
+}
+
+#endif // ARCH_SMP_SPINLOCK_H