From: Costin Lupu <costin.lupu@xxxxxxxxx>
We use empty spinlocks for indicating where synchronization is
required. The spinlocks operations should be extended when Unikraft
will have SMP support.
Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
include/uk/arch/spinlock.h | 54 ++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
create mode 100644 include/uk/arch/spinlock.h
diff --git a/include/uk/arch/spinlock.h b/include/uk/arch/spinlock.h
new file mode 100644
index 0000000..b7a7501
--- /dev/null
+++ b/include/uk/arch/spinlock.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/* Taken from Mini-OS */
+
+#ifndef __UKARCH_SPINLOCK_H__
+#define __UKARCH_SPINLOCK_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {} spinlock_t;
+
+#ifdef CONFIG_SMP
+#error "Define your spinlock operations!"
+#else
+
+#define ukarch_spin_lock_init(lock) do {} while (0)
+#define ukarch_spin_is_locked(lock) do {} while (0)
+#define ukarch_spin_lock(lock) do {} while (0)
+#define ukarch_spin_trylock(lock) do {} while (0)
+#define ukarch_spin_unlock(lock) do {} while (0)
+
+/* Defines a preinitialized spin_lock in unlocked state */
+#define DEFINE_SPINLOCK(lock) do {} while (0)
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __UKARCH_SPINLOCK_H__ */
