MD mutex implementation on amd64.

1 files changed, 48 insertions, 0 deletions

diff --git a/sys/arch/amd64/include/mutex.h b/sys/arch/amd64/include/mutex.h
new file mode 100644
index 00000000000..ccb1b95774d
--- /dev/null
+++ b/sys/arch/amd64/include/mutex.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
+ * All rights reserved. 
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED ``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
+ * THE AUTHOR 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. 
+ */
+#ifndef _AMD64_MUTEX_H_
+#define _AMD64_MUTEX_H_
+
+struct mutex {
+	int mtx_wantipl;
+	int mtx_oldipl;
+	__volatile void *mtx_owner;
+};
+
+#define MUTEX_INITIALIZER(ipl) { (ipl), 0, NULL }
+
+#define MUTEX_ASSERT_LOCKED(mtx) do {					\
+	if ((mtx)->mtx_owner != curcpu())				\
+		panic("mutex %p not held in %s\n", (mtx), __func__);	\
+} while (0)
+
+#define MUTEX_ASSERT_UNLOCKED(mtx) do {					\
+	if ((mtx)->mtx_owner == curcpu())				\
+		panic("mutex %p held in %s\n", (mtx), __func__);	\
+} while (0)
+
+#define MUTEX_OLDIPL(mtx)	(mtx)->mtx_oldipl
+
+#endif