Simple single-processor only mutex implementation; cloned from hppa.

3 files changed, 127 insertions, 1 deletions

diff --git a/sys/arch/hppa64/conf/files.hppa64 b/sys/arch/hppa64/conf/files.hppa64
index c287d8e27a1..800f59e1a03 100644
--- a/sys/arch/hppa64/conf/files.hppa64
+++ b/sys/arch/hppa64/conf/files.hppa64
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.hppa64,v 1.3 2006/09/27 06:33:03 grange Exp $
+#	$OpenBSD: files.hppa64,v 1.4 2007/10/06 14:54:38 kettenis Exp $
 #
 # hppa64-specific configuration info
 
@@ -127,6 +127,7 @@ file	arch/hppa64/hppa64/db_interface.c	ddb
 file	arch/hppa64/hppa64/db_disasm.c		ddb
 file	arch/hppa64/hppa64/disksubr.c		disk
 file	arch/hppa64/hppa64/machdep.c
+file	arch/hppa64/hppa64/mutex.c
 file	arch/hppa64/hppa64/pmap.c
 file	arch/hppa64/hppa64/process_machdep.c
 file	arch/hppa64/hppa64/sys_machdep.c
diff --git a/sys/arch/hppa64/hppa64/mutex.c b/sys/arch/hppa64/hppa64/mutex.c
new file mode 100644
index 00000000000..6fe5b0aa415
--- /dev/null
+++ b/sys/arch/hppa64/hppa64/mutex.c
@@ -0,0 +1,64 @@
+/*	$OpenBSD: mutex.c,v 1.1 2007/10/06 14:54:38 kettenis Exp $	*/
+
+/*
+ * 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. 
+ */
+
+#include <sys/param.h>
+#include <sys/mutex.h>
+#include <sys/systm.h>
+
+#ifdef MULTIPROCESSOR
+#error This code needs more work
+#endif
+
+/*
+ * Single processor systems don't need any mutexes, but they need the spl
+ * raising semantics of the mutexes.
+ */
+void
+mtx_init(struct mutex *mtx, int wantipl)
+{
+	mtx->mtx_oldipl = 0;
+	mtx->mtx_wantipl = wantipl;
+	mtx->mtx_lock = 0;
+}
+
+void
+mtx_enter(struct mutex *mtx)
+{
+	if (mtx->mtx_wantipl != IPL_NONE)
+		mtx->mtx_oldipl = splraise(mtx->mtx_wantipl);
+	MUTEX_ASSERT_UNLOCKED(mtx);
+	mtx->mtx_lock = 1;
+}
+
+void
+mtx_leave(struct mutex *mtx)
+{
+	MUTEX_ASSERT_LOCKED(mtx);
+	mtx->mtx_lock = 0;
+	if (mtx->mtx_wantipl != IPL_NONE)
+		splx(mtx->mtx_oldipl);
+}
diff --git a/sys/arch/hppa64/include/mutex.h b/sys/arch/hppa64/include/mutex.h
new file mode 100644
index 00000000000..714f2d165d5
--- /dev/null
+++ b/sys/arch/hppa64/include/mutex.h
@@ -0,0 +1,61 @@
+/*	$OpenBSD: mutex.h,v 1.1 2007/10/06 14:54:38 kettenis Exp $	*/
+
+/*
+ * 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 _MACHINE_MUTEX_H_
+#define _MACHINE_MUTEX_H_
+
+/*
+ * Simple non-mp implementation.
+ */
+struct mutex {
+	int mtx_lock;
+	int mtx_wantipl;
+	int mtx_oldipl;
+};
+
+void mtx_init(struct mutex *, int);
+
+#define MUTEX_INITIALIZER(ipl) { 0, (ipl), 0 }
+
+#ifdef DIAGNOSTIC
+#define MUTEX_ASSERT_LOCKED(mtx) do {					\
+	if ((mtx)->mtx_lock == 0)					\
+		panic("mutex %p not held in %s", (mtx), __func__);	\
+} while (0)
+
+#define MUTEX_ASSERT_UNLOCKED(mtx) do {					\
+	if ((mtx)->mtx_lock != 0)					\
+		panic("mutex %p held in %s", (mtx), __func__);		\
+} while (0)
+#else
+#define MUTEX_ASSERT_LOCKED(mtx) do { } while (0)
+#define MUTEX_ASSERT_UNLOCKED(mtx) do { } while (0)
+#endif
+
+#define MUTEX_OLDIPL(mtx)	(mtx)->mtx_oldipl
+
+#endif