1 files changed, 82 insertions, 0 deletions
diff --git a/sys/kern/subr_mutex.c b/sys/kern/subr_mutex.c
new file mode 100644
index 00000000000..d4f397466ae
--- /dev/null
+++ b/sys/kern/subr_mutex.c
@@ -0,0 +1,82 @@
+/*
+ * 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>
+
+#ifndef __HAVE_MUTEX
+
+/*
+ * Single processor systems don't need any mutexes, but they need the spl
+ * raising semantics of the mutexes.
+ */
+void
+mtx_init1(struct mutex *mtx, int wantipl)
+{
+	mtx->mtx_oldipl = 0;
+	mtx->mtx_wantipl = wantipl;
+	mtx->mtx_lock = 0;
+}
+
+void
+mtx_enter(struct mutex *mtx)
+{
+#define UGLY(lc, uc)	case MUTEX_IPL_##uc: mtx->mtx_oldipl = spl##lc(); break
+
+	switch (mtx->mtx_wantipl) {
+	UGLY(high, HIGH);
+	UGLY(statclock, STATCLOCK);
+#ifdef IPL_SCHED
+	UGLY(sched, SCHED);
+#endif
+	UGLY(clock, CLOCK);
+	UGLY(vm, VM);
+	UGLY(tty, TTY);
+	UGLY(net, NET);	
+	UGLY(bio, BIO);
+	UGLY(softnet, SOFTNET);
+	UGLY(softclock, SOFTCLOCK);
+	case MUTEX_IPL_NONE:
+		break;
+	default:
+		panic("mtx_enter: ipl not implemented");
+	}
+#undef UGLY
+
+	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 != MUTEX_IPL_NONE)
+		splx(mtx->mtx_oldipl);
+}
+
+#endif