Work in progress work towards SMP, heavily based upon NetBSD. The MP kernel

will boot multiuser, but will deadlock under load, and I can't find my
mistake yet.

1 files changed, 52 insertions, 0 deletions

diff --git a/sys/arch/alpha/include/mplock.h b/sys/arch/alpha/include/mplock.h
new file mode 100644
index 00000000000..8f8523a539e
--- /dev/null
+++ b/sys/arch/alpha/include/mplock.h
@@ -0,0 +1,52 @@
+/*	$OpenBSD: mplock.h,v 1.1 2014/01/26 17:40:11 miod Exp $	*/
+
+/*
+ * Copyright (c) 2004 Niklas Hallqvist.  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. 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 THE AUTHOR ``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_MPLOCK_H_
+#define _MACHINE_MPLOCK_H_
+
+/*
+ * Really simple spinlock implementation with recursive capabilities.
+ * Correctness is paramount, no fancyness allowed.
+ */
+
+struct __mp_lock {
+	volatile struct cpu_info *mpl_cpu;
+	volatile long		mpl_count;
+};
+
+#ifndef _LOCORE
+
+void __mp_lock_init(struct __mp_lock *);
+void __mp_lock(struct __mp_lock *);
+void __mp_unlock(struct __mp_lock *);
+int __mp_release_all(struct __mp_lock *);
+int __mp_release_all_but_one(struct __mp_lock *);
+void __mp_acquire_count(struct __mp_lock *, int);
+int __mp_lock_held(struct __mp_lock *);
+
+#endif
+
+#endif /* !_MACHINE_MPLOCK_H */