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+/* $OpenBSD: mplock.h,v 1.13 2019/04/23 13:35:12 visa 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 _MPLOCK_H_
+#define _MPLOCK_H_
+
+#include <machine/mplock.h>
+
+#ifdef __USE_MI_MPLOCK
+
+#include <sys/_lock.h>
+
+struct __mp_lock_cpu {
+ u_int mplc_ticket;
+ u_int mplc_depth;
+};
+
+struct __mp_lock {
+ struct __mp_lock_cpu mpl_cpus[MAXCPUS];
+ volatile u_int mpl_ticket;
+ u_int mpl_users;
+#ifdef WITNESS
+ struct lock_object mpl_lock_obj;
+#endif
+};
+
+void ___mp_lock_init(struct __mp_lock *, const struct lock_type *);
+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 *, struct cpu_info *);
+
+#ifdef WITNESS
+
+#define __mp_lock_init(mpl) do { \
+ static const struct lock_type __lock_type = { .lt_name = #mpl };\
+ ___mp_lock_init((mpl), &__lock_type); \
+} while (0)
+
+#else /* WITNESS */
+
+#define __mp_lock_init(mpl) ___mp_lock_init((mpl), NULL)
+
+#endif /* WITNESS */
+
+#endif /* __USE_MI_MPLOCK */
+
+extern struct __mp_lock kernel_lock;
+
+#endif /* !_MPLOCK_H */