netbsd fsck driver import

. fsck driver parses /etc/fstab and invokes sub-fscks
	. further simplifies fs handling in rc

nbsd_include/arch/x86/include/Makefile

@@ -5,6 +5,7 @@ INCSDIR=/usr/include/x86
 INCS=	float.h \
 	ieee.h \
 	ieeefp.h \
-	math.h 
+	math.h 	\
+	mutex.h
 
 .include <bsd.kinc.mk>

nbsd_include/arch/x86/include/mutex.h

@@ -0,0 +1,80 @@
+/*	$NetBSD: mutex.h,v 1.6 2009/04/24 17:49:51 ad Exp $	*/
+
+/*-
+ * Copyright (c) 2002, 2006, 2009 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe and Andrew Doran.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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 _X86_MUTEX_H_
+#define	_X86_MUTEX_H_
+
+struct kmutex {
+	union {
+		volatile uintptr_t	mtxa_owner;
+#ifdef __MUTEX_PRIVATE
+		struct {
+			volatile uint8_t	mtxs_dummy;
+			ipl_cookie_t		mtxs_ipl;
+                        __cpu_simple_lock_t	mtxs_lock;
+			volatile uint8_t	mtxs_unused;
+		} s;
+#endif
+	} u;
+};
+
+#ifdef __MUTEX_PRIVATE
+
+#define	mtx_owner 			u.mtxa_owner
+#define	mtx_ipl 			u.s.mtxs_ipl
+#define	mtx_lock			u.s.mtxs_lock
+
+#define __HAVE_MUTEX_STUBS		1
+#define __HAVE_SPIN_MUTEX_STUBS		1
+#define	__HAVE_SIMPLE_MUTEXES		1
+
+/*
+ * MUTEX_RECEIVE: technically, no memory barrier is required
+ * as 'ret' implies a load fence.  However we need this to
+ * handle a bug with some Opteron revisions.  See patch.c,
+ * lock_stubs.S.
+ */
+#define	MUTEX_RECEIVE(mtx)		membar_consumer()
+
+/*
+ * MUTEX_GIVE: no memory barrier required, as _lock_cas() will take care of it.
+ */
+#define	MUTEX_GIVE(mtx)			/* nothing */
+
+#define	MUTEX_CAS(p, o, n)		\
+    (_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
+
+unsigned long	_atomic_cas_ulong(volatile unsigned long *,
+    unsigned long, unsigned long);
+
+#endif	/* __MUTEX_PRIVATE */
+
+#endif /* _X86_MUTEX_H_ */