The new resource manager, hopefully in a reasonably stable form.

1 files changed, 97 insertions, 0 deletions

diff --git a/sys/sys/rman.h b/sys/sys/rman.h
new file mode 100644
index 0000000..224d9ed
--- /dev/null
+++ b/sys/sys/rman.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright 1998 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that both the above copyright notice and this
+ * permission notice appear in all copies, that both the above
+ * copyright notice and this permission notice appear in all
+ * supporting documentation, and that the name of M.I.T. not be used
+ * in advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.  M.I.T. makes
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+ * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+ * SHALL M.I.T. 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.
+ *
+ *	$Id$
+ */
+
+#ifndef _SYS_RMAN_H_
+#define	_SYS_RMAN_H_	1
+
+#ifndef	KERNEL
+#include <sys/queue.h>
+#endif /* !KERNEL */
+
+/*
+ * We use a linked list rather than a bitmap because we need to be able to
+ * represent potentially huge objects (like all of a processor's physical
+ * address space).  That is also why the indices are defined to have type
+ * `unsigned long' -- that being the largest integral type in Standard C.
+ */
+CIRCLEQ_HEAD(resource_head, resource);
+struct	resource {
+	CIRCLEQ_ENTRY(resource)	r_link;
+	LIST_ENTRY(resource)	r_sharelink;
+	LIST_HEAD(, resource) 	*r_sharehead;
+	u_long	r_start;	/* index of the first entry in this resource */
+	u_long	r_end;		/* index of the last entry (inclusive) */
+	u_int	r_flags;
+	void	*r_virtual;	/* virtual address of this resource */
+	struct	device *r_dev;	/* device which has allocated this resource */
+	struct	rman *r_rm;	/* resource manager from whence this came */
+};
+
+#define	RF_ALLOCATED	0x0001	/* resource has been reserved */
+#define	RF_ACTIVE	0x0002	/* resource allocation has been activated */
+#define	RF_SHAREABLE	0x0004	/* resource permits contemporaneous sharing */
+#define	RF_TIMESHARE	0x0008	/* resource permits time-division sharing */
+#define	RF_WANTED	0x0010	/* somebody is waiting for this resource */
+#define	RF_FIRSTSHARE	0x0020	/* first in sharing list */
+
+enum	rman_type { RMAN_UNINIT = 0, RMAN_GAUGE, RMAN_ARRAY };
+
+struct	rman {
+	struct	resource_head 	rm_list;
+	struct	simplelock *rm_slock; /* mutex used to protect rm_list */
+	TAILQ_ENTRY(rman)	rm_link; /* link in list of all rmans */
+	u_long	rm_start;	/* index of globally first entry */
+	u_long	rm_end;		/* index of globally last entry */
+	enum	rman_type rm_type; /* what type of resource this is */
+	const	char *rm_descr;	/* text descripion of this resource */
+};
+TAILQ_HEAD(rman_head, rman);
+
+#ifdef KERNEL
+
+int	rman_activate_resource(struct resource *r);
+int	rman_await_resource(struct resource *r, int pri, int timo);
+int	rman_deactivate_resource(struct resource *r);
+int	rman_fini(struct rman *rm);
+int	rman_init(struct rman *rm);
+int	rman_manage_region(struct rman *rm, u_long start, u_long end);
+int	rman_release_resource(struct resource *r);
+struct	resource *rman_reserve_resource(struct rman *rm, u_long start,
+					u_long end, u_long count,
+					u_int flags, struct device *dev);
+
+#define	rman_set_virtual(r,v)	((r)->r_virtual = (v))
+#define	rman_get_virtual(r)	((r)->r_virtual)
+
+extern	struct rman_head rman_head;
+#endif /* KERNEL */
+
+#endif /* !_SYS_RMAN_H_ */