BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / sys / map.h

diff --git a/usr/src/sys/sys/map.h b/usr/src/sys/sys/map.h
index 0e8500e..b9242be 100644 (file)
--- a/usr/src/sys/sys/map.h
+++ b/usr/src/sys/sys/map.h
@@ -1,16 +1,73 @@
-/*     map.h   3.2     %G%     */
+/*-
+ * Copyright (c) 1982, 1986, The Regents of the University of California.
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *     @(#)map.h       7.5 (Berkeley) 5/7/91
+ */

 
 /*
 
 /*

- * Resource Allocation Maps
+ * Resource allocation maps.
+ *
+ * Associated routines manage sub-allocation of an address space using
+ * an array of segment descriptors.  The first element of this array
+ * is a map structure, describing the arrays extent and the name
+ * of the controlled object.  Each additional structure represents
+ * a free segment of the address space.
+ *
+ * A call to rminit initializes a resource map and may also be used
+ * to free some address space for the map.  Subsequent calls to rmalloc
+ * and rmfree allocate and free space in the resource map.  If the resource
+ * map becomes too fragmented to be described in the available space,
+ * then some of the resource is discarded.  This may lead to critical
+ * shortages, but is better than not checking (as the previous versions
+ * of these routines did) or giving up and calling panic().  The routines
+ * could use linked lists and call a memory allocator when they run
+ * out of space, but that would not solve the out of space problem when
+ * called at interrupt time.
+ *
+ * N.B.: The address 0 in the resource address space is not available
+ * as it is used internally by the resource map routines.

  */
  */

-struct map
-{
-       int     m_size;
-       int     m_addr;
+struct map {
+       struct  mapent *m_limit;        /* address of last slot in map */
+       char    *m_name;                /* name of resource, for messages */

 };
 
 };
 

-#ifdef KERNEL
-struct map swapmap[SMAPSIZ];   /* space for swap allocation */
+struct mapent {
+       int     m_size;                 /* size of this segment of the map */
+       int     m_addr;                 /* start of segment */
+};

 
 

-struct map kernelmap[NPROC];   /* space for kernel map for user page tables */
+#ifdef KERNEL
+#define        ARGMAPSIZE      16
+struct map *kmemmap, *mbmap, *swapmap;
+int    nswapmap;

 #endif
 #endif