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15637ed4 | 1 | /*- |
78ed81a3 | 2 | * Copyright (c) 1982, 1986, The Regents of the University of California. |
15637ed4 RG |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
78ed81a3 | 33 | * from: @(#)map.h 7.5 (Berkeley) 5/7/91 |
34 | * $Id$ | |
15637ed4 RG |
35 | */ |
36 | ||
37 | /* | |
78ed81a3 | 38 | * Resource allocation maps. |
15637ed4 | 39 | * |
78ed81a3 | 40 | * Associated routines manage sub-allocation of an address space using |
41 | * an array of segment descriptors. The first element of this array | |
42 | * is a map structure, describing the arrays extent and the name | |
43 | * of the controlled object. Each additional structure represents | |
44 | * a free segment of the address space. | |
15637ed4 | 45 | * |
78ed81a3 | 46 | * A call to rminit initializes a resource map and may also be used |
47 | * to free some address space for the map. Subsequent calls to rmalloc | |
48 | * and rmfree allocate and free space in the resource map. If the resource | |
49 | * map becomes too fragmented to be described in the available space, | |
50 | * then some of the resource is discarded. This may lead to critical | |
51 | * shortages, but is better than not checking (as the previous versions | |
52 | * of these routines did) or giving up and calling panic(). The routines | |
53 | * could use linked lists and call a memory allocator when they run | |
54 | * out of space, but that would not solve the out of space problem when | |
55 | * called at interrupt time. | |
56 | * | |
57 | * N.B.: The address 0 in the resource address space is not available | |
58 | * as it is used internally by the resource map routines. | |
15637ed4 | 59 | */ |
78ed81a3 | 60 | struct map { |
61 | struct mapent *m_limit; /* address of last slot in map */ | |
62 | char *m_name; /* name of resource, for messages */ | |
63 | }; | |
15637ed4 | 64 | |
78ed81a3 | 65 | struct mapent { |
66 | int m_size; /* size of this segment of the map */ | |
67 | int m_addr; /* start of segment */ | |
68 | }; | |
15637ed4 | 69 | |
78ed81a3 | 70 | #ifdef KERNEL |
71 | #define ARGMAPSIZE 16 | |
72 | struct map *kmemmap, *mbmap, *swapmap; | |
73 | int nswapmap; | |
15637ed4 | 74 | #endif |