87 lines
3.8 KiB
C
87 lines
3.8 KiB
C
/* $NetBSD: map.h,v 1.14 1998/02/05 08:00:41 mrg Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)map.h 8.3 (Berkeley) 1/26/94
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*/
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#ifndef _SYS_MAP_H_
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#define _SYS_MAP_H_
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/*
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* Resource allocation maps.
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*
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* Associated routines manage sub-allocation of an address space using
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* an array of segment descriptors. The first element of this array
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* is a map structure, describing the arrays extent and the name
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* of the controlled object. Each additional structure represents
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* a free segment of the address space.
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*
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* A call to rminit initializes a resource map. Later on, rmfree may be used
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* to free some more address space for the map. Subsequent calls to rmalloc
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* and rmfree allocate and free space in the resource map. If the resource
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* map becomes too fragmented to be described in the available space,
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* then some of the resource is discarded. This may lead to critical
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* shortages, but is better than not checking (as the previous versions
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* of these routines did) or giving up and calling panic(). The routines
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* could use linked lists and call a memory allocator when they run
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* out of space, but that would not solve the out of space problem when
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* called at interrupt time.
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*
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* N.B.: The address 0 in the resource address space is not available
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* as it is used internally by the resource map routines.
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*/
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struct map {
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struct mapent *m_limit; /* first slot beyond map */
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char *m_name; /* name of resource, for messages */
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};
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struct mapent {
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long m_size; /* size of this segment of the map */
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long m_addr; /* start of segment */
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};
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#ifdef _KERNEL
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long rmalloc __P((struct map *, long));
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void rmfree __P((struct map *, long, long));
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void rminit __P((struct map *, long, long, char *, int));
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#endif /* _KERNEL */
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#endif /* !_SYS_MAP_H_ */
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