133 lines
5.2 KiB
C
133 lines
5.2 KiB
C
/* $OpenBSD: extent.h,v 1.15 2024/01/19 22:12:24 kettenis Exp $ */
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/* $NetBSD: extent.h,v 1.6 1997/10/09 07:43:05 jtc Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_EXTENT_H_
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#define _SYS_EXTENT_H_
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#include <sys/queue.h>
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struct extent_region {
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LIST_ENTRY(extent_region) er_link; /* link in region list */
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u_long er_start; /* start of region */
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u_long er_end; /* end of region */
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int er_flags; /* misc. flags */
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};
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/* er_flags */
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#define ER_ALLOC 0x01 /* region descriptor dynamically allocated */
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#define ER_DISCARD 0x02 /* discard region descriptor after use */
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struct extent {
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char *ex_name; /* name of extent */
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/* allocated regions in extent */
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LIST_HEAD(, extent_region) ex_regions;
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u_long ex_start; /* start of extent */
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u_long ex_end; /* end of extent */
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int ex_mtype; /* memory type */
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int ex_flags; /* misc. information */
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LIST_ENTRY(extent) ex_link;
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};
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struct extent_fixed {
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struct extent fex_extent; /* MUST BE FIRST */
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/* freelist of region descriptors */
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LIST_HEAD(, extent_region) fex_freelist;
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caddr_t fex_storage; /* storage space for descriptors */
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size_t fex_storagesize; /* size of storage space */
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};
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/* ex_flags; for internal use only */
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#define EXF_FIXED 0x01 /* extent uses fixed storage */
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#define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */
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#define EXF_WANTED 0x04 /* someone asleep on extent */
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#define EXF_FLWANTED 0x08 /* someone asleep on freelist */
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#define EXF_BITS "\20\4FLWANTED\3WANTED\2NOCOALESCE\1FIXED"
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/* misc. flags passed to extent functions */
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#define EX_NOWAIT 0x0000 /* not safe to sleep */
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#define EX_WAITOK 0x0001 /* safe to sleep */
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#define EX_FAST 0x0002 /* take first fit in extent_alloc() */
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#define EX_CATCH 0x0004 /* catch signals while sleeping */
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#define EX_NOCOALESCE 0x0008 /* create a non-coalescing extent */
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#define EX_MALLOCOK 0x0010 /* safe to call malloc() */
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#define EX_WAITSPACE 0x0020 /* wait for space to become free */
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#define EX_BOUNDZERO 0x0040 /* boundary lines start at 0 */
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#define EX_CONFLICTOK 0x0080 /* allow conflicts */
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#define EX_FILLED 0x0100 /* create a filled extent */
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/*
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* Special place holders for "alignment" and "boundary" arguments,
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* in the event the caller doesn't wish to use those features.
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*/
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#define EX_NOALIGN 1 /* don't do alignment */
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#define EX_NOBOUNDARY 0 /* don't do boundary checking */
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#if defined(_KERNEL) || defined(_EXTENT_TESTING)
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#define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
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(ALIGN(sizeof(struct extent_fixed)) + \
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((ALIGN(sizeof(struct extent_region))) * \
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(_nregions)))
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void extent_print_all(void);
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struct extent *extent_create(char *, u_long, u_long, int,
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caddr_t, size_t, int);
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void extent_destroy(struct extent *);
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int extent_alloc_subregion(struct extent *, u_long, u_long,
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u_long, u_long, u_long, u_long, int, u_long *);
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int extent_alloc_subregion_with_descr(struct extent *, u_long, u_long,
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u_long, u_long, u_long, u_long, int, struct extent_region *,
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u_long *);
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int extent_alloc_region(struct extent *, u_long, u_long, int);
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int extent_alloc_region_with_descr(struct extent *, u_long, u_long,
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int, struct extent_region *);
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int extent_free(struct extent *, u_long, u_long, int);
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void extent_print(struct extent *);
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/* Simple case of extent_alloc_subregion() */
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#define extent_alloc(_ex, _size, _alignment, _skew, _boundary, \
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_flags, _result) \
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extent_alloc_subregion((_ex), (_ex)->ex_start, (_ex)->ex_end, \
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(_size), (_alignment), (_skew), (_boundary), (_flags), (_result))
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/* Simple case of extent_alloc_subregion_with_descr() */
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#define extent_alloc_with_descr(_ex, _size, _alignment, _skew, _boundary, \
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_flags, _region, _result) \
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extent_alloc_subregion_with_descr((_ex), (_ex)->ex_start, \
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(_ex)->ex_end, (_size), (_alignment), (_skew), (_boundary), \
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(_flags), (_region), (_result))
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#endif /* _KERNEL || _EXTENT_TESTING */
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#endif /* ! _SYS_EXTENT_H_ */
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