Annotation of sys/sys/extent.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: extent.h,v 1.8 2006/02/23 19:58:48 miod Exp $ */
2: /* $NetBSD: extent.h,v 1.6 1997/10/09 07:43:05 jtc Exp $ */
3:
4: /*-
5: * Copyright (c) 1996 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: #ifndef _SYS_EXTENT_H_
41: #define _SYS_EXTENT_H_
42:
43: #include <sys/queue.h>
44:
45: struct extent_region {
46: LIST_ENTRY(extent_region) er_link; /* link in region list */
47: u_long er_start; /* start of region */
48: u_long er_end; /* end of region */
49: int er_flags; /* misc. flags */
50: };
51:
52: /* er_flags */
53: #define ER_ALLOC 0x01 /* region descriptor dynamically allocated */
54:
55: struct extent {
56: char *ex_name; /* name of extent */
57: /* allocated regions in extent */
58: LIST_HEAD(, extent_region) ex_regions;
59: u_long ex_start; /* start of extent */
60: u_long ex_end; /* end of extent */
61: int ex_mtype; /* memory type */
62: int ex_flags; /* misc. information */
63:
64: LIST_ENTRY(extent) ex_link;
65: };
66:
67: struct extent_fixed {
68: struct extent fex_extent; /* MUST BE FIRST */
69: /* freelist of region descriptors */
70: LIST_HEAD(, extent_region) fex_freelist;
71: caddr_t fex_storage; /* storage space for descriptors */
72: size_t fex_storagesize; /* size of storage space */
73: };
74:
75: /* ex_flags; for internal use only */
76: #define EXF_FIXED 0x01 /* extent uses fixed storage */
77: #define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */
78: #define EXF_WANTED 0x04 /* someone asleep on extent */
79: #define EXF_FLWANTED 0x08 /* someone asleep on freelist */
80:
81: #define EXF_BITS "\20\4FLWANTED\3WANTED\2NOCOALESCE\1FIXED"
82:
83: /* misc. flags passed to extent functions */
84: #define EX_NOWAIT 0x00 /* not safe to sleep */
85: #define EX_WAITOK 0x01 /* safe to sleep */
86: #define EX_FAST 0x02 /* take first fit in extent_alloc() */
87: #define EX_CATCH 0x04 /* catch signals while sleeping */
88: #define EX_NOCOALESCE 0x08 /* create a non-coalescing extent */
89: #define EX_MALLOCOK 0x10 /* safe to call malloc() */
90: #define EX_WAITSPACE 0x20 /* wait for space to become free */
91: #define EX_BOUNDZERO 0x40 /* boundary lines start at 0 */
92:
93: /*
94: * Special place holders for "alignment" and "boundary" arguments,
95: * in the event the caller doesn't wish to use those features.
96: */
97: #define EX_NOALIGN 1 /* don't do alignment */
98: #define EX_NOBOUNDARY 0 /* don't do boundary checking */
99:
100: #if defined(_KERNEL) || defined(_EXTENT_TESTING)
101: #define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
102: (ALIGN(sizeof(struct extent_fixed)) + \
103: ((ALIGN(sizeof(struct extent_region))) * \
104: (_nregions)))
105:
106: void extent_print_all(void);
107:
108: struct extent *extent_create(char *, u_long, u_long, int,
109: caddr_t, size_t, int);
110: void extent_destroy(struct extent *);
111: int extent_alloc_subregion(struct extent *, u_long, u_long,
112: u_long, u_long, u_long, u_long, int, u_long *);
113: int extent_alloc_region(struct extent *, u_long, u_long, int);
114: int extent_free(struct extent *, u_long, u_long, int);
115: void extent_print(struct extent *);
116:
117: /* Simple case of extent_alloc_subregion() */
118: #define extent_alloc(_ex, _size, _alignment, _skew, _boundary, \
119: _flags, _result) \
120: extent_alloc_subregion((_ex), (_ex)->ex_start, (_ex)->ex_end, \
121: (_size), (_alignment), (_skew), (_boundary), (_flags), (_result))
122: #endif /* _KERNEL || _EXTENT_TESTING */
123:
124: #endif /* ! _SYS_EXTENT_H_ */
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