Annotation of sys/sys/extent.h, Revision 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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