osfmk/kern/zalloc.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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  23  * Please see the License for the specific language governing rights and
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58 /*
  59  *      File:   zalloc.h
  60  *      Author: Avadis Tevanian, Jr.
  61  *      Date:    1985
  62  *
  63  */
  64
  65 #ifdef  KERNEL_PRIVATE
  66
  67 #ifndef _KERN_ZALLOC_H_
  68 #define _KERN_ZALLOC_H_
  69
  70 #include <mach/machine/vm_types.h>
  71 #include <kern/kern_types.h>
  72 #include <sys/cdefs.h>
  73
  74 #ifdef  MACH_KERNEL_PRIVATE
  75
  76 #include <zone_debug.h>
  77 #include <mach_kdb.h>
  78 #include <kern/lock.h>
  79 #include <kern/queue.h>
  80 #include <kern/call_entry.h>
  81
  82 /*
  83  *      A zone is a collection of fixed size blocks for which there
  84  *      is fast allocation/deallocation access.  Kernel routines can
  85  *      use zones to manage data structures dynamically, creating a zone
  86  *      for each type of data structure to be managed.
  87  *
  88  */
  89
  90 struct zone {
  91         int             count;          /* Number of elements used now */
  92         vm_offset_t     free_elements;
  93         decl_mutex_data(,lock)          /* generic lock */
  94         vm_size_t       cur_size;       /* current memory utilization */
  95         vm_size_t       max_size;       /* how large can this zone grow */
  96         vm_size_t       elem_size;      /* size of an element */
  97         vm_size_t       alloc_size;     /* size used for more memory */
  98         unsigned int
  99         /* boolean_t */ exhaustible :1, /* (F) merely return if empty? */
 100         /* boolean_t */ collectable :1, /* (F) garbage collect empty pages */
 101         /* boolean_t */ expandable :1,  /* (T) expand zone (with message)? */
 102         /* boolean_t */ allows_foreign :1,/* (F) allow non-zalloc space */
 103         /* boolean_t */ doing_alloc :1, /* is zone expanding now? */
 104         /* boolean_t */ waiting :1,     /* is thread waiting for expansion? */
 105         /* boolean_t */ async_pending :1,       /* asynchronous allocation pending? */
 106         /* boolean_t */ doing_gc :1;    /* garbage collect in progress? */
 107         struct zone *   next_zone;      /* Link for all-zones list */
 108         call_entry_data_t       call_async_alloc;       /* callout for asynchronous alloc */
 109         const char      *zone_name;     /* a name for the zone */
 110 #if     ZONE_DEBUG
 111         queue_head_t    active_zones;   /* active elements */
 112 #endif  /* ZONE_DEBUG */
 113 };
 114
 115 extern void             zone_gc(void);
 116 extern void             consider_zone_gc(void);
 117
 118 /* Steal memory for zone module */
 119 extern void             zone_steal_memory(void);
 120
 121 /* Bootstrap zone module (create zone zone) */
 122 extern void             zone_bootstrap(void);
 123
 124 /* Init zone module */
 125 extern void             zone_init(
 126                                         vm_size_t       map_size);
 127
 128 /* Stack use statistics */
 129 extern void             stack_fake_zone_info(
 130                                         int                     *count,
 131                                         vm_size_t       *cur_size,
 132                                         vm_size_t       *max_size,
 133                                         vm_size_t       *elem_size,
 134                                         vm_size_t       *alloc_size,
 135                                         int                     *collectable,
 136                                         int                     *exhaustable);
 137
 138 #if             ZONE_DEBUG
 139
 140 #if             MACH_KDB
 141
 142 extern void *   next_element(
 143                                 zone_t          z,
 144                                 void            *elt);
 145
 146 extern void *   first_element(
 147                                 zone_t          z);
 148
 149 #endif  /* MACH_KDB */
 150
 151 extern void             zone_debug_enable(
 152                                 zone_t          z);
 153
 154 extern void             zone_debug_disable(
 155                                 zone_t          z);
 156
 157 #endif  /* ZONE_DEBUG */
 158
 159 #endif  /* MACH_KERNEL_PRIVATE */
 160
 161 __BEGIN_DECLS
 162
 163 #ifdef  XNU_KERNEL_PRIVATE
 164
 165 /* Allocate from zone */
 166 extern void *   zalloc(
 167                                         zone_t          zone);
 168
 169 /* Free zone element */
 170 extern void             zfree(
 171                                         zone_t          zone,
 172                                         void            *elem);
 173
 174 /* Create zone */
 175 extern zone_t   zinit(
 176                                         vm_size_t       size,           /* the size of an element */
 177                                         vm_size_t       maxmem,         /* maximum memory to use */
 178                                         vm_size_t       alloc,          /* allocation size */
 179                                         const char      *name);         /* a name for the zone */
 180
 181
 182 /* Non-blocking version of zalloc */
 183 extern void *   zalloc_noblock(
 184                                         zone_t          zone);
 185
 186 /* direct (non-wrappered) interface */
 187 extern void *   zalloc_canblock(
 188                                         zone_t          zone,
 189                                         boolean_t       canblock);
 190
 191 /* Get from zone free list */
 192 extern void *   zget(
 193                                         zone_t          zone);
 194
 195 /* Fill zone with memory */
 196 extern void             zcram(
 197                                         zone_t          zone,
 198                                         void            *newmem,
 199                                         vm_size_t       size);
 200
 201 /* Initially fill zone with specified number of elements */
 202 extern int              zfill(
 203                                         zone_t          zone,
 204                                         int                     nelem);
 205
 206 /* Change zone parameters */
 207 extern void             zone_change(
 208                                         zone_t                  zone,
 209                                         unsigned int    item,
 210                                         boolean_t               value);
 211
 212 /* Item definitions */
 213 #define Z_EXHAUST       1       /* Make zone exhaustible        */
 214 #define Z_COLLECT       2       /* Make zone collectable        */
 215 #define Z_EXPAND        3       /* Make zone expandable         */
 216 #define Z_FOREIGN       4       /* Allow collectable zone to contain foreign elements */
 217
 218 /* Preallocate space for zone from zone map */
 219 extern void             zprealloc(
 220                                         zone_t          zone,
 221                                         vm_size_t       size);
 222
 223 extern integer_t        zone_free_count(
 224                                                 zone_t          zone);
 225
 226 #endif  /* XNU_KERNEL_PRIVATE */
 227
 228 __END_DECLS
 229
 230 #endif  /* _KERN_ZALLOC_H_ */
 231
 232 #endif  /* KERNEL_PRIVATE */