Merge from vendor branch HEIMDAL:
[dragonfly.git] / sys / sys / malloc.h
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1/*
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)malloc.h 8.5 (Berkeley) 5/3/95
34 * $FreeBSD: src/sys/sys/malloc.h,v 1.48.2.2 2002/03/16 02:19:16 archie Exp $
c397c465 35 * $DragonFly: src/sys/sys/malloc.h,v 1.20 2004/11/17 23:36:19 dillon Exp $
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36 */
37
38#ifndef _SYS_MALLOC_H_
39#define _SYS_MALLOC_H_
40
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41#ifndef _MACHINE_PARAM_H_
42#include <machine/param.h> /* for SMP_MAXCPU */
43#endif
3bf43adc 44
05220613 45#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
3bf43adc 46
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47#ifndef _MACHINE_VMPARAM_H_
48#include <machine/vmparam.h> /* for VM_MIN_KERNEL_ADDRESS */
49#endif
50
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51#define splmem splhigh
52
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53#ifndef _MACHINE_TYPES_H_
54#include <machine/types.h> /* vm_paddr_t */
55#endif
56
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57#endif /* _KERNEL */
58
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59/*
60 * flags to malloc.
61 */
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62#define M_RNOWAIT 0x0001 /* do not block */
63#define M_WAITOK 0x0002 /* wait for resources / alloc from cache */
97482992 64#define M_ZERO 0x0100 /* bzero() the allocation */
dc1fd4b3 65#define M_USE_RESERVE 0x0200 /* can eat into free list reserve */
a108bf71 66#define M_NULLOK 0x0400 /* ok to return NULL in M_WAITOK case */
ebe4a7b3 67#define M_PASSIVE_ZERO 0x0800 /* (internal to the slab code only) */
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68#define M_USE_INTERRUPT_RESERVE \
69 0x1000 /* can exhaust free list entirely */
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70
71/*
72 * M_NOWAIT has to be a set of flags for equivalence to prior use.
73 *
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74 * M_SYSALLOC should be used for any critical infrastructure allocations
75 * made by the kernel proper.
76 *
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77 * M_INTNOWAIT should be used for any critical infrastructure allocations
78 * made by interrupts. Such allocations can still fail but will not fail
79 * as often as M_NOWAIT.
80 *
81 * NOTE ON DRAGONFLY USE OF M_NOWAIT. In FreeBSD M_NOWAIT allocations
82 * almost always succeed. In DragonFly, however, there is a good chance
83 * that an allocation will fail. M_NOWAIT should only be used when
84 * allocations can fail without any serious detriment to the system.
dc1fd4b3 85 *
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86 * Note that allocations made from (preempted) interrupts will attempt to
87 * use pages from the VM PAGE CACHE (PQ_CACHE) (i.e. those associated with
88 * objects). This is automatic.
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89 */
90
91#define M_INTNOWAIT (M_RNOWAIT|M_USE_RESERVE|M_USE_INTERRUPT_RESERVE)
92#define M_SYSNOWAIT (M_RNOWAIT|M_USE_RESERVE)
93#define M_INTWAIT (M_WAITOK|M_USE_RESERVE|M_USE_INTERRUPT_RESERVE)
94#define M_SYSWAIT (M_WAITOK|M_USE_RESERVE)
95
96#define M_NOWAIT M_INTNOWAIT
dc1fd4b3 97#define M_SYSALLOC M_SYSWAIT
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98
99#define M_MAGIC 877983977 /* time when first defined :-) */
100
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101/*
102 * The malloc tracking structure. Note that per-cpu entries must be
103 * aggregated for accurate statistics, they do not actually break the
104 * stats down by cpu (e.g. the cpu freeing memory will subtract from
105 * its slot, not the originating cpu's slot).
106 *
107 * SMP_MAXCPU is used so modules which use malloc remain compatible
108 * between UP and SMP.
109 */
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110struct malloc_type {
111 struct malloc_type *ks_next; /* next in list */
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112 long ks_memuse[SMP_MAXCPU]; /* total memory held in bytes */
113 long ks_loosememuse; /* (inaccurate) aggregate memuse */
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114 long ks_limit; /* most that are allowed to exist */
115 long ks_size; /* sizes of this thing that are allocated */
bba6a44d 116 long ks_inuse[SMP_MAXCPU]; /* # of allocs currently in use */
05220613 117 __int64_t ks_calls; /* total packets of this type ever allocated */
984263bc 118 long ks_maxused; /* maximum number ever used */
05220613 119 __uint32_t ks_magic; /* if it's not magic, don't touch it */
984263bc 120 const char *ks_shortdesc; /* short description */
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121 __uint16_t ks_limblocks; /* number of times blocked for hitting limit */
122 __uint16_t ks_mapblocks; /* number of times blocked for kernel map */
bba6a44d 123 long ks_reserved[4]; /* future use (module compatibility) */
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124};
125
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126typedef struct malloc_type *malloc_type_t;
127
05220613 128#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
a108bf71 129
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130#define MALLOC_DEFINE(type, shortdesc, longdesc) \
131 struct malloc_type type[1] = { \
58661e79 132 { NULL, { 0 }, 0, 0, 0, { 0 }, 0, 0, M_MAGIC, shortdesc, 0, 0, { 0 } } \
05220613 133 }; \
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134 SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_ANY, malloc_init, type); \
135 SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY, malloc_uninit, type)
136
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137#else
138
139#define MALLOC_DEFINE(type, shortdesc, longdesc) \
140 struct malloc_type type[1] = { \
141 { NULL, { 0 }, 0, 0, 0, { 0 }, 0, 0, M_MAGIC, shortdesc, 0, 0 } \
142 };
143
144#endif
145
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146#define MALLOC_DECLARE(type) \
147 extern struct malloc_type type[1]
148
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149#ifdef _KERNEL
150
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151MALLOC_DECLARE(M_CACHE);
152MALLOC_DECLARE(M_DEVBUF);
153MALLOC_DECLARE(M_TEMP);
154
155MALLOC_DECLARE(M_IP6OPT); /* for INET6 */
156MALLOC_DECLARE(M_IP6NDP); /* for INET6 */
984263bc 157
05220613 158#endif /* _KERNEL */
a108bf71 159
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160/*
161 * Array of descriptors that describe the contents of each page
162 */
163struct kmemusage {
bba6a44d 164 short ku_cpu; /* cpu index */
984263bc 165 union {
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166 __int16_t freecnt;/* for small allocations, free pieces in page */
167 __int16_t pagecnt;/* for large allocations, pages alloced */
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168 } ku_un;
169};
170#define ku_freecnt ku_un.freecnt
171#define ku_pagecnt ku_un.pagecnt
172
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173#ifdef _KERNEL
174
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175#define MINALLOCSIZE sizeof(void *)
176
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177/*
178 * Turn virtual addresses into kmem map indices
179 */
074dcfe8 180#define btokup(addr) (&kmemusage[((caddr_t)(addr) - (caddr_t)VM_MIN_KERNEL_ADDRESS) >> PAGE_SHIFT])
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181
182/*
183 * Deprecated macro versions of not-quite-malloc() and free().
184 */
185#define MALLOC(space, cast, size, type, flags) \
186 (space) = (cast)malloc((u_long)(size), (type), (flags))
187#define FREE(addr, type) free((addr), (type))
188
189/*
190 * XXX this should be declared in <sys/uio.h>, but that tends to fail
191 * because <sys/uio.h> is included in a header before the source file
192 * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
193 */
194MALLOC_DECLARE(M_IOV);
195
196/* XXX struct malloc_type is unused for contig*(). */
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197void contigfree (void *addr, unsigned long size,
198 struct malloc_type *type);
199void *contigmalloc (unsigned long size, struct malloc_type *type,
6ef943a3 200 int flags, vm_paddr_t low, vm_paddr_t high,
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201 unsigned long alignment, unsigned long boundary);
202void free (void *addr, struct malloc_type *type);
203void *malloc (unsigned long size, struct malloc_type *type, int flags);
204void malloc_init (void *);
205void malloc_uninit (void *);
206void *realloc (void *addr, unsigned long size,
207 struct malloc_type *type, int flags);
208void *reallocf (void *addr, unsigned long size,
209 struct malloc_type *type, int flags);
1ac06773 210char *strdup (const char *, struct malloc_type *);
a108bf71 211
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212#endif /* _KERNEL */
213
214#endif /* !_SYS_MALLOC_H_ */