2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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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 $
35 * $DragonFly: src/sys/sys/malloc.h,v 1.20 2004/11/17 23:36:19 dillon Exp $
38 #ifndef _SYS_MALLOC_H_
39 #define _SYS_MALLOC_H_
41 #ifndef _MACHINE_PARAM_H_
42 #include <machine/param.h> /* for SMP_MAXCPU */
45 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
47 #ifndef _MACHINE_VMPARAM_H_
48 #include <machine/vmparam.h> /* for VM_MIN_KERNEL_ADDRESS */
51 #define splmem splhigh
53 #ifndef _MACHINE_TYPES_H_
54 #include <machine/types.h> /* vm_paddr_t */
62 #define M_RNOWAIT 0x0001 /* do not block */
63 #define M_WAITOK 0x0002 /* wait for resources / alloc from cache */
64 #define M_ZERO 0x0100 /* bzero() the allocation */
65 #define M_USE_RESERVE 0x0200 /* can eat into free list reserve */
66 #define M_NULLOK 0x0400 /* ok to return NULL in M_WAITOK case */
67 #define M_PASSIVE_ZERO 0x0800 /* (internal to the slab code only) */
68 #define M_USE_INTERRUPT_RESERVE \
69 0x1000 /* can exhaust free list entirely */
72 * M_NOWAIT has to be a set of flags for equivalence to prior use.
74 * M_SYSALLOC should be used for any critical infrastructure allocations
75 * made by the kernel proper.
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.
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.
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.
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)
96 #define M_NOWAIT M_INTNOWAIT
97 #define M_SYSALLOC M_SYSWAIT
99 #define M_MAGIC 877983977 /* time when first defined :-) */
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).
107 * SMP_MAXCPU is used so modules which use malloc remain compatible
108 * between UP and SMP.
111 struct malloc_type *ks_next; /* next in list */
112 long ks_memuse[SMP_MAXCPU]; /* total memory held in bytes */
113 long ks_loosememuse; /* (inaccurate) aggregate memuse */
114 long ks_limit; /* most that are allowed to exist */
115 long ks_size; /* sizes of this thing that are allocated */
116 long ks_inuse[SMP_MAXCPU]; /* # of allocs currently in use */
117 __int64_t ks_calls; /* total packets of this type ever allocated */
118 long ks_maxused; /* maximum number ever used */
119 __uint32_t ks_magic; /* if it's not magic, don't touch it */
120 const char *ks_shortdesc; /* short description */
121 __uint16_t ks_limblocks; /* number of times blocked for hitting limit */
122 __uint16_t ks_mapblocks; /* number of times blocked for kernel map */
123 long ks_reserved[4]; /* future use (module compatibility) */
126 typedef struct malloc_type *malloc_type_t;
128 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
130 #define MALLOC_DEFINE(type, shortdesc, longdesc) \
131 struct malloc_type type[1] = { \
132 { NULL, { 0 }, 0, 0, 0, { 0 }, 0, 0, M_MAGIC, shortdesc, 0, 0, { 0 } } \
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)
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 } \
146 #define MALLOC_DECLARE(type) \
147 extern struct malloc_type type[1]
151 MALLOC_DECLARE(M_CACHE);
152 MALLOC_DECLARE(M_DEVBUF);
153 MALLOC_DECLARE(M_TEMP);
155 MALLOC_DECLARE(M_IP6OPT); /* for INET6 */
156 MALLOC_DECLARE(M_IP6NDP); /* for INET6 */
161 * Array of descriptors that describe the contents of each page
164 short ku_cpu; /* cpu index */
166 __int16_t freecnt;/* for small allocations, free pieces in page */
167 __int16_t pagecnt;/* for large allocations, pages alloced */
170 #define ku_freecnt ku_un.freecnt
171 #define ku_pagecnt ku_un.pagecnt
175 #define MINALLOCSIZE sizeof(void *)
178 * Turn virtual addresses into kmem map indices
180 #define btokup(addr) (&kmemusage[((caddr_t)(addr) - (caddr_t)VM_MIN_KERNEL_ADDRESS) >> PAGE_SHIFT])
183 * Deprecated macro versions of not-quite-malloc() and free().
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))
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.
194 MALLOC_DECLARE(M_IOV);
196 /* XXX struct malloc_type is unused for contig*(). */
197 void contigfree (void *addr, unsigned long size,
198 struct malloc_type *type);
199 void *contigmalloc (unsigned long size, struct malloc_type *type,
200 int flags, vm_paddr_t low, vm_paddr_t high,
201 unsigned long alignment, unsigned long boundary);
202 void free (void *addr, struct malloc_type *type);
203 void *malloc (unsigned long size, struct malloc_type *type, int flags);
204 void malloc_init (void *);
205 void malloc_uninit (void *);
206 void *realloc (void *addr, unsigned long size,
207 struct malloc_type *type, int flags);
208 void *reallocf (void *addr, unsigned long size,
209 struct malloc_type *type, int flags);
210 char *strdup (const char *, struct malloc_type *);
214 #endif /* !_SYS_MALLOC_H_ */