1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2012 by Delphix. All rights reserved. 25 * Copyright 2013 Nexenta Systems, Inc. All rights reserved. 26 * Copyright 2022 Joyent, Inc. 27 */ 28 29 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 30 /* All Rights Reserved */ 31 32 #ifndef _SYS_KMEM_H 33 #define _SYS_KMEM_H 34 35 #include <sys/types.h> 36 #include <sys/vmem.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /* 43 * Kernel memory allocator: DDI interfaces. 44 * See kmem_alloc(9F) for details. 45 */ 46 47 #define KM_SLEEP 0x0000 /* can block for memory; success guaranteed */ 48 #define KM_NOSLEEP 0x0001 /* cannot block for memory; may fail */ 49 #define KM_PANIC 0x0002 /* if memory cannot be allocated, panic */ 50 #define KM_PUSHPAGE 0x0004 /* can block for memory; may use reserve */ 51 #define KM_NORMALPRI 0x0008 /* with KM_NOSLEEP, lower priority allocation */ 52 #define KM_NOSLEEP_LAZY (KM_NOSLEEP | KM_NORMALPRI) /* Syntactic sugar. */ 53 #define KM_VMFLAGS 0x00ff /* flags that must match VM_* flags */ 54 55 #define KM_FLAGS 0xffff /* all settable kmem flags */ 56 57 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 58 59 extern void *kmem_alloc(size_t size, int kmflags); 60 extern void *kmem_zalloc(size_t size, int kmflags); 61 extern void kmem_free(void *buf, size_t size); 62 extern void *kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags); 63 extern void kmem_dump_init(size_t); 64 extern void kmem_dump_begin(void); 65 extern size_t kmem_dump_finish(char *buf, size_t size); 66 extern void *kmem_rezalloc(void *, size_t, size_t, int); 67 68 #endif /* _KERNEL */ 69 70 /* 71 * Kernel memory allocator: private interfaces. 72 * These interfaces are still evolving. 73 * Do not use them in unbundled drivers. 74 */ 75 76 /* 77 * Flags for kmem_cache_create() 78 */ 79 #define KMC_NOTOUCH 0x00010000 80 #define KMC_NODEBUG 0x00020000 81 #define KMC_NOMAGAZINE 0x00040000 82 #define KMC_NOHASH 0x00080000 83 #define KMC_QCACHE 0x00100000 84 #define KMC_KMEM_ALLOC 0x00200000 /* internal use only */ 85 #define KMC_IDENTIFIER 0x00400000 /* internal use only */ 86 #define KMC_PREFILL 0x00800000 87 88 struct kmem_cache; /* cache structure is opaque to kmem clients */ 89 90 typedef struct kmem_cache kmem_cache_t; 91 92 /* Client response to kmem move callback */ 93 typedef enum kmem_cbrc { 94 KMEM_CBRC_YES, 95 KMEM_CBRC_NO, 96 KMEM_CBRC_LATER, 97 KMEM_CBRC_DONT_NEED, 98 KMEM_CBRC_DONT_KNOW 99 } kmem_cbrc_t; 100 101 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 102 103 /* 104 * Helps clients implementing the move() callback to recognize known objects by 105 * testing a client-designated pointer member. Takes advantage of the fact that 106 * any scribbling to freed memory done by kmem is guaranteed to set one of the 107 * two low order bits. 108 */ 109 #define POINTER_IS_VALID(p) (!((uintptr_t)(p) & 0x3)) 110 #define POINTER_INVALIDATE(pp) (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1)) 111 112 extern int kmem_ready; 113 extern pgcnt_t kmem_reapahead; 114 extern size_t kmem_max_cached; 115 116 extern void kmem_init(void); 117 extern void kmem_thread_init(void); 118 extern void kmem_mp_init(void); 119 extern void kmem_reap(void); 120 extern void kmem_reap_idspace(void); 121 extern int kmem_debugging(void); 122 extern size_t kmem_avail(void); 123 extern size_t kmem_maxavail(void); 124 125 extern kmem_cache_t *kmem_cache_create(char *, size_t, size_t, 126 int (*)(void *, void *, int), void (*)(void *, void *), 127 void (*)(void *), void *, vmem_t *, int); 128 extern void kmem_cache_set_move(kmem_cache_t *, 129 kmem_cbrc_t (*)(void *, void *, size_t, void *)); 130 extern void kmem_cache_destroy(kmem_cache_t *); 131 extern void *kmem_cache_alloc(kmem_cache_t *, int); 132 extern void kmem_cache_free(kmem_cache_t *, void *); 133 extern uint64_t kmem_cache_stat(kmem_cache_t *, char *); 134 extern boolean_t kmem_cache_reap_active(void); 135 extern void kmem_cache_reap_soon(kmem_cache_t *); 136 extern void kmem_cache_move_notify(kmem_cache_t *, void *); 137 138 #endif /* _KERNEL */ 139 140 #ifdef __cplusplus 141 } 142 #endif 143 144 #endif /* _SYS_KMEM_H */ 145