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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
* Copyright 2018, Joyent, Inc.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ifndef _SYS_KMEM_H
#define _SYS_KMEM_H
#include <sys/types.h>
#include <sys/vmem.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Kernel memory allocator: DDI interfaces.
* See kmem_alloc(9F) for details.
*/
#define KM_SLEEP 0x0000 /* can block for memory; success guaranteed */
#define KM_NOSLEEP 0x0001 /* cannot block for memory; may fail */
#define KM_PANIC 0x0002 /* if memory cannot be allocated, panic */
#define KM_PUSHPAGE 0x0004 /* can block for memory; may use reserve */
#define KM_NORMALPRI 0x0008 /* with KM_NOSLEEP, lower priority allocation */
#define KM_VMFLAGS 0x00ff /* flags that must match VM_* flags */
#define KM_FLAGS 0xffff /* all settable kmem flags */
#if defined(_KERNEL) || defined(_FAKE_KERNEL)
extern void *kmem_alloc(size_t size, int kmflags);
extern void *kmem_zalloc(size_t size, int kmflags);
extern void kmem_free(void *buf, size_t size);
extern void *kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags);
extern void kmem_dump_init(size_t);
extern void kmem_dump_begin(void);
extern size_t kmem_dump_finish(char *buf, size_t size);
#endif /* _KERNEL */
/*
* Kernel memory allocator: private interfaces.
* These interfaces are still evolving.
* Do not use them in unbundled drivers.
*/
/*
* Flags for kmem_cache_create()
*/
#define KMC_NOTOUCH 0x00010000
#define KMC_NODEBUG 0x00020000
#define KMC_NOMAGAZINE 0x00040000
#define KMC_NOHASH 0x00080000
#define KMC_QCACHE 0x00100000
#define KMC_KMEM_ALLOC 0x00200000 /* internal use only */
#define KMC_IDENTIFIER 0x00400000 /* internal use only */
#define KMC_PREFILL 0x00800000
struct kmem_cache; /* cache structure is opaque to kmem clients */
typedef struct kmem_cache kmem_cache_t;
/* Client response to kmem move callback */
typedef enum kmem_cbrc {
KMEM_CBRC_YES,
KMEM_CBRC_NO,
KMEM_CBRC_LATER,
KMEM_CBRC_DONT_NEED,
KMEM_CBRC_DONT_KNOW
} kmem_cbrc_t;
#if defined(_KERNEL) || defined(_FAKE_KERNEL)
/*
* Helps clients implementing the move() callback to recognize known objects by
* testing a client-designated pointer member. Takes advantage of the fact that
* any scribbling to freed memory done by kmem is guaranteed to set one of the
* two low order bits.
*/
#define POINTER_IS_VALID(p) (!((uintptr_t)(p) & 0x3))
#define POINTER_INVALIDATE(pp) (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1))
extern int kmem_ready;
extern pgcnt_t kmem_reapahead;
extern size_t kmem_max_cached;
extern void kmem_init(void);
extern void kmem_thread_init(void);
extern void kmem_mp_init(void);
extern void kmem_reap(void);
extern void kmem_reap_idspace(void);
extern int kmem_debugging(void);
extern size_t kmem_avail(void);
extern size_t kmem_maxavail(void);
extern kmem_cache_t *kmem_cache_create(char *, size_t, size_t,
int (*)(void *, void *, int), void (*)(void *, void *),
void (*)(void *), void *, vmem_t *, int);
extern void kmem_cache_set_move(kmem_cache_t *,
kmem_cbrc_t (*)(void *, void *, size_t, void *));
extern void kmem_cache_destroy(kmem_cache_t *);
extern void *kmem_cache_alloc(kmem_cache_t *, int);
extern void kmem_cache_free(kmem_cache_t *, void *);
extern uint64_t kmem_cache_stat(kmem_cache_t *, char *);
extern boolean_t kmem_cache_reap_active(void);
extern void kmem_cache_reap_soon(kmem_cache_t *);
extern void kmem_cache_move_notify(kmem_cache_t *, void *);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_KMEM_H */
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