[apple/xnu.git] / osfmk / kern / zalloc.h

/*
 * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 *	File:	zalloc.h
 *	Author:	Avadis Tevanian, Jr.
 *	Date:	 1985
 *
 */

#ifdef	KERNEL_PRIVATE

#ifndef	_KERN_ZALLOC_H_
#define _KERN_ZALLOC_H_

#include <mach/machine/vm_types.h>
#include <kern/kern_types.h>
#include <sys/cdefs.h>

#ifdef	MACH_KERNEL_PRIVATE

#include <zone_debug.h>
#include <kern/locks.h>
#include <kern/queue.h>
#include <kern/thread_call.h>
#include <kern/btlog.h>

#if	CONFIG_GZALLOC
typedef struct gzalloc_data {
	uint32_t	gzfc_index;
	vm_offset_t 	*gzfc;
} gzalloc_data_t;
#endif

/*
 *	A zone is a collection of fixed size blocks for which there
 *	is fast allocation/deallocation access.  Kernel routines can
 *	use zones to manage data structures dynamically, creating a zone
 *	for each type of data structure to be managed.
 *
 */

struct zone_free_element;
struct zone_page_metadata;

struct zone {
	struct zone_free_element *free_elements;	/* free elements directly linked */
	struct {
		queue_head_t			any_free_foreign;	/* foreign pages crammed into zone */
		queue_head_t			all_free;
		queue_head_t			intermediate;
		queue_head_t			all_used;
	} pages;		/* list of zone_page_metadata structs, which maintain per-page free element lists */
	int		count;		/* Number of elements used now */
	int		countfree;	/* Number of free elements */
	int 	count_all_free_pages;  /* Number of pages collectable by GC */
	lck_attr_t      lock_attr;	/* zone lock attribute */
	decl_lck_mtx_data(,lock)	/* zone lock */
	lck_mtx_ext_t   lock_ext;	/* placeholder for indirect mutex */
	vm_size_t	cur_size;	/* current memory utilization */
	vm_size_t	max_size;	/* how large can this zone grow */
	vm_size_t	elem_size;	/* size of an element */
	vm_size_t	alloc_size;	/* size used for more memory */
	uint64_t	page_count __attribute__((aligned(8)));   /* number of pages used by this zone */
	uint64_t	sum_count;	/* count of allocs (life of zone) */
	uint32_t
	/* boolean_t */ exhaustible        :1,	/* (F) merely return if empty? */
	/* boolean_t */	collectable        :1,	/* (F) garbage collect empty pages */
	/* boolean_t */	expandable         :1,	/* (T) expand zone (with message)? */
	/* boolean_t */ allows_foreign     :1,  /* (F) allow non-zalloc space */
	/* boolean_t */	doing_alloc_without_vm_priv:1,	/* is zone expanding now via a non-vm_privileged thread? */
	/* boolean_t */ doing_alloc_with_vm_priv:1, /* is zone expanding now via a vm_privileged thread? */
	/* boolean_t */	waiting            :1,	/* is thread waiting for expansion? */
	/* boolean_t */	async_pending      :1,	/* asynchronous allocation pending? */
	/* boolean_t */ zleak_on           :1,	/* Are we collecting allocation information? */
	/* boolean_t */	caller_acct        :1,  /* do we account allocation/free to the caller? */  
	/* boolean_t */ noencrypt          :1,
	/* boolean_t */	no_callout         :1,
	/* boolean_t */	async_prio_refill  :1,
	/* boolean_t */	gzalloc_exempt     :1,
	/* boolean_t */	alignment_required :1,
	/* boolean_t */ zone_logging	   :1,	/* Enable zone logging for this zone. */
	/* boolean_t */ zone_replenishing  :1,
	/* future    */ _reserved          :15;

	int		index;		/* index into zone_info arrays for this zone */
	const char	*zone_name;	/* a name for the zone */

#if CONFIG_ZLEAKS
	uint32_t zleak_capture;		/* per-zone counter for capturing every N allocations */
#endif /* CONFIG_ZLEAKS */
	uint32_t zp_count;              /* counter for poisoning every N frees */
	vm_size_t	prio_refill_watermark;
	thread_t	zone_replenish_thread;
#if	CONFIG_GZALLOC
	gzalloc_data_t	gz;
#endif /* CONFIG_GZALLOC */

	btlog_t		*zlog_btlog;		/* zone logging structure to hold stacks and element references to those stacks. */
};

/*
 *	structure for tracking zone usage
 *	Used either one per task/thread for all zones or <per-task,per-zone>.
 */
typedef struct zinfo_usage_store_t {
	/* These fields may be updated atomically, and so must be 8 byte aligned */
	uint64_t	alloc __attribute__((aligned(8)));		/* allocation counter */
	uint64_t	free __attribute__((aligned(8)));		/* free counter */
} zinfo_usage_store_t;

extern void		zone_gc(void);
extern void		consider_zone_gc(void);

/* Bootstrap zone module (create zone zone) */
extern void		zone_bootstrap(void);

/* Init zone module */
extern void		zone_init(
					vm_size_t	map_size);

/* Stack use statistics */
extern void		stack_fake_zone_init(int zone_index);
extern void		stack_fake_zone_info(
					int			*count, 
					vm_size_t	*cur_size, 
					vm_size_t	*max_size,
					vm_size_t	*elem_size,
					vm_size_t	*alloc_size, 
					uint64_t	*sum_size,
					int			*collectable, 
					int			*exhaustable,
					int		*caller_acct);

#if		ZONE_DEBUG

extern void		zone_debug_enable(
				zone_t		z);

extern void		zone_debug_disable(
				zone_t		z);

#define zone_debug_enabled(z) z->active_zones.next
#define	ROUNDUP(x,y)		((((x)+(y)-1)/(y))*(y))
#define ZONE_DEBUG_OFFSET	ROUNDUP(sizeof(queue_chain_t),16)
#endif	/* ZONE_DEBUG */

extern unsigned int            num_zones;
extern struct zone             zone_array[];

#endif	/* MACH_KERNEL_PRIVATE */

__BEGIN_DECLS


/* Item definitions for zalloc/zinit/zone_change */
#define Z_EXHAUST	1	/* Make zone exhaustible	*/
#define Z_COLLECT	2	/* Make zone collectable	*/
#define Z_EXPAND	3	/* Make zone expandable		*/
#define	Z_FOREIGN	4	/* Allow collectable zone to contain foreign elements */
#define Z_CALLERACCT	5	/* Account alloc/free against the caller */
#define Z_NOENCRYPT	6	/* Don't encrypt zone during hibernation */
#define Z_NOCALLOUT 	7	/* Don't asynchronously replenish the zone via callouts */
#define Z_ALIGNMENT_REQUIRED 8
#define Z_GZALLOC_EXEMPT 9	/* Not tracked in guard allocation mode */


#ifdef	XNU_KERNEL_PRIVATE

extern vm_offset_t     zone_map_min_address;
extern vm_offset_t     zone_map_max_address;


/* Non-waiting for memory version of zalloc */
extern void *	zalloc_nopagewait(
					zone_t		zone);

/* Non-blocking version of zalloc */
extern void *	zalloc_noblock(
					zone_t		zone);

/* selective version of zalloc */
extern void *	zalloc_canblock(
					zone_t		zone,
					boolean_t	canblock);

/* Get from zone free list */
extern void *	zget(
					zone_t		zone);

/* Fill zone with memory */
extern void		zcram(
					zone_t		zone,
					vm_offset_t	newmem,
					vm_size_t	size);

/* Initially fill zone with specified number of elements */
extern int		zfill(
					zone_t		zone,
					int			nelem);

extern void		zone_prio_refill_configure(zone_t, vm_size_t);

/* See above/top of file. Z_* definitions moved so they would be usable by kexts */

/* Preallocate space for zone from zone map */
extern void		zprealloc(
					zone_t		zone,
					vm_size_t	size);

extern integer_t	zone_free_count(
						zone_t		zone);

extern vm_size_t 	zone_element_size(
						void 		*addr,
						zone_t 		*z);

/*
 * MAX_ZTRACE_DEPTH configures how deep of a stack trace is taken on each zalloc in the zone of interest.  15
 * levels is usually enough to get past all the layers of code in kalloc and IOKit and see who the actual
 * caller is up above these lower levels.
 *
 * This is used both for the zone leak detector and the zone corruption log.
 */

#define MAX_ZTRACE_DEPTH	15

/* 
 *  Structure for keeping track of a backtrace, used for leak detection.
 *  This is in the .h file because it is used during panic, see kern/debug.c
 *  A non-zero size indicates that the trace is in use.
 */
struct ztrace {
	vm_size_t		zt_size;			/* How much memory are all the allocations referring to this trace taking up? */
	uint32_t		zt_depth;			/* depth of stack (0 to MAX_ZTRACE_DEPTH) */
	void*			zt_stack[MAX_ZTRACE_DEPTH];	/* series of return addresses from OSBacktrace */
	uint32_t		zt_collisions;			/* How many times did a different stack land here while it was occupied? */
	uint32_t		zt_hit_count;			/* for determining effectiveness of hash function */
};

#if CONFIG_ZLEAKS

/* support for the kern.zleak.* sysctls */

extern kern_return_t zleak_activate(void);
extern vm_size_t zleak_max_zonemap_size;
extern vm_size_t zleak_global_tracking_threshold;
extern vm_size_t zleak_per_zone_tracking_threshold;

extern int get_zleak_state(void);

#endif	/* CONFIG_ZLEAKS */

/* These functions used for leak detection both in zalloc.c and mbuf.c */
extern uintptr_t hash_mix(uintptr_t);
extern uint32_t hashbacktrace(uintptr_t *, uint32_t, uint32_t);
extern uint32_t hashaddr(uintptr_t, uint32_t);

#define lock_zone(zone)					\
MACRO_BEGIN						\
	lck_mtx_lock_spin(&(zone)->lock);		\
MACRO_END

#define unlock_zone(zone)				\
MACRO_BEGIN						\
	lck_mtx_unlock(&(zone)->lock);			\
MACRO_END

#if	CONFIG_GZALLOC
void gzalloc_init(vm_size_t);
void gzalloc_zone_init(zone_t);
void gzalloc_configure(void);
void gzalloc_reconfigure(zone_t);
boolean_t gzalloc_enabled(void);

vm_offset_t gzalloc_alloc(zone_t, boolean_t);
boolean_t gzalloc_free(zone_t, void *);
boolean_t gzalloc_element_size(void *, zone_t *, vm_size_t *);
#endif /* CONFIG_GZALLOC */

/* Callbacks for btlog lock/unlock */
void zlog_btlog_lock(__unused void *);
void zlog_btlog_unlock(__unused void *);

#endif	/* XNU_KERNEL_PRIVATE */

/* Allocate from zone */
extern void *	zalloc(
					zone_t		zone);

/* Free zone element */
extern void		zfree(
					zone_t		zone,
					void 		*elem);

/* Create zone */
extern zone_t	zinit(
					vm_size_t	size,		/* the size of an element */
					vm_size_t	maxmem,		/* maximum memory to use */
					vm_size_t	alloc,		/* allocation size */
					const char	*name);		/* a name for the zone */

/* Change zone parameters */
extern void		zone_change(
					zone_t			zone,
					unsigned int	item,
					boolean_t		value);


__END_DECLS

#endif	/* _KERN_ZALLOC_H_ */

#endif	/* KERNEL_PRIVATE */
Commit	Line	Data
1c79356b	1	/*
fe8ab488	2	* Copyright (c) 2000-2014 Apple Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	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
91447636 A	65	#ifdef KERNEL_PRIVATE
91447636 A	66
1c79356b A	67	#ifndef _KERN_ZALLOC_H_
	68	#define _KERN_ZALLOC_H_
	69
	70	#include <mach/machine/vm_types.h>
	71	#include <kern/kern_types.h>
91447636	72	#include <sys/cdefs.h>
9bccf70c A	73
	74	#ifdef MACH_KERNEL_PRIVATE
	75
1c79356b	76	#include <zone_debug.h>
2d21ac55	77	#include <kern/locks.h>
1c79356b	78	#include <kern/queue.h>
316670eb	79	#include <kern/thread_call.h>
39037602	80	#include <kern/btlog.h>
316670eb A	81
	82	#if CONFIG_GZALLOC
	83	typedef struct gzalloc_data {
	84	uint32_t gzfc_index;
	85	vm_offset_t *gzfc;
	86	} gzalloc_data_t;
	87	#endif
1c79356b A	88
	89	/*
	90	* A zone is a collection of fixed size blocks for which there
	91	* is fast allocation/deallocation access. Kernel routines can
	92	* use zones to manage data structures dynamically, creating a zone
	93	* for each type of data structure to be managed.
	94	*
	95	*/
	96
39236c6e A	97	struct zone_free_element;
	98	struct zone_page_metadata;
	99
1c79356b	100	struct zone {
39236c6e A	101	struct zone_free_element free_elements; / free elements directly linked */
	102	struct {
	103	queue_head_t any_free_foreign; /* foreign pages crammed into zone */
	104	queue_head_t all_free;
	105	queue_head_t intermediate;
	106	queue_head_t all_used;
	107	} pages; /* list of zone_page_metadata structs, which maintain per-page free element lists */
1c79356b	108	int count; /* Number of elements used now */
39236c6e	109	int countfree; /* Number of free elements */
39037602	110	int count_all_free_pages; /* Number of pages collectable by GC */
39236c6e	111	lck_attr_t lock_attr; /* zone lock attribute */
2d21ac55 A	112	decl_lck_mtx_data(,lock) /* zone lock */
2d21ac55 A	113	lck_mtx_ext_t lock_ext; /* placeholder for indirect mutex */
1c79356b A	114	vm_size_t cur_size; /* current memory utilization */
	115	vm_size_t max_size; /* how large can this zone grow */
	116	vm_size_t elem_size; /* size of an element */
	117	vm_size_t alloc_size; /* size used for more memory */
39236c6e	118	uint64_t page_count __attribute__((aligned(8))); /* number of pages used by this zone */
6d2010ae	119	uint64_t sum_count; /* count of allocs (life of zone) */
39236c6e A	120	uint32_t
	121	/* boolean_t / exhaustible :1, / (F) merely return if empty? */
	122	/* boolean_t / collectable :1, / (F) garbage collect empty pages */
	123	/* boolean_t / expandable :1, / (T) expand zone (with message)? */
	124	/* boolean_t / allows_foreign :1, / (F) allow non-zalloc space */
3e170ce0 A	125	/* boolean_t / doing_alloc_without_vm_priv:1, / is zone expanding now via a non-vm_privileged thread? */
3e170ce0 A	126	/* boolean_t / doing_alloc_with_vm_priv:1, / is zone expanding now via a vm_privileged thread? */
39236c6e A	127	/* boolean_t / waiting :1, / is thread waiting for expansion? */
	128	/* boolean_t / async_pending :1, / asynchronous allocation pending? */
	129	/* boolean_t / zleak_on :1, / Are we collecting allocation information? */
	130	/* boolean_t / caller_acct :1, / do we account allocation/free to the caller? */
39236c6e A	131	/* boolean_t */ noencrypt :1,
	132	/* boolean_t */ no_callout :1,
	133	/* boolean_t */ async_prio_refill :1,
	134	/* boolean_t */ gzalloc_exempt :1,
	135	/* boolean_t */ alignment_required :1,
39037602 A	136	/* boolean_t / zone_logging :1, / Enable zone logging for this zone. */
39037602 A	137	/* boolean_t */ zone_replenishing :1,
3e170ce0	138	/* future */ _reserved :15;
39236c6e	139
6d2010ae	140	int index; /* index into zone_info arrays for this zone */
91447636	141	const char zone_name; / a name for the zone */
6d2010ae A	142
6d2010ae A	143	#if CONFIG_ZLEAKS
316670eb	144	uint32_t zleak_capture; /* per-zone counter for capturing every N allocations */
6d2010ae	145	#endif /* CONFIG_ZLEAKS */
39236c6e	146	uint32_t zp_count; /* counter for poisoning every N frees */
7ddcb079 A	147	vm_size_t prio_refill_watermark;
7ddcb079 A	148	thread_t zone_replenish_thread;
316670eb A	149	#if CONFIG_GZALLOC
	150	gzalloc_data_t gz;
	151	#endif /* CONFIG_GZALLOC */
39037602 A	152
39037602 A	153	btlog_t zlog_btlog; / zone logging structure to hold stacks and element references to those stacks. */
1c79356b A	154	};
1c79356b A	155
6d2010ae A	156	/*
	157	* structure for tracking zone usage
	158	* Used either one per task/thread for all zones or <per-task,per-zone>.
	159	*/
	160	typedef struct zinfo_usage_store_t {
	161	/* These fields may be updated atomically, and so must be 8 byte aligned */
	162	uint64_t alloc __attribute__((aligned(8))); /* allocation counter */
	163	uint64_t free __attribute__((aligned(8))); /* free counter */
	164	} zinfo_usage_store_t;
6d2010ae	165
39037602 A	166	extern void zone_gc(void);
39037602 A	167	extern void consider_zone_gc(void);
1c79356b A	168
1c79356b A	169	/* Bootstrap zone module (create zone zone) */
39236c6e	170	extern void zone_bootstrap(void);
1c79356b A	171
1c79356b A	172	/* Init zone module */
91447636	173	extern void zone_init(
39236c6e	174	vm_size_t map_size);
1c79356b	175
91447636	176	/* Stack use statistics */
6d2010ae	177	extern void stack_fake_zone_init(int zone_index);
91447636 A	178	extern void stack_fake_zone_info(
	179	int *count,
	180	vm_size_t *cur_size,
	181	vm_size_t *max_size,
	182	vm_size_t *elem_size,
	183	vm_size_t *alloc_size,
6d2010ae	184	uint64_t *sum_size,
91447636	185	int *collectable,
6d2010ae A	186	int *exhaustable,
6d2010ae A	187	int *caller_acct);
1c79356b	188
91447636	189	#if ZONE_DEBUG
1c79356b	190
91447636 A	191	extern void zone_debug_enable(
	192	zone_t z);
	193
	194	extern void zone_debug_disable(
	195	zone_t z);
	196
316670eb A	197	#define zone_debug_enabled(z) z->active_zones.next
	198	#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
	199	#define ZONE_DEBUG_OFFSET ROUNDUP(sizeof(queue_chain_t),16)
91447636 A	200	#endif /* ZONE_DEBUG */
91447636 A	201
39037602 A	202	extern unsigned int num_zones;
	203	extern struct zone zone_array[];
	204
91447636 A	205	#endif /* MACH_KERNEL_PRIVATE */
	206
	207	__BEGIN_DECLS
	208
91447636	209
813fb2f6 A	210	/* Item definitions for zalloc/zinit/zone_change */
	211	#define Z_EXHAUST 1 /* Make zone exhaustible */
	212	#define Z_COLLECT 2 /* Make zone collectable */
	213	#define Z_EXPAND 3 /* Make zone expandable */
	214	#define Z_FOREIGN 4 /* Allow collectable zone to contain foreign elements */
	215	#define Z_CALLERACCT 5 /* Account alloc/free against the caller */
	216	#define Z_NOENCRYPT 6 /* Don't encrypt zone during hibernation */
	217	#define Z_NOCALLOUT 7 /* Don't asynchronously replenish the zone via callouts */
	218	#define Z_ALIGNMENT_REQUIRED 8
	219	#define Z_GZALLOC_EXEMPT 9 /* Not tracked in guard allocation mode */
fe8ab488 A	220
fe8ab488 A	221
1c79356b	222
813fb2f6	223	#ifdef XNU_KERNEL_PRIVATE
91447636	224
813fb2f6 A	225	extern vm_offset_t zone_map_min_address;
813fb2f6 A	226	extern vm_offset_t zone_map_max_address;
91447636 A	227
91447636 A	228
fe8ab488 A	229	/* Non-waiting for memory version of zalloc */
	230	extern void * zalloc_nopagewait(
	231	zone_t zone);
	232
91447636 A	233	/* Non-blocking version of zalloc */
	234	extern void * zalloc_noblock(
	235	zone_t zone);
	236
fe8ab488	237	/* selective version of zalloc */
91447636 A	238	extern void * zalloc_canblock(
	239	zone_t zone,
	240	boolean_t canblock);
	241
	242	/* Get from zone free list */
	243	extern void * zget(
	244	zone_t zone);
1c79356b A	245
	246	/* Fill zone with memory */
	247	extern void zcram(
91447636	248	zone_t zone,
7ddcb079	249	vm_offset_t newmem,
91447636	250	vm_size_t size);
1c79356b A	251
	252	/* Initially fill zone with specified number of elements */
	253	extern int zfill(
91447636 A	254	zone_t zone,
	255	int nelem);
	256
7ddcb079	257	extern void zone_prio_refill_configure(zone_t, vm_size_t);
813fb2f6 A	258
813fb2f6 A	259	/* See above/top of file. Z_* definitions moved so they would be usable by kexts */
39236c6e	260
91447636 A	261	/* Preallocate space for zone from zone map */
	262	extern void zprealloc(
	263	zone_t zone,
	264	vm_size_t size);
9bccf70c	265
91447636 A	266	extern integer_t zone_free_count(
91447636 A	267	zone_t zone);
9bccf70c	268
39037602 A	269	extern vm_size_t zone_element_size(
	270	void *addr,
	271	zone_t *z);
	272
6d2010ae A	273	/*
	274	* MAX_ZTRACE_DEPTH configures how deep of a stack trace is taken on each zalloc in the zone of interest. 15
	275	* levels is usually enough to get past all the layers of code in kalloc and IOKit and see who the actual
	276	* caller is up above these lower levels.
	277	*
	278	* This is used both for the zone leak detector and the zone corruption log.
	279	*/
	280
	281	#define MAX_ZTRACE_DEPTH 15
	282
	283	/*
	284	* Structure for keeping track of a backtrace, used for leak detection.
	285	* This is in the .h file because it is used during panic, see kern/debug.c
	286	* A non-zero size indicates that the trace is in use.
	287	*/
	288	struct ztrace {
	289	vm_size_t zt_size; /* How much memory are all the allocations referring to this trace taking up? */
	290	uint32_t zt_depth; /* depth of stack (0 to MAX_ZTRACE_DEPTH) */
	291	void* zt_stack[MAX_ZTRACE_DEPTH]; /* series of return addresses from OSBacktrace */
	292	uint32_t zt_collisions; /* How many times did a different stack land here while it was occupied? */
	293	uint32_t zt_hit_count; /* for determining effectiveness of hash function */
	294	};
	295
	296	#if CONFIG_ZLEAKS
	297
	298	/* support for the kern.zleak.* sysctls */
	299
	300	extern kern_return_t zleak_activate(void);
	301	extern vm_size_t zleak_max_zonemap_size;
	302	extern vm_size_t zleak_global_tracking_threshold;
	303	extern vm_size_t zleak_per_zone_tracking_threshold;
	304
	305	extern int get_zleak_state(void);
	306
	307	#endif /* CONFIG_ZLEAKS */
	308
	309	/* These functions used for leak detection both in zalloc.c and mbuf.c */
316670eb A	310	extern uintptr_t hash_mix(uintptr_t);
	311	extern uint32_t hashbacktrace(uintptr_t *, uint32_t, uint32_t);
	312	extern uint32_t hashaddr(uintptr_t, uint32_t);
	313
	314	#define lock_zone(zone) \
	315	MACRO_BEGIN \
	316	lck_mtx_lock_spin(&(zone)->lock); \
	317	MACRO_END
	318
	319	#define unlock_zone(zone) \
	320	MACRO_BEGIN \
	321	lck_mtx_unlock(&(zone)->lock); \
	322	MACRO_END
	323
	324	#if CONFIG_GZALLOC
	325	void gzalloc_init(vm_size_t);
	326	void gzalloc_zone_init(zone_t);
	327	void gzalloc_configure(void);
	328	void gzalloc_reconfigure(zone_t);
	329	boolean_t gzalloc_enabled(void);
	330
	331	vm_offset_t gzalloc_alloc(zone_t, boolean_t);
	332	boolean_t gzalloc_free(zone_t, void *);
39037602	333	boolean_t gzalloc_element_size(void , zone_t , vm_size_t *);
316670eb	334	#endif /* CONFIG_GZALLOC */
6d2010ae	335
39037602 A	336	/* Callbacks for btlog lock/unlock */
	337	void zlog_btlog_lock(__unused void *);
	338	void zlog_btlog_unlock(__unused void *);
	339
91447636	340	#endif /* XNU_KERNEL_PRIVATE */
9bccf70c	341
813fb2f6 A	342	/* Allocate from zone */
	343	extern void * zalloc(
	344	zone_t zone);
	345
	346	/* Free zone element */
	347	extern void zfree(
	348	zone_t zone,
	349	void *elem);
	350
	351	/* Create zone */
	352	extern zone_t zinit(
	353	vm_size_t size, /* the size of an element */
	354	vm_size_t maxmem, /* maximum memory to use */
	355	vm_size_t alloc, /* allocation size */
	356	const char name); / a name for the zone */
	357
	358	/* Change zone parameters */
	359	extern void zone_change(
	360	zone_t zone,
	361	unsigned int item,
	362	boolean_t value);
	363
	364
91447636	365	__END_DECLS
1c79356b A	366
1c79356b A	367	#endif /* _KERN_ZALLOC_H_ */
91447636 A	368
91447636 A	369	#endif /* KERNEL_PRIVATE */