[apple/xnu.git] / osfmk / vm / vm_external.h

/*
 * Copyright (c) 2000 Apple Computer, 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 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.
 */
/*
 */

#ifndef	VM_VM_EXTERNAL_H_
#define VM_VM_EXTERNAL_H_

#include <mach/boolean.h>
#include <mach/machine/vm_types.h>

/*
 *	External page management hint technology
 *
 *	The data structure exported by this module maintains
 *	a (potentially incomplete) map of the pages written
 *	to external storage for a range of virtual memory.
 */

typedef char	*vm_external_map_t;
#define	VM_EXTERNAL_NULL	((char *) 0)

/*
 *	The states that may be recorded for a page of external storage.
 */

typedef int	vm_external_state_t;
#define	VM_EXTERNAL_STATE_EXISTS		1
#define	VM_EXTERNAL_STATE_UNKNOWN		2
#define	VM_EXTERNAL_STATE_ABSENT		3

/*
 * Useful macros
 */
#define stob(s)	((atop_32((s)) + 07) >> 3)

/*
 *	Routines exported by this module.
 */
					/* Initialize the module */
extern void			vm_external_module_initialize(void);


extern vm_external_map_t	vm_external_create(
					/* Create a vm_external_map_t */
					vm_offset_t		size);

extern void			vm_external_destroy(
					/* Destroy one */
					vm_external_map_t	map,
					vm_size_t		size);

extern vm_size_t		vm_external_map_size(
					/* Return size of map in bytes */
					vm_offset_t	size);

extern void			vm_external_copy(
					/* Copy one into another */
					vm_external_map_t	old_map,
					vm_size_t		old_size,
					vm_external_map_t	new_map);

extern void			vm_external_state_set(	
					/* Set state of a page to
					 * VM_EXTERNAL_STATE_EXISTS */
					vm_external_map_t	map,
					vm_offset_t		offset);

extern void			vm_external_state_clr(	
					/* clear page state
					 */
					vm_external_map_t	map,
					vm_offset_t		offset);

#define	vm_external_state_get(map, offset)			  	\
			(((map) != VM_EXTERNAL_NULL) ? 			\
			  _vm_external_state_get((map), (offset)) :	\
			  VM_EXTERNAL_STATE_UNKNOWN)
					/* Retrieve the state for a
					 * given page, if known.  */

extern vm_external_state_t	_vm_external_state_get(
					/* HIDDEN routine */
					vm_external_map_t	map,
					vm_offset_t		offset);

boolean_t			vm_external_within(
					/* Check if new object size
					 * fits in current map */
					vm_size_t	new_size, 
					vm_size_t	old_size);
#endif	/* VM_VM_EXTERNAL_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	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 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	#ifndef VM_VM_EXTERNAL_H_
	60	#define VM_VM_EXTERNAL_H_
	61
	62	#include <mach/boolean.h>
	63	#include <mach/machine/vm_types.h>
	64
	65	/*
	66	* External page management hint technology
	67	*
	68	* The data structure exported by this module maintains
	69	* a (potentially incomplete) map of the pages written
	70	* to external storage for a range of virtual memory.
	71	*/
	72
	73	typedef char *vm_external_map_t;
	74	#define VM_EXTERNAL_NULL ((char *) 0)
	75
	76	/*
	77	* The states that may be recorded for a page of external storage.
	78	*/
	79
	80	typedef int vm_external_state_t;
	81	#define VM_EXTERNAL_STATE_EXISTS 1
	82	#define VM_EXTERNAL_STATE_UNKNOWN 2
	83	#define VM_EXTERNAL_STATE_ABSENT 3
	84
	85	/*
	86	* Useful macros
	87	*/
55e303ae	88	#define stob(s) ((atop_32((s)) + 07) >> 3)
1c79356b A	89
	90	/*
	91	* Routines exported by this module.
	92	*/
	93	/* Initialize the module */
	94	extern void vm_external_module_initialize(void);
	95
	96
	97	extern vm_external_map_t vm_external_create(
	98	/* Create a vm_external_map_t */
	99	vm_offset_t size);
	100
	101	extern void vm_external_destroy(
	102	/* Destroy one */
	103	vm_external_map_t map,
	104	vm_size_t size);
	105
	106	extern vm_size_t vm_external_map_size(
	107	/* Return size of map in bytes */
	108	vm_offset_t size);
	109
	110	extern void vm_external_copy(
	111	/* Copy one into another */
	112	vm_external_map_t old_map,
	113	vm_size_t old_size,
	114	vm_external_map_t new_map);
	115
	116	extern void vm_external_state_set(
	117	/* Set state of a page to
	118	* VM_EXTERNAL_STATE_EXISTS */
	119	vm_external_map_t map,
	120	vm_offset_t offset);
	121
	122	extern void vm_external_state_clr(
	123	/* clear page state
	124	*/
	125	vm_external_map_t map,
	126	vm_offset_t offset);
	127
	128	#define vm_external_state_get(map, offset) \
	129	(((map) != VM_EXTERNAL_NULL) ? \
	130	_vm_external_state_get((map), (offset)) : \
	131	VM_EXTERNAL_STATE_UNKNOWN)
	132	/* Retrieve the state for a
	133	* given page, if known. */
	134
	135	extern vm_external_state_t _vm_external_state_get(
	136	/* HIDDEN routine */
	137	vm_external_map_t map,
	138	vm_offset_t offset);
	139
	140	boolean_t vm_external_within(
	141	/* Check if new object size
	142	* fits in current map */
	143	vm_size_t new_size,
	144	vm_size_t old_size);
	145	#endif /* VM_VM_EXTERNAL_H_ */