1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
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.
14 *
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
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 */
31/*
32 * HISTORY
33 *
34 * Revision 1.1.1.1  1998/09/22 21:05:32  wsanchez
35 * Import of Mac OS X kernel (~semeria)
36 *
37 * Revision 1.1.1.1  1998/03/07 02:25:56  wsanchez
38 * Import of OSF Mach kernel (~mburg)
39 *
40 * Revision 1.1.4.1  1995/04/07  19:02:38  barbou
41 * 	Merged into mainline.
42 * 	[95/03/09            barbou]
43 *
44 * Revision 1.1.2.2  1995/02/13  15:35:45  barbou
45 * 	Merged/ported to MK6.
46 *
47 * Revision 1.1.1.3  94/08/12  15:44:39  barbou
48 * 	VM Merge - Task Swapper.
49 *
50 * 	Changed host_priv_t into host_t.
51 * 	[94/07/28            barbou]
52 *
53 * Revision 1.1.1.2  1994/07/28  15:33:46  barbou
54 * 	Copied from IK.
55 *
56 * Revision 3.0.3.2  1994/01/20  19:53:01  chasb
57 * 	Remove excessively restrictive copyright notice
58 * 	[1994/01/20  17:50:40  chasb]
59 *
60 * Revision 3.0.3.1  1993/12/20  21:06:49  gupta
61 * 	Expanded C O P Y R I G H T
62 * 	[1993/12/17  22:19:22  gupta]
63 *
64 * Revision 3.0  1992/12/31  22:08:24  ede
65 * 	Initial revision for OSF/1 R1.3
66 *
67 * Revision 1.1.4.5  1992/03/16  18:02:52  gmf
68 * 	Add TASK_SW_ELIGIBLE flag to swap_flags; prototype
69 * 	task_swapout_eligible, task_swapout_ineligible.
70 * 	[1992/02/12  22:01:48  gmf]
71 *
72 * Revision 1.1.4.4  1992/01/22  22:14:13  gmf
73 * 	Change prototype for task_swappable() to use host_priv_t
74 * 	instead of host_t.
75 * 	[1992/01/17  17:48:13  gmf]
76 *
77 * Revision 1.1.4.3  1991/12/10  17:20:55  gmf
78 * 	Add extern declaration for new thread.
79 * 	Changed TASK_SW_WAIT flag to TASK_SW_WANT_IN.
80 * 	[1991/12/10  16:19:10  gmf]
81 *
82 * Revision 1.1.4.2  1991/11/21  21:48:35  mmp
83 * 	initial task swapping code
84 * 	[1991/11/21  21:01:37  mmp]
85 *
86 * $EndLog$
87 */
88
89/*
90 *	        File:	kern/task_swap.h
91 *
92 *	Task residency management primitives declarations.
93 */
94
95#ifndef	_KERN_TASK_SWAP_H_
96#define	_KERN_TASK_SWAP_H_
97
98#include <kern/host.h>
99
100/*
101 *	swap states
102 */
103#define TASK_SW_UNSWAPPABLE	1	/* not swappable */
104#define TASK_SW_IN		2	/* swapped in (resident) */
105#define TASK_SW_OUT		3	/* swapped out (non-resident) */
106#define TASK_SW_COMING_IN	4	/* about to be swapped in */
107#define TASK_SW_GOING_OUT	5	/* being swapped out */
108
109/*
110 *	swap flags
111 */
112#define TASK_SW_MAKE_UNSWAPPABLE	0x01	/* make it unswappable */
113#define TASK_SW_WANT_IN			0x02	/* sleeping on state */
114#define TASK_SW_ELIGIBLE		0x04	/* eligible for swapping */
115
116/*
117 * exported routines
118 */
119extern void task_swapper_init(void);
120extern kern_return_t task_swapin(
121				task_t,		/* task */
122				boolean_t);	/* make_unswappable */
123extern kern_return_t task_swapout(task_t /* task */);
124extern void task_swapper(void);
125extern void task_swap_swapout_thread(void);
126extern void compute_vm_averages(void);
127extern kern_return_t task_swappable(
128				host_priv_t,	/* host */
129				task_t,		/* task */
130				boolean_t); 	/* swappable */
131extern void task_swapout_eligible(task_t /* task */);
132extern void task_swapout_ineligible(task_t /* task */);
133extern void swapout_ast(void);
134
135#endif	/* _KERN_TASK_SWAP_H_ */
136