1/*
2 * Copyright (c) 2000-2010 Apple 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 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
30 * support for mandatory and extensible security protections. This notice
31 * is included in support of clause 2.2 (b) of the Apple Public License,
32 * Version 2.0.
33 */
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/lock.h>
38#include <sys/proc_internal.h>
39#include <sys/kauth.h>
40#include <sys/buf.h>
41#include <sys/uio.h>
42#include <sys/vnode_internal.h>
43#include <sys/namei.h>
44#include <sys/ubc_internal.h>
45#include <sys/malloc.h>
46#include <sys/user.h>
47
48#include <default_pager/default_pager_types.h>
49
50#include <security/audit/audit.h>
51#include <bsm/audit_kevents.h>
52
53#include <mach/mach_types.h>
54#include <mach/host_priv.h>
55#include <mach/mach_traps.h>
56#include <mach/boolean.h>
57
58#include <kern/kern_types.h>
59#include <kern/locks.h>
60#include <kern/host.h>
61#include <kern/task.h>
62#include <kern/zalloc.h>
63#include <kern/kalloc.h>
64#include <kern/policy_internal.h>
65
66#include <libkern/libkern.h>
67
68#include <vm/vm_pageout.h>
69#include <vm/vm_map.h>
70#include <vm/vm_kern.h>
71#include <vm/vnode_pager.h>
72#include <vm/vm_protos.h>
73#if CONFIG_MACF
74#include <security/mac_framework.h>
75#endif
76
77#include <pexpert/pexpert.h>
78
79
80/*
81 * Routine: macx_backing_store_recovery
82 * Function:
83 * Syscall interface to set a tasks privilege
84 * level so that it is not subject to
85 * macx_backing_store_suspend
86 */
87int
88macx_backing_store_recovery(
89 __unused struct macx_backing_store_recovery_args *args)
90{
91 return ENOTSUP;
92}
93
94/*
95 * Routine: macx_backing_store_suspend
96 * Function:
97 * Syscall interface to stop new demand for
98 * backing store when backing store is low
99 */
100
101int
102macx_backing_store_suspend(
103 __unused struct macx_backing_store_suspend_args *args)
104{
105 return ENOTSUP;
106}
107
108
109extern boolean_t compressor_store_stop_compaction;
110
111/*
112 * Routine: macx_backing_store_compaction
113 * Function:
114 * Turn compaction of swap space on or off. This is
115 * used during shutdown/restart so that the kernel
116 * doesn't waste time compacting swap files that are
117 * about to be deleted anyway. Compaction is always
118 * on by default when the system comes up and is turned
119 * off when a shutdown/restart is requested. It is
120 * re-enabled if the shutdown/restart is aborted for any reason.
121 *
122 * This routine assumes macx_lock has been locked by macx_triggers ->
123 * mach_macx_triggers -> macx_backing_store_compaction
124 */
125
126int
127macx_backing_store_compaction(int flags)
128{
129 int error;
130
131 if ((error = suser(kauth_cred_get(), 0)))
132 return error;
133
134 if (flags & SWAP_COMPACT_DISABLE) {
135 compressor_store_stop_compaction = TRUE;
136
137 kprintf("compressor_store_stop_compaction = TRUE\n");
138
139 } else if (flags & SWAP_COMPACT_ENABLE) {
140 compressor_store_stop_compaction = FALSE;
141
142 kprintf("compressor_store_stop_compaction = FALSE\n");
143 }
144
145 return 0;
146}
147
148/*
149 * Routine: macx_triggers
150 * Function:
151 * Syscall interface to set the call backs for low and
152 * high water marks.
153 */
154int
155macx_triggers(
156 struct macx_triggers_args *args)
157{
158 int flags = args->flags;
159
160 if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE))
161 return (macx_backing_store_compaction(flags));
162
163 return ENOTSUP;
164}
165
166
167int
168macx_swapon(
169 __unused struct macx_swapon_args *args)
170{
171 return ENOTSUP;
172}
173
174
175/*
176 * Routine: macx_swapoff
177 * Function:
178 * Syscall interface to remove a file from backing store
179 */
180int
181macx_swapoff(
182 __unused struct macx_swapoff_args *args)
183{
184 return ENOTSUP;
185}
186
187/*
188 * Routine: macx_swapinfo
189 * Function:
190 * Syscall interface to get general swap statistics
191 */
192extern uint64_t vm_swap_get_total_space(void);
193extern uint64_t vm_swap_get_free_space(void);
194extern boolean_t vm_swap_up;
195
196int
197macx_swapinfo(
198 memory_object_size_t *total_p,
199 memory_object_size_t *avail_p,
200 vm_size_t *pagesize_p,
201 boolean_t *encrypted_p)
202{
203 if (VM_CONFIG_SWAP_IS_PRESENT) {
204
205 *total_p = vm_swap_get_total_space();
206 *avail_p = vm_swap_get_free_space();
207 *pagesize_p = (vm_size_t)PAGE_SIZE_64;
208 *encrypted_p = TRUE;
209
210 } else {
211
212 *total_p = 0;
213 *avail_p = 0;
214 *pagesize_p = 0;
215 *encrypted_p = FALSE;
216 }
217 return 0;
218}
219