1 /*	$NetBSD: k_uvm.c,v 1.1 2012/02/17 22:36:50 jmmv Exp $	*/
2 /*
3  * Copyright (c) 2012 The NetBSD Foundation, Inc.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
16  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
22  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
24  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: k_uvm.c,v 1.1 2012/02/17 22:36:50 jmmv Exp $");
31 
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/sysctl.h>
36 
37 MODULE(MODULE_CLASS_MISC, k_uvm, NULL);
38 
39 /* --------------------------------------------------------------------- */
40 /* Sysctl interface to query information about the module.               */
41 /* --------------------------------------------------------------------- */
42 
43 static struct sysctllog *clogp;
44 static int page_size;
45 
46 #define K_UVM 0x12345678
47 #define K_UVM_VALUE 0
48 
49 SYSCTL_SETUP(sysctl_k_uvm_setup, "sysctl k_uvm subtree setup")
50 {
51 
52 	sysctl_createv(clog, 0, NULL, NULL,
53 	               CTLFLAG_PERMANENT,
54 	               CTLTYPE_NODE, "k_uvm", NULL,
55 	               NULL, 0, NULL, 0,
56 	               CTL_VENDOR, K_UVM, CTL_EOL);
57 
58 	sysctl_createv(clog, 0, NULL, NULL,
59 	               CTLFLAG_PERMANENT,
60 	               CTLTYPE_INT, "page_size",
61 		       SYSCTL_DESCR("Value of PAGE_SIZE"),
62 		       NULL, 0, &page_size, 0,
63 	               CTL_VENDOR, K_UVM, K_UVM_VALUE, CTL_EOL);
64 }
65 
66 /* --------------------------------------------------------------------- */
67 /* Module management.                                                    */
68 /* --------------------------------------------------------------------- */
69 
70 static
71 int
72 k_uvm_init(prop_dictionary_t props)
73 {
74 
75 	page_size = PAGE_SIZE;
76 
77 	sysctl_k_uvm_setup(&clogp);
78 
79 	return 0;
80 }
81 
82 static
83 int
84 k_uvm_fini(void *arg)
85 {
86 
87 	sysctl_teardown(&clogp);
88 
89 	return 0;
90 }
91 
92 static
93 int
94 k_uvm_modcmd(modcmd_t cmd, void *arg)
95 {
96 	int ret;
97 
98 	switch (cmd) {
99 	case MODULE_CMD_INIT:
100 		ret = k_uvm_init(arg);
101 		break;
102 
103 	case MODULE_CMD_FINI:
104 		ret = k_uvm_fini(arg);
105 		break;
106 
107 	case MODULE_CMD_STAT:
108 	default:
109 		ret = ENOTTY;
110 	}
111 
112 	return ret;
113 }
114