xref: /freebsd/sys/compat/linux/linux_common.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
1 /*-
2  * Copyright (c) 2014 Vassilis Laganakos
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/exec.h>
33 #include <sys/imgact.h>
34 #include <sys/imgact_elf.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/sx.h>
39 
40 #include <compat/linux/linux.h>
41 #include <compat/linux/linux_emul.h>
42 #include <compat/linux/linux_ioctl.h>
43 #include <compat/linux/linux_mib.h>
44 #include <compat/linux/linux_util.h>
45 
46 MODULE_VERSION(linux_common, 1);
47 
48 SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
49 
50 TAILQ_HEAD(, linux_ioctl_handler_element) linux_ioctl_handlers =
51     TAILQ_HEAD_INITIALIZER(linux_ioctl_handlers);
52 struct sx linux_ioctl_sx;
53 SX_SYSINIT(linux_ioctl, &linux_ioctl_sx, "Linux ioctl handlers");
54 
55 static int
56 linux_common_modevent(module_t mod, int type, void *data)
57 {
58 	struct linux_device_handler **ldhp;
59 
60 	switch(type) {
61 	case MOD_LOAD:
62 #ifdef INVARIANTS
63 		linux_check_errtbl();
64 #endif
65 		linux_dev_shm_create();
66 		linux_osd_jail_register();
67 		SET_FOREACH(ldhp, linux_device_handler_set)
68 			linux_device_register_handler(*ldhp);
69 		LIST_INIT(&futex_list);
70 		mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
71 		break;
72 	case MOD_UNLOAD:
73 		linux_dev_shm_destroy();
74 		linux_osd_jail_deregister();
75 		SET_FOREACH(ldhp, linux_device_handler_set)
76 			linux_device_unregister_handler(*ldhp);
77 		mtx_destroy(&futex_mtx);
78 		break;
79 	default:
80 		return (EOPNOTSUPP);
81 	}
82 	return (0);
83 }
84 
85 static moduledata_t linux_common_mod = {
86 	"linuxcommon",
87 	linux_common_modevent,
88 	0
89 };
90 
91 DECLARE_MODULE(linuxcommon, linux_common_mod, SI_SUB_EXEC, SI_ORDER_ANY);
92 MODULE_VERSION(linuxcommon, 1);
93