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1c79356b | 1 | /* |
2d21ac55 | 2 | * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. |
5d5c5d0d | 3 | * |
2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
0a7de745 | 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. | |
0a7de745 | 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. | |
0a7de745 | 17 | * |
2d21ac55 A |
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, |
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. | |
0a7de745 | 25 | * |
2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
1c79356b | 27 | */ |
1c79356b A |
28 | |
29 | /* | |
b0d623f7 A |
30 | * Indirect driver for console |
31 | * | |
32 | * The purpose of this driver is to provide a device node indirection for | |
33 | * the console device, which can be any tty class device. It does this by | |
34 | * externalizing a global pointer "constty", which is then pointed at the | |
35 | * console tty device. | |
36 | * | |
37 | * The default for this pointer is uninitialized; when it is NULL, we fall | |
38 | * back to the "km" device, which is a tty BSD wrapper device for the | |
39 | * Platform Expert console device. When it is non-NULL, we call through | |
40 | * to the tty device device instead. | |
41 | * | |
42 | * The registration for this device node is static, and the devfs init | |
43 | * code does not externalize a named device for it, to avoid software | |
44 | * seeing the device and trying to open it. | |
45 | * | |
46 | * The upshot of this is that the console driver should not be set as your | |
47 | * controlling tty, since you will get a reference to a device which does | |
48 | * not have an actual device node in /dev, so its name cannot be looked up. | |
1c79356b A |
49 | */ |
50 | #include <sys/param.h> | |
51 | #include <sys/systm.h> | |
52 | #include <sys/conf.h> | |
53 | #include <sys/ioctl.h> | |
54 | #include <sys/tty.h> | |
55 | #include <sys/proc.h> | |
56 | #include <sys/uio.h> | |
57 | ||
0a7de745 | 58 | struct tty *constty; /* current console device */ |
1c79356b | 59 | |
b0d623f7 A |
60 | /* |
61 | * The km driver supplied the default console device for the systems | |
62 | * (usually a raw frame buffer driver, but potentially a serial driver). | |
63 | */ | |
64 | extern struct tty *km_tty[1]; | |
65 | ||
66 | /* | |
67 | * cdevsw[] entries for the console device driver | |
68 | */ | |
69 | int cnopen(__unused dev_t dev, int flag, int devtype, proc_t pp); | |
70 | int cnclose(__unused dev_t dev, int flag, int mode, proc_t pp); | |
91447636 A |
71 | int cnread(__unused dev_t dev, struct uio *uio, int ioflag); |
72 | int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag); | |
b0d623f7 A |
73 | int cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flg, proc_t p); |
74 | int cnselect(__unused dev_t dev, int flag, void * wql, proc_t p); | |
91447636 | 75 | |
b0d623f7 A |
76 | static dev_t |
77 | cndev(void) | |
1c79356b | 78 | { |
0a7de745 | 79 | if (constty) { |
b0d623f7 | 80 | return constty->t_dev; |
0a7de745 | 81 | } else { |
b0d623f7 | 82 | return km_tty[0]->t_dev; |
0a7de745 | 83 | } |
1c79356b A |
84 | } |
85 | ||
1c79356b | 86 | int |
b0d623f7 | 87 | cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) |
1c79356b | 88 | { |
b0d623f7 | 89 | dev = cndev(); |
0a7de745 | 90 | return (*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp); |
b0d623f7 | 91 | } |
91447636 A |
92 | |
93 | ||
b0d623f7 A |
94 | int |
95 | cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) | |
96 | { | |
97 | dev = cndev(); | |
0a7de745 | 98 | return (*cdevsw[major(dev)].d_close)(dev, flag, mode, pp); |
1c79356b A |
99 | } |
100 | ||
b0d623f7 | 101 | |
1c79356b | 102 | int |
91447636 | 103 | cnread(__unused dev_t dev, struct uio *uio, int ioflag) |
1c79356b | 104 | { |
b0d623f7 | 105 | dev = cndev(); |
0a7de745 | 106 | return (*cdevsw[major(dev)].d_read)(dev, uio, ioflag); |
1c79356b A |
107 | } |
108 | ||
b0d623f7 | 109 | |
1c79356b | 110 | int |
91447636 | 111 | cnwrite(__unused dev_t dev, struct uio *uio, int ioflag) |
1c79356b | 112 | { |
b0d623f7 | 113 | dev = cndev(); |
0a7de745 | 114 | return (*cdevsw[major(dev)].d_write)(dev, uio, ioflag); |
1c79356b A |
115 | } |
116 | ||
b0d623f7 | 117 | |
1c79356b | 118 | int |
b0d623f7 | 119 | cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) |
1c79356b | 120 | { |
b0d623f7 A |
121 | dev = cndev(); |
122 | #if 0 | |
1c79356b A |
123 | /* |
124 | * Superuser can always use this to wrest control of console | |
125 | * output from the "virtual" console. | |
b0d623f7 A |
126 | * |
127 | * XXX Unfortunately, this code doesn't do what the author thougt | |
128 | * XXX it did; use of the console device, a TIOCCONS would always | |
129 | * XXX disassociate the console from a virtual terminal and send | |
130 | * XXX it back to the fake tty. | |
1c79356b | 131 | */ |
91447636 | 132 | if ((unsigned) cmd == TIOCCONS && constty) { |
b0d623f7 A |
133 | int error = proc_suser(p); |
134 | if (!error) { | |
135 | constty = NULL; | |
91447636 | 136 | } |
0a7de745 | 137 | return error; |
1c79356b | 138 | } |
0a7de745 | 139 | #endif /* 0 */ |
91447636 | 140 | |
0a7de745 | 141 | return (*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p); |
1c79356b A |
142 | } |
143 | ||
1c79356b | 144 | |
1c79356b | 145 | int |
b0d623f7 | 146 | cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p) |
1c79356b | 147 | { |
b0d623f7 | 148 | dev = cndev(); |
0a7de745 | 149 | return (*cdevsw[major(dev)].d_select)(dev, flag, wql, p); |
1c79356b | 150 | } |