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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
1da177e4 LT |
6 | #include "linux/posix_types.h" |
7 | #include "linux/tty.h" | |
8 | #include "linux/tty_flip.h" | |
9 | #include "linux/types.h" | |
10 | #include "linux/major.h" | |
11 | #include "linux/kdev_t.h" | |
12 | #include "linux/console.h" | |
13 | #include "linux/string.h" | |
14 | #include "linux/sched.h" | |
15 | #include "linux/list.h" | |
16 | #include "linux/init.h" | |
17 | #include "linux/interrupt.h" | |
18 | #include "linux/slab.h" | |
19 | #include "linux/hardirq.h" | |
20 | #include "asm/current.h" | |
21 | #include "asm/irq.h" | |
22 | #include "stdio_console.h" | |
23 | #include "line.h" | |
24 | #include "chan_kern.h" | |
25 | #include "user_util.h" | |
26 | #include "kern_util.h" | |
27 | #include "irq_user.h" | |
28 | #include "mconsole_kern.h" | |
29 | #include "init.h" | |
1da177e4 LT |
30 | |
31 | #define MAX_TTYS (16) | |
32 | ||
1da177e4 LT |
33 | /* Referenced only by tty_driver below - presumably it's locked correctly |
34 | * by the tty driver. | |
35 | */ | |
36 | ||
37 | static struct tty_driver *console_driver; | |
38 | ||
39 | void stdio_announce(char *dev_name, int dev) | |
40 | { | |
41 | printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, | |
42 | dev_name); | |
43 | } | |
44 | ||
a52f362f | 45 | /* Almost const, except that xterm_title may be changed in an initcall */ |
1da177e4 LT |
46 | static struct chan_opts opts = { |
47 | .announce = stdio_announce, | |
48 | .xterm_title = "Virtual Console #%d", | |
49 | .raw = 1, | |
50 | .tramp_stack = 0, | |
51 | .in_kernel = 1, | |
52 | }; | |
53 | ||
f28169d2 | 54 | static int con_config(char *str, char **error_out); |
1da177e4 | 55 | static int con_get_config(char *dev, char *str, int size, char **error_out); |
f28169d2 | 56 | static int con_remove(int n, char **con_remove); |
1da177e4 | 57 | |
d5c9ffc6 JD |
58 | |
59 | /* Const, except for .mc.list */ | |
1da177e4 LT |
60 | static struct line_driver driver = { |
61 | .name = "UML console", | |
62 | .device_name = "tty", | |
1da177e4 LT |
63 | .major = TTY_MAJOR, |
64 | .minor_start = 0, | |
65 | .type = TTY_DRIVER_TYPE_CONSOLE, | |
66 | .subtype = SYSTEM_TYPE_CONSOLE, | |
67 | .read_irq = CONSOLE_IRQ, | |
68 | .read_irq_name = "console", | |
69 | .write_irq = CONSOLE_WRITE_IRQ, | |
70 | .write_irq_name = "console-write", | |
1da177e4 LT |
71 | .mc = { |
72 | .name = "con", | |
73 | .config = con_config, | |
74 | .get_config = con_get_config, | |
d50084a2 | 75 | .id = line_id, |
1da177e4 LT |
76 | .remove = con_remove, |
77 | }, | |
78 | }; | |
79 | ||
d5c9ffc6 JD |
80 | /* The array is initialized by line_init, at initcall time. The |
81 | * elements are locked individually as needed. | |
1da177e4 | 82 | */ |
d79a5809 JD |
83 | static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), |
84 | [ 1 ... MAX_TTYS - 1 ] = | |
85 | LINE_INIT(CONFIG_CON_CHAN, &driver) }; | |
1da177e4 | 86 | |
f28169d2 | 87 | static int con_config(char *str, char **error_out) |
1da177e4 | 88 | { |
f28169d2 | 89 | return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); |
1da177e4 LT |
90 | } |
91 | ||
92 | static int con_get_config(char *dev, char *str, int size, char **error_out) | |
93 | { | |
0834cc77 | 94 | return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); |
1da177e4 LT |
95 | } |
96 | ||
f28169d2 | 97 | static int con_remove(int n, char **error_out) |
1da177e4 | 98 | { |
f28169d2 | 99 | return line_remove(vts, ARRAY_SIZE(vts), n, error_out); |
1da177e4 LT |
100 | } |
101 | ||
102 | static int con_open(struct tty_struct *tty, struct file *filp) | |
103 | { | |
1f80171e | 104 | return line_open(vts, tty); |
1da177e4 LT |
105 | } |
106 | ||
730760e9 | 107 | /* Set in an initcall, checked in an exitcall */ |
1da177e4 LT |
108 | static int con_init_done = 0; |
109 | ||
5e7672ec | 110 | static const struct tty_operations console_ops = { |
1da177e4 LT |
111 | .open = con_open, |
112 | .close = line_close, | |
113 | .write = line_write, | |
b97b77cc | 114 | .put_char = line_put_char, |
d50084a2 | 115 | .write_room = line_write_room, |
1da177e4 | 116 | .chars_in_buffer = line_chars_in_buffer, |
b97b77cc PBG |
117 | .flush_buffer = line_flush_buffer, |
118 | .flush_chars = line_flush_chars, | |
1da177e4 LT |
119 | .set_termios = line_set_termios, |
120 | .ioctl = line_ioctl, | |
e4dcee80 JD |
121 | .throttle = line_throttle, |
122 | .unthrottle = line_unthrottle, | |
1da177e4 LT |
123 | }; |
124 | ||
125 | static void uml_console_write(struct console *console, const char *string, | |
d50084a2 | 126 | unsigned len) |
1da177e4 LT |
127 | { |
128 | struct line *line = &vts[console->index]; | |
b97b77cc | 129 | unsigned long flags; |
1da177e4 | 130 | |
b97b77cc | 131 | spin_lock_irqsave(&line->lock, flags); |
1da177e4 | 132 | console_write_chan(&line->chan_list, string, len); |
b97b77cc | 133 | spin_unlock_irqrestore(&line->lock, flags); |
1da177e4 LT |
134 | } |
135 | ||
136 | static struct tty_driver *uml_console_device(struct console *c, int *index) | |
137 | { | |
138 | *index = c->index; | |
139 | return console_driver; | |
140 | } | |
141 | ||
142 | static int uml_console_setup(struct console *co, char *options) | |
143 | { | |
144 | struct line *line = &vts[co->index]; | |
145 | ||
a52f362f | 146 | return console_open_chan(line, co); |
1da177e4 LT |
147 | } |
148 | ||
d5c9ffc6 | 149 | /* No locking for register_console call - relies on single-threaded initcalls */ |
1da177e4 LT |
150 | static struct console stdiocons = { |
151 | .name = "tty", | |
152 | .write = uml_console_write, | |
153 | .device = uml_console_device, | |
154 | .setup = uml_console_setup, | |
155 | .flags = CON_PRINTBUFFER, | |
156 | .index = -1, | |
1da177e4 LT |
157 | }; |
158 | ||
159 | int stdio_init(void) | |
160 | { | |
161 | char *new_title; | |
162 | ||
d5c9ffc6 JD |
163 | console_driver = register_lines(&driver, &console_ops, vts, |
164 | ARRAY_SIZE(vts)); | |
d50084a2 | 165 | if (console_driver == NULL) |
1da177e4 LT |
166 | return -1; |
167 | printk(KERN_INFO "Initialized stdio console driver\n"); | |
168 | ||
1f80171e | 169 | lines_init(vts, ARRAY_SIZE(vts), &opts); |
1da177e4 LT |
170 | |
171 | new_title = add_xterm_umid(opts.xterm_title); | |
172 | if(new_title != NULL) | |
173 | opts.xterm_title = new_title; | |
174 | ||
175 | con_init_done = 1; | |
176 | register_console(&stdiocons); | |
d50084a2 | 177 | return 0; |
1da177e4 LT |
178 | } |
179 | late_initcall(stdio_init); | |
180 | ||
181 | static void console_exit(void) | |
182 | { | |
183 | if (!con_init_done) | |
184 | return; | |
0834cc77 | 185 | close_lines(vts, ARRAY_SIZE(vts)); |
1da177e4 LT |
186 | } |
187 | __uml_exitcall(console_exit); | |
188 | ||
189 | static int console_chan_setup(char *str) | |
190 | { | |
f28169d2 JD |
191 | char *error; |
192 | int ret; | |
193 | ||
194 | ret = line_setup(vts, ARRAY_SIZE(vts), str, &error); | |
195 | if(ret < 0) | |
196 | printk(KERN_ERR "Failed to set up console with " | |
197 | "configuration string \"%s\" : %s\n", str, error); | |
198 | ||
199 | return 1; | |
1da177e4 LT |
200 | } |
201 | __setup("con", console_chan_setup); | |
202 | __channel_help(console_chan_setup, "con"); |