Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee13...
[linux-2.6] / arch / um / drivers / stdio_console.c
1 /* 
2  * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
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"
30
31 #define MAX_TTYS (16)
32
33 /* ----------------------------------------------------------------------------- */
34
35 /* Referenced only by tty_driver below - presumably it's locked correctly
36  * by the tty driver.
37  */
38
39 static struct tty_driver *console_driver;
40
41 void stdio_announce(char *dev_name, int dev)
42 {
43         printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
44                dev_name);
45 }
46
47 static struct chan_opts opts = {
48         .announce       = stdio_announce,
49         .xterm_title    = "Virtual Console #%d",
50         .raw            = 1,
51         .tramp_stack    = 0,
52         .in_kernel      = 1,
53 };
54
55 static int con_config(char *str);
56 static int con_get_config(char *dev, char *str, int size, char **error_out);
57 static int con_remove(int n);
58
59 static struct line_driver driver = {
60         .name                   = "UML console",
61         .device_name            = "tty",
62         .major                  = TTY_MAJOR,
63         .minor_start            = 0,
64         .type                   = TTY_DRIVER_TYPE_CONSOLE,
65         .subtype                = SYSTEM_TYPE_CONSOLE,
66         .read_irq               = CONSOLE_IRQ,
67         .read_irq_name          = "console",
68         .write_irq              = CONSOLE_WRITE_IRQ,
69         .write_irq_name         = "console-write",
70         .symlink_from           = "ttys",
71         .symlink_to             = "vc",
72         .mc  = {
73                 .name           = "con",
74                 .config         = con_config,
75                 .get_config     = con_get_config,
76                 .id             = line_id,
77                 .remove         = con_remove,
78         },
79 };
80
81 static struct lines console_lines = LINES_INIT(MAX_TTYS);
82
83 /* The array is initialized by line_init, which is an initcall.  The 
84  * individual elements are protected by individual semaphores.
85  */
86 struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
87                               [ 1 ... MAX_TTYS - 1 ] =
88                               LINE_INIT(CONFIG_CON_CHAN, &driver) };
89
90 static int con_config(char *str)
91 {
92         return line_config(vts, ARRAY_SIZE(vts), str, &opts);
93 }
94
95 static int con_get_config(char *dev, char *str, int size, char **error_out)
96 {
97         return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
98 }
99
100 static int con_remove(int n)
101 {
102         return line_remove(vts, ARRAY_SIZE(vts), n);
103 }
104
105 static int con_open(struct tty_struct *tty, struct file *filp)
106 {
107         return line_open(vts, tty);
108 }
109
110 /* Set in an initcall, checked in an exitcall */
111 static int con_init_done = 0;
112
113 static const struct tty_operations console_ops = {
114         .open                   = con_open,
115         .close                  = line_close,
116         .write                  = line_write,
117         .put_char               = line_put_char,
118         .write_room             = line_write_room,
119         .chars_in_buffer        = line_chars_in_buffer,
120         .flush_buffer           = line_flush_buffer,
121         .flush_chars            = line_flush_chars,
122         .set_termios            = line_set_termios,
123         .ioctl                  = line_ioctl,
124         .throttle               = line_throttle,
125         .unthrottle             = line_unthrottle,
126 };
127
128 static void uml_console_write(struct console *console, const char *string,
129                               unsigned len)
130 {
131         struct line *line = &vts[console->index];
132         unsigned long flags;
133
134         spin_lock_irqsave(&line->lock, flags);
135         console_write_chan(&line->chan_list, string, len);
136         spin_unlock_irqrestore(&line->lock, flags);
137 }
138
139 static struct tty_driver *uml_console_device(struct console *c, int *index)
140 {
141         *index = c->index;
142         return console_driver;
143 }
144
145 static int uml_console_setup(struct console *co, char *options)
146 {
147         struct line *line = &vts[co->index];
148
149         return console_open_chan(line, co, &opts);
150 }
151
152 static struct console stdiocons = {
153         .name           = "tty",
154         .write          = uml_console_write,
155         .device         = uml_console_device,
156         .setup          = uml_console_setup,
157         .flags          = CON_PRINTBUFFER,
158         .index          = -1,
159         .data           = &vts,
160 };
161
162 int stdio_init(void)
163 {
164         char *new_title;
165
166         console_driver = line_register_devfs(&console_lines, &driver,
167                                              &console_ops, vts,
168                                              ARRAY_SIZE(vts));
169         if (console_driver == NULL)
170                 return -1;
171         printk(KERN_INFO "Initialized stdio console driver\n");
172
173         lines_init(vts, ARRAY_SIZE(vts), &opts);
174
175         new_title = add_xterm_umid(opts.xterm_title);
176         if(new_title != NULL)
177                 opts.xterm_title = new_title;
178
179         con_init_done = 1;
180         register_console(&stdiocons);
181         return 0;
182 }
183 late_initcall(stdio_init);
184
185 static void console_exit(void)
186 {
187         if (!con_init_done)
188                 return;
189         close_lines(vts, ARRAY_SIZE(vts));
190 }
191 __uml_exitcall(console_exit);
192
193 static int console_chan_setup(char *str)
194 {
195         return line_setup(vts, ARRAY_SIZE(vts), str);
196 }
197 __setup("con", console_chan_setup);
198 __channel_help(console_chan_setup, "con");