Merge master.kernel.org:/pub/scm/linux/kernel/git/herbert/crypto-2.6
[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 "kern_util.h"
26 #include "irq_user.h"
27 #include "mconsole_kern.h"
28 #include "init.h"
29
30 #define MAX_TTYS (16)
31
32 /* Referenced only by tty_driver below - presumably it's locked correctly
33  * by the tty driver.
34  */
35
36 static struct tty_driver *console_driver;
37
38 void stdio_announce(char *dev_name, int dev)
39 {
40         printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
41                dev_name);
42 }
43
44 /* Almost const, except that xterm_title may be changed in an initcall */
45 static struct chan_opts opts = {
46         .announce       = stdio_announce,
47         .xterm_title    = "Virtual Console #%d",
48         .raw            = 1,
49         .tramp_stack    = 0,
50         .in_kernel      = 1,
51 };
52
53 static int con_config(char *str, char **error_out);
54 static int con_get_config(char *dev, char *str, int size, char **error_out);
55 static int con_remove(int n, char **con_remove);
56
57
58 /* Const, except for .mc.list */
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         .mc  = {
71                 .list           = LIST_HEAD_INIT(driver.mc.list),
72                 .name           = "con",
73                 .config         = con_config,
74                 .get_config     = con_get_config,
75                 .id             = line_id,
76                 .remove         = con_remove,
77         },
78 };
79
80 /* The array is initialized by line_init, at initcall time.  The
81  * elements are locked individually as needed.
82  */
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) };
86
87 static int con_config(char *str, char **error_out)
88 {
89         return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
90 }
91
92 static int con_get_config(char *dev, char *str, int size, char **error_out)
93 {
94         return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
95 }
96
97 static int con_remove(int n, char **error_out)
98 {
99         return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
100 }
101
102 static int con_open(struct tty_struct *tty, struct file *filp)
103 {
104         return line_open(vts, tty);
105 }
106
107 /* Set in an initcall, checked in an exitcall */
108 static int con_init_done = 0;
109
110 static const struct tty_operations console_ops = {
111         .open                   = con_open,
112         .close                  = line_close,
113         .write                  = line_write,
114         .put_char               = line_put_char,
115         .write_room             = line_write_room,
116         .chars_in_buffer        = line_chars_in_buffer,
117         .flush_buffer           = line_flush_buffer,
118         .flush_chars            = line_flush_chars,
119         .set_termios            = line_set_termios,
120         .ioctl                  = line_ioctl,
121         .throttle               = line_throttle,
122         .unthrottle             = line_unthrottle,
123 };
124
125 static void uml_console_write(struct console *console, const char *string,
126                               unsigned len)
127 {
128         struct line *line = &vts[console->index];
129         unsigned long flags;
130
131         spin_lock_irqsave(&line->lock, flags);
132         console_write_chan(&line->chan_list, string, len);
133         spin_unlock_irqrestore(&line->lock, flags);
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
146         return console_open_chan(line, co);
147 }
148
149 /* No locking for register_console call - relies on single-threaded initcalls */
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|CON_ANYTIME,
156         .index          = -1,
157 };
158
159 int stdio_init(void)
160 {
161         char *new_title;
162
163         console_driver = register_lines(&driver, &console_ops, vts,
164                                         ARRAY_SIZE(vts));
165         if (console_driver == NULL)
166                 return -1;
167         printk(KERN_INFO "Initialized stdio console driver\n");
168
169         new_title = add_xterm_umid(opts.xterm_title);
170         if(new_title != NULL)
171                 opts.xterm_title = new_title;
172
173         lines_init(vts, ARRAY_SIZE(vts), &opts);
174
175         con_init_done = 1;
176         register_console(&stdiocons);
177         return 0;
178 }
179 late_initcall(stdio_init);
180
181 static void console_exit(void)
182 {
183         if (!con_init_done)
184                 return;
185         close_lines(vts, ARRAY_SIZE(vts));
186 }
187 __uml_exitcall(console_exit);
188
189 static int console_chan_setup(char *str)
190 {
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;
200 }
201 __setup("con", console_chan_setup);
202 __channel_help(console_chan_setup, "con");