2 * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/posix_types.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"
22 #include "stdio_console.h"
24 #include "chan_kern.h"
25 #include "user_util.h"
26 #include "kern_util.h"
28 #include "mconsole_kern.h"
33 /* ----------------------------------------------------------------------------- */
35 /* Referenced only by tty_driver below - presumably it's locked correctly
39 static struct tty_driver *console_driver;
41 void stdio_announce(char *dev_name, int dev)
43 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
47 static struct chan_opts opts = {
48 .announce = stdio_announce,
49 .xterm_title = "Virtual Console #%d",
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);
59 static struct line_driver driver = {
60 .name = "UML console",
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",
75 .get_config = con_get_config,
81 static struct lines console_lines = LINES_INIT(MAX_TTYS);
83 /* The array is initialized by line_init, which is an initcall. The
84 * individual elements are protected by individual semaphores.
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) };
90 static int con_config(char *str)
92 return line_config(vts, ARRAY_SIZE(vts), str, &opts);
95 static int con_get_config(char *dev, char *str, int size, char **error_out)
97 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
100 static int con_remove(int n)
102 return line_remove(vts, ARRAY_SIZE(vts), n);
105 static int con_open(struct tty_struct *tty, struct file *filp)
107 return line_open(vts, tty);
110 static int con_init_done = 0;
112 static struct tty_operations console_ops = {
116 .put_char = line_put_char,
117 .write_room = line_write_room,
118 .chars_in_buffer = line_chars_in_buffer,
119 .flush_buffer = line_flush_buffer,
120 .flush_chars = line_flush_chars,
121 .set_termios = line_set_termios,
123 .throttle = line_throttle,
124 .unthrottle = line_unthrottle,
127 static void uml_console_write(struct console *console, const char *string,
130 struct line *line = &vts[console->index];
133 spin_lock_irqsave(&line->lock, flags);
134 console_write_chan(&line->chan_list, string, len);
135 spin_unlock_irqrestore(&line->lock, flags);
138 static struct tty_driver *uml_console_device(struct console *c, int *index)
141 return console_driver;
144 static int uml_console_setup(struct console *co, char *options)
146 struct line *line = &vts[co->index];
148 return console_open_chan(line, co, &opts);
151 static struct console stdiocons = {
153 .write = uml_console_write,
154 .device = uml_console_device,
155 .setup = uml_console_setup,
156 .flags = CON_PRINTBUFFER,
165 console_driver = line_register_devfs(&console_lines, &driver,
168 if (console_driver == NULL)
170 printk(KERN_INFO "Initialized stdio console driver\n");
172 lines_init(vts, ARRAY_SIZE(vts), &opts);
174 new_title = add_xterm_umid(opts.xterm_title);
175 if(new_title != NULL)
176 opts.xterm_title = new_title;
179 register_console(&stdiocons);
182 late_initcall(stdio_init);
184 static void console_exit(void)
188 close_lines(vts, ARRAY_SIZE(vts));
190 __uml_exitcall(console_exit);
192 static int console_chan_setup(char *str)
194 return line_setup(vts, ARRAY_SIZE(vts), str);
196 __setup("con", console_chan_setup);
197 __channel_help(console_chan_setup, "con");