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 /* Referenced only by tty_driver below - presumably it's locked correctly
37 static struct tty_driver *console_driver;
39 void stdio_announce(char *dev_name, int dev)
41 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
45 static struct chan_opts opts = {
46 .announce = stdio_announce,
47 .xterm_title = "Virtual Console #%d",
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);
57 static struct line_driver driver = {
58 .name = "UML console",
62 .type = TTY_DRIVER_TYPE_CONSOLE,
63 .subtype = SYSTEM_TYPE_CONSOLE,
64 .read_irq = CONSOLE_IRQ,
65 .read_irq_name = "console",
66 .write_irq = CONSOLE_WRITE_IRQ,
67 .write_irq_name = "console-write",
68 .symlink_from = "ttys",
73 .get_config = con_get_config,
79 static struct lines console_lines = LINES_INIT(MAX_TTYS);
81 /* The array is initialized by line_init, which is an initcall. The
82 * individual elements are protected by individual semaphores.
84 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
85 [ 1 ... MAX_TTYS - 1 ] =
86 LINE_INIT(CONFIG_CON_CHAN, &driver) };
88 static int con_config(char *str, char **error_out)
90 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
93 static int con_get_config(char *dev, char *str, int size, char **error_out)
95 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
98 static int con_remove(int n, char **error_out)
100 return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
103 static int con_open(struct tty_struct *tty, struct file *filp)
105 return line_open(vts, tty);
108 /* Set in an initcall, checked in an exitcall */
109 static int con_init_done = 0;
111 static const struct tty_operations console_ops = {
115 .put_char = line_put_char,
116 .write_room = line_write_room,
117 .chars_in_buffer = line_chars_in_buffer,
118 .flush_buffer = line_flush_buffer,
119 .flush_chars = line_flush_chars,
120 .set_termios = line_set_termios,
122 .throttle = line_throttle,
123 .unthrottle = line_unthrottle,
126 static void uml_console_write(struct console *console, const char *string,
129 struct line *line = &vts[console->index];
132 spin_lock_irqsave(&line->lock, flags);
133 console_write_chan(&line->chan_list, string, len);
134 spin_unlock_irqrestore(&line->lock, flags);
137 static struct tty_driver *uml_console_device(struct console *c, int *index)
140 return console_driver;
143 static int uml_console_setup(struct console *co, char *options)
145 struct line *line = &vts[co->index];
147 return console_open_chan(line, co, &opts);
150 static struct console stdiocons = {
152 .write = uml_console_write,
153 .device = uml_console_device,
154 .setup = uml_console_setup,
155 .flags = CON_PRINTBUFFER,
164 console_driver = line_register_devfs(&console_lines, &driver,
167 if (console_driver == NULL)
169 printk(KERN_INFO "Initialized stdio console driver\n");
171 lines_init(vts, ARRAY_SIZE(vts), &opts);
173 new_title = add_xterm_umid(opts.xterm_title);
174 if(new_title != NULL)
175 opts.xterm_title = new_title;
178 register_console(&stdiocons);
181 late_initcall(stdio_init);
183 static void console_exit(void)
187 close_lines(vts, ARRAY_SIZE(vts));
189 __uml_exitcall(console_exit);
191 static int console_chan_setup(char *str)
196 ret = line_setup(vts, ARRAY_SIZE(vts), str, &error);
198 printk(KERN_ERR "Failed to set up console with "
199 "configuration string \"%s\" : %s\n", str, error);
203 __setup("con", console_chan_setup);
204 __channel_help(console_chan_setup, "con");