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"
25 #include "mconsole_kern.h"
30 /* Referenced only by tty_driver below - presumably it's locked correctly
34 static struct tty_driver *console_driver;
36 static void stdio_announce(char *dev_name, int dev)
38 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
42 /* Almost const, except that xterm_title may be changed in an initcall */
43 static struct chan_opts opts = {
44 .announce = stdio_announce,
45 .xterm_title = "Virtual Console #%d",
49 static int con_config(char *str, char **error_out);
50 static int con_get_config(char *dev, char *str, int size, char **error_out);
51 static int con_remove(int n, char **con_remove);
54 /* Const, except for .mc.list */
55 static struct line_driver driver = {
56 .name = "UML console",
60 .type = TTY_DRIVER_TYPE_CONSOLE,
61 .subtype = SYSTEM_TYPE_CONSOLE,
62 .read_irq = CONSOLE_IRQ,
63 .read_irq_name = "console",
64 .write_irq = CONSOLE_WRITE_IRQ,
65 .write_irq_name = "console-write",
67 .list = LIST_HEAD_INIT(driver.mc.list),
70 .get_config = con_get_config,
76 /* The array is initialized by line_init, at initcall time. The
77 * elements are locked individually as needed.
79 static char *vt_conf[MAX_TTYS];
80 static char *def_conf;
81 static struct line vts[MAX_TTYS];
83 static int con_config(char *str, char **error_out)
85 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
88 static int con_get_config(char *dev, char *str, int size, char **error_out)
90 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
93 static int con_remove(int n, char **error_out)
95 return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
98 static int con_open(struct tty_struct *tty, struct file *filp)
100 int err = line_open(vts, tty);
102 printk(KERN_ERR "Failed to open console %d, err = %d\n",
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);
150 /* No locking for register_console call - relies on single-threaded initcalls */
151 static struct console stdiocons = {
153 .write = uml_console_write,
154 .device = uml_console_device,
155 .setup = uml_console_setup,
156 .flags = CON_PRINTBUFFER|CON_ANYTIME,
160 static int stdio_init(void)
165 for (i = 0; i < MAX_TTYS; i++) {
166 char *s = vt_conf[i];
170 s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
171 if (s && strcmp(s, "none") != 0) {
175 spin_lock_init(&vts[i].lock);
176 spin_lock_init(&vts[i].count_lock);
177 vts[i].driver = &driver;
179 console_driver = register_lines(&driver, &console_ops, vts,
181 if (console_driver == NULL)
183 printk(KERN_INFO "Initialized stdio console driver\n");
185 new_title = add_xterm_umid(opts.xterm_title);
186 if(new_title != NULL)
187 opts.xterm_title = new_title;
189 lines_init(vts, ARRAY_SIZE(vts), &opts);
192 register_console(&stdiocons);
195 late_initcall(stdio_init);
197 static void console_exit(void)
201 close_lines(vts, ARRAY_SIZE(vts));
203 __uml_exitcall(console_exit);
205 static int console_chan_setup(char *str)
207 line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
210 __setup("con", console_chan_setup);
211 __channel_help(console_chan_setup, "con");