1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
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 static void stdio_announce(char *dev_name, int dev)
32 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
36 /* Almost const, except that xterm_title may be changed in an initcall */
37 static struct chan_opts opts = {
38 .announce = stdio_announce,
39 .xterm_title = "Virtual Console #%d",
43 static int con_config(char *str, char **error_out);
44 static int con_get_config(char *dev, char *str, int size, char **error_out);
45 static int con_remove(int n, char **con_remove);
48 /* Const, except for .mc.list */
49 static struct line_driver driver = {
50 .name = "UML console",
54 .type = TTY_DRIVER_TYPE_CONSOLE,
55 .subtype = SYSTEM_TYPE_CONSOLE,
56 .read_irq = CONSOLE_IRQ,
57 .read_irq_name = "console",
58 .write_irq = CONSOLE_WRITE_IRQ,
59 .write_irq_name = "console-write",
61 .list = LIST_HEAD_INIT(driver.mc.list),
64 .get_config = con_get_config,
70 /* The array is initialized by line_init, at initcall time. The
71 * elements are locked individually as needed.
73 static char *vt_conf[MAX_TTYS];
74 static char *def_conf;
75 static struct line vts[MAX_TTYS];
77 static int con_config(char *str, char **error_out)
79 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
82 static int con_get_config(char *dev, char *str, int size, char **error_out)
84 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
87 static int con_remove(int n, char **error_out)
89 return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
92 /* Set in an initcall, checked in an exitcall */
93 static int con_init_done = 0;
95 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
97 return line_install(driver, tty, &vts[tty->index]);
100 static const struct tty_operations console_ops = {
102 .install = con_install,
105 .write_room = line_write_room,
106 .chars_in_buffer = line_chars_in_buffer,
107 .flush_buffer = line_flush_buffer,
108 .flush_chars = line_flush_chars,
109 .set_termios = line_set_termios,
110 .throttle = line_throttle,
111 .unthrottle = line_unthrottle,
112 .hangup = line_hangup,
115 static void uml_console_write(struct console *console, const char *string,
118 struct line *line = &vts[console->index];
121 spin_lock_irqsave(&line->lock, flags);
122 console_write_chan(line->chan_out, string, len);
123 spin_unlock_irqrestore(&line->lock, flags);
126 static struct tty_driver *uml_console_device(struct console *c, int *index)
129 return driver.driver;
132 static int uml_console_setup(struct console *co, char *options)
134 struct line *line = &vts[co->index];
136 return console_open_chan(line, co);
139 /* No locking for register_console call - relies on single-threaded initcalls */
140 static struct console stdiocons = {
142 .write = uml_console_write,
143 .device = uml_console_device,
144 .setup = uml_console_setup,
145 .flags = CON_PRINTBUFFER|CON_ANYTIME,
149 static int stdio_init(void)
155 err = register_lines(&driver, &console_ops, vts,
160 printk(KERN_INFO "Initialized stdio console driver\n");
162 new_title = add_xterm_umid(opts.xterm_title);
163 if(new_title != NULL)
164 opts.xterm_title = new_title;
166 for (i = 0; i < MAX_TTYS; i++) {
168 char *s = vt_conf[i];
172 s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
173 if (setup_one_line(vts, i, s, &opts, &error))
174 printk(KERN_ERR "setup_one_line failed for "
175 "device %d : %s\n", i, error);
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 if (!strncmp(str, "sole=", 5)) /* console= option specifies tty */
197 line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
200 __setup("con", console_chan_setup);
201 __channel_help(console_chan_setup, "con");