Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 "chan.h"
24#include "irq_user.h"
25#include "mconsole_kern.h"
26#include "init.h"
27
28#define MAX_TTYS (16)
29
30static void stdio_announce(char *dev_name, int dev)
31{
32 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
33 dev_name);
34}
35
36/* Almost const, except that xterm_title may be changed in an initcall */
37static struct chan_opts opts = {
38 .announce = stdio_announce,
39 .xterm_title = "Virtual Console #%d",
40 .raw = 1,
41};
42
43static int con_config(char *str, char **error_out);
44static int con_get_config(char *dev, char *str, int size, char **error_out);
45static int con_remove(int n, char **con_remove);
46
47
48/* Const, except for .mc.list */
49static struct line_driver driver = {
50 .name = "UML console",
51 .device_name = "tty",
52 .major = TTY_MAJOR,
53 .minor_start = 0,
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",
60 .mc = {
61 .list = LIST_HEAD_INIT(driver.mc.list),
62 .name = "con",
63 .config = con_config,
64 .get_config = con_get_config,
65 .id = line_id,
66 .remove = con_remove,
67 },
68};
69
70/* The array is initialized by line_init, at initcall time. The
71 * elements are locked individually as needed.
72 */
73static char *vt_conf[MAX_TTYS];
74static char *def_conf;
75static struct line vts[MAX_TTYS];
76
77static int con_config(char *str, char **error_out)
78{
79 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
80}
81
82static int con_get_config(char *dev, char *str, int size, char **error_out)
83{
84 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
85}
86
87static int con_remove(int n, char **error_out)
88{
89 return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
90}
91
92/* Set in an initcall, checked in an exitcall */
93static int con_init_done = 0;
94
95static int con_install(struct tty_driver *driver, struct tty_struct *tty)
96{
97 return line_install(driver, tty, &vts[tty->index]);
98}
99
100static const struct tty_operations console_ops = {
101 .open = line_open,
102 .install = con_install,
103 .close = line_close,
104 .write = line_write,
105 .put_char = line_put_char,
106 .write_room = line_write_room,
107 .chars_in_buffer = line_chars_in_buffer,
108 .flush_buffer = line_flush_buffer,
109 .flush_chars = line_flush_chars,
110 .set_termios = line_set_termios,
111 .throttle = line_throttle,
112 .unthrottle = line_unthrottle,
113 .cleanup = line_cleanup,
114 .hangup = line_hangup,
115};
116
117static void uml_console_write(struct console *console, const char *string,
118 unsigned len)
119{
120 struct line *line = &vts[console->index];
121 unsigned long flags;
122
123 spin_lock_irqsave(&line->lock, flags);
124 console_write_chan(line->chan_out, string, len);
125 spin_unlock_irqrestore(&line->lock, flags);
126}
127
128static struct tty_driver *uml_console_device(struct console *c, int *index)
129{
130 *index = c->index;
131 return driver.driver;
132}
133
134static int uml_console_setup(struct console *co, char *options)
135{
136 struct line *line = &vts[co->index];
137
138 return console_open_chan(line, co);
139}
140
141/* No locking for register_console call - relies on single-threaded initcalls */
142static struct console stdiocons = {
143 .name = "tty",
144 .write = uml_console_write,
145 .device = uml_console_device,
146 .setup = uml_console_setup,
147 .flags = CON_PRINTBUFFER|CON_ANYTIME,
148 .index = -1,
149};
150
151static int stdio_init(void)
152{
153 char *new_title;
154 int err;
155 int i;
156
157 err = register_lines(&driver, &console_ops, vts,
158 ARRAY_SIZE(vts));
159 if (err)
160 return err;
161
162 printk(KERN_INFO "Initialized stdio console driver\n");
163
164 new_title = add_xterm_umid(opts.xterm_title);
165 if(new_title != NULL)
166 opts.xterm_title = new_title;
167
168 for (i = 0; i < MAX_TTYS; i++) {
169 char *error;
170 char *s = vt_conf[i];
171 if (!s)
172 s = def_conf;
173 if (!s)
174 s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
175 if (setup_one_line(vts, i, s, &opts, &error))
176 printk(KERN_ERR "setup_one_line failed for "
177 "device %d : %s\n", i, error);
178 }
179
180 con_init_done = 1;
181 register_console(&stdiocons);
182 return 0;
183}
184late_initcall(stdio_init);
185
186static void console_exit(void)
187{
188 if (!con_init_done)
189 return;
190 close_lines(vts, ARRAY_SIZE(vts));
191}
192__uml_exitcall(console_exit);
193
194static int console_chan_setup(char *str)
195{
196 line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
197 return 1;
198}
199__setup("con", console_chan_setup);
200__channel_help(console_chan_setup, "con");