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/config.h"
7#include "linux/posix_types.h"
8#include "linux/tty.h"
9#include "linux/tty_flip.h"
10#include "linux/types.h"
11#include "linux/major.h"
12#include "linux/kdev_t.h"
13#include "linux/console.h"
14#include "linux/string.h"
15#include "linux/sched.h"
16#include "linux/list.h"
17#include "linux/init.h"
18#include "linux/interrupt.h"
19#include "linux/slab.h"
20#include "linux/hardirq.h"
21#include "asm/current.h"
22#include "asm/irq.h"
23#include "stdio_console.h"
24#include "line.h"
25#include "chan_kern.h"
26#include "user_util.h"
27#include "kern_util.h"
28#include "irq_user.h"
29#include "mconsole_kern.h"
30#include "init.h"
31
32#define MAX_TTYS (16)
33
34/* ----------------------------------------------------------------------------- */
35
36/* Referenced only by tty_driver below - presumably it's locked correctly
37 * by the tty driver.
38 */
39
40static struct tty_driver *console_driver;
41
42void stdio_announce(char *dev_name, int dev)
43{
44 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
45 dev_name);
46}
47
48static struct chan_opts opts = {
49 .announce = stdio_announce,
50 .xterm_title = "Virtual Console #%d",
51 .raw = 1,
52 .tramp_stack = 0,
53 .in_kernel = 1,
54};
55
56static int con_config(char *str);
57static int con_get_config(char *dev, char *str, int size, char **error_out);
58static int con_remove(int n);
59
60static struct line_driver driver = {
61 .name = "UML console",
62 .device_name = "tty",
63 .devfs_name = "vc/",
64 .major = TTY_MAJOR,
65 .minor_start = 0,
66 .type = TTY_DRIVER_TYPE_CONSOLE,
67 .subtype = SYSTEM_TYPE_CONSOLE,
68 .read_irq = CONSOLE_IRQ,
69 .read_irq_name = "console",
70 .write_irq = CONSOLE_WRITE_IRQ,
71 .write_irq_name = "console-write",
72 .symlink_from = "ttys",
73 .symlink_to = "vc",
74 .mc = {
75 .name = "con",
76 .config = con_config,
77 .get_config = con_get_config,
78 .id = line_id,
79 .remove = con_remove,
80 },
81};
82
83static struct lines console_lines = LINES_INIT(MAX_TTYS);
84
85/* The array is initialized by line_init, which is an initcall. The
86 * individual elements are protected by individual semaphores.
87 */
88struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
89 [ 1 ... MAX_TTYS - 1 ] =
90 LINE_INIT(CONFIG_CON_CHAN, &driver) };
91
92static int con_config(char *str)
93{
94 return(line_config(vts, sizeof(vts)/sizeof(vts[0]), str));
95}
96
97static int con_get_config(char *dev, char *str, int size, char **error_out)
98{
99 return(line_get_config(dev, vts, sizeof(vts)/sizeof(vts[0]), str,
100 size, error_out));
101}
102
103static int con_remove(int n)
104{
105 return line_remove(vts, sizeof(vts)/sizeof(vts[0]), n);
106}
107
108static int con_open(struct tty_struct *tty, struct file *filp)
109{
110 return line_open(vts, tty, &opts);
111}
112
113static int con_init_done = 0;
114
115static struct tty_operations console_ops = {
116 .open = con_open,
117 .close = line_close,
118 .write = line_write,
119 .put_char = line_put_char,
120 .write_room = line_write_room,
121 .chars_in_buffer = line_chars_in_buffer,
122 .flush_buffer = line_flush_buffer,
123 .flush_chars = line_flush_chars,
124 .set_termios = line_set_termios,
125 .ioctl = line_ioctl,
126};
127
128static void uml_console_write(struct console *console, const char *string,
129 unsigned len)
130{
131 struct line *line = &vts[console->index];
132 unsigned long flags;
133
134 spin_lock_irqsave(&line->lock, flags);
135 console_write_chan(&line->chan_list, string, len);
136 spin_unlock_irqrestore(&line->lock, flags);
137}
138
139static struct tty_driver *uml_console_device(struct console *c, int *index)
140{
141 *index = c->index;
142 return console_driver;
143}
144
145static int uml_console_setup(struct console *co, char *options)
146{
147 struct line *line = &vts[co->index];
148
149 return console_open_chan(line,co,&opts);
150}
151
152static struct console stdiocons = {
153 .name = "tty",
154 .write = uml_console_write,
155 .device = uml_console_device,
156 .setup = uml_console_setup,
157 .flags = CON_PRINTBUFFER,
158 .index = -1,
159 .data = &vts,
160};
161
162int stdio_init(void)
163{
164 char *new_title;
165
166 console_driver = line_register_devfs(&console_lines, &driver,
167 &console_ops, vts,
168 ARRAY_SIZE(vts));
169 if (NULL == console_driver)
170 return -1;
171 printk(KERN_INFO "Initialized stdio console driver\n");
172
173 lines_init(vts, sizeof(vts)/sizeof(vts[0]));
174
175 new_title = add_xterm_umid(opts.xterm_title);
176 if(new_title != NULL)
177 opts.xterm_title = new_title;
178
179 con_init_done = 1;
180 register_console(&stdiocons);
181 return(0);
182}
183late_initcall(stdio_init);
184
185static void console_exit(void)
186{
187 if (!con_init_done)
188 return;
189 close_lines(vts, sizeof(vts)/sizeof(vts[0]));
190}
191__uml_exitcall(console_exit);
192
193static int console_chan_setup(char *str)
194{
195 return(line_setup(vts, sizeof(vts)/sizeof(vts[0]), str, 1));
196}
197__setup("con", console_chan_setup);
198__channel_help(console_chan_setup, "con");