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 "line.h"
24#include "chan_kern.h"
25#include "kern_util.h"
26#include "irq_user.h"
27#include "mconsole_kern.h"
28#include "init.h"
29
30#define MAX_TTYS (16)
31
32/* Referenced only by tty_driver below - presumably it's locked correctly
33 * by the tty driver.
34 */
35
36static struct tty_driver *console_driver;
37
38void stdio_announce(char *dev_name, int dev)
39{
40	printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
41	       dev_name);
42}
43
44/* Almost const, except that xterm_title may be changed in an initcall */
45static struct chan_opts opts = {
46	.announce 	= stdio_announce,
47	.xterm_title	= "Virtual Console #%d",
48	.raw		= 1,
49	.tramp_stack 	= 0,
50	.in_kernel 	= 1,
51};
52
53static int con_config(char *str, char **error_out);
54static int con_get_config(char *dev, char *str, int size, char **error_out);
55static int con_remove(int n, char **con_remove);
56
57
58/* Const, except for .mc.list */
59static struct line_driver driver = {
60	.name 			= "UML console",
61	.device_name 		= "tty",
62	.major 			= TTY_MAJOR,
63	.minor_start 		= 0,
64	.type 		 	= TTY_DRIVER_TYPE_CONSOLE,
65	.subtype 	 	= SYSTEM_TYPE_CONSOLE,
66	.read_irq 		= CONSOLE_IRQ,
67	.read_irq_name 		= "console",
68	.write_irq 		= CONSOLE_WRITE_IRQ,
69	.write_irq_name 	= "console-write",
70	.mc  = {
71		.list		= LIST_HEAD_INIT(driver.mc.list),
72		.name  		= "con",
73		.config 	= con_config,
74		.get_config 	= con_get_config,
75		.id		= line_id,
76		.remove 	= con_remove,
77	},
78};
79
80/* The array is initialized by line_init, at initcall time.  The
81 * elements are locked individually as needed.
82 */
83static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
84				     [ 1 ... MAX_TTYS - 1 ] =
85				     LINE_INIT(CONFIG_CON_CHAN, &driver) };
86
87static int con_config(char *str, char **error_out)
88{
89	return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
90}
91
92static int con_get_config(char *dev, char *str, int size, char **error_out)
93{
94	return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
95}
96
97static int con_remove(int n, char **error_out)
98{
99	return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
100}
101
102static int con_open(struct tty_struct *tty, struct file *filp)
103{
104	return line_open(vts, tty);
105}
106
107/* Set in an initcall, checked in an exitcall */
108static int con_init_done = 0;
109
110static const struct tty_operations console_ops = {
111	.open 	 		= con_open,
112	.close 	 		= line_close,
113	.write 	 		= line_write,
114	.put_char 		= line_put_char,
115	.write_room		= line_write_room,
116	.chars_in_buffer 	= line_chars_in_buffer,
117	.flush_buffer 		= line_flush_buffer,
118	.flush_chars 		= line_flush_chars,
119	.set_termios 		= line_set_termios,
120	.ioctl 	 		= line_ioctl,
121	.throttle 		= line_throttle,
122	.unthrottle 		= line_unthrottle,
123};
124
125static void uml_console_write(struct console *console, const char *string,
126			      unsigned len)
127{
128	struct line *line = &vts[console->index];
129	unsigned long flags;
130
131	spin_lock_irqsave(&line->lock, flags);
132	console_write_chan(&line->chan_list, string, len);
133	spin_unlock_irqrestore(&line->lock, flags);
134}
135
136static struct tty_driver *uml_console_device(struct console *c, int *index)
137{
138	*index = c->index;
139	return console_driver;
140}
141
142static int uml_console_setup(struct console *co, char *options)
143{
144	struct line *line = &vts[co->index];
145
146	return console_open_chan(line, co);
147}
148
149/* No locking for register_console call - relies on single-threaded initcalls */
150static struct console stdiocons = {
151	.name		= "tty",
152	.write		= uml_console_write,
153	.device		= uml_console_device,
154	.setup		= uml_console_setup,
155	.flags		= CON_PRINTBUFFER|CON_ANYTIME,
156	.index		= -1,
157};
158
159int stdio_init(void)
160{
161	char *new_title;
162
163	console_driver = register_lines(&driver, &console_ops, vts,
164					ARRAY_SIZE(vts));
165	if (console_driver == NULL)
166		return -1;
167	printk(KERN_INFO "Initialized stdio console driver\n");
168
169	new_title = add_xterm_umid(opts.xterm_title);
170	if(new_title != NULL)
171		opts.xterm_title = new_title;
172
173	lines_init(vts, ARRAY_SIZE(vts), &opts);
174
175	con_init_done = 1;
176	register_console(&stdiocons);
177	return 0;
178}
179late_initcall(stdio_init);
180
181static void console_exit(void)
182{
183	if (!con_init_done)
184		return;
185	close_lines(vts, ARRAY_SIZE(vts));
186}
187__uml_exitcall(console_exit);
188
189static int console_chan_setup(char *str)
190{
191	char *error;
192	int ret;
193
194	ret = line_setup(vts, ARRAY_SIZE(vts), str, &error);
195	if(ret < 0)
196		printk(KERN_ERR "Failed to set up console with "
197		       "configuration string \"%s\" : %s\n", str, error);
198
199	return 1;
200}
201__setup("con", console_chan_setup);
202__channel_help(console_chan_setup, "con");
203