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/arch/um/drivers/stdio_console.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 204 lines | 158 code | 32 blank | 14 comment | 7 complexity | fd28cc6e9bbb9bfc03b3b34f042b5acd MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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 "irq_user.h"
 26#include "mconsole_kern.h"
 27#include "init.h"
 28
 29#define MAX_TTYS (16)
 30
 31/* Referenced only by tty_driver below - presumably it's locked correctly
 32 * by the tty driver.
 33 */
 34
 35static struct tty_driver *console_driver;
 36
 37static void stdio_announce(char *dev_name, int dev)
 38{
 39	printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
 40	       dev_name);
 41}
 42
 43/* Almost const, except that xterm_title may be changed in an initcall */
 44static struct chan_opts opts = {
 45	.announce 	= stdio_announce,
 46	.xterm_title	= "Virtual Console #%d",
 47	.raw		= 1,
 48};
 49
 50static int con_config(char *str, char **error_out);
 51static int con_get_config(char *dev, char *str, int size, char **error_out);
 52static int con_remove(int n, char **con_remove);
 53
 54
 55/* Const, except for .mc.list */
 56static struct line_driver driver = {
 57	.name 			= "UML console",
 58	.device_name 		= "tty",
 59	.major 			= TTY_MAJOR,
 60	.minor_start 		= 0,
 61	.type 		 	= TTY_DRIVER_TYPE_CONSOLE,
 62	.subtype 	 	= SYSTEM_TYPE_CONSOLE,
 63	.read_irq 		= CONSOLE_IRQ,
 64	.read_irq_name 		= "console",
 65	.write_irq 		= CONSOLE_WRITE_IRQ,
 66	.write_irq_name 	= "console-write",
 67	.mc  = {
 68		.list		= LIST_HEAD_INIT(driver.mc.list),
 69		.name  		= "con",
 70		.config 	= con_config,
 71		.get_config 	= con_get_config,
 72		.id		= line_id,
 73		.remove 	= con_remove,
 74	},
 75};
 76
 77/* The array is initialized by line_init, at initcall time.  The
 78 * elements are locked individually as needed.
 79 */
 80static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
 81				     [ 1 ... MAX_TTYS - 1 ] =
 82				     LINE_INIT(CONFIG_CON_CHAN, &driver) };
 83
 84static int con_config(char *str, char **error_out)
 85{
 86	return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
 87}
 88
 89static int con_get_config(char *dev, char *str, int size, char **error_out)
 90{
 91	return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
 92}
 93
 94static int con_remove(int n, char **error_out)
 95{
 96	return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
 97}
 98
 99static int con_open(struct tty_struct *tty, struct file *filp)
100{
101	int err = line_open(vts, tty);
102	if (err)
103		printk(KERN_ERR "Failed to open console %d, err = %d\n",
104		       tty->index, err);
105
106	return err;
107}
108
109/* Set in an initcall, checked in an exitcall */
110static int con_init_done = 0;
111
112static const struct tty_operations console_ops = {
113	.open 	 		= con_open,
114	.close 	 		= line_close,
115	.write 	 		= line_write,
116	.put_char 		= line_put_char,
117	.write_room		= line_write_room,
118	.chars_in_buffer 	= line_chars_in_buffer,
119	.flush_buffer 		= line_flush_buffer,
120	.flush_chars 		= line_flush_chars,
121	.set_termios 		= line_set_termios,
122	.ioctl 	 		= line_ioctl,
123	.throttle 		= line_throttle,
124	.unthrottle 		= line_unthrottle,
125};
126
127static void uml_console_write(struct console *console, const char *string,
128			      unsigned len)
129{
130	struct line *line = &vts[console->index];
131	unsigned long flags;
132
133	spin_lock_irqsave(&line->lock, flags);
134	console_write_chan(&line->chan_list, string, len);
135	spin_unlock_irqrestore(&line->lock, flags);
136}
137
138static struct tty_driver *uml_console_device(struct console *c, int *index)
139{
140	*index = c->index;
141	return console_driver;
142}
143
144static int uml_console_setup(struct console *co, char *options)
145{
146	struct line *line = &vts[co->index];
147
148	return console_open_chan(line, co);
149}
150
151/* No locking for register_console call - relies on single-threaded initcalls */
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|CON_ANYTIME,
158	.index		= -1,
159};
160
161static int stdio_init(void)
162{
163	char *new_title;
164
165	console_driver = register_lines(&driver, &console_ops, vts,
166					ARRAY_SIZE(vts));
167	if (console_driver == NULL)
168		return -1;
169	printk(KERN_INFO "Initialized stdio console driver\n");
170
171	new_title = add_xterm_umid(opts.xterm_title);
172	if(new_title != NULL)
173		opts.xterm_title = new_title;
174
175	lines_init(vts, ARRAY_SIZE(vts), &opts);
176
177	con_init_done = 1;
178	register_console(&stdiocons);
179	return 0;
180}
181late_initcall(stdio_init);
182
183static void console_exit(void)
184{
185	if (!con_init_done)
186		return;
187	close_lines(vts, ARRAY_SIZE(vts));
188}
189__uml_exitcall(console_exit);
190
191static int console_chan_setup(char *str)
192{
193	char *error;
194	int ret;
195
196	ret = line_setup(vts, ARRAY_SIZE(vts), str, &error);
197	if(ret < 0)
198		printk(KERN_ERR "Failed to set up console with "
199		       "configuration string \"%s\" : %s\n", str, error);
200
201	return 1;
202}
203__setup("con", console_chan_setup);
204__channel_help(console_chan_setup, "con");