/* 
   * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
   * Licensed under the GPL
   */

  #include "linux/posix_types.h"
  #include "linux/tty.h"
  #include "linux/tty_flip.h"
  #include "linux/types.h"
  #include "linux/major.h"
  #include "linux/kdev_t.h"
  #include "linux/console.h"
  #include "linux/string.h"
  #include "linux/sched.h"
  #include "linux/list.h"
  #include "linux/init.h"
  #include "linux/interrupt.h"
  #include "linux/slab.h"
  #include "linux/hardirq.h"
  #include "asm/current.h"
  #include "asm/irq.h"
  #include "stdio_console.h"

  #include "chan.h"

  #include "irq_user.h"
  #include "mconsole_kern.h"
  #include "init.h"

  
  #define MAX_TTYS (16)

  /* Referenced only by tty_driver below - presumably it's locked correctly
   * by the tty driver.
   */
  
  static struct tty_driver *console_driver;

  static void stdio_announce(char *dev_name, int dev)

  {
  	printk(KERN_INFO "Virtual console %d assigned device '%s'
  ", dev,
  	       dev_name);
  }

  /* Almost const, except that xterm_title may be changed in an initcall */

  static struct chan_opts opts = {
  	.announce 	= stdio_announce,
  	.xterm_title	= "Virtual Console #%d",
  	.raw		= 1,

  };

  static int con_config(char *str, char **error_out);

  static int con_get_config(char *dev, char *str, int size, char **error_out);

  static int con_remove(int n, char **con_remove);

  
  /* Const, except for .mc.list */

  static struct line_driver driver = {
  	.name 			= "UML console",
  	.device_name 		= "tty",

  	.major 			= TTY_MAJOR,
  	.minor_start 		= 0,
  	.type 		 	= TTY_DRIVER_TYPE_CONSOLE,
  	.subtype 	 	= SYSTEM_TYPE_CONSOLE,
  	.read_irq 		= CONSOLE_IRQ,
  	.read_irq_name 		= "console",
  	.write_irq 		= CONSOLE_WRITE_IRQ,
  	.write_irq_name 	= "console-write",

  	.mc  = {

  		.list		= LIST_HEAD_INIT(driver.mc.list),

  		.name  		= "con",
  		.config 	= con_config,
  		.get_config 	= con_get_config,

  		.id		= line_id,

  		.remove 	= con_remove,
  	},
  };

  /* The array is initialized by line_init, at initcall time.  The
   * elements are locked individually as needed.

   */

  static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
  				     [ 1 ... MAX_TTYS - 1 ] =
  				     LINE_INIT(CONFIG_CON_CHAN, &driver) };

  static int con_config(char *str, char **error_out)

  {

  	return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);

  }
  
  static int con_get_config(char *dev, char *str, int size, char **error_out)
  {

  	return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);

  }

  static int con_remove(int n, char **error_out)

  {

  	return line_remove(vts, ARRAY_SIZE(vts), n, error_out);

  }
  
  static int con_open(struct tty_struct *tty, struct file *filp)
  {

  	int err = line_open(vts, tty);
  	if (err)
  		printk(KERN_ERR "Failed to open console %d, err = %d
  ",
  		       tty->index, err);
  
  	return err;

  }

  /* Set in an initcall, checked in an exitcall */

  static int con_init_done = 0;

  static const struct tty_operations console_ops = {

  	.open 	 		= con_open,
  	.close 	 		= line_close,
  	.write 	 		= line_write,

  	.put_char 		= line_put_char,

  	.write_room		= line_write_room,

  	.chars_in_buffer 	= line_chars_in_buffer,

  	.flush_buffer 		= line_flush_buffer,
  	.flush_chars 		= line_flush_chars,

  	.set_termios 		= line_set_termios,
  	.ioctl 	 		= line_ioctl,

  	.throttle 		= line_throttle,
  	.unthrottle 		= line_unthrottle,

  };
  
  static void uml_console_write(struct console *console, const char *string,

  			      unsigned len)

  {
  	struct line *line = &vts[console->index];

  	unsigned long flags;

  	spin_lock_irqsave(&line->lock, flags);

  	console_write_chan(&line->chan_list, string, len);

  	spin_unlock_irqrestore(&line->lock, flags);

  }
  
  static struct tty_driver *uml_console_device(struct console *c, int *index)
  {
  	*index = c->index;
  	return console_driver;
  }
  
  static int uml_console_setup(struct console *co, char *options)
  {
  	struct line *line = &vts[co->index];

  	return console_open_chan(line, co);

  }

  /* No locking for register_console call - relies on single-threaded initcalls */

  static struct console stdiocons = {
  	.name		= "tty",
  	.write		= uml_console_write,
  	.device		= uml_console_device,
  	.setup		= uml_console_setup,

  	.flags		= CON_PRINTBUFFER|CON_ANYTIME,

  	.index		= -1,

  };

  static int stdio_init(void)

  {
  	char *new_title;

  	console_driver = register_lines(&driver, &console_ops, vts,
  					ARRAY_SIZE(vts));

  	if (console_driver == NULL)

  		return -1;
  	printk(KERN_INFO "Initialized stdio console driver
  ");

  	new_title = add_xterm_umid(opts.xterm_title);
  	if(new_title != NULL)
  		opts.xterm_title = new_title;

  	lines_init(vts, ARRAY_SIZE(vts), &opts);

  	con_init_done = 1;
  	register_console(&stdiocons);

  	return 0;

  }
  late_initcall(stdio_init);
  
  static void console_exit(void)
  {
  	if (!con_init_done)
  		return;

  	close_lines(vts, ARRAY_SIZE(vts));

  }
  __uml_exitcall(console_exit);
  
  static int console_chan_setup(char *str)
  {

  	char *error;
  	int ret;
  
  	ret = line_setup(vts, ARRAY_SIZE(vts), str, &error);
  	if(ret < 0)
  		printk(KERN_ERR "Failed to set up console with "
  		       "configuration string \"%s\" : %s
  ", str, error);
  
  	return 1;

  }
  __setup("con", console_chan_setup);
  __channel_help(console_chan_setup, "con");