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stdio_console.c

/* 
 * 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 "line.h"
#include "chan_kern.h"
#include "kern_util.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;

void stdio_announce(char *dev_name, int dev)
{
      printk(KERN_INFO "Virtual console %d assigned device '%s'\n", 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\n",
                   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,
};

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\n");

      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\n", str, error);

      return 1;
}
__setup("con", console_chan_setup);
__channel_help(console_chan_setup, "con");

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