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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
*/
#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)
static 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_name = "console",
.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 char *vt_conf[MAX_TTYS];
static char *def_conf;
static struct line vts[MAX_TTYS];
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);
}
/* Set in an initcall, checked in an exitcall */
static int con_init_done;
static int con_install(struct tty_driver *driver, struct tty_struct *tty)
{
return line_install(driver, tty, &vts[tty->index]);
}
static const struct tty_operations console_ops = {
.open = line_open,
.install = con_install,
.close = line_close,
.write = line_write,
.write_room = line_write_room,
.chars_in_buffer = line_chars_in_buffer,
.flush_buffer = line_flush_buffer,
.flush_chars = line_flush_chars,
.throttle = line_throttle,
.unthrottle = line_unthrottle,
.hangup = line_hangup,
};
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_out, string, len);
spin_unlock_irqrestore(&line->lock, flags);
}
static struct tty_driver *uml_console_device(struct console *c, int *index)
{
*index = c->index;
return driver.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;
int err;
int i;
err = register_lines(&driver, &console_ops, vts,
ARRAY_SIZE(vts));
if (err)
return err;
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;
for (i = 0; i < MAX_TTYS; i++) {
char *error;
char *s = vt_conf[i];
if (!s)
s = def_conf;
if (!s)
s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
if (setup_one_line(vts, i, s, &opts, &error))
printk(KERN_ERR "setup_one_line failed for "
"device %d : %s\n", i, error);
}
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)
{
if (!strncmp(str, "sole=", 5)) /* console= option specifies tty */
return 0;
line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
return 1;
}
__setup("con", console_chan_setup);
__channel_help(console_chan_setup, "con");
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