// 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");