arch/um/drivers/stdio_console.c

Source file repositories/reference/linux-study-clean/arch/um/drivers/stdio_console.c

File Facts

System
Linux kernel
Corpus path
arch/um/drivers/stdio_console.c
Extension
.c
Size
4838 bytes
Lines
199
Domain
Architecture Layer
Bucket
arch/um
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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 */

Annotation

Implementation Notes