linux/kernel/debug/kdb/kdb_keyboard.c

/*
 * Kernel Debugger Architecture Dependent Console I/O handler
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.
 *
 * Copyright (c) 1999-2006 Silicon Graphics, Inc.  All Rights Reserved.
 * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
 */

#include <linux/kdb.h>
#include <linux/keyboard.h>
#include <linux/ctype.h>
#include <linux/io.h>

#include "kdb_private.h"

/* Keyboard Controller Registers on normal PCs. */

#define KBD_STATUS_REG …
#define KBD_DATA_REG …

/* Status Register Bits */

#define KBD_STAT_OBF …
#define KBD_STAT_MOUSE_OBF …

static int kbd_exists;
static int kbd_last_ret;

/*
 * Check if the keyboard controller has a keypress for us.
 * Some parts (Enter Release, LED change) are still blocking polled here,
 * but hopefully they are all short.
 */
int kdb_get_kbd_char(void)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * Best effort cleanup of ENTER break codes on leaving KDB. Called on
 * exiting KDB, when we know we processed an ENTER or KP ENTER scan
 * code.
 */
void kdb_kbd_cleanup_state(void)
{ … }