2010-05-21 09:04:24 +07:00
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/*
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* Kernel Debugger Architecture Dependent Console I/O handler
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License.
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*
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* Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
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*/
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#include <linux/kdb.h>
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#include <linux/keyboard.h>
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#include <linux/ctype.h>
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#include <linux/module.h>
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#include <linux/io.h>
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/* Keyboard Controller Registers on normal PCs. */
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#define KBD_STATUS_REG 0x64 /* Status register (R) */
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#define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */
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/* Status Register Bits */
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#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
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#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
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static int kbd_exists;
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2012-02-28 19:55:05 +07:00
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static int kbd_last_ret;
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2010-05-21 09:04:24 +07:00
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/*
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* Check if the keyboard controller has a keypress for us.
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* Some parts (Enter Release, LED change) are still blocking polled here,
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* but hopefully they are all short.
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*/
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int kdb_get_kbd_char(void)
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{
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int scancode, scanstatus;
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static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */
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static int shift_key; /* Shift next keypress */
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static int ctrl_key;
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u_short keychar;
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if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
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(inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) {
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kbd_exists = 0;
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return -1;
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}
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kbd_exists = 1;
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if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
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return -1;
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/*
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* Fetch the scancode
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*/
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scancode = inb(KBD_DATA_REG);
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scanstatus = inb(KBD_STATUS_REG);
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/*
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* Ignore mouse events.
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*/
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if (scanstatus & KBD_STAT_MOUSE_OBF)
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return -1;
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/*
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* Ignore release, trigger on make
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* (except for shift keys, where we want to
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* keep the shift state so long as the key is
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* held down).
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*/
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if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) {
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/*
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* Next key may use shift table
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*/
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if ((scancode & 0x80) == 0)
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shift_key = 1;
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else
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shift_key = 0;
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return -1;
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}
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if ((scancode&0x7f) == 0x1d) {
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/*
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* Left ctrl key
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*/
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if ((scancode & 0x80) == 0)
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ctrl_key = 1;
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else
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ctrl_key = 0;
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return -1;
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}
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2012-02-28 19:55:05 +07:00
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if ((scancode & 0x80) != 0) {
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if (scancode == 0x9c)
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kbd_last_ret = 0;
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2010-05-21 09:04:24 +07:00
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return -1;
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2012-02-28 19:55:05 +07:00
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}
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2010-05-21 09:04:24 +07:00
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scancode &= 0x7f;
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/*
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* Translate scancode
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*/
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if (scancode == 0x3a) {
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/*
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* Toggle caps lock
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*/
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shift_lock ^= 1;
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#ifdef KDB_BLINK_LED
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kdb_toggleled(0x4);
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#endif
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return -1;
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}
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if (scancode == 0x0e) {
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/*
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* Backspace
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*/
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return 8;
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}
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/* Special Key */
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switch (scancode) {
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case 0xF: /* Tab */
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return 9;
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case 0x53: /* Del */
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return 4;
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case 0x47: /* Home */
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return 1;
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case 0x4F: /* End */
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return 5;
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case 0x4B: /* Left */
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return 2;
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case 0x48: /* Up */
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return 16;
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case 0x50: /* Down */
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return 14;
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case 0x4D: /* Right */
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return 6;
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}
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if (scancode == 0xe0)
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return -1;
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/*
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* For Japanese 86/106 keyboards
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* See comment in drivers/char/pc_keyb.c.
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* - Masahiro Adegawa
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*/
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if (scancode == 0x73)
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scancode = 0x59;
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else if (scancode == 0x7d)
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scancode = 0x7c;
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if (!shift_lock && !shift_key && !ctrl_key) {
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keychar = plain_map[scancode];
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} else if ((shift_lock || shift_key) && key_maps[1]) {
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keychar = key_maps[1][scancode];
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} else if (ctrl_key && key_maps[4]) {
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keychar = key_maps[4][scancode];
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} else {
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keychar = 0x0020;
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kdb_printf("Unknown state/scancode (%d)\n", scancode);
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}
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keychar &= 0x0fff;
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if (keychar == '\t')
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keychar = ' ';
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switch (KTYP(keychar)) {
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case KT_LETTER:
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case KT_LATIN:
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if (isprint(keychar))
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break; /* printable characters */
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2018-08-05 11:18:25 +07:00
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/* fall through */
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2010-05-21 09:04:24 +07:00
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case KT_SPEC:
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if (keychar == K_ENTER)
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break;
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2018-08-05 11:18:25 +07:00
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/* fall through */
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2010-05-21 09:04:24 +07:00
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default:
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return -1; /* ignore unprintables */
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}
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2012-02-28 19:55:05 +07:00
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if (scancode == 0x1c) {
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kbd_last_ret = 1;
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return 13;
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}
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return keychar & 0xff;
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}
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EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
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/*
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* Best effort cleanup of ENTER break codes on leaving KDB. Called on
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* exiting KDB, when we know we processed an ENTER or KP ENTER scan
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* code.
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*/
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void kdb_kbd_cleanup_state(void)
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{
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int scancode, scanstatus;
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/*
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* Nothing to clean up, since either
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* ENTER was never pressed, or has already
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* gotten cleaned up.
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*/
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if (!kbd_last_ret)
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return;
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kbd_last_ret = 0;
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/*
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* Enter key. Need to absorb the break code here, lest it gets
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* leaked out if we exit KDB as the result of processing 'g'.
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*
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* This has several interesting implications:
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* + Need to handle KP ENTER, which has break code 0xe0 0x9c.
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* + Need to handle repeat ENTER and repeat KP ENTER. Repeats
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* only get a break code at the end of the repeated
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* sequence. This means we can't propagate the repeated key
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* press, and must swallow it away.
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* + Need to handle possible PS/2 mouse input.
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* + Need to handle mashed keys.
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*/
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while (1) {
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2010-05-21 09:04:24 +07:00
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while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
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2012-02-28 19:55:05 +07:00
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cpu_relax();
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2010-05-21 09:04:24 +07:00
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/*
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2012-02-28 19:55:05 +07:00
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* Fetch the scancode.
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2010-05-21 09:04:24 +07:00
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*/
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scancode = inb(KBD_DATA_REG);
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scanstatus = inb(KBD_STATUS_REG);
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2012-02-28 19:55:05 +07:00
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/*
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* Skip mouse input.
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*/
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if (scanstatus & KBD_STAT_MOUSE_OBF)
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continue;
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2010-05-21 09:04:24 +07:00
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2012-02-28 19:55:05 +07:00
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/*
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* If we see 0xe0, this is either a break code for KP
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* ENTER, or a repeat make for KP ENTER. Either way,
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* since the second byte is equivalent to an ENTER,
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* skip the 0xe0 and try again.
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*
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* If we see 0x1c, this must be a repeat ENTER or KP
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* ENTER (and we swallowed 0xe0 before). Try again.
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*
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* We can also see make and break codes for other keys
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* mashed before or after pressing ENTER. Thus, if we
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* see anything other than 0x9c, we have to try again.
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*
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* Note, if you held some key as ENTER was depressed,
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* that break code would get leaked out.
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*/
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if (scancode != 0x9c)
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continue;
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2010-05-21 09:04:24 +07:00
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2012-02-28 19:55:05 +07:00
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return;
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2010-05-21 09:04:24 +07:00
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}
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}
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