dcget.cc

Murphy 大俠 GPL 的 C++/x86 RTOS, 支持 MMU, 用戶/核心 模式區隔. http://hpc.ee.ntu.edu.tw/~murphy/me/EKernel.html

/* 
 * Copyright (c) 1995-1994 The University of Utah and
 * the Computer Systems Laboratory at the University of Utah (CSL).
 * All rights reserved.
 *
 * Permission to use, copy, modify and distribute this software is hereby
 * granted provided that (1) source code retains these copyright, permission,
 * and disclaimer notices, and (2) redistributions including binaries
 * reproduce the notices in supporting documentation, and (3) all advertising
 * materials mentioning features or use of this software display the following
 * acknowledgement: ``This product includes software developed by the
 * Computer Systems Laboratory at the University of Utah.''
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to [e-mail] any
 * improvements that they make and grant CSL redistribution rights.
 */

#include <flux/base_critical.h>
#include <flux/x86/pio.h>
#include <flux/x86/pc/direct_cons.h>
#include <flux/x86/pc/keyboard.h>

#define SHIFT -1

static char keymap[128][2] = {
	{0},			/* 0 */
	{27,	27},		/* 1 - ESC */
	{'1',	'!'},		/* 2 */
	{'2',	'@'},
	{'3',	'#'},
	{'4',	'$'},
	{'5',	'%'},
	{'6',	'^'},
	{'7',	'&'},
	{'8',	'*'},
	{'9',	'('},
	{'0',	')'},
	{'-',	'_'},
	{'=',	'+'},
	{8,	8},		/* 14 - Backspace */
	{'\t',	'\t'},		/* 15 */
	{'q',	'Q'},
	{'w',	'W'},
	{'e',	'E'},
	{'r',	'R'},
	{'t',	'T'},
	{'y',	'Y'},
	{'u',	'U'},
	{'i',	'I'},
	{'o',	'O'},
	{'p',	'P'},
	{'[',	'{'},
	{']',	'}'},		/* 27 */
	{'\r',	'\r'},		/* 28 - Enter */
	{0,	0},		/* 29 - Ctrl */
	{'a',	'A'},		/* 30 */
	{'s',	'S'},
	{'d',	'D'},
	{'f',	'F'},
	{'g',	'G'},
	{'h',	'H'},
	{'j',	'J'},
	{'k',	'K'},
	{'l',	'L'},
	{';',	':'},
	{'\'',	'"'},		/* 40 */
	{'`',	'~'},		/* 41 */
	{SHIFT,	SHIFT},		/* 42 - Left Shift */
	{'\\',	'|'},		/* 43 */
	{'z',	'Z'},		/* 44 */
	{'x',	'X'},
	{'c',	'C'},
	{'v',	'V'},
	{'b',	'B'},
	{'n',	'N'},
	{'m',	'M'},
	{',',	'<'},
	{'.',	'>'},
	{'/',	'?'},		/* 53 */
	{SHIFT,	SHIFT},		/* 54 - Right Shift */
	{0,	0},		/* 55 - Print Screen */
	{0,	0},		/* 56 - Alt */
	{' ',	' '},		/* 57 - Space bar */
	{0,	0},		/* 58 - Caps Lock */
	{0,	0},		/* 59 - F1 */
	{0,	0},		/* 60 - F2 */
	{0,	0},		/* 61 - F3 */
	{0,	0},		/* 62 - F4 */
	{0,	0},		/* 63 - F5 */
	{0,	0},		/* 64 - F6 */
	{0,	0},		/* 65 - F7 */
	{0,	0},		/* 66 - F8 */
	{0,	0},		/* 67 - F9 */
	{0,	0},		/* 68 - F10 */
	{0,	0},		/* 69 - Num Lock */
	{0,	0},		/* 70 - Scroll Lock */
	{'7',	'7'},		/* 71 - Numeric keypad 7 */
	{'8',	'8'},		/* 72 - Numeric keypad 8 */
	{'9',	'9'},		/* 73 - Numeric keypad 9 */
	{'-',	'-'},		/* 74 - Numeric keypad '-' */
	{'4',	'4'},		/* 75 - Numeric keypad 4 */
	{'5',	'5'},		/* 76 - Numeric keypad 5 */
	{'6',	'6'},		/* 77 - Numeric keypad 6 */
	{'+',	'+'},		/* 78 - Numeric keypad '+' */
	{'1',	'1'},		/* 79 - Numeric keypad 1 */
	{'2',	'2'},		/* 80 - Numeric keypad 2 */
	{'3',	'3'},		/* 81 - Numeric keypad 3 */
	{'0',	'0'},		/* 82 - Numeric keypad 0 */
	{'.',	'.'},		/* 83 - Numeric keypad '.' */
};

int
direct_cons_getchar(void)
{
	static unsigned shift_state;
	unsigned status, scan_code, ch;

	base_critical_enter();

	retry:

	/* Wait until a scan code is ready and read it. */
	do status = inb(0x64);
	while ((status & K_OBUF_FUL) == 0);
	scan_code = inb(0x60);

	/* Handle key releases - only release of SHIFT is important. */
	if (scan_code & 0x80) {
		scan_code &= 0x7f;
		if (keymap[scan_code][0] == SHIFT)
			shift_state = 0;
		goto retry;
	}

	/* Translate the character through the keymap. */
	ch = keymap[scan_code][shift_state];
	if (ch == SHIFT) {
		shift_state = 1;
		goto retry;
	} else if (ch == 0)
		goto retry;

	base_critical_leave();

	return ch;
}