keyboard.c
键盘驱动程序
#include "keyboard.h"
#include "../interrupt/trap.h"
#include "../vga/vga.h"
#include "../serial/serial.h"
/***** Keyboard input code *****/
#define NO 0
#define SHIFT (1<<0)
#define CTL (1<<1)
#define ALT (1<<2)
#define CAPSLOCK (1<<3)
#define NUMLOCK (1<<4)
#define SCROLLLOCK (1<<5)
#define E0ESC (1<<6)
unsigned int shift=0;
char shell_input=0; //shell输入字符，每次读取一个
//int shell_rpos=0; //shell输入缓冲区读偏移
//int shell_wpos=0; //shell输入缓冲区写偏移
//shiftcode[1D]=CTL,
static unsigned char shiftcode[256] = {
[0x1D] CTL,
[0x2A] SHIFT,
[0x36] SHIFT,
[0x38] ALT,
[0x9D] CTL,
[0xB8] ALT
};
static unsigned char togglecode[256] = {
[0x3A] CAPSLOCK,
[0x45] NUMLOCK,
[0x46] SCROLLLOCK
};
static unsigned char normalmap[256] = {
NO, 0x1B, '1', '2', '3', '4', '5', '6', // 0x00
'7', '8', '9', '0', '-', '=', '\b', '\t',
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', // 0x10
'o', 'p', '[', ']', '\n', NO, 'a', 's',
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', // 0x20
'\'', '`', NO, '\\', 'z', 'x', 'c', 'v',
'b', 'n', 'm', ',', '.', '/', NO, '*', // 0x30
NO, ' ', NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
'8', '9', '-', '4', '5', '6', '+', '1',
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
[0xC7] KEY_HOME, [0x9C] '\n' /*KP_Enter*/,
[0xB5] '/' /*KP_Div*/, [0xC8] KEY_UP,
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
[0xCD] KEY_RT, [0xCF] KEY_END,
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
static unsigned char shiftmap[256] = {
NO, 033, '!', '@', '#', '$', '%', '^', // 0x00
'&', '*', '(', ')', '_', '+', '\b', '\t',
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', // 0x10
'O', 'P', '{', '}', '\n', NO, 'A', 'S',
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', // 0x20
'"', '~', NO, '|', 'Z', 'X', 'C', 'V',
'B', 'N', 'M', '<', '>', '?', NO, '*', // 0x30
NO, ' ', NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
'8', '9', '-', '4', '5', '6', '+', '1',
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
[0xC7] KEY_HOME, [0x9C] '\n' /*KP_Enter*/,
[0xB5] '/' /*KP_Div*/, [0xC8] KEY_UP,
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
[0xCD] KEY_RT, [0xCF] KEY_END,
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
#define C(x) (x - '@')
static unsigned char ctlmap[256] = {
NO, NO, NO, NO, NO, NO, NO, NO,
NO, NO, NO, NO, NO, NO, NO, NO,
C('Q'), C('W'), C('E'), C('R'), C('T'), C('Y'), C('U'), C('I'),
C('O'), C('P'), NO, NO, '\r', NO, C('A'), C('S'),
C('D'), C('F'), C('G'), C('H'), C('J'), C('K'), C('L'), NO,
NO, NO, NO, C('\\'), C('Z'), C('X'), C('C'), C('V'),
C('B'), C('N'), C('M'), NO, NO, C('/'), NO, NO,
[0x97] KEY_HOME,
[0xB5] C('/'), [0xC8] KEY_UP,
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
[0xCD] KEY_RT, [0xCF] KEY_END,
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
[0xD2] KEY_INS, [0xD3] KEY_DEL
};
static unsigned char *charcode[4] = {
normalmap,
shiftmap,
ctlmap,
ctlmap
};
/* *
* kbd_proc_data - get data from keyboard
*
* The kbd_proc_data() function gets data from the keyboard.
* If we finish a character, return it, else 0. And return -1 if no data.
* */
int kbd_proc_data(void) {
int c;
unsigned char data;
//static unsigned int shift=0;
if ((inb(KBSTATP) & KBS_DIB) == 0) {
return -1;
}
data = inb(KBDATAP);
if (data == 0xE0) {
// E0 escape character
shift |= E0ESC;
return 0;
} else if (data & 0x80) {
// Key released
data = (shift & E0ESC ? data : data & 0x7F);
shift &= ~(shiftcode[data] | E0ESC);
return 0;
} else if (shift & E0ESC) {
// Last character was an E0 escape; or with 0x80
data |= 0x80;
shift &= ~E0ESC;
}
shift |= shiftcode[data];
shift ^= togglecode[data];
c = charcode[shift & (CTL | SHIFT)][data];
if (shift & CAPSLOCK) {
if ('a' <= c && c <= 'z')
c += 'A' - 'a';
else if ('A' <= c && c <= 'Z')
c += 'a' - 'A';
}
//backspace
//if (c=='\b'){
//backtrace();
// return '\b';
//}
// Process special keys
// Ctrl-Alt-Del: reboot
if (!(~shift & (CTL | ALT)) && c == KEY_DEL) {
printk("Rebooting!\b");
outb(0x92, 0x3); // courtesy of Chris Frost
}
return c;
}
/* kbd_intr - try to feed input characters from keyboard */
void kbd_intr(void) {
cons_intr(kbd_proc_data);
}
void kbd_init(void) {
cons.rpos=0;
cons.wpos=0;
for(int i=0;i<CONSBUFSIZE;i++)
{
cons.buf[i]=0;
}
shell_input=0;
// drain the kbd buffer
shift=0;
kbd_intr();
pic_enable(IRQ_KBD);
}
Keyboard.h
#ifndef _KEYBOARD_H_
#define _KEYBOARD_H_
// Special keycodes
#define KEY_HOME 0xE0
#define KEY_END 0xE1
#define KEY_UP 0xE2
#define KEY_DN 0xE3
#define KEY_LF 0xE4
#define KEY_RT 0xE5
#define KEY_PGUP 0xE6
#define KEY_PGDN 0xE7
#define KEY_INS 0xE8
#define KEY_DEL 0xE9
/* This is i8042reg.h + kbdreg.h from NetBSD. */
#define KBSTATP 0x64 // kbd controller status port(I)
#define KBS_DIB 0x01 // kbd data in buffer
#define KBS_IBF 0x02 // kbd input buffer low
#define KBS_WARM 0x04 // kbd input buffer low
#define BS_OCMD 0x08 // kbd output buffer has command
#define KBS_NOSEC 0x10 // kbd security lock not engaged
#define KBS_TERR 0x20 // kbd transmission error
#define KBS_RERR 0x40 // kbd receive error
#define KBS_PERR 0x80 // kbd parity error
#define KBCMDP 0x64 // kbd controller port(O)
#define KBC_RAMREAD 0x20 // read from RAM
#define KBC_RAMWRITE 0x60 // write to RAM
#define KBC_AUXDISABLE 0xa7 // disable auxiliary port
#define KBC_AUXENABLE 0xa8 // enable auxiliary port
#define KBC_AUXTEST 0xa9 // test auxiliary port
#define KBC_KBDECHO 0xd2 // echo to keyboard port
#define KBC_AUXECHO 0xd3 // echo to auxiliary port
#define KBC_AUXWRITE 0xd4 // write to auxiliary port
#define KBC_SELFTEST 0xaa // start self-test
#define KBC_KBDTEST 0xab // test keyboard port
#define KBC_KBDDISABLE 0xad // disable keyboard port
#define KBC_KBDENABLE 0xae // enable keyboard port
#define KBC_PULSE0 0xfe // pulse output bit 0
#define KBC_PULSE1 0xfd // pulse output bit 1
#define KBC_PULSE2 0xfb // pulse output bit 2
#define KBC_PULSE3 0xf7 // pulse output bit 3
#define KBDATAP 0x60 // kbd data port(I)
#define KBOUTP 0x60 // kbd data port(O)
#define K_RDCMDBYTE 0x20
#define K_LDCMDBYTE 0x60
#define KC8_TRANS 0x40 // convert to old scan codes
#define KC8_MDISABLE 0x20 // disable mouse
#define KC8_KDISABLE 0x10 // disable keyboard
#define KC8_IGNSEC 0x08 // ignore security lock
#define KC8_CPU 0x04 // exit from protected mode reset
#define KC8_MENABLE 0x02 // enable mouse interrupt
#define KC8_KENABLE 0x01 // enable keyboard interrupt
#define CMDBYTE (KC8_TRANS|KC8_CPU|KC8_MENABLE|KC8_KENABLE)
/* keyboard commands */
#define KBC_RESET 0xFF // reset the keyboard
#define KBC_RESEND 0xFE // request the keyboard resend the last byte
#define KBC_SETDEFAULT 0xF6 // resets keyboard to its power-on defaults
#define KBC_DISABLE 0xF5 // as per KBC_SETDEFAULT, but also disable key scanning
#define KBC_ENABLE 0xF4 // enable key scanning
#define KBC_TYPEMATIC 0xF3 // set typematic rate and delay
#define KBC_SETTABLE 0xF0 // set scancode translation table
#define KBC_MODEIND 0xED // set mode indicators(i.e. LEDs)
#define KBC_ECHO 0xEE // request an echo from the keyboard
/* keyboard responses */
#define KBR_EXTENDED 0xE0 // extended key sequence
#define KBR_RESEND 0xFE // needs resend of command
#define KBR_ACK 0xFA // received a valid command
#define KBR_OVERRUN 0x00 // flooded
#define KBR_FAILURE 0xFD // diagnosic failure
#define KBR_BREAK 0xF0 // break code prefix - sent on key release
#define KBR_RSTDONE 0xAA // reset complete
#define KBR_ECHO 0xEE // echo response
int kbd_proc_data(void);
void kbd_intr(void);
void kbd_init(void);
#endif
键盘驱动还是有点复杂的，话不多说，直接看图，自己理解，看完下面的原理，再对着代码看一看应该就OK了，驱动了解一下就行。