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keyboard.c
401 lines (400 loc) · 8.59 KB
/
keyboard.c
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/*
#### ## ## ## ## ## ##
## ## ### ### ### ### ### ###
## ## #### #### #### #### #### ####
## ## ## ## ## ## ## ## ## ## ## ## ##
## ### ###### ## #### ## ## #### ## ######
## ## ## ## ## ### ## ## ### ## ## ##
########## ## ## ## ## ## ## ## ## ## ##
*/
// this is a keyboard driver for both PS/2 and USB keyboards
#include "gamma.h"
#include <stdbool.h>
static void(*kbdhandler)(char)=0;
// PS/2 Data port: 0x60, command port: 0x64
struct {
int ctrldown : 1; // done
int shiftdown: 1; // done
int arrowstat: 3; // 0: none 1: up 2: down 3: left 4: right, not implemented
int metadown : 1; // done
int escdown : 1; // done
int recievede0:1; // did we just get 0xE0?
int numlock : 1; // num lock on?
int capslock : 1; // caps lock on?
int scrlock : 1; // scroll lock?
} modkeystatus; // keep track of modifier keys (ctrl, shift, etc)
static byte ledstatus=0; // keep track of LEDs
void register_keyboard_handler(void(*fnPtr)(char))
{
kbdhandler=fnPtr;
}
void *get_keyboard_handler()
{
return kbdhandler;
}
void set_leds(int num, int caps, int scroll)
{
ledstatus=scroll | (num << 1) | (caps << 2);
outb(0x60, 0xED);
outb(0x60, ledstatus);
modkeystatus.numlock=num;
modkeystatus.capslock=caps;
modkeystatus.scrlock=scroll;
}
inline static int get_num_lock(void)
{
return ((ledstatus & 0x2) >> 1);
}
inline static int get_caps_lock(void)
{
return ((ledstatus & 0x4) >> 2);
}
inline static int get_scroll_lock(void)
{
return (ledstatus & 1);
}
static const char number_shift_lookup[10] = {'!', '@', '#', '$', '%', '^', '&', '*', '(', ')'}; // array of number keys + shift
static char ps2_qwerty_autogen(byte scancode) // process the scancode if it is A-Z
{
char c=0;
switch(scancode)
{
case 0x1E:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='A';
else
c='a';
break;
case 0x30:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='B';
else
c='b';
break;
case 0x2E:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='C';
else
c='c';
break;
case 0x20:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='D';
else
c='d';
break;
case 0x12:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='E';
else
c='e';
break;
case 0x21:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='F';
else
c='f';
break;
case 0x22:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='G';
else
c='g';
break;
case 0x23:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='H';
else
c='h';
break;
case 0x17:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='I';
else
c='i';
break;
case 0x24:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='J';
else
c='j';
break;
case 0x25:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='K';
else
c='k';
break;
case 0x26:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='L';
else
c='l';
break;
case 0x32:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='M';
else
c='m';
break;
case 0x31:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='N';
else
c='n';
break;
case 0x18:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='O';
else
c='o';
break;
case 0x19:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='P';
else
c='p';
break;
case 0x10:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='Q';
else
c='q';
break;
case 0x13:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='R';
else
c='r';
break;
case 0x1F:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='S';
else
c='s';
break;
case 0x14:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='T';
else
c='t';
break;
case 0x16:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='U';
else
c='u';
break;
case 0x2F:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='V';
else
c='v';
break;
case 0x11:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='W';
else
c='w';
break;
case 0x2D:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='X';
else
c='x';
break;
case 0x15:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='Y';
else
c='y';
break;
case 0x2C:
if(modkeystatus.shiftdown || modkeystatus.capslock)
c='Z';
else
c='z';
break;
case 0x1C: // enter down
c='\n';
break;
case 0x39: // space down
c=' ';
break;
case 0x0E: // bksp down
c='\b';
break;;
default:
c=0;
break;
}
switch(scancode)
{
case 0x53: // delete down
if(modkeystatus.metadown && modkeystatus.ctrldown) // is it CTRL-ALT-DEL?
{
ctrlaltdel();
}
return 127;
case 0x1A: // left bracket
if(modkeystatus.shiftdown)
c='{';
else
c='[';
break;
case 0x1B: // right bracket
if(modkeystatus.shiftdown)
c='}';
else
c=']';
break;
case 0x27: // semicolon
if(modkeystatus.shiftdown)
c=':';
else
c=';';
break;
case 0x28: // single quote
if(modkeystatus.shiftdown)
c='"';
else
c='\'';
break;
case 0x29: // tilde, backtick
if(modkeystatus.shiftdown)
c='~';
else
c='`';
break;
case 0x2B: // backslash
if(modkeystatus.shiftdown)
c='|';
else
c='\\';
break;
case 0x33: // comma
if(modkeystatus.shiftdown)
c='<';
else
c=',';
break;
case 0x34: // period
if(modkeystatus.shiftdown)
c='>';
else
c='.';
break;
case 0x35: // forward slash
if(modkeystatus.shiftdown)
c='?';
else
c='/';
break;
case 0x0C: // hyphen
if(modkeystatus.shiftdown)
c='_';
else
c='-';
break;
case 0x0D: // equal sign
if(modkeystatus.shiftdown)
c='+';
else
c='=';
break;
case 0x0F:
// tab
c='\t';
break;
case 0xC5: // num lock up
set_leds(!(get_num_lock()&1), get_caps_lock(), get_scroll_lock());
break;
case 0xBA: // caps lock up
set_leds(get_num_lock(), !(get_caps_lock()&1), get_scroll_lock());
break;
case 0xC6:
set_leds(get_num_lock(), get_caps_lock(), !(get_scroll_lock()&1));
break;
}
if(scancode >=2 && scancode <=11) // number
{
if(modkeystatus.shiftdown)
c=number_shift_lookup[scancode-2];
else
c=scancode!=11? dtoc(scancode-1) : '0';
}
if(c!=0)
{
term_put_keyboard_char(c);
if(kbdhandler)
{
kbdhandler(c);
}
return c;
}
return 0;
}
static void ps2_process_key(byte scancode) // top level QWERTY PS/2 decoder
{
// up code for any down code is down code + 0x80
switch(scancode) // handle modifier keys
{
case 0x01: // esc
modkeystatus.escdown=1;
return;
case 0x81: // esc up
modkeystatus.escdown=0;
return;
case 0x2A: case 0x36:
if(!modkeystatus.capslock) // shift down
modkeystatus.shiftdown=1;
else
modkeystatus.shiftdown=modkeystatus.shiftdown+1;
break;
case 0xAA: case 0xB6: // shift up
if(!modkeystatus.capslock)
modkeystatus.shiftdown=0;
else
modkeystatus.shiftdown=modkeystatus.shiftdown+1;
break;
case 0x1D: // left ctrl.
if(modkeystatus.recievede0) // right ctrl.
modkeystatus.recievede0=0;
modkeystatus.ctrldown=1;
return;
case 0x9D: // ctrl up
if(modkeystatus.recievede0)
modkeystatus.recievede0=0;
modkeystatus.ctrldown=0;
return;
case 0x38: // left alt
if(modkeystatus.recievede0)
modkeystatus.recievede0=0;
modkeystatus.metadown=1;
return;
case 0xB8: // alt up
if(modkeystatus.recievede0)
modkeystatus.recievede0=0;
modkeystatus.metadown=0;
return;
case 0xE0:
modkeystatus.recievede0=1;
return;
}
// not a modifier
if(ps2_qwerty_autogen(scancode))
return;
}
void ps2_interrupt(registers_t regs)
{
byte scancode=inb(0x60); // read the scancode
ps2_process_key(scancode); // process the scancode
}
void init_ps2()
{
memset(&modkeystatus, 0, sizeof(modkeystatus));
register_handler(33, &ps2_interrupt);
outb(0x60, 0xF0);
outb(0x60, 1); // set to scan code set 1
set_leds(0, 0, 0); // get the LEDs in a known state
}