os-k/kaleid/kernel/io/keyb.c

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:  Basic Read Only Keyboard Driver                                    //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K is free software: you can redistribute it and/or modify              //
//  it under the terms of the GNU General Public License as published by      //
//  the Free Software Foundation, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K is distributed in the hope that it will be useful,                   //
//  but WITHOUT ANY WARRANTY//without even the implied warranty of            //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
//  GNU General Public License for more details.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#include <kernel/base.h>
#include <kernel/iomisc.h>

extern void KeybIsr(void);
extern void IdtRegisterIrq(void (*isr)(void), uchar irq, uchar flags);
extern void SendEOItoPIC(void);

void IoSetupKeyb(void)
{
    IdtRegisterIrq(KeybIsr, 0x21, 0x8E);
}


uchar KeybHandler(void)
{
    char status;
    char code = 0;

    // write EOI
    IoWriteByteOnPort(0x20, 0x20);

    status = IoReadByteFromPort(0x64);

    if (status & 0x01) {
        code = IoReadByteFromPort(0x60);

        if(code < 0) code = 0;
    }

    return code;
}