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

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Cursor-related functions                                      //
//                                                                            //
//                                                                            //
//  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 <init/boot.h>
#include <io/cursor.h>

static int _curX = 0, _curY = 0;

void IoEnableCursor(void)
{
    IoWriteByteOnPort(0x3D4, 0xA);
    IoWriteByteOnPort(0x3D5, (IoReadByteFromPort(0x3D5) & 0xC0) | 14);
    
    IoWriteByteOnPort(0x3D4, 0xB);
    IoWriteByteOnPort(0x3D5, (IoReadByteFromPort(0x3D5) & 0xE0) | 15);
}

void IoDisableCursor(void)
{
	IoWriteByteOnPort(0x3D4, 0x0A);
	IoWriteByteOnPort(0x3D5, 0x20);
}

void IoUpdateCursor(int x, int y)
{
    _curX = x;
    _curY = y;

	const ushort pos = y * BtVideoInfo.framebufferWidth + x;
 
	IoWriteByteOnPort(0x3D4, 0x0F);
	IoWriteByteOnPort(0x3D5, (pos & 0xFF));
	IoWriteByteOnPort(0x3D4, 0x0E);
	IoWriteByteOnPort(0x3D5, ((pos >> 8) & 0xFF));
}

int IoGetCursorX(void) { return _curX; }
int IoGetCursorY(void) { return _curY; }