YoutubeOS/IDT.cpp at master · omarbackup/YoutubeOS · GitHub

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#pragma once
#include "Typedefs.cpp"
#include "KBScanCodeSet1.cpp"
#include "IO.cpp"
#include "TextPrint.cpp"

struct IDT64{
  uint_16 offset_low;
  uint_16 selector;
  uint_8 ist;
  uint_8 types_attr;
  uint_16 offset_mid;
  uint_32 offset_high;
  uint_32 zero;
};

extern IDT64 _idt[256];
extern uint_64 isr1;
extern "C" void LoadIDT();

void InitializeIDT(){

	_idt[1].zero = 0;
	_idt[1].offset_low = (uint_16)(((uint_64)&isr1 & 0x000000000000ffff));
	_idt[1].offset_mid = (uint_16)(((uint_64)&isr1 & 0x00000000ffff0000) >> 16);
	_idt[1].offset_high = (uint_32)(((uint_64)&isr1 & 0xffffffff00000000) >> 32);
	_idt[1].ist = 0;
	_idt[1].selector = 0x08;
	_idt[1].types_attr = 0x8e;

	RemapPic();

	outb(0x21, 0xfd);
	outb(0xa1, 0xff);
	LoadIDT();
}

void(*MainKeyboardHandler)(uint_8 scanCode, uint_8 chr);

extern "C" void isr1_handler(){
	uint_8 scanCode = inb(0x60);
	uint_8 chr = 0;

	if (scanCode < 0x3A){
		chr = KBSet1::ScanCodeLookupTable[scanCode];
	}
	if (MainKeyboardHandler != 0) {
		MainKeyboardHandler(scanCode, chr);
	}
	outb(0x20, 0x20);
	outb(0xa0, 0x20);
}