mbr_asm/main.c

#include "exception.h"
#include "gdt.h"
#include "idt.h"
#include "interrupt.h"
#include "io.h"
#include "irq.h"
#include "pit.h"
#include "types.h"
#include "vga.h"

char getScancode()
{
    char c = 0;
    do {
        if (inb(0x60) != c) {
            c = inb(0x60);
            if (c > 0)
                return c;
        }
    } while (1);
}

void cpuid(int code, uint32_t *a, uint32_t *d)
{
    asm volatile("cpuid" : "=a"(*a), "=d"(*d) : "0"(code) : "ebx", "ecx");
}

void kmain()
{
    const short color = GREEN;
    clearScreen(BLACK);
    printString("Setting up IDT", color, BLACK, 0, 0);
    gdtSetup();
    idtSetup();
    printString("Setting up IRQ", color, BLACK, 0, 1);
    irqSetup();
    initPit(100);

    printString("Setting up IRQ handlers", color, BLACK, 0, 1);
    irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
    irqSetRoutine(IRQ_TIMER, timer_handler);
    printString("Enabling HW interrupts", color, BLACK, 0, 2);
    exceptionSetRoutine(EXCEPTION_DOUBLE_FAULT, print_handler);
    // Enabling the HW interrupts
    asm volatile("sti\n");
    int count = 0;
    while (1) {
        printInt(count++, color, BLACK, 0, 6);
    }
    printString("exiting", color, BLACK, 0, 4);
}