src/main.c


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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <crt0.h>

#include <conio.h>

#include "timer.h"
#include "vga.h"
#include "data.h"

/* disable paging because our int handlers are written in C */
int _crt0_startup_flags = _CRT0_FLAG_LOCK_MEMORY;

int main(int argc, char *argv[])
{
    timer_init();
    atexit(timer_free);

    /* set VGA 320x200, 256 col */
    set_mode(0x13);

    set_palette(binary_palette_start);

    uint8_t *screen = open_framebuffer();
    if (!screen)
    {
        fprintf(stderr, "ERROR: failed to open the framebuffer\n");
        return 1;
    }

    for (int i = 0; i < 16; i++)
    {
        wait_vsync();
        memset(screen, i, 320 * 200);
        getch();
    }

    printf("Hello DOS!\n");

    getch();

    set_mode(3);
    close_framebuffer();

    printf("tick is %li\n", ticks);

    return 0;
}