BlepOS/kernel.cpp at main · LeBlueAwoo/BlepOS · GitHub

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#include "types.h"
#include "gdt.h"
#include "interrupts.h"

void printf(char* str)
{
    uint16_t* VideoMemory = (uint16_t*)0xb8000;

    static uint8_t x=0, y=0;

    for(int i = 0; str[i] != '\0'; i++)
    {
        switch(str[i])
        {
            case '\n':
                y++;
                x=0;
                break;
            default:
                VideoMemory[80*y+x] = (VideoMemory[80*y+x] & 0xFF00) | str[i];
                x++;
                break;
        }


        if(x >= 80)
        {
            y++;
            x=0;
        }

        if(y >= 25)
        {
            for(y = 0; y < 25; y++)
            {
                for(x = 0; x < 80; x++)
                {
                    VideoMemory[80*y+x] = (VideoMemory[80*y+x] & 0xFF00) | ' ';
                }
            }
            x=0;
            y++;
        }
    }
}

typedef void (*constructor)();
extern "C" constructor* start_ctors;
extern "C" constructor* end_ctors;
extern "C" void callConstructors()
{
    for(constructor* i = start_ctors; i != end_ctors; i++)
        (*i)();
}

extern "C" void kernelMain(void* multiboot_structure, uint32_t magicnumber)
{
    printf("Blep OS 0.0.1\n");
    GlobalDescriptorTable gdt;
    InterruptManager interrupts(&gdt);

    interrupts.Activate();
    printf("Configured interrupts...");

    while(true);
}