BarinkOS/kernel/kernel.cpp

/*
    Copyright © Nigel Barink 2023
*/
#include "memory/memory.h"
#include "memory/KernelHeap.h"
#include "memory/gdt/gdtc.h"
#include "memory/TaskStateSegment.h"
#include "supervisorterminal/superVisorTerminal.h"
#include "drivers/vga/VBE.h"
#include "pci/pci.h"
#include "drivers/pit/pit.h"
#include "acpi/acpi.h"
#include "i386/processor.h"
#include "terminal/kterm.h"
#include "interrupts/idt.h"
#include "serial.h"
#include "storage/vfs/vfs.h"
#include "storage/filesystems/FAT/FAT.h"
#include "../CoreLib/Memory.h"


extern "C"  void LoadGlobalDescriptorTable();
extern "C" void jump_usermode();
extern BootInfoBlock* BIB;

extern "C" void kernel ()
{

    init_serial();
    kterm_init();

    setup_tss();
    initGDT();
    initidt();
    LoadGlobalDescriptorTable();
    flush_tss();
    printf("Memory setup complete!\n");

    // Enable interrupts
    asm volatile("STI");

    initHeap();
    pit_initialise();
    ACPI::initialize();

    PCI::Scan();
    processor::initialize();
    processor::enable_protectedMode();
    printf("Boot device: 0x%x\n", BIB->bootDeviceID);
    unsigned int part3 = BIB->bootDeviceID & 0xFF;
    unsigned int part2 = (BIB->bootDeviceID & 0xFF00) >> 8;
    unsigned int part1 = (BIB->bootDeviceID & 0xFF0000) >> 16;
    unsigned int drive = (BIB->bootDeviceID & 0xFF000000) >> 24;
    if (drive == 0x80 )
        printf("booted from disk!\n");
    if(drive == 0x00)
        printf("booted from floppy disk\n");

    printf("Part1: %d, Part2: %d, Part3: %d\n", part1, part2 , part3);
    ATAPIO::Identify(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER);

    VirtualFileSystem::initialize();

    printf("Lets open hello.txt\n");
    auto fontFile = VirtualFileSystem::open("/HELLO   TXT", 0);
    if(fontFile->flags == 0){
        uint16_t* contents = (uint16_t*) malloc(sizeof(uint16_t) * 256);
        fontFile->read(fontFile, contents, 512);

       for(int i =0 ; i < fontFile->root->size; i++ ){
            kterm_put(contents[i] & 0x00ff);
            kterm_put(contents[i] >> 8);
        }
        kterm_put('\n');
        free((void*)contents);
    }else{
        printf("Could not find file\n");
    }



#ifdef USERMODE_RELEASE
    // Lets jump into user mode
    jump_usermode();
#else
    startSuperVisorTerminal();
#endif

}