BarinkOS/kernel/kernel.cpp

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/*
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"
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#include "pci/pci.h"
#include "drivers/pit/pit.h"
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#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 "acpi/acpi.h"
#include "memory/VirtualMemoryManager.h"
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extern BootInfoBlock* BIB;
extern "C" void LoadGlobalDescriptorTable();
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extern "C" void jump_usermode();
void initBootDrive(){
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);
}
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extern "C" void kernel ()
{
init_serial();
kterm_init();
setup_tss();
initGDT();
initidt();
LoadGlobalDescriptorTable();
flush_tss();
printf("Memory setup complete!\n");
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// Enable interrupts
asm volatile("STI");
initHeap();
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pit_initialise();
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ACPI::initialize();
PCI::Scan();
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processor::initialize();
processor::enable_protectedMode();
initBootDrive();
VirtualFileSystem::initialize();
#ifdef VFS_EXAMPLE
auto fontFile = VirtualFileSystem::open("/FONT PSF", 0);
if(grubcfg->flags == 0){
uint16_t* contents = (uint16_t*) malloc(sizeof(uint16_t) * 256);
grubcfg->read(grubcfg, contents, 512);
for(int i =0 ; i < grubcfg->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");
}
#endif
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#ifdef USERMODE_RELEASE
// Lets jump into user mode
jump_usermode();
#else
startSuperVisorTerminal();
#endif
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}