BarinkOS/source/kernel/kernel.cpp

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/*
Copyright © Nigel Barink 2023
*/
extern "C"{
#include "../lib/include/string.h"
}
#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 "drivers/pci/pci.h"
#include "drivers/pit/pit.h"
#include "drivers/acpi/acpi.h"
#include "drivers/ide/ide.h"
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#include "i386/processor.h"
#include "terminal/kterm.h"
#include "interrupts/idt.h"
#include "serial.h"
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extern "C" void LoadGlobalDescriptorTable();
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extern "C" void jump_usermode();
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void set_protected_bit()
{
// Set the protected bit of control register 0
// this will put the CPU into protected mode
// NOTE: This should really be a assembly procedure
// We cant directly write to control register 0
// therefor we copy the value of control register 0 into eax
// once we are done manipulating the value we write the value in
// eax back to control register 0
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asm volatile("mov %cr0, %eax ");
asm volatile("or $1, %eax");
asm volatile("mov %eax, %cr0");
}
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extern "C" void kernel ()
{
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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");
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initHeap();
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pit_initialise();
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// ACPI::initialize();
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PCI::Scan();
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//TestIDEController();
processor::initialize();
printf("Enable Protected mode and jump to kernel main\n");
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set_protected_bit();
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#ifdef USERMODE_RELEASE
// Lets jump into user mode
jump_usermode();
#else
startSuperVisorTerminal();
#endif
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}