Nigel/BarinkOS
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Merge into main the new state of the operating system/kernel #1

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Nigel wants to merge 120 commits from dev into main
pull from: dev
merge into: Nigel:main
Conversation 0 Commits 120 Files Changed 146 +67 -80
8 changed files with 67 additions and 80 deletions
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Showing only changes of commit 37542b736f - Show all commits

4
Makefile
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@ -5,7 +5,7 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
CPP = ${HOME}/opt/cross/bin/i686-elf-g++
CFLAGS = -ffreestanding -Og -ggdb -Wall -Wextra
OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o $(BUILD_DIR)/paging.o $(BUILD_DIR)/VFS.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/time.o $(BUILD_DIR)/keyboard.o $(BUILD_DIR)/io.o $(BUILD_DIR)/processor.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o $(BUILD_DIR)/prekernel.o $(BUILD_DIR)/cpu.o $(BUILD_DIR)/KHeap.o $(BUILD_DIR)/pci.o $(BUILD_DIR)/pcidevice.o $(BUILD_DIR)/atapiDevice.o $(BUILD_DIR)/ataDevice.o $(BUILD_DIR)/rsdp.o $(BUILD_DIR)/acpi.o
OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o $(BUILD_DIR)/paging.o $(BUILD_DIR)/VFS.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/time.o $(BUILD_DIR)/keyboard.o $(BUILD_DIR)/io.o $(BUILD_DIR)/processor.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o $(BUILD_DIR)/prekernel.o $(BUILD_DIR)/KHeap.o $(BUILD_DIR)/pci.o $(BUILD_DIR)/pcidevice.o $(BUILD_DIR)/atapiDevice.o $(BUILD_DIR)/ataDevice.o $(BUILD_DIR)/rsdp.o $(BUILD_DIR)/acpi.o
SRC_DIR = source
BUILD_DIR = build
@ -133,8 +133,6 @@ $(BUILD_DIR)/KHeap.o:
$(BUILD_DIR)/prekernel.o:
$(CPP) -c $(SRC_DIR)/kernel/prekernel/prekernel.cpp -o $(BUILD_DIR)/prekernel.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/cpu.o:
$(CPP) -c $(SRC_DIR)/kernel/cpu.cpp -o $(BUILD_DIR)/cpu.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/processor.o:
$(CPP) -c $(SRC_DIR)/kernel/i386/processor.cpp -o $(BUILD_DIR)/processor.o $(CFLAGS) -fno-exceptions -fno-rtti

39
source/kernel/cpu.cpp
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@ -1,39 +0,0 @@
#include "cpu.h"
uint32_t GetEFLAGS()
{
uint32_t EFLAGS = 0;
asm volatile ("pushfl;" "movl 4(%%esp), %%edx" : "=d"(EFLAGS));
return EFLAGS;
}
uint32_t GetCR0()
{
uint32_t cr0_value;
asm volatile ("movl %%cr0, %%edx" : "=d"(cr0_value));
return cr0_value;
}
uint32_t GetCR2(){
uint32_t cr2_value;
__asm__ volatile("movl %%cr2, %%edx": "=d"(cr2_value));
return cr2_value;
}
uint32_t GetCR3(){
uint32_t cr3_value;
__asm__ volatile("movl %%cr3, %%edx": "=d"(cr3_value));
return cr3_value;
}
uint32_t GetCR4(){
uint32_t cr4_value;
__asm__ volatile("movl %%cr4, %%edx": "=d"(cr4_value));
return cr4_value;
}

16
source/kernel/cpu.h
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@ -1,16 +0,0 @@
#pragma once
#include <stdint.h>
uint32_t GetEFLAGS();
uint32_t GetCR0();
uint32_t GetCR2();
uint32_t GetCR3();
uint32_t GetCR4();

54
source/kernel/i386/processor.cpp
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@ -71,3 +71,57 @@ bool processor::hasPageSupport(){
bool processor::gigabytePages() {
return cap_page & (0x1 << 26);
}
void processor::enable_protectedMode()
{
// Set the protected bit of control register 0
// this will put the CPU into protected mode
// NOTE: This should really be an 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
asm volatile("mov %cr0, %eax ");
asm volatile("or $1, %eax");
asm volatile("mov %eax, %cr0");
}
uint32_t processor::GetEFLAGS()
{
uint32_t EFLAGS = 0;
asm volatile ("pushfl;" "movl 4(%%esp), %%edx" : "=d"(EFLAGS));
return EFLAGS;
}
uint32_t processor::GetCR0()
{
uint32_t cr0_value;
asm volatile ("movl %%cr0, %%edx" : "=d"(cr0_value));
return cr0_value;
}
uint32_t processor::GetCR2(){
uint32_t cr2_value;
__asm__ volatile("movl %%cr2, %%edx": "=d"(cr2_value));
return cr2_value;
}
uint32_t processor::GetCR3(){
uint32_t cr3_value;
__asm__ volatile("movl %%cr3, %%edx": "=d"(cr3_value));
return cr3_value;
}
uint32_t processor::GetCR4(){
uint32_t cr4_value;
__asm__ volatile("movl %%cr4, %%edx": "=d"(cr4_value));
return cr4_value;
}

7
source/kernel/i386/processor.h
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@ -19,6 +19,13 @@ public:
static bool gigabytePages();
static bool hasPAEExtension();
static void enable_protectedMode();
static uint32_t GetEFLAGS();
static uint32_t GetCR0();
static uint32_t GetCR2();
static uint32_t GetCR3();
static uint32_t GetCR4();
private:
static uint32_t cap_page;

4
source/kernel/interrupts/idt.cpp
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@ -1,7 +1,7 @@
#include "idt.h"
#include "../drivers/pit/pit.h"
#include "../drivers/ps-2/keyboard.h"
#include "../cpu.h"
#include "../i386/processor.h"
#include "../memory/VirtualMemoryManager.h"
IDT_entry idt_table[256];
IDT_ptr idt_ptr;
@ -165,7 +165,7 @@ void irs_handler (registers* regs) {
// Page Fault Exception #PF
printf("#PF\n");
#define ALIGN(addr, align) (((addr) & ~((align) - 1)) + (align))
FaultingAddress = GetCR2();
FaultingAddress = processor::GetCR2();
printf("Accessing the linear address 0x%x resulted in a page fault!\n\n", FaultingAddress);

21
source/kernel/kernel.cpp
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@ -23,22 +23,6 @@ extern "C"{
extern "C" void LoadGlobalDescriptorTable();
extern "C" void jump_usermode();
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
asm volatile("mov %cr0, %eax ");
asm volatile("or $1, %eax");
asm volatile("mov %eax, %cr0");
}
extern "C" void kernel ()
{
@ -60,11 +44,10 @@ extern "C" void kernel ()
// ACPI::initialize(); // FIXME: improper reading of bios memory
PCI::Scan();
processor::initialize();
processor::enable_protectedMode();
FileSystem::initialize();
printf("Enable Protected mode and jump to kernel main\n");
set_protected_bit();
#ifdef USERMODE_RELEASE
// Lets jump into user mode

2
source/kernel/memory/VirtualMemoryManager.h
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@ -1,6 +1,6 @@
#pragma once
#include "../terminal/kterm.h"
#include "../cpu.h"
#include "../i386/processor.h"
#include "PhysicalMemoryManager.h"