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Commit 9e7be1d

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Arun007coderArun007coder
committed
* Initial commit
* Created a basic kernel 'arthur' * Implemented basic textmode driver * Implemented basic debug functions * Implemented functions for communicating through port I/O * Ported printf implementation
0 parents  commit 9e7be1d

18 files changed

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‎.gitignore‎

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*.elf
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**/*.o
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*.iso
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.vscode

‎Makefile‎

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SYSROOT=~/sysroot/
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ROOTDIR=$(shell pwd)
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SRCDIR=$(ROOTDIR)/src
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INCDIR=$(SRCDIR)/include
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GRUBDIR=~/sysroot/grub/
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CC=$(SYSROOT)/bin/i686-elf-gcc
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CFLAGS=
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KCFLAGS= -I$(INCDIR) -fno-builtin -fno-leading-underscore -ffreestanding -Wall -O2 -nostdlib $(CFLAGS)
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LD=$(SYSROOT)/bin/i686-elf-ld
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LINKERSCRIPT=$(SRCDIR)/boot/link.ld
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LIBGCC_PATH=$(shell $(CC) -print-libgcc-file-name)
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LDFLAGS= -T$(LINKERSCRIPT)
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AS=$(SYSROOT)/bin/i686-elf-as
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ASFLAGS=
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NASM=nasm
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NASMFLAGS=-f elf32 -g -F dwarf -O2 -w+zeroing
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OBJCOPY=$(SYSROOT)/bin/i686-elf-objcopy
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OBJDUMP=$(SYSROOT)/bin/i686-elf-objdump
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QEMU=qemu-system-i386
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QEMUFLAGS=-cdrom $(ISOFILE) -m 512M -boot d
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QEMUDFLAGS=-s -S -daemonize
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KERNEL_NAME=arthur
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OS_NAME=SectorOS
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KERNEL_IMAGE=$(KERNEL_NAME).elf
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ISOFILE=$(OS_NAME).iso
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OBJECTS= $(SRCDIR)/boot/multiboot2.o \
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$(SRCDIR)/boot/boot.o \
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$(SRCDIR)/kernel/kernel.o \
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$(SRCDIR)/common/debug.o \
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$(SRCDIR)/common/printf.o \
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$(SRCDIR)/drivers/io/ports.o \
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$(SRCDIR)/drivers/video/textmode.o
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kernel : $(KERNEL_IMAGE)
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iso : $(ISOFILE)
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$(KERNEL_IMAGE) : $(OBJECTS)
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@echo "[LD] $@"
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@$(LD) $(LDFLAGS) -o $@ $(OBJECTS) $(LIBGCC_PATH)
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$(ISOFILE) : $(KERNEL_IMAGE)
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@echo '[GRUB] $@'
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@mkdir -p $(OS_NAME)/boot/grub
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@cp $(ROOTDIR)/docs/grub.cfg $(OS_NAME)/boot/grub/grub.cfg
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@cp $(KERNEL_IMAGE) $(OS_NAME)/boot/
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@$(GRUBDIR)bin/grub-mkrescue -o $(ISOFILE) $(OS_NAME) --product-name=$(OS_NAME)
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@rm -rf $(OS_NAME)
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%.o : %.c
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@echo '[CC] $@'
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@$(CC) $(KCFLAGS) -c -o $@ $<
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%.o : %.s
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@echo '[AS] $@'
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@$(AS) $(ASFLAGS) -o $@ $<
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%.o : %.asm
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@echo '[NASM] $@'
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@$(NASM) $(NASMFLAGS) -o $@ $<
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run : $(ISOFILE)
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@echo '[QEMU] Running OS...'
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@$(QEMU) $(QEMUFLAGS) -serial stdio
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PHONY: clean
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clean:
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@echo 'Cleaning the source directory...'
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@rm -f $(OBJECTS) $(KERNEL_IMAGE) $(ISOFILE)

‎docs/README.md‎

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# SectorOS Project
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SectorOS is a 32bit operating system.

‎docs/grub.cfg‎

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set timeout=3
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set default=0
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set root=(cd)
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menuentry "SectorOS" {
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multiboot2 /boot/arthur.elf
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boot
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}

‎src/boot/boot.asm‎

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section .initial_stack, nobits
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align 4
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__KERNEL_STACK_BOTTOM:
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resb 104856
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__KERNEL_STACK_TOP:
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section .text
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global __KERNEL_BOOTSTRAP
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extern kernelMain
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__KERNEL_BOOTSTRAP:
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mov esp,__KERNEL_STACK_TOP
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push eax
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push ebx
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call kernelMain
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__KERNEL_EXECUTION_STOP:
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cli
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hlt
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jmp __KERNEL_EXECUTION_STOP

‎src/boot/link.ld‎

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ENTRY(__KERNEL_BOOTSTRAP)
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SECTIONS
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{
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. = 2M;
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.multiboot2 BLOCK(4K) : ALIGN(4K)
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{
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*(.multiboot2)
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}
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.text BLOCK(4K) : ALIGN(4K)
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{
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*(.text)
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}
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.rodata BLOCK(4K) : ALIGN(4K)
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{
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*(.rodata)
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}
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.data BLOCK(4K) : ALIGN(4K)
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{
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*(.data)
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}
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.bss BLOCK(4K) : ALIGN(4K)
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{
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*(.initial_stack)
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*(COMMON)
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*(.bss)
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}
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__KERNEL_IMAGE_END = .;
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}

‎src/boot/multiboot2.s‎

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// Multiboot 2 specification from https://gnu.org/software/grub/manual/multiboot2/multiboot.html
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.set MULTIBOOT2_MAGIC, 0xE85250D6
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.set MULTIBOOT2_ARCH, 0
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.section .multiboot2
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__MULTIBOOT2_HEADER_START:
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.long MULTIBOOT2_MAGIC
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.long MULTIBOOT2_ARCH
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.long __MULTIBOOT2_HEADER_END - __MULTIBOOT2_HEADER_START
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.long -(MULTIBOOT2_MAGIC+MULTIBOOT2_ARCH+(__MULTIBOOT2_HEADER_END-__MULTIBOOT2_HEADER_START))
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.align 8
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__MULTIBOOT2_TAG_ALIGN_MODULE:
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.short 0x06
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.short 0x00
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.long 8
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.align 8
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__MULTIBOOT2_TAG_END:
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.short 0
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.short 0
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.long 8
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.align 8
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__MULTIBOOT2_HEADER_END:
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// MULTIBOOT2 HEADER END
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‎src/common/debug.c‎

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#include "debug.h"
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#include "printf.h"
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#include "textmode.h"
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//TODO: Add support for register printing
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void kernel_panic(char* message)
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{
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textmode_chattr(15, 4);
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textmode_clear();
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textmode_puts("\"KERNEL HAS POPPED\"\n\nAn unrecoverable error has been occurred in the kernel. The kernel will be halting...\n\nMessage: ");
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textmode_puts(message);
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textmode_puts("\n");
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__KERNEL_ASM("cli; hlt");
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}
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void kernel_assert(const char* file, int line, const char* statement, bool state)
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{
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if(state == true)
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return;
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textmode_chattr(15, 4);
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textmode_clear();
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printf("\"TACTICAL NUKE INCOMING...\"\n\nAn assertion has failed in the kernel. Kernel cannot verify its stability. Therefore, kernel will be halting...\n\nKernel: %s\nFile: %s:%d\nStatement: %s\n", __KERNEL_NAME" v"__KERNEL_VERSION, file, line, statement);
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__KERNEL_ASM("cli; hlt");
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}

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