Initial commit

Author: Arun007coder

.gitignore

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+*.elf
+*.iso
+.vscode
+.vscode/*

COPYING

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+TOOLDIR=/opt/cross/bin/
+SRCDIR=src/
+INCLUDEDIR=$(SRCDIR)/include/
+BACKUPDIR=$(SRCDIR)/../../BACKUP/
+GRUBDIR=
+
+
+CC=$(TOOLDIR)/i686-elf-gcc
+CFLAGS= -I$(INCLUDEDIR) -I/usr/include -nostdlib -lgcc -fno-builtin -fno-exceptions -fno-leading-underscore -Wno-write-strings -m32
+
+CXX=$(TOOLDIR)/i686-elf-g++
+CXXFLAGS=
+
+LD=$(TOOLDIR)/i686-elf-ld
+LINKERFILE=src/boot/link.ld
+LDFLAGS= -T$(LINKERFILE)
+
+AS=$(TOOLDIR)/i686-elf-as
+ASFLAGS=
+
+NASM=nasm
+NASMFLAGS=
+
+QEMU=qemu-system-i386
+QEMUFLAGS=
+
+PROJECT=SEOS
+
+EXECUTABLE=$(PROJECT).elf
+ISOFILE=$(PROJECT).iso
+
+OBJECTS= 	$(SRCDIR)/boot/boot.o \
+			$(SRCDIR)/drivers/io/ports.o \
+			$(SRCDIR)/common/system.o \
+			$(SRCDIR)/kernel/kernel.o
+
+all: kernel iso
+
+kernel: $(EXECUTABLE)
+iso: $(ISOFILE)
+
+$(EXECUTABLE): $(OBJECTS)
+	@echo '[LD] $@'
+	@$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
+
+$(ISOFILE): $(EXECUTABLE)
+	@echo '[GRUB] $@'
+	@mkdir -p $(PROJECT)/boot/grub
+	@cp $(EXECUTABLE) $(PROJECT)/boot/
+	@echo 'set timeout=3' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo 'set default=0' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo 'set root=(cd)' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo '' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo 'menuentry "$(PROJECT)" { '>> $(PROJECT)/boot/grub/grub.cfg
+	@echo 'multiboot /boot/$(EXECUTABLE)' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo 'boot' >> $(PROJECT)/boot/grub/grub.cfg
+	@echo '}' >> $(PROJECT)/boot/grub/grub.cfg
+	@$(GRUBDIR)grub-mkrescue -o $(ISOFILE) $(PROJECT)
+	@rm -rf $(PROJECT)/
+
+
+%.o : %.c
+	@echo '[CC] $@'
+	@$(CC) $(CFLAGS) -c -o $@ $<
+
+%.o : %.s
+	@echo '[GAS] $@'
+	@$(AS) $(ASFLAGS) -o $@ $<
+
+%.o : %.asm
+	@echo '[NASM] $@'
+	@$(NASM) $(NASMFLAGS) -o $@ $<
+
+PHONY: clean
+clean:
+	@echo 'Cleaning the source directory...'
+	@rm $(OBJECTS) $(EXECUTABLE) $(ISOFILE)

Makefile

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+# SEOS(Title pending)
+
+A new rewrite of SectorOS_RE2.
+
+The kernel is currently v0.23.03.1ALP
+
+## Build
+
+To build the project, execute `make` command in root directory of the project
+
+## License
+
+This project is licensed under the [GNU GPLv3](../COPYING). <img align="right" src="https://www.gnu.org/graphics/gplv3-with-text-136x68.png"></img>

docs/README.md

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+26-03-2023: 06:25 PM IST
+* Initial Commit
+* Added Makefile
+* Added boot.s
+* Added link.ld
+* Added system.h
+* Added system.c
+* Implemented port IO

docs/changelog.txt

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+.set ALIGN, 1<<0
+.set MEMINFO, 1<<1
+.set FLAGS, ALIGN|MEMINFO
+.set MAGIC, 0x1BADB002
+.set CHECKSUM, -(MAGIC + FLAGS)
+
+.section .multiboot
+.align 4
+.long MAGIC
+.long FLAGS
+.long CHECKSUM
+
+.section .bss
+.align 16
+stack_bottom:
+.skip 16384
+stack_top:
+
+.section .text
+.global _start
+.extern kernelmain
+.type _start, @function
+_start:
+    mov $stack_top, %esp
+    push %eax
+    push %ebx
+    call kernelmain
+
+stop:
+    cli
+1:  hlt
+    jmp 1b
+
+.size _start, . - _start

src/boot/boot.o

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+ENTRY(_start)
+
+SECTIONS
+{
+  . = 1M;
+
+  .text BLOCK(4K) : ALIGN(4K)
+  {
+    *(.multiboot)
+    *(.text)
+  }
+  .rodata BLOCK(4K) : ALIGN(4K)
+  {
+    *(.rodata)
+  }
+  .data BLOCK(4K) : ALIGN(4K)
+  {
+    *(.data)
+  }
+  .bss BLOCK(4K) : ALIGN(4K)
+  {
+    *(COMMON)
+    *(.bss)
+  }
+
+  k_end = .;
+}

src/boot/boot.s

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+#include "system.h"
+#include "ports.h"
+
+void reboot()
+{
+    outb(0x64, 0xFE);
+}