_______ _ _ ____ _____
|__ __| (_) | | / __ \ / ____|
| | ___ _ __ _ __ ___ _ _ __ __ _| | | | | | (___
| |/ _ \ '__| '_ ` _ \| | '_ \ / _` | | | | | |\___ \
| | __/ | | | | | | | | | | | (_| | | | |__| |____) |
|_|\___|_| |_| |_| |_|_|_| |_|\__,_|_| \____/|_____/
- This is a barebones 32 bit operating system written completely from scratch.
- nasm boot/bootsector.asm -f bin -o bin/boot.bin
- gcc -ffreestanding -c kernel/kernel.c -o kernel/kernel.o
- ld -o bin/kernel.bin -Ttext 0x1000 kernel/kernel.o --oformat binary
- cat bin/boot.bin bin/kernel.bin > os-image.bin
- qemu-system-i386 -hda os-image.bin
- nasm boot/bootsector.asm -f bin -o bin/boot.bin
- gcc -ffreestanding -m32 -c kernel.c -o kernel.o
- nasm -f elf32 -o kernel_entry.o kernel_entry.asm
- ld -m elf_i386 -Ttext 0x1000 -o kernel.bin kernel_entry.o kernel.o
- cat bin/boot.bin kernel/kernel.bin > os-image.bin
- ndisasm -b 32 basic.bin > basic.dis
- Basic bootsector is written which can bootstrap our qemu based system to load into 32 bit protected mode
- C based compilation and linking scripts are done
- A real basic VGA driver which can clear the screen and print lines onto the screen are implemented
- Cursor movement is finished
- Color setting using driver functions are enabled, both foreground and background. Uses standard VGA color values
- Boot screen is finished, ASCII ART based logo looks good
- Make file built to automate build process
- switched to an i386 compatible cross compiler
- Scroll
- Keyboard IO complete (How idt works and PIC remapping part is still a bit sketchy but it works)
- Caps lock functionality has been added. All alphabets can have 2 types now...Uppercase and lowercase
-
Nasty linking bug which explodes binary size to > 130mb ==> fixed but can operate only in fda mode ==> Fixed
-
Follow here for solution (linking bug)
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Fix found for fda mode only, issue was osimage being too small for 15 sectors to read, so qemu-resize os image to a minimum of 20kb here
