walaos

A hobby operating system, written from scratch in C for x86 (i386). I work on it in my spare time for fun and to learn more about how operating systems work under the hood.

Requirements

To build and run walaos you'll need:

• A i686-elf cross-compiler toolchain (i686-elf-gcc, i686-elf-ar, i686-elf-as)
• grub-mkrescue and grub-file (for building the bootable ISO)
• xorriso (used by grub-mkrescue)
• qemu (to run the OS, qemu-system-i386)

Building

./build.sh   # builds libc + kernel into sysroot
./iso.sh     # builds a bootable ISO
./qemu.sh    # builds and boots the ISO in QEMU

Checklist

Done:

• Cross-compiler toolchain and build system
• GRUB multiboot boot + bootable ISO
• GDT setup
• IDT / ISR setup
• PIC remapping
• PIT timer
• Serial logging
• VGA text mode terminal (with cursor)
• Keyboard input
• Kernel panic handling
• Formatted printing (printf-style)

To do:

• Physical/virtual memory management (paging)
• Heap allocator
• Multitasking / scheduler
• System calls
• Userspace processes
• Filesystem