ScaraOS

A 32-bit multiboot OS kernel for IA32 (PC/AT) systems, written to teach myself OS fundamentals and have some fun. PCI support, the beginnings of paged memory management, the start of a VFS layer, plus the basic PC/AT stuff — timer, PIC, keyboard, floppy.

The most recent version adds a working inode and dentry cache, pre-emptive multi-tasking, demand loading, and a syscall interface — so far just exec(2), open(2), close(2), read(2), write(2), and exit(2). fork(2) and others wait on the next milestone: context switching to and from userspace. Screenshot. More detail lives on the wiki, kept as a sort of pseudo-blog of development.

Features

Mostly written in C
Multiboot compliant
Pre-emptive multi-tasking
Paged memory management, including demand loading of files, anonymous memory areas, and ELF binaries
Virtual filesystem switch with inode and page cache
EXT2 support
Slab allocator
Block I/O subsystem
Floppy disk controller driver
32-bit protected mode
8254 PIT support
8259A PIC support
PCI device enumeration
VGA text mode output

TODO

Implement dentry cache
Buddy allocator for multi-page allocations
Then all the fun stuff

Downloads

Version 0.0.6 (latest) — source · bootable floppy image
Version 0.0.5 — source · bootable floppy image
Version 0.0.4 — source · bootable floppy image
Version 0.0.3 — source · bootable floppy image
Version 0.0.2 — source · bootable floppy image
Version 0.0.1 — source · bootable floppy image

Follow development:

git clone git://github.com/giannitedesco/scaraOS.git

Features

TODO

Downloads

License