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impala

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1.0.0

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Welcome

Impala is homemade UNIX-like operating system, it was developed as bechelor project at University of Wroclaw, Poland.

The 4.4BSD, FreeBSD, Ultrix and Solaris source codes had big impact on structure of our operating system, so probably it could be a good start to developing real UNIX-based system (not Linux based).

Authors

Mateusz Kocielski (shm)
Artur Koninski (takeshi)
Pawel Wieczorek (wieczyk)

Kernel features

virtual memory (supports i686 global pages extension)
virtual file system layer, with FAT12, ext2, device file system (devfs) and memory file system support
floppy controller driver with ISA DMA support
ATA controller driver with PIO support
kernel-level threads
priority-based scheduler
inter process communication: SystemV message queues, pipes, signals
scanning PCI devices :) (not finished driver for PCI bus)

and very small thing:

GRUB multiboot with command line

User-space features

library compatible with PTHREADS (maybe in details this compatibility fails)
our libc
programs are in AOUT/ZMAGIC format
ported Almquist Shell (from the FreeBSD sources)
ported VTTEST program
ported minigzip program and libz library
tar (handles only USTAR archives) program with progress bar :-)
ported nvi (from FreeBSD sources)

Quality

We put many effort to achieve good quality, but we had only few months to develop whole system, so it contains many bugs etc. If you are interrested in hacking operating system then Impala could be good sandbox for you.

Building

To build operating system you need binutils and gcc for i386-pc-aout and i386-pc-elf targets. Run the tools/install_sdk.sh script in empty directory, it will automaticly install toolchains (in the ${HOME}/ImpalaSDK directory).

When you have SDK, type those commands to build whole system: