Chimp OS

A primitive 32 bit operating system. Written in C.

Targeting x86 i386 architecture.

Builds with Binutils & GCC (i386-elf-gcc) cross-compiler toolchain.

Boots with GRUB, runs in QEMU and on hardware.

Currently iterating on kernel design and userspace while implementing a standard library for functionality.

This is a recreational programming project.

demo.mov

Requirements

• i386-elf cross compiler (GCC)
• Linker and Assembler (Binutils)
• QEMU
• GRUB bootloader

Usage

$ ./clean.sh                    # clears out object & binaries for new build
$ ./headers.sh                  # reads in headers
$ ./iso.sh                      # generate .iso
$ ./qemu.sh                     # run!

Kernel Implementation

This is a list of what has been implemented so far. I will update as often as possible.

• Supports Multiboot via GRUB
• Paging (Virtual Memory Space)
• Interrupt Service Routines (ISRs)
• Interrupt Requests (IRQs)
• VGA Graphics
• Teletype Terminal (TTY)
• Programmable Interval Timer (PIT) - handles system uptime
• Keyboard Handler (keyboard hardware IRQs, (IRQ1))
• Standard Library (growing!)
• Global Descriptor Table (GDT) & Interrupt Descriptor Table (IDT)
• Stack Smashing Protector (SSP) - detect stack buffer overrun

Design Notes

libc and libk libc: hosted library, required.

libk: freestanding library that does not contain any code specific to user space