RainOS

RainOS is a simple OS with a monolithic kernel, designed for old computers.

Setup

To run it, you need a cross compiler for the i686 target. Here you'll find some directions

To compile it, just type

$ make

The makefile assumes your cross-compiler folder is in the PATH. Out-of-tree builds aren't tested.

You can also type make iso to create an ISO with the system or make qemu to launch it on QEMU.

Minimal Requirements

• A P6-level processor
• 2 MiB of RAM

ToDo list

If you want, you can help me with these tasks

• [X] Jump to usermode and run some basic code
• [X] Improve VFS and create filesystem drivers, like
  • [X] a FAT driver
  • [ ] a ext driver
• [ ] Add virtual 8086 support
• [ ] Add VBE support (for creating framebuffers in BIOS systems)
• [ ] Add DMA support in ATA driver
• [X] Add an ELF parser
  • [ ] Launch ELF code in usermode
• [ ] Create some syscalls
• [ ] Support x86-64
• [ ] Support UEFI
  • [ ] Add GOP framebuffer support (framebuffers in UEFI)
• [ ] Support, at least, one ARM board, like
  • [ ] Integrator/CP
  • [ ] Beaglebone
  • [ ] Raspberry PI
• [ ] Add SATA disk support
• [ ] Add networking
• [ ] Add USB support