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

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.

• A P6-level processor
• 2 MiB of RAM

If you want, you can help me with these tasks

• Jump to usermode and run some basic code
• Improve VFS and create filesystem drivers, like
  • 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
• 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