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Bitflow

A hobby 32-bit x86 kernel written in C and assembly.

Screenshot

Features

  • Protected mode with ring 0/3 separation
  • Preemptive multitasking with round-robin scheduling
  • Keyboard input via PS/2 interrupt handler
  • ATA disk driver for loading tasks at runtime
  • Simple shell with command execution
  • VGA text mode console

Tutorial

A step-by-step guide to building this kernel from scratch is available in the tutorial folder.

Building

Requires an i686-elf cross-compiler toolchain (GCC, LD) and NASM.

make

Running

make run          # curses mode (in terminal)
make run-window   # graphical window

Disk Layout

Sector 0     Boot sector
Sector 1     File table (generated at build time)
Sector 2+    Kernel
...          Tasks, fonts

The file table maps task names to their disk sectors, so the loader can find them at runtime without hardcoded offsets.

Shell Commands

  • help - list commands
  • about - version info
  • tasks - show running tasks
  • task_a, task_b - load sample tasks from disk
  • quit - shutdown

License

MIT