Axiom OS

This is my attempt at creating a modern 64-bit kernel in Nim.

Requirements

• Nim 1.9.3
• MinGW-w64
• QEMU
• UEFI BIOS image:
  • Arch: sudo pacman -S edk2-ovmf
  • Ubuntu: sudo apt install ovmf

Compile and run

$ nim c --os:any --out:fatimg/EFI/BOOT/BOOTX64.EFI src/boot/boot.nim
$ qemu-system-x86_64 \
    -bios /usr/share/edk2-ovmf/x64/OVMF_CODE.fd \
    -drive format=raw,file.driver=vvfat,file.rw=on,file.dir=fatimg \
    -nic none \
    -machine q35 \
    -debugcon stdio -global isa-debugcon.iobase=0x402

Note that the above path for OVMF_CODE.fd is the default install path on Arch Linux. For Ubuntu use the path /usr/share/OVMF/OVMF_CODE.fd instead.

Features

• UEFI bootloader
  • Simple Text Protocol
  • Graphics Output Protocol (GOP)
  • Kernel loader
• Hardware Detection
  • UEFI Memory Map
  • ACPI: I/O APIC
  • ACPI: Local APICs
  • PCI bus enumeratoin
  • VGA
  • AHCI storage controller
  • SMBIOS information
• Graphics Output
  • Bochs Graphics Adaptor (BGA)
  • Framebuffer
  • Font rendering
• Segment Descriptors
  • Global Descriptor Table (GDT)
  • 64-bit flat memory model
• Interrupts
  • Interrupt Descriptor Table (IDT)
  • Fault and Trap handlers
• Memory Management
  • Page frame allocator
  • Paging (Virtual Memory)
  • Kernel memory allocator
• Preemptive Multitasking
  • Kernel threads
  • User threads
  • Timer IRQ handler
  • Scheduler
• Multiprocessor Support
  • SMP
  • Scheduler
• Keyboard Input
  • Keyboard IRQ handler
  • Scancode conversion
  • Key event packet
  • Buffering
• Storage
  • SATA ACHI driver
• File System
  • TBD
• System Calls
  • TBD

License

MIT