ors

ors is an experimental x86_64 OS implementation with Rust.

Setup

# Rust nightly required at the moment
rustup default nightly

# Build ors-loader.efi and ors-kernel.elf
make

# Run on QEMU
make qemu
# ... is equivalent to
./qemu/make_and_run_image.sh \
    target/x86_64-unknown-uefi/debug/ors-loader.efi \
    target/x86_64-unknown-none-ors/debug/ors-kernel.elf

Comparison

ors is based on MikanOS, blog_os (Second Edition), and xv6.

	ors	MikanOS	blog_os	xv6
Target	x86_64	x86_64	x86_64	x86 1
Written in	Rust	C++	Rust	C
Boot by	UEFI BIOS	UEFI BIOS	Legacy BIOS 2	Legacy BIOS
Screen Rendering	GOP by UEFI	GOP by UEFI	VGA Text Mode	VGA Text Mode
Serial Port	16550 UART	-	16650 UART	16650 UART
Hardware Interrupts	APIC	APIC	8259 PIC	APIC
Keyboard Support	PS/2	USB (xHCI)	PS/2	PS/2
Mouse Support	-	USB (xHCI)	-	-
Block Support	VirtIO over PCI	- 3	-	IDE 4
Timers	APIC + ACPI PM	APIC + ACPI PM	8259 PIC	APIC
Multitasking	Preemptive	Preemptive	WIP 5	Preemptive
File System	FAT	FAT 6	-	original 7

Roadmap

• Complete ゼロからの OS 自作入門
  • Chapter 0-3: Boot loader
  • Chapter 4-5: Screen rendering
  • Chapter 6, 12: User inputs
  • Chapter 7: Interrupts
  • Chapter 8: Physical memory management
  • Chapter 9-10 (skipped)
  • Chapter 11: Timers
  • Chapter 13-14: Multitasking
  • Chapter 15-16: Terminal and comamnds
  • Chapter 17: File system
  • Chapter 18: User applications
  • Chapter 19: Paging
  • Chapter 20: System calls
  • TBD
  • Chapter 27: Application memory management
  • TBD
• Complete Writing an OS in Rust (second edition)
  • Bare Bones
  • Interrupts
  • Memory Management
  • Multitasking (Incomplete)
• Compare with xv6
• Enable multicore
• Try to implement TCP protocol stack

Resources

• ors uses Tamzen font.
• ors uses One Monokai Theme as a color scheme of the terminal.

Footnotes

1. Maintaining the x86 version have stopped, and switched to the RISC-V version ↩

2. UEFI is planned ↩

3. Supports only very limited reading (by UEFI Block I/O) ↩

4. RISC-V version of xv6 supports VirtIO over MMIO ↩

5. blog_os supports Cooperative Multitasking at the moment ↩

6. Read-only support ↩

7. Simpler but similar to modern UNIX file systems, including crash recovering ↩