https://github.com/tatskaari/zigzag

An operating system written from scratch in Zig
https://github.com/tatskaari/zigzag

Last synced: 24 days ago
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An operating system written from scratch in Zig

• Host: GitHub
• URL: https://github.com/tatskaari/zigzag
• Owner: Tatskaari
• License: unlicense
• Created: 2024-08-09T18:27:03.000Z (3 months ago)
• Default Branch: main
• Last Pushed: 2024-08-29T13:31:14.000Z (2 months ago)
• Last Synced: 2024-08-29T20:28:33.592Z (2 months ago)
• Language: Zig
• Size: 799 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# zigzag is an operating system with a terrible name

It's written from scratch, with love, in zig. 

## Roadmap

Currently trying to figure out the feature set needed to port binutils and a shell (zsh maybe?).

The feaures are loosely:

- A userspace

- A TTY implementation

- A libc port (should be easy enough once we have a posix like abi)

- A filesystem

The roadmap to achieve this is:

- [x] VGA graphics mode

- [x] VGA terminal

- [x] Initialise the interrupt descriptor table

- [x] MoreCore allocator

- [x] Configure the GDT with kernel and user segments for long mode

- [x] Read the root system descriptor table

- [x] Read the MADT

- [x] APIC setup

- [x] PS/2 Keyboard input

- [x] PIT timer

- [x] Paging: allocating pages and mapping them to virtual addresses

- [x] Paging: mmap and a std.heap.PageAllocator

- [x] Lapic timer

- [x] Scheduler (basic scheduling of threads)

  - [ ] Set up the TSS and get exceptions handled from threads

  - [ ] Implement wait, yield and sleep

  - [ ] Implement an event queue and terminal thread that listens to keyboard events

  - [ ] Run lspci from the keybaord listener as a thread

- [ ] Implement the proc/sys filesystems for pci devices

- [ ] Processes and elf loading: move lspci out into its own binary

- [ ] Basic userspace + entrypoint

- [ ] Syscall ABI for memory mapping

- [ ] Filesystem service for embedded tar 

- [ ] Keyboard service

- [ ] TTY service

- [x] PCI device discovery

- [ ] SATA/IDE driver

- [ ] Read/write FAT-32 filesystem (over IDE)

- [ ] Open and write syscalls

- [ ] Create a standard library for userspace programmes

- [ ] Exec syscall

- [ ] Fork syscall