88 lines
2.8 KiB
Markdown
88 lines
2.8 KiB
Markdown
yggdrasil-kernel
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Rust Unix-like operating system kernel.
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See also:
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* [ABI for kernel-user communication](https://git.alnyan.me/yggdrasil-abi)
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* [Rust fork to use with the kernel](https://git.alnyan.me/yggdrasil/yggdrasil-rust)
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* [Userspace programs](https://git.alnyan.me/yggdrasil/yggdrasil-userspace)
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* [yboot — x86-64 UEFI bootloader](https://git.alnyan.me/yggdrasil/yboot)
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Main features
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-------------
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* Architecture support: [aarch64](/src/arch/aarch64) and [x86_64](/src/arch/x86_64)
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* Kernel/userspace preemptive multithreading
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* Kernel-space multitasking with `async`/`await` runtime
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* Symmetric Multiprocessing
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* Unix-like virtual filesystem:
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files, directories, block/char devices, symlinks, mounts
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* In-memory read-write filesystem for tar-based initrd
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* sysfs/devfs
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* Binary formats: ELF + `#!/...` shebangs
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* Rust-style interfaces for most of the stuff like memory management, devices etc.
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aarch64-specific:
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* PSCI for SMP start-up and power control
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* PL011 serial port
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* ARM generic timer as system/monotonic timer
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* GICv2 IRQ controller
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x86_64-specific:
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* UEFI boot through [yboot](https://git.alnyan.me/yggdrasil/yboot)
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(no plans for legacy boot)
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* PCIe, with plans to extend to aarch64 as well
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* NVMe drive support (read/write)
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* AHCI SATA drive support (read/write)
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* I/O and Local APIC IRQ controllers
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* PS/2 keyboard,
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* i8253-based timer (got some problems with HPET on
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real hw, had to revert, lol)
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* COM ports
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* ACPI, [work in progress](https://github.com/rust-osdev/acpi), mostly broken
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on real hardware
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* ACPI shutdown
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* PCI IRQ pin routing
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* Events like power button, etc.
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* Fancy framebuffer console
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Userspace features:
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* Sanitized system calls better suited for Rust
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* Userspace threads
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* Synchronization primitives through futex-like interface
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* Unix-like signals and exceptions
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General plans (in no particular order)
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--------------------------------------
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* Better unification of architecture code
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* `async` for VFS (?)
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* PCIe NVMe block device
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* PCIe SATA block device
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* PCIe XHCI USB devices
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* Better algorithms for memory management
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Navigation
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----------
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* `src/arch` — architecture-specific code
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* `src/device` — device driver implementations
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* `bus` — bus devices like USB, PCIe etc.
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* `display` — everything related to graphic displays
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* `power` — power and reset controllers
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* `serial` — serial transceiver drivers
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* `devtree.rs` — stuff related to ARM DeviceTree
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* `tty.rs` — Unix-style terminal driver implementation
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* `src/fs` — in-kernel filesystems (sysfs/devfs)
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* `src/mem` — memory management
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* `src/proc` — process information management
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* `src/syscall` — system call handling
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* `src/task` — kernel and userspace tasks, processes and threads
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* `src/util` — utilities used within the kernel
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* `src/init.rs` — kernel init thread impl.
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