Daniel Samson
d7a154a596
Turn a keycode + modifiers into a character. The input module delivers HID
usage keycodes but nothing mapped them to characters; rather than hand-maintain
layout tables, vendor the X11 xkeyboard-config database and compile it to native
Zig at build time (no X11 runtime), the way make-initial-ramdisk.py packs the
ramdisk.
- tools/make-xkeyboard-config.py: `fetch` downloads the pinned xkeyboard-config
release (2.44, sha256-verified), resolves the include graph for the configured
layouts, and vendors only the reached symbols files + keysymdef.h + COPYING +
PROVENANCE into library/xkeyboard-config/vendor/. `generate` parses that
(keycodes via a HID->xkb-name table, symbols with include/augment/override and
per-key type, keysymdef for keysym->Unicode) and emits generated/layouts.zig
deterministically.
- library/xkeyboard-config/xkeyboard-config.zig: the API over the generated data
— map(layout, hid_usage, mods) -> { keysym, character }, byName, and the
level-selection semantics (the generated tables stay pure data). Host tests
assert US letters/digits with Shift/Caps, GB £ vs US # on Shift+3, and French
AZERTY q-where-US-has-a — the end-to-end proof of the parse->emit->lookup path.
- build.zig: `xkeyboard-config` + `layouts` modules, the test wired into
`zig build test`, and a `zig build gen-xkeyboard-config` convenience step.
- Layouts: us, gb, de, fr, es, dvorak. Scope (documented): group 1, no dead-key
composition, curated key types. Standalone library; wiring it into the input
path to fill KeyEvent.character is a documented follow-up.
zig build test green (incl. the new keymap tests); regeneration is byte-identical;
full QEMU suite 48/48 (unaffected — no kernel/runtime/service change).
DanOS
Codename: Shodan Version: 1
A small operating system, written from scratch in Zig — a bootloader (boot/)
and a microkernel (system/kernel/), sharing a neutral handoff contract (system/boot-handoff.zig).
It boots x86-64 via UEFI, and so far has a framebuffer console, a physical frame
allocator, its own paging with W^X permissions, interrupt/exception handling, a
LAPIC timer, a kernel heap, a fixed-priority preemptive scheduler, and in-kernel IPC
channels. See docs/ for how each piece works.
Prerequisites
- Zig 0.16.x — the build is pinned to this line (
.zig-version); other minor versions are rejected, because Zig makes breaking changes between releases pre-1.0. A toolchain manager such as zvm orzigupwill pick up.zig-versionautomatically. - QEMU (
qemu-system-x86_64) — to run and test the kernel. On macOS,brew install qemualso bundles the OVMF firmware below. - OVMF UEFI firmware — the
edk2-ovmfpackage (Arch),ovmf(Debian/Ubuntu), oredk2-ovmf(Fedora); on macOS it ships inside the Homebrewqemuformula. Both the build and the test harness probe the known Arch/Debian/Fedora/macOS layouts and use the first that exists, so no configuration is normally needed. Override with-Dovmf-code=/-Dovmf-vars=(build) if yours lives elsewhere. - Python 3 — for the QEMU integration test harness.
Build
zig build
Produces a FHS-shaped zig-out/ that is the danos filesystem and the boot volume:
the UEFI bootloader at zig-out/EFI/BOOT/BOOTX64.efi, the kernel at
zig-out/system/kernel, init at zig-out/system/services/init, drivers under
zig-out/system/drivers/, and the initial-ramdisk at zig-out/boot/.
Run
Boot it in QEMU with OVMF (opens a display window):
zig build run-x86-64
# distro with OVMF elsewhere:
zig build run-x86-64 -Dovmf-code=/path/OVMF_CODE.fd -Dovmf-vars=/path/OVMF_VARS.fd
Test
zig build test # host unit tests (the platform-independent shared code)
python3 test/qemu_test.py # QEMU integration tests: boots the kernel and asserts
# on its serial output (see docs/testing.md)
The integration harness builds and boots the kernel once per test case, checking memory, the frame allocator, paging (incl. NX and the null guard), the heap, interrupts, and exception handling. It exits non-zero on any failure, so it drops straight into CI.
Documentation
Design notes explaining the why behind the code live in
docs/ — start with docs/README.md.
Logo
San Serif Text "Dan OS" with a black karate belt around it.