Replace the mouse driver's synthetic stream with the real path, the
way the keyboard was wired:
- The auxiliary port's IRQ12 is enumerated on the mouse's own ACPI
node (PNP0F13), and the kernel only lets a device's claimer bind or
ack its IRQs — so ps2-bus now claims that node alongside the
controller whenever port 2 carries a device, binds IRQ12 to its one
endpoint, and re-arms whichever line the notification's badge names.
The forwarding loop already routed auxiliary bytes by status bit 5.
- mouse-packet.zig (new, pure, host-tested): three-byte stream-mode
packet assembly — bit-3 sync with resynchronization, ACK/BAT bytes
dropped at packet start, nine-bit two's-complement movement,
overflow packets discarded, and PS/2 positive-Y-up converted to the
screen convention (positive down).
- mouse.zig mirrors the keyboard driver: no hardware claim, attaches
to the bus as its mouse, and publishes button_down/button_up per
changed button plus motion events with the pressed-button mask.
Verified end to end in QEMU via monitor mouse_move/mouse_button:
motion round-trips in screen coordinates, buttons transition with the
right mask, and keyboard events keep flowing alongside. The follow-up
is the IntelliMouse magic-knock for a scroll wheel (four-byte packets)
and scroll events.
Replace the keyboard driver's synthetic stream with the real path:
- ps2-bus binds IRQ1 (interrupt bits set only after the bind), drains
port 0x60 on each interrupt, and forwards every byte to the attached
child driver over async ipc_send, routed by the status register's
auxiliary-output bit. Children attach via the new well-known ps2_bus
service, handing over their endpoint as a capability.
- scancode.zig (new, pure, host-tested): scancode set 2 -> USB HID
usage decoding (F0/E0/E1 prefix state machine) plus keyboard state —
pressed-key bitmap, typematic-repeat classification, modifier and
caps-lock tracking.
- keyboard.zig decodes the forwarded stream and publishes real
key_down/key_press/key_up events, filling key_press characters via
xkeyboard-config (layout from argv[2], default us) and synthesizing
ASCII control characters for Enter/Tab/Backspace/Escape.
- protocol.zig names the full HID usage set in Keycode; build.zig
threads the xkeyboard-config module into user binaries.
Verified end to end in QEMU via monitor sendkey: shift, caps lock,
and control-character synthesis all decode correctly. The mouse
driver still publishes its synthetic stream; attaching it to the
bus the same way is the follow-up.
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).
Extend the input service beyond the keyboard so mouse and joystick/gamepad
drivers can broadcast too, with per-device publish and subscribe methods.
- protocol: KeyEvent joins MouseEvent (motion/buttons/scroll) and
JoystickEvent (axes/buttons), all carried in a common InputEvent envelope
tagged with a DeviceKind. A subscribe request carries a device_mask, so a
subscriber names the classes it wants and the service routes each event only
to interested subscribers (a mouse-only listener never wakes for keystrokes).
- runtime: per-device publish methods (publishKeyboardEvent/publishMouseEvent/
publishJoystickEvent) and subscribe helpers (subscribeKeyboard/Mouse/Joystick,
each typed, plus subscribe(mask)/subscribeAll returning the tagged envelope).
- service: subscriber table gains a device_mask; broadcast routes by the
event's device class.
- mouse driver now publishes (synthetic) mouse events like the keyboard driver;
input-source cycles all three classes; input-test subscribes to all and only
emits its "ok" marker once it has received one of each class — so the passing
test proves per-device routing, not just delivery. Real HID decoding stays a
follow-up.
No kernel changes: ipc_send is generic and the 36-byte InputEvent fits its
64-byte payload. Full QEMU suite 48/48; serial log confirms keyboard, mouse,
and joystick all reach one subscription.
Programs can now subscribe to keyboard events (key_down/key_up/key_press)
and drivers can broadcast them, through a new user-space input service.
The delivery model is forced by danos IPC: a synchronous rendezvous holds
one pending reply, so a server cannot park N subscribers blocked in a
"wait for next event" call — delivery must be push. But a synchronous push
has no timeout and the kernel never wakes a sender parked on a dead peer's
endpoint, so one dying subscriber would hang all input. So this lands the
roadmap's planned asynchronous buffered send and builds the service on it:
- ipc_send (syscall 26): non-blocking post to an endpoint's bounded payload
ring, delivered through reply_wait as a buffered message (notify_message_bit).
A full ring drops the oldest. It can never hang on a dead/slow peer.
- input-protocol + runtime.input helpers (subscribe/next, connectSource/
publish) — the first real consumer of M13 capability passing: a subscriber
hands the service its own endpoint as a capability.
- input service (fan-out via ipc_send, dead-subscriber pruning), a synthetic
input-source, and input-test; the ps2-bus keyboard driver publishes to it.
Real IRQ1 scancode decoding (which must live in the bus, the PNP0303 owner)
is a documented follow-up; the source is synthetic for now.
- build/init wiring, an `input` QEMU case, and docs/input.md.
Full QEMU suite 48/48, including the new input case and every IPC/endpoint
regression (ipc, ipc-call, ipc-cap, vfs, hpet, bus, irqfree).
Daniel Samson