Land #92 on main (first light framebuffer) - #93
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A Loon program draws rectangles on a 640x480 display, as the kernel, through an `Fb` effect that falls through the handler stack to a ramfb driver — the same shape as `Console.write` falling through to the UART. - src/fwcfg.rs: QEMU fw_cfg via its DMA interface, to find `etc/ramfb`. - src/ramfb.rs: a linear XRGB framebuffer in RAM that QEMU scans out. Tell it where the buffer is once; drawing is writing memory. No queues, no interrupts. - `Fb` effects: width, height, clear, fill-rect, present. Integer-only ABI (coords, sizes, 0xRRGGBB). Raster is Rust behind rect-sized primitives on purpose — per-pixel Loon would be ~150 ms/frame at current speed. - boot/gui.oo runs only when the machine has a display; headless boots skip it and `make check` is unaffected. Without a ramfb, Fb ops raise a loud error naming the missing device. - `make gui` boots with a cocoa window and stays up. `make screenshot` boots headless, waits for the GUI, and pulls the frame over QMP as a PNG (tools/screenshot.py, no dependencies) — the CI-shaped way to prove the display works. Not yet: text, input, host-side Fb parity, time in the event loop. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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#92 was stacked on #91 and merged into that branch after #91 had already
landed, so the framebuffer commit (
2321976) never reachedmain. Thischerry-picks it onto
main— no new code, just delivering what was alreadyreviewed in #92.
🤖 Generated with Claude Code