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Hardware run 3 showed the same PED=0 SETUP halt and then never reached the
prompt. Two boot-time hazards explain the death:
- reset_port polled PED with a 2,000,000-iteration MMIO loop (seconds on real
silicon) and the reset retry ran it twice per port, so the port scan alone
exceeded the boot watchdog window (task 0 in one frame for 7.5 s panics).
- while no HID was found the cursor task re-ran the whole EHCI scan, port
resets included, every second -- a rate-matching hub never settles.
Changes:
- every EHCI wait is wall-clock bounded: halt/reset/run 500 ms, PED 200 ms
- control-transfer timeout 5 s -> 500 ms
- per-controller 3 s port-scan budget; no automatic re-scan (explicit
`usb rescan` only)
- 300 ms power-up settle before the reset walk (RMH bring-up)
- boot-phase watchdog 750 -> 2000 ticks (20 s), room for hub bring-up
- xHCI gets the same persistent bottom-row port/device summary
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hardening
EHCI (OptiPlex 7010 / Q77 and similar Intel PCH):
- enumerate *both* EHCI controllers (00:1a.0 + 00:1d.0), not just the first
- hub support: read the hub class descriptor, power/reset each port via hub
class requests, read the child speed, then drive the child with split
transactions carrying the hub's address and port (TT). On 7-series PCH the
root port presents the integrated Rate Matching Hub (8087:0024, class 9)
and the mouse/keyboard sit behind it; without this the driver stopped at
"no HID mouse/keyboard endpoint in config".
- HID mouse *and* keyboard, boot protocol + idle, per-device periodic QH
chained into the frame list, per-device report buffers and counters
- periodic re-arm follows the standard shape (qTD re-activated, Next-qTD
re-linked); the HC owns the status/toggle overlay
- DMA from the page allocator inside [16 MiB, 4 GiB): EHCI programs 32-bit
addresses and the page bitmap spans all RAM
- 2 ms recovery after SET_ADDRESS
xHCI:
- scratchpad buffers (HCSPARAMS2) and MaxSlotsEn > 1, with per-slot EP0 and
interrupt rings plus per-slot device contexts
- DMA from the page allocator instead of the heap allocator
- boot protocol + idle, mouse + keyboard, first-report diagnostics
- transfer events are routed to every device before matching a waiter, so a
second device's enumeration cannot swallow an armed device's report
shared:
- rsnix/src/hid.rs: HID usage -> scancode-set-1 tables, one scancode FIFO
feeding ps2::feed_scancode, per-device boot-keyboard report differ
- WM input pump polls PS/2 -> UHCI -> EHCI -> xHCI
- memory::alloc_pages_range(count, min, max) for bounded DMA allocations
QEMU coverage: make test-usb (EHCI + xHCI, mouse + keyboard). QEMU's EHCI
split path delivers only the first report for FS devices, so repeated-report
delivery and the RMH path remain hardware-test items.
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- Add polled EHCI (USB2) and UHCI (USB1.1) host-controller drivers with
HID boot mouse support, wired into cursor polling and the 'usb' shell cmd
- Add USB Legacy ownership handoff (claim_usb_legacy) plus config_write_byte
- Harden boot: verify the PIT/timer ticks before shell entry, EOI stray
interrupts in the LAPIC to stop interrupt storms, bound PS/2 controller
waits, and INTx-disable AHCI (polled driver)
- Add boot stage markers, klog screen echo, and QR lock; scheduler
mark_shell_running; NO_USB stopgap to keep BIOS USB-Legacy input alive
- alloc_pages_above for DMA buffers that must avoid low conventional memory
- Expand DEBUG_NOTES with EHCI/QEMU bring-up findings
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Polled xHCI driver (mouse-only): controller bring-up, port reset,
enable-slot -> address-device -> config-descriptor walk -> HID boot
mouse IN endpoint, one outstanding IN TRB drained on poll. Cursor
task polls usb first, PS/2 second. New 'usb'/'usb rescan' shell cmds.
Verified in QEMU (q35 + OVMF + qemu-xhci + usb-mouse): movement and
all three buttons tracked exactly; heap stays clean.
Fixes en route: MaxPorts=HCSPARAMS1[31:24]; operational regs CRCR=0x18
DCBAAP=0x30 CONFIG=0x38; pass input-context ptr in Address-Device;
Input Control Context DW0=Drop DW1=Add; HID walker bInterfaceClass at
+5; async discovery from cursor task.
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