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- ehci: DEBUG_MATRIX was left true in be868a4, so every boot replaced
enumeration with the one-shot diagnostic transfer matrix and returned
false -- the EHCI driver never brought a device up. Default it off;
flip it back on only when bisecting a controller fault.
- new rsnix/src/hid.rs: boot-keyboard HID usage -> scancode-set-1
tables, the shared scancode FIFO, and a per-device report differ.
UHCI now uses it instead of its own copy, so EHCI/xHCI keyboards can
feed the same PS/2 decoder (`ps2::feed_scancode`).
- uhci: SET_PROTOCOL now asks for the boot protocol (wValue 0) instead
of report protocol (wValue 1). In report protocol the report layout
is device-defined, but every driver parses boot reports.
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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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