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riscv64: virtio-keyboard-pci, interrupt-driven keyboard input (item 4.3.5c)

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Punch list §25 item 4.3.5c complete.

Amended from a nonexistent MMIO transport to PCI (matching the board's
actual virtio-blk-pci precedent). New virtio-input driver: eventq with
pre-posted buffers, PLIC source computed at runtime from PCI slot/pin
(derived live from this host's QEMU riscv64 DTB), mandatory ISR-status
read, PCI interrupt-disable-bit check. New VKBD-EVENT/VKBD-DEBUG FORTH
words. Verified with a real QEMU sendkey keypress: exact KEY_A/press
match, two real interrupts serviced, zero exceptions. Three-arch
acceptance boot clean.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-08-08 11:51:07 -04:00
co-authored by Claude Sonnet 5
parent 5f4df673c1
commit 8251aebcf8
21 changed files with 73408 additions and 226 deletions
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logs/20260808-114435/amd64/qemu-amd64-20260808-114435.log
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logs/20260808-114907/riscv64/qemu-riscv64-20260808-114907-sendkey-verify.log
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