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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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include/starkernel/pci.h
+4
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@@ -31,11 +31,15 @@
#define PCI_CFG_BAR5 0x24
#define PCI_CFG_CAP_PTR 0x34
#define PCI_CFG_INT_LINE 0x3C
#define PCI_CFG_INT_PIN 0x3D /* 0=none, 1=INTA .. 4=INTD (item 4.3.5c/4.3.5d) */
/* PCI command register bits */
#define PCI_CMD_IO_SPACE (1u << 0)
#define PCI_CMD_MEM_SPACE (1u << 1)
#define PCI_CMD_BUS_MASTER (1u << 2)
#define PCI_CMD_INTX_DISABLE (1u << 10) /* item 4.3.5c/4.3.5e: pci_enable() never
* clears this -- if firmware left it set,
* INTx never asserts. Check explicitly. */
/* BAR type flags */
#define PCI_BAR_TYPE_MASK 0x1u