Robert Allan JamesandClaude Sonnet 5
b9c540a78b
Chains off the device descriptor request via a new deferred-action mechanism on xhci_dev_t (next_action/next_action_slot_id/next_action_length): a short 9-byte Configuration descriptor read learns wTotalLength, then a full read retrieves Config+Interface+Endpoint descriptors, walked for the Interface descriptor to confirm bInterfaceClass/SubClass/Protocol == Mass Storage/ SCSI/Bulk-Only Transport. The deferral exists because ringing the next doorbell synchronously inside xhci_poll_events()'s event-processing loop -- before the current event's ERDP write -- hung the guest outright (confirmed live via checkpoint logging, amd64). Fixed by moving the actual control-transfer submission to a small dispatch at the end of xhci_poll_events(), after ERDP is updated. A debug hack that shipped mid-session (forcing a repeated 9-byte read instead of chaining into the real 44-byte length, to isolate whether the hang was doorbell-ordering or length-specific) has been reverted: restored the real length and re-verified live. The doorbell-ordering fix was the whole story -- the 44-byte read completes cleanly. Verified live via QMP hotplug, all three architectures, byte-identical results: wTotalLength=0x2c, bInterfaceClass=0x08, bInterfaceSubClass=0x06, bInterfaceProtocol=0x50 -- confirmed Mass Storage/SCSI/BOT. Disconnect confirmed clean on every arch, no wedge. FABRIC-2.md Section X Milestone 2f updated with the full writeup. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QPfdtaXs9ay1nbwuMnrscu
src/starkernel/
LithosAnanke — the bare-metal UEFI kernel that boots StarForth directly on
hardware (amd64/aarch64/riscv64). Built only via Makefile.starkernel; the
only valid acceptance test is the three-arch QEMU boot (see
.claude/CLAUDE.md), never make test.
kernel_main.c— kernel entry point, driving the boot milestones (console init, PMM, VMM, interrupts, timers, kmalloc heap, VM bootstrap).repl.c— kernel REPL.doe_log.c— kernel-side DoE (Design of Experiments) metrics logging.
Subdirectories:
arch/{amd64,aarch64,riscv64}/— per-architecture support (APIC/GIC/ PLIC interrupt controller, timers, boot/ISR assembly).boot/— UEFI loader, ELF loading, kernel command-line parsing.capsule/— capsule birth/run/load/validate pipeline.hal/— hardware-abstraction-layer implementation (console, framebuffer, VT100, memory, host services).hash/— XXHash64 content-addressing implementation.math/— kernel-build Q48.16 fixed-point arithmetic.memory/— physical/virtual memory managers and the kernel heap.pci/— PCI bus enumeration.virtio/— VirtIO block device driver.vm/— kernel VM subsystem (bootstrap, core interpreter, parity logging, capsule arena).
See include/starkernel/README.md for the corresponding headers.