Claude
3bd81097e1
The header scan (Captain Bob, 2026-11-10): 788 source files -- 351 with the
SL-1.0 header, 12 with the old name (docs/working/experiments, kept by
ruling), 31 under someone else's licence (tools/kconfig, Linux's, GPL-2.0:
kept), and 394 with none. Ruled: the SPDX form; capsules (.4th, .f18) and
proofs (.thy) left for a ruling of their own (mkcapsule's 64x16 block format,
content-addressed capsules).
253 files now begin
SPDX-License-Identifier: LicenseRef-Starship-1.0
Copyright (c) 2023-2026 Robert A. James
as a /* */ block (C, headers, assembly, linker scripts) or # lines (scripts,
Makefiles, Kconfig; below a shebang or a coding line); tools/mkcapsule.c,
which had the copyright line, gets the SPDX line only.
Not touched: docs/working/ (archive and old campaign material, as the
ruling kept the experiments); v4/system/post_cases.c (generated by
v4/tools/mkpost.py, "do not edit" -- the generator has the header).
Comments only: the kernel builds on amd64, aarch64, riscv64; make -C v4
test-32: 39 programs, 0 failures; every changed script parses.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* SPDX-License-Identifier: LicenseRef-Starship-1.0
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* Copyright (c) 2023-2026 Robert A. James
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*/
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/*
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* virtio_rng.h — Virtio 1.0 entropy source driver for StarKernel
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*
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* Real hardware/host entropy, uniformly across all three architectures.
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* Exists specifically because this kernel has no per-arch RNG that covers
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* all three ISAs: amd64 has RDRAND and riscv64 has the Zkr extension, but
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* QEMU's aarch64 CPU models (including "max") expose neither RNDR nor any
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* other RNG property (checked directly against QEMU 10.2.1, see
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* vm_uuid.h's identical finding). A paravirtualized virtio-rng device
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* sidesteps the per-ISA gap entirely: the host supplies the entropy, the
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* guest-side protocol is identical on all three arches.
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*
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* QEMU-only: there is no virtio-rng on real hardware (Milestone 8, bare-
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* metal boot). A real per-arch RNG driver is a separate, later problem.
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*
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* Only one virtio-rng device is supported.
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*/
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#ifndef STARKERNEL_VIRTIO_RNG_H
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#define STARKERNEL_VIRTIO_RNG_H
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#include <stddef.h>
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#include <stdint.h>
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/* virtio PCI vendor (shared with every virtio device) */
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#define VIRTIO_RNG_PCI_VENDOR_ID 0x1AF4u
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/* device IDs: virtio device id 4 (entropy source) */
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#define VIRTIO_RNG_DEVICE_MODERN 0x1044u
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#define VIRTIO_RNG_DEVICE_LEGACY 0x1005u
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/*
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* virtio_rng_init — locate the virtio-rng device on the PCI bus and bring
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* the driver up. Call once, before the first virtio_rng_get_bytes() call.
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*
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* Returns 0 on success.
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* Returns -1 if no virtio-rng device was found on the PCI bus.
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* Returns -2 on driver initialisation failure (bad BAR, queue setup, etc.).
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*/
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int virtio_rng_init(void);
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/*
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* virtio_rng_ready — 1 if virtio_rng_init() has already succeeded.
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*/
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int virtio_rng_ready(void);
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/*
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* virtio_rng_get_bytes — fill buf with n bytes of real host-supplied
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* entropy, blocking (polling) until all n bytes are obtained. The device
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* may return fewer bytes than requested per request; this loops
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* internally until the buffer is full.
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*
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* Returns 0 on success (buf fully filled).
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* Returns -1 if virtio_rng_init() has not succeeded.
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* Returns -2 on a device/timeout error partway through.
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*/
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int virtio_rng_get_bytes(uint8_t *buf, size_t n);
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#endif /* STARKERNEL_VIRTIO_RNG_H */
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