rajamesandJunie
a8b70e88d3
Source tree reorganization: - Move StarForth v3 engine to v3/ (src/, include/, Makefile) - Move kernel to kernel/ (src/, include/, linker/, Makefile) - Create v4/ skeleton for F18-ISA golden model (DECOMPOSITION.md, JUSTIFICATION.md) - Move FABRIC-0..4.md to docs/fabric/ - Move ONTOLOGY.md and ROADMAP.md to docs/ Board infrastructure: - Add boards/ser5/, boards/raspi/, boards/milkv/, boards/zynq7020/ - Each board has board.mk (ISA, CPU flags, boot recipe) and README.md - Root Makefile becomes thin dispatcher: boot_image, all, clean, docs take TARGET - make boot_image TARGET=SER5|RASPI|MILKV builds one GPT/MBR image per board - ZYNQ7020 target exists but stops with clear error (ARMv7 port not built yet) - scripts/mkdiskimage.sh builds disk images for all boards Docs pipeline: - docs/book/ with LaTeX master (main.tex) and Makefile - pandoc converts Markdown to LaTeX at build time - Two Lua filters: table-widths.lua (wide tables wrap), code-breaks.lua (inline code breaks) - make docs builds single PDF (754 pages, 0 missing characters) - make docs TARGET=<board> adds board appendix - build/docs/<book|board>/meta.tex stamps git commit into PDF Bug fixes: - 42 include paths that only worked by accident now use correct relative paths - clang-18 hardcode replaced with configurable CC variable (fixed aarch64 build) - Pi 5: kernel_2712.img linked at 0x80000, .bss zeroed, memory reserved - Doxyfile, .clang-tidy, README.md, Kconfig paths updated Verified: - Hosted v3 build passes 1012 tests, 0 failures - SER5 image boots in QEMU (OVMF), POST passes, K exact (65536 = Q48_ONE) - Milk-V image boots in QEMU (OpenSBI + U-Boot + bootefi), POST passes - make clean TARGET=<board> removes only that board and its ISA objects - make all builds all boards, hosted v3, and docs in one run Co-authored-by: Junie <junie@jetbrains.com>
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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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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