Robert Allan JamesandClaude Sonnet 5
21ad5f7373
Growable owner_pubkey[32]-list devblock type for the metadata fence, one slot over from zuse_genesis_marker_t (§H.5 Phase 6). Type only, no read/add/check logic yet. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QgooKd5hJNtTYqB6CyK5f9
84 lines
4.3 KiB
C
84 lines
4.3 KiB
C
/*
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* zuse_eligibility_list.h -- on-disk record format for Zuse's word/block
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* elevation eligibility list (FABRIC-3.md §H.5/§H.12 Phase 6): a simple
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* growable list of owner_pubkey[32] entries, no extra per-entry metadata
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* ("simple list, no extra metadata, unless we find a reason this won't
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* work"). Zuse checks this list before honoring any ELEVATE-REQUEST
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* (§H.7/§H.8) -- gating layer on top of the message-based elevation
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* trigger, not a replacement for it.
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*
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* Lives in the same top-of-device system-metadata fence as
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* zuse_genesis_marker_t (block_subsystem.h's blk_meta_zone_read()/
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* write(), Phase 8/§C), one slot over: the genesis marker owns
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* devblock_from_top=0, this list starts at devblock_from_top=1. Growable
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* across multiple devblocks via a singly-linked chain (each devblock's
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* `next_devblock_from_top` points at the next one, ZULIST_NO_NEXT means
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* "this is the last devblock in the chain") -- entries are appended by
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* filling the current tail devblock, then chaining a fresh one out of the
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* already-reserved BLK_META_FENCE_INIT budget once it's full. No fence
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* growth logic is needed yet: only 2 of the 128 pre-reserved devblocks
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* are spoken for (0 = genesis marker, 1 = this list's head) and the
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* chain has 126 more slots to grow into before that budget itself would
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* need extending.
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*
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* Raw, unpacked 4 KiB devblock -- same convention as
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* zuse_genesis_marker_t/homeblocks_sig_t: real CRC from day one, this
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* gates a real security check, not a placeholder.
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*/
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#ifndef STARKERNEL_ZUSE_ELIGIBILITY_LIST_H
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#define STARKERNEL_ZUSE_ELIGIBILITY_LIST_H
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#include <stdint.h>
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/* Packed via shifts, not a hand-computed hex literal -- see
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* zuse_genesis_marker.h's own note on this project's standing
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* numeric-constant convention. */
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#define ZUSE_ELIGIBILITY_LIST_MAGIC \
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((uint32_t)'Z' | ((uint32_t)'E' << 8) | ((uint32_t)'L' << 16) | ((uint32_t)'G' << 24))
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#define ZUSE_ELIGIBILITY_LIST_VERSION 1u
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/* devblock_from_top of this list's head devblock -- one past the genesis
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* marker's devblock_from_top=0. */
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#define ZUSE_ELIGIBILITY_LIST_HEAD_DEVBLOCK 1u
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/* next_devblock_from_top value meaning "no further devblock -- this is
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* the tail of the chain." 0xFFFFFFFF can never be a real
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* devblock_from_top (BLK_META_FENCE_INIT is 128), so it is unambiguous. */
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#define ZUSE_ELIGIBILITY_LIST_NO_NEXT 0xFFFFFFFFu
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/* How many owner_pubkey[32] entries fit in one devblock alongside the
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* header/crc/next-pointer overhead below. */
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#define ZUSE_ELIGIBILITY_ENTRIES_PER_DEVBLOCK 127u
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typedef struct {
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uint32_t magic; /* ZUSE_ELIGIBILITY_LIST_MAGIC; anything else on
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* the head devblock means "list not created
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* yet" (blank/foreign bytes), not a
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* format-corruption error. A non-head devblock
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* is only ever read by following a real
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* next_devblock_from_top link, so its own
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* magic is still checked the same way to catch
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* a corrupt/foreign devblock mid-chain. */
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uint32_t version; /* ZUSE_ELIGIBILITY_LIST_VERSION */
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uint32_t count; /* Number of valid entries in this devblock's
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* own entries[] (0..ZUSE_ELIGIBILITY_ENTRIES_
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* PER_DEVBLOCK), not a running total across the
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* whole chain. */
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uint32_t next_devblock_from_top; /* Next devblock in the chain, or
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* ZUSE_ELIGIBILITY_LIST_NO_NEXT if this is the
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* tail. */
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uint8_t entries[ZUSE_ELIGIBILITY_ENTRIES_PER_DEVBLOCK][32]; /* Ed25519
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* public keys eligible for elevation. Only the
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* first `count` entries are meaningful. */
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uint64_t crc; /* CRC-64/ISO (block_subsystem.h's
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* compute_crc64()) over every byte of this
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* struct up to (not including) this field. */
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uint8_t _pad[4096 - (4 + 4 + 4 + 4 + (ZUSE_ELIGIBILITY_ENTRIES_PER_DEVBLOCK * 32) + 8)];
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} zuse_eligibility_devblock_t;
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_Static_assert(sizeof(zuse_eligibility_devblock_t) == 4096,
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"zuse_eligibility_devblock_t must be exactly one 4 KiB devblock");
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#endif /* STARKERNEL_ZUSE_ELIGIBILITY_LIST_H */
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