Robert Allan JamesandClaude Sonnet 5
90ee8deb6d
arch_early_init() unconditionally cleared satp on every boot, justified only by behavior observed under QEMU/EDK2 firmware (satp.MODE=10/Sv57, kernel identity-mapped within it). That reasoning never applied to the native U-Boot+OpenSBI boot path, where satp is conventionally already 0 at S-mode handoff -- the unconditional clear was likely a harmless no-op there, but on an unverified assumption. Fix: read satp.MODE first and return early when it's already 0 (nothing to switch away from, no safety argument needed). The unconditional csrw/sfence pair still runs unchanged for the confirmed QEMU/EDK2 case. No Sv39/Sv48/Sv57 page-table walker built -- out of proportion to this finding's severity. 3-arch acceptance: amd64/aarch64 don't compile this file, so their runs are non-regression on untouched files only. riscv64's own boot log confirms satp.MODE = 0xa at entry, so the mode != 0 branch ran and "satp cleared -- Bare mode, explicit" printed exactly as before the fix. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019YcT3H2PQeyujrzjqS3Var
experiments/
Design of Experiments (DoE) campaign data and analysis for the LithosAnanke kernel.
bare_metal/— the bare-metal DoE experiment: blind full-factorial 2⁴ runs measuring the L8 Jacquard mode selector's effect on the Steady-State Machine across amd64/aarch64/riscv64. Seeexperiments/bare_metal/README.mdfor the full directory layout (runs/,latest/,analysis/{charts,tables,report}).
Hosted-VM DoE campaigns (factorial/heartbeat/ablation studies) live under
docs/working/experiments/ instead — this top-level directory is
specifically the kernel/bare-metal side.