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kernel: flatten the device/discovery code, merge power into acpi, rename fdt

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Follow-up cleanup of the just-moved kernel device code:

- power.zig -> acpi.zig. Its reboot() is built entirely on the FADT reset
  register (acpi.power_information) plus the legacy 0xCF9/8042 fallbacks — it is
  ACPI reboot, so it becomes acpi.reboot (the "P" in ACPI). platform.reboot
  still delegates; soft-off/S5 stays the ring-3 acpi service's job as before.

- device-tree.zig -> fdt.zig. It is a discovery *backend* (the ARM/FDT parser,
  a sibling of acpi.zig), not part of the model — renaming it to its actual
  subject kills the confusing device-tree / device-model DeviceTree name clash
  and makes acpi.zig + fdt.zig read as the two parallel backends.

- Flatten: device-model.zig, acpi.zig, fdt.zig, platform.zig move out of the
  system/kernel/devices/ subdir up into system/kernel/, joining devices-broker.zig
  (already flat). The kernel dir is a flat pile by convention (only architecture/
  is a subdir), so the subdir — and its poor "devices" name — is gone.

Pure restructure; "platform" module name unchanged, all cross-file deps are
relative siblings that moved together. zig build + test green; smoke, discovery,
acpi-parse, acpi-ps2, acpi-report, power-button, orderly-shutdown, reboot pass.
This commit is contained in:
Daniel Samson
2026-07-22 21:49:20 +01:00
parent 3a155cdc7d
commit 11f567ee20
12 changed files with 67 additions and 72 deletions
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docs/power.md
+3 -3
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@@ -92,9 +92,9 @@ fails rather than hangs.
`acpi-tables` node ([discovery.md](discovery.md)) already put the PM1 control
ports in the acpi service's hands, so writing S5 from ring 3 is something it
could physically already do; formalizing it as a protocol operation added a
contract, not authority. The kernel's `system/kernel/devices/power.zig` keeps only
**reboot** (the FADT reset register plus the legacy fallbacks, which need no AML);
it has no poweroff path at all — S5 is not a kernel operation.
contract, not authority. The kernel keeps only **reboot** (`acpi.reboot` in
`system/kernel/acpi.zig` — the FADT reset register plus the legacy fallbacks, which
need no AML); it has no poweroff path at all — S5 is not a kernel operation.
## Verifying it