Daniel Samson
a53c2b0193
system/services/acpi and system/services/fdt exist as documented placeholders (silent clean-exit mains; the headers say exactly what each becomes and why). The build's -Ddiscovery=acpi|fdt option fills the ramdisk's neutral 'discovery' slot — the device manager will spawn "discovery" by that name in M20.3 and never learn which firmware it is on (m19-m20-plan.md decision 7). x86 defaults to acpi; the aarch64 target flips the default when it lands.
31 lines
1.5 KiB
Zig
31 lines
1.5 KiB
Zig
//! /system/services/acpi — the ACPI discovery service: the x86 firmware
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//! interpreter, moved out of ring 0 (docs/m19-m20-plan.md, M20). **Placeholder:
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//! not implemented until M20.1** — it exists so the build's `-Ddiscovery`
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//! option has both of its values and the ramdisk's neutral `discovery` slot is
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//! wired before the implementation lands.
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//!
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//! What it becomes (the plan's decisions 5 and 7): claim the `acpi-tables`
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//! node the kernel publishes (table blobs + the broad io_port grant + the SCI),
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//! map the tables, and run the **shared AML module** in ring 3 behind a `Hal`
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//! backed by `mmio_map` and `io_read`/`io_write` — the interpreter cannot tell
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//! it moved. Then the bus-driver shape: `device_register` the namespace
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//! devices (`_HID`, `_CRS` resources, containment against the node's
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//! apertures), report each to the device manager, stay resident under its
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//! supervision. M21 grows the event side on the same claim: the SCI, PM1 fixed
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//! events, GPEs, Notify — published through the domain-named power protocol,
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//! never an "ACPI events" protocol.
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const runtime = @import("runtime");
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pub fn main() void {
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// Not implemented: exit cleanly and silently (a bare spawn by the
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// initial-ramdisk sweep must not derange other tests' markers). The
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// supervisor reads a clean exit as "meant to stop" — correct for a
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// placeholder.
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}
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pub const panic = runtime.panic;
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comptime {
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_ = &runtime.start._start; // pull the runtime entry shim into the image
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}
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