feat: power down dGPUs on hybrid graphics laptops

kernel/src/ACPI/AML/AmlParser.hpp

@@ -5,6 +5,7 @@
 */
 
 #pragma once
+#include <ACPI/ACPI.hpp>
 #include <cstdint>
 
 namespace Hal {
@@ -27,11 +28,20 @@ namespace Hal {
         // interpreter or namespace.
         SleepObject FindSleepState(void* dsdtData, int state);
 
-        // Initialize the AML interpreter with the DSDT.
-        // This loads the full table into the namespace and enables
+        // Initialize the AML interpreter with the DSDT, then every SSDT the
+        // XSDT lists (xsdt may be null to load the DSDT alone).
+        // This loads the full tables into the namespace and enables
         // method evaluation, device enumeration, and field access.
         // Should be called during boot after ACPI table discovery.
-        void InitializeInterpreter(void* dsdtData);
+        void InitializeInterpreter(void* dsdtData, ACPI::CommonSDTHeader* xsdt);
+
+        // Run the namespace initialization the OS owes the firmware once its
+        // address-space handlers are up: _REG for PCI_Config, then \_SB._INI
+        // and every present device's _INI, parents first. Firmware works out
+        // which OS it is running under (OSYS, from _OSI) in these, and gates
+        // much of its later behaviour -- device power control included -- on
+        // the answer. Call once the Embedded Controller and PCI are up.
+        void InitializeNamespaceObjects();
 
     };
 };