feat: add support for aarch64 timer/interrupts, port MontaukOS userspace

kernel/src/ACPI/AcpiShutdown.cpp

@@ -38,8 +38,24 @@ namespace Hal {
                 return;
             }
 
-            // Map and parse the DSDT to find \_S5_
             auto* dsdt = (void*)Memory::HHDM(fadt.DsdtAddress);
+
+            AML::InitializeInterpreter(dsdt, xsdt);
+
+            if (AML::GetInterpreter().IsInitialized()) {
+                AcpiDevices::DeviceList devices{};
+                AcpiDevices::EnumerateAll(devices);
+            }
+
+            AcpiSleep::Initialize(xsdt);
+
+            // Hardware-reduced ACPI (ARM) has no PM1 registers: the
+            // architecture powers off instead (Arch::PowerOff).
+            if ((fadt.Flags & FADT::FlagHardwareReduced) || fadt.PM1aControlBlock == 0) {
+                KernelLogStream(INFO, "ACPI") << "No PM1 control block - ACPI S5 shutdown unavailable";
+                return;
+            }
+
             AML::S5Object s5 = AML::FindS5(dsdt);
 
             if (!s5.Valid) {
@@ -55,23 +71,6 @@ namespace Hal {
 
             KernelLogStream(OK, "ACPI") << "ACPI shutdown initialized (PM1a=" << base::hex
                 << (uint64_t)g_pm1aControlBlock << " SLP_TYPa=" << (uint64_t)g_slpTypA << ")";
-
-            // Initialize the full AML interpreter with the DSDT.
-            // This loads the entire DSDT namespace, enabling device enumeration,
-            // method evaluation, and field I/O for the rest of the kernel.
-            AML::InitializeInterpreter(dsdt, xsdt);
-
-            // Enumerate ACPI devices now that the namespace is loaded
-            if (AML::GetInterpreter().IsInitialized()) {
-                AcpiDevices::DeviceList devices{};
-                AcpiDevices::EnumerateAll(devices);
-            }
-
-            // Initialize S3 suspend support (reads FACS and \_S3_ from namespace)
-            AcpiSleep::Initialize(xsdt);
-
-            // Note: ACPI event handling (SCI, power button) is initialized
-            // from Main.cpp after the APIC subsystem is ready.
         }
 
         bool IsAvailable() {