Kernel: Actually parse the DSDT

Kernel/CMakeLists.txt

@@ -640,7 +640,14 @@ set(AK_SOURCES
 )
 
 set(ACPI_SOURCES
+    ../Userland/Libraries/LibACPI/Interpreter.cpp
+    ../Userland/Libraries/LibACPI/NameString.cpp
+    ../Userland/Libraries/LibACPI/Node.cpp
+    ../Userland/Libraries/LibACPI/Object.cpp
+    ../Userland/Libraries/LibACPI/OpcodeFilters.cpp
+    ../Userland/Libraries/LibACPI/OpcodeFrame.cpp
     ../Userland/Libraries/LibACPI/Table.cpp
+    ../Userland/Libraries/LibACPI/TableStream.cpp
 )
 
 set(DT_SOURCES

Kernel/Firmware/ACPI/Parser.cpp

@@ -2,6 +2,7 @@
  * Copyright (c) 2020-2021, Liav A. <[email protected]>
  * Copyright (c) 2020-2021, Andreas Kling <[email protected]>
  * Copyright (c) 2022, the SerenityOS developers.
+ * Copyright (c) 2026, Undefine <[email protected]>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -151,12 +152,21 @@ UNMAP_AFTER_INIT ErrorOr<void> Parser::process_dsdt()
     // Add DSDT-pointer to expose the full table in /sys/firmware/acpi/
     TRY(m_sdt_pointers.try_append(PhysicalAddress(sdt->dsdt_ptr)));
 
-    auto dsdt_or_error = Memory::map_typed<::ACPI::Structures::DSDT>(PhysicalAddress(sdt->dsdt_ptr));
-    if (dsdt_or_error.is_error()) {
-        dmesgln("ACPI: DSDT is unmappable");
-        return {};
+    if (kernel_command_line().acpi_feature_level() == AcpiFeatureLevel::Enabled) {
+        m_aml_interpreter = TRY(::ACPI::AML::Interpreter::create());
+        ArmedScopeGuard guard = [&]() {
+            // Ensure the AML interpreter is cleaned up if an error occurs.
+            m_aml_interpreter = nullptr;
+        };
+
+        auto dsdt = TRY(Memory::map_typed<::ACPI::Structures::DSDT>(PhysicalAddress(sdt->dsdt_ptr)));
+        dsdt = TRY(Memory::map_typed<::ACPI::Structures::DSDT>(PhysicalAddress(sdt->dsdt_ptr), dsdt->h.length));
+
+        dmesgln("ACPI: Using DSDT @ {} with {} bytes", PhysicalAddress(sdt->dsdt_ptr), dsdt->h.length);
+
+        TRY(m_aml_interpreter->load(ReadonlyBytes { dsdt.ptr(), dsdt->h.length }));
+        guard.disarm();
     }
-    dmesgln("ACPI: Using DSDT @ {} with {} bytes", PhysicalAddress(sdt->dsdt_ptr), dsdt_or_error.value()->h.length);
 
     return {};
 }

Kernel/Firmware/ACPI/Parser.h

@@ -16,6 +16,7 @@
 #include <Kernel/Memory/TypedMapping.h>
 #include <Kernel/Memory/VirtualAddress.h>
 #include <LibACPI/Definitions.h>
+#include <LibACPI/Interpreter.h>
 
 namespace Kernel::ACPI {
 
@@ -97,6 +98,8 @@ private:
     bool m_xsdt_supported { false };
     ::ACPI::FADTFlags::HardwareFeatures m_hardware_flags;
     ::ACPI::FADTFlags::x86_Specific_Flags m_x86_specific_flags;
+
+    OwnPtr<::ACPI::AML::Interpreter> m_aml_interpreter;
 };
 
 }