Utilities: Add a simple utility to test out LibACPI

This is a simple program meant to load a AML table and dump out the
root namespace afterwards.

Co-authored-by: RatcheT2497 <[email protected]>

Userland/Utilities/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(CMD_SOURCES_CPP
     abench.cpp
     aconv.cpp
+    acpi.cpp
     adjtime.cpp
     allocate.cpp
     animation.cpp
@@ -300,6 +301,7 @@ install(CODE "file(CREATE_LINK /usr/lib/Loader.so ${CMAKE_INSTALL_PREFIX}/bin/ld
 
 target_link_libraries(abench PRIVATE LibAudio LibFileSystem)
 target_link_libraries(aconv PRIVATE LibAudio LibFileSystem)
+target_link_libraries(acpi PRIVATE LibACPI LibFileSystem LibMain)
 target_link_libraries(animation PRIVATE LibGfx)
 target_link_libraries(aplay PRIVATE LibAudio LibFileSystem LibIPC)
 target_link_libraries(asctl PRIVATE LibAudio LibIPC)

Userland/Utilities/acpi.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025, RatcheT2497 <[email protected]>
+ * Copyright (c) 2026, Undefine <[email protected]>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/MemoryStream.h>
+#include <LibACPI/Interpreter.h>
+#include <LibACPI/TableStream.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/MappedFile.h>
+#include <LibCore/System.h>
+#include <LibFileSystem/FileSystem.h>
+#include <LibMain/Main.h>
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    Vector<StringView> input_files;
+
+    Core::ArgsParser args_parser;
+    args_parser.set_general_help("ACPI management utility.");
+    args_parser.add_positional_argument(input_files, "Files containing AML table bytecode to load.", "input");
+    args_parser.parse(arguments);
+
+    if (input_files.is_empty())
+        return Error::from_string_literal("Input file is required, use '-' to read from standard input");
+
+    TRY(Core::System::pledge("stdio rpath"sv));
+
+    for (auto input : input_files)
+        TRY(Core::System::unveil(TRY(FileSystem::absolute_path(input)), "r"sv));
+    TRY(Core::System::unveil(nullptr, nullptr));
+
+    auto interpreter = TRY(ACPI::AML::Interpreter::create());
+    for (auto input : input_files) {
+        auto maybe_input_file = Core::MappedFile::map(input);
+        if (maybe_input_file.is_error()) {
+            warnln("Failed to open {}: {}", input, maybe_input_file.release_error());
+            return 1;
+        }
+
+        auto input_file = maybe_input_file.release_value();
+        TRY(interpreter->load(input_file->bytes()));
+    }
+
+    TRY(interpreter->print_namespace());
+    return 0;
+}