Kernel: Move ACPI and BIOS code into the new Firmware directory

This will somwhat help unify them also under the same SysFS directory in
the commit.
Also, it feels much more like this change reflects the reality that both
ACPI and the BIOS are part of the firmware on x86 computers.

Kernel/Firmware/ACPI/Parser.h

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2020-2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+#include <Kernel/CommandLine.h>
+#include <Kernel/FileSystem/SysFSComponent.h>
+#include <Kernel/Firmware/ACPI/Definitions.h>
+#include <Kernel/Firmware/ACPI/Initialize.h>
+#include <Kernel/Interrupts/IRQHandler.h>
+#include <Kernel/Memory/Region.h>
+#include <Kernel/PhysicalAddress.h>
+#include <Kernel/VirtualAddress.h>
+
+namespace Kernel::ACPI {
+
+class ACPISysFSDirectory : public SysFSDirectory {
+public:
+    static void initialize();
+
+private:
+    ACPISysFSDirectory();
+};
+
+class ACPISysFSComponent : public SysFSComponent {
+public:
+    static NonnullRefPtr<ACPISysFSComponent> create(String name, PhysicalAddress, size_t table_size);
+
+    virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
+
+protected:
+    KResultOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const;
+    ACPISysFSComponent(String name, PhysicalAddress, size_t table_size);
+
+    PhysicalAddress m_paddr;
+    size_t m_length;
+};
+
+class Parser final : public IRQHandler {
+public:
+    static Parser* the();
+
+    static void must_initialize(PhysicalAddress rsdp, PhysicalAddress fadt, u8 irq_number);
+
+    virtual StringView purpose() const override { return "ACPI Parser"; }
+    virtual bool handle_irq(const RegisterState&) override;
+
+    Optional<PhysicalAddress> find_table(const StringView& signature);
+
+    void try_acpi_reboot();
+    bool can_reboot();
+    void try_acpi_shutdown();
+    bool can_shutdown() { return false; }
+
+    void enable_aml_parsing();
+
+    PhysicalAddress rsdp() const { return m_rsdp; }
+    PhysicalAddress main_system_description_table() const { return m_main_system_description_table; }
+    bool is_xsdt_supported() const { return m_xsdt_supported; }
+
+    void enumerate_static_tables(Function<void(const StringView&, PhysicalAddress, size_t)>);
+
+    virtual bool have_8042() const
+    {
+        return m_x86_specific_flags.keyboard_8042;
+    }
+
+    const FADTFlags::HardwareFeatures& hardware_features() const { return m_hardware_flags; }
+    const FADTFlags::x86_Specific_Flags& x86_specific_flags() const { return m_x86_specific_flags; }
+
+    ~Parser() {};
+
+private:
+    Parser(PhysicalAddress rsdp, PhysicalAddress fadt, u8 irq_number);
+
+    void locate_static_data();
+    void locate_main_system_description_table();
+    void initialize_main_system_description_table();
+    size_t get_table_size(PhysicalAddress);
+    u8 get_table_revision(PhysicalAddress);
+    void process_fadt_data();
+
+    bool validate_reset_register();
+    void access_generic_address(const Structures::GenericAddressStructure&, u32 value);
+
+    PhysicalAddress m_rsdp;
+    PhysicalAddress m_main_system_description_table;
+
+    Vector<PhysicalAddress> m_sdt_pointers;
+    PhysicalAddress m_fadt;
+
+    bool m_xsdt_supported { false };
+    bool m_can_process_bytecode { false };
+    FADTFlags::HardwareFeatures m_hardware_flags;
+    FADTFlags::x86_Specific_Flags m_x86_specific_flags;
+};
+
+}