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/BIOS.h

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+#include <AK/Vector.h>
+#include <Kernel/FileSystem/SysFS.h>
+#include <Kernel/KBuffer.h>
+#include <Kernel/Memory/MappedROM.h>
+#include <Kernel/Memory/Region.h>
+#include <Kernel/PhysicalAddress.h>
+#include <Kernel/VirtualAddress.h>
+
+namespace Kernel::SMBIOS {
+
+struct [[gnu::packed]] LegacyEntryPoint32bit {
+    char legacy_sig[5];
+    u8 checksum2;
+    u16 smboios_table_length;
+    u32 smbios_table_ptr;
+    u16 smbios_tables_count;
+    u8 smbios_bcd_revision;
+};
+
+struct [[gnu::packed]] EntryPoint32bit {
+    char sig[4];
+    u8 checksum;
+    u8 length;
+    u8 major_version;
+    u8 minor_version;
+    u16 maximum_structure_size;
+    u8 implementation_revision;
+    char formatted_area[5];
+    LegacyEntryPoint32bit legacy_structure;
+};
+
+struct [[gnu::packed]] EntryPoint64bit {
+    char sig[5];
+    u8 checksum;
+    u8 length;
+    u8 major_version;
+    u8 minor_version;
+    u8 document_revision;
+    u8 revision;
+    u8 reserved;
+    u32 table_maximum_size;
+    u64 table_ptr;
+};
+}
+
+namespace Kernel {
+
+Memory::MappedROM map_bios();
+Memory::MappedROM map_ebda();
+
+class BIOSSysFSComponent : public SysFSComponent {
+public:
+    virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
+
+protected:
+    virtual KResultOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const = 0;
+    explicit BIOSSysFSComponent(String name);
+};
+
+class DMIEntryPointExposedBlob : public BIOSSysFSComponent {
+public:
+    static NonnullRefPtr<DMIEntryPointExposedBlob> create(PhysicalAddress dmi_entry_point, size_t blob_size);
+
+private:
+    DMIEntryPointExposedBlob(PhysicalAddress dmi_entry_point, size_t blob_size);
+    virtual KResultOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
+    PhysicalAddress m_dmi_entry_point;
+    size_t m_dmi_entry_point_length;
+};
+
+class SMBIOSExposedTable : public BIOSSysFSComponent {
+public:
+    static NonnullRefPtr<SMBIOSExposedTable> create(PhysicalAddress, size_t blob_size);
+
+private:
+    SMBIOSExposedTable(PhysicalAddress dmi_entry_point, size_t blob_size);
+    virtual KResultOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
+
+    PhysicalAddress m_smbios_structure_table;
+    size_t m_smbios_structure_table_length;
+};
+
+class BIOSSysFSDirectory : public SysFSDirectory {
+public:
+    static void initialize();
+
+    void create_components();
+
+private:
+    BIOSSysFSDirectory();
+
+    void set_dmi_64_bit_entry_initialization_values();
+    void set_dmi_32_bit_entry_initialization_values();
+    void initialize_dmi_exposer();
+
+    Optional<PhysicalAddress> find_dmi_entry64bit_point();
+    Optional<PhysicalAddress> find_dmi_entry32bit_point();
+
+    PhysicalAddress m_dmi_entry_point;
+    PhysicalAddress m_smbios_structure_table;
+    bool m_using_64bit_dmi_entry_point { false };
+    size_t m_smbios_structure_table_length { 0 };
+    size_t m_dmi_entry_point_length { 0 };
+};
+
+}