mirror of
https://github.com/RGBCube/serenity
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ae2ec45e78
This is important for dmidecode because it does an fstat on the DMI blobs, trying to figure out their size. Because we already know the size of the blobs when creating the SysFS components, there's no performance penalty whatsoever, and this allows dmidecode to not use the /dev/mem device as a fallback.
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/RefPtr.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/Firmware/SysFSFirmware.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/Memory/MappedROM.h>
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#include <Kernel/Memory/Region.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/VirtualAddress.h>
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namespace Kernel::SMBIOS {
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struct [[gnu::packed]] LegacyEntryPoint32bit {
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char legacy_sig[5];
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u8 checksum2;
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u16 smbios_table_length;
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u32 smbios_table_ptr;
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u16 smbios_tables_count;
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u8 smbios_bcd_revision;
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};
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struct [[gnu::packed]] EntryPoint32bit {
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char sig[4];
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u8 checksum;
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u8 length;
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u8 major_version;
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u8 minor_version;
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u16 maximum_structure_size;
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u8 implementation_revision;
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char formatted_area[5];
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LegacyEntryPoint32bit legacy_structure;
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};
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struct [[gnu::packed]] EntryPoint64bit {
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char sig[5];
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u8 checksum;
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u8 length;
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u8 major_version;
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u8 minor_version;
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u8 document_revision;
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u8 revision;
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u8 reserved;
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u32 table_maximum_size;
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u64 table_ptr;
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};
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}
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namespace Kernel {
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ErrorOr<Memory::MappedROM> map_bios();
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ErrorOr<Memory::MappedROM> map_ebda();
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class BIOSSysFSComponent : public SysFSComponent {
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public:
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
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protected:
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virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const = 0;
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BIOSSysFSComponent();
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};
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class DMIEntryPointExposedBlob final : public BIOSSysFSComponent {
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public:
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virtual StringView name() const override { return "smbios_entry_point"sv; }
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static NonnullRefPtr<DMIEntryPointExposedBlob> must_create(PhysicalAddress dmi_entry_point, size_t blob_size);
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private:
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DMIEntryPointExposedBlob(PhysicalAddress dmi_entry_point, size_t blob_size);
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virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
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virtual size_t size() const override { return m_dmi_entry_point_length; }
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PhysicalAddress m_dmi_entry_point;
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size_t const m_dmi_entry_point_length { 0 };
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};
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class SMBIOSExposedTable final : public BIOSSysFSComponent {
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public:
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virtual StringView name() const override { return "DMI"sv; }
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static NonnullRefPtr<SMBIOSExposedTable> must_create(PhysicalAddress, size_t blob_size);
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private:
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SMBIOSExposedTable(PhysicalAddress dmi_entry_point, size_t blob_size);
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virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
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virtual size_t size() const override { return m_smbios_structure_table_length; }
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PhysicalAddress m_smbios_structure_table;
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size_t const m_smbios_structure_table_length { 0 };
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};
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class BIOSSysFSDirectory : public SysFSDirectory {
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public:
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virtual StringView name() const override { return "bios"sv; }
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static NonnullRefPtr<BIOSSysFSDirectory> must_create(FirmwareSysFSDirectory&);
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void create_components();
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private:
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explicit BIOSSysFSDirectory(FirmwareSysFSDirectory&);
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void set_dmi_64_bit_entry_initialization_values();
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void set_dmi_32_bit_entry_initialization_values();
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void initialize_dmi_exposer();
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Optional<PhysicalAddress> find_dmi_entry64bit_point();
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Optional<PhysicalAddress> find_dmi_entry32bit_point();
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PhysicalAddress m_dmi_entry_point;
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PhysicalAddress m_smbios_structure_table;
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bool m_using_64bit_dmi_entry_point { false };
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size_t m_smbios_structure_table_length { 0 };
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size_t m_dmi_entry_point_length { 0 };
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};
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}
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