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/*
* 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/RefPtr.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <Kernel/FileSystem/SysFS.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/Directory.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 smbios_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 {
class BIOSSysFSComponent : public SysFSComponent {
public:
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override;
protected:
virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const = 0;
BIOSSysFSComponent();
};
class DMIEntryPointExposedBlob final : public BIOSSysFSComponent {
public:
virtual StringView name() const override { return "smbios_entry_point"sv; }
static NonnullRefPtr<DMIEntryPointExposedBlob> must_create(PhysicalAddress dmi_entry_point, size_t blob_size);
private:
DMIEntryPointExposedBlob(PhysicalAddress dmi_entry_point, size_t blob_size);
virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
virtual size_t size() const override { return m_dmi_entry_point_length; }
PhysicalAddress m_dmi_entry_point;
size_t const m_dmi_entry_point_length { 0 };
};
class SMBIOSExposedTable final : public BIOSSysFSComponent {
public:
virtual StringView name() const override { return "DMI"sv; }
static NonnullRefPtr<SMBIOSExposedTable> must_create(PhysicalAddress, size_t blob_size);
private:
SMBIOSExposedTable(PhysicalAddress dmi_entry_point, size_t blob_size);
virtual ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const override;
virtual size_t size() const override { return m_smbios_structure_table_length; }
PhysicalAddress m_smbios_structure_table;
size_t const m_smbios_structure_table_length { 0 };
};
class BIOSSysFSDirectory : public SysFSDirectory {
public:
virtual StringView name() const override { return "bios"sv; }
static NonnullRefPtr<BIOSSysFSDirectory> must_create(FirmwareSysFSDirectory&);
void create_components();
private:
explicit BIOSSysFSDirectory(FirmwareSysFSDirectory&);
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 };
};
}
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