mirror of
https://github.com/RGBCube/serenity
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d550b09871
All code that is related to PC BIOS should not be in the Kernel/Firmware directory as this directory is for abstracted and platform-agnostic code like ACPI (and device tree parsing in the future). This fixes a problem with the aarch64 architecure, as these machines don't have any PC-BIOS in them so actually trying to access these memory locations (EBDA, BIOS ROM) does not make any sense, as they're specific to x86 machines only.
113 lines
4.4 KiB
C++
113 lines
4.4 KiB
C++
/*
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* Copyright (c) 2022, 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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#include <AK/StringView.h>
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#include <Kernel/Arch/x86_64/Firmware/PCBIOS/DMI/Definitions.h>
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#include <Kernel/Arch/x86_64/Firmware/PCBIOS/Mapper.h>
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#include <Kernel/Arch/x86_64/Firmware/PCBIOS/SysFSComponent.h>
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#include <Kernel/Arch/x86_64/Firmware/PCBIOS/SysFSDirectory.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Library/KBufferBuilder.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/TypedMapping.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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#define SMBIOS_BASE_SEARCH_ADDR 0xf0000
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#define SMBIOS_END_SEARCH_ADDR 0xfffff
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#define SMBIOS_SEARCH_AREA_SIZE (SMBIOS_END_SEARCH_ADDR - SMBIOS_BASE_SEARCH_ADDR)
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UNMAP_AFTER_INIT void SysFSBIOSDirectory::set_dmi_64_bit_entry_initialization_values()
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{
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dbgln("SysFSBIOSDirectory: SMBIOS 64bit Entry point @ {}", m_dmi_entry_point);
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auto smbios_entry = Memory::map_typed<SMBIOS::EntryPoint64bit>(m_dmi_entry_point, SMBIOS_SEARCH_AREA_SIZE).release_value_but_fixme_should_propagate_errors();
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m_smbios_structure_table = PhysicalAddress(smbios_entry.ptr()->table_ptr);
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m_dmi_entry_point_length = smbios_entry.ptr()->length;
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m_smbios_structure_table_length = smbios_entry.ptr()->table_maximum_size;
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}
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UNMAP_AFTER_INIT void SysFSBIOSDirectory::set_dmi_32_bit_entry_initialization_values()
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{
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dbgln("SysFSBIOSDirectory: SMBIOS 32bit Entry point @ {}", m_dmi_entry_point);
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auto smbios_entry = Memory::map_typed<SMBIOS::EntryPoint32bit>(m_dmi_entry_point, SMBIOS_SEARCH_AREA_SIZE).release_value_but_fixme_should_propagate_errors();
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m_smbios_structure_table = PhysicalAddress(smbios_entry.ptr()->legacy_structure.smbios_table_ptr);
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m_dmi_entry_point_length = smbios_entry.ptr()->length;
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m_smbios_structure_table_length = smbios_entry.ptr()->legacy_structure.smbios_table_length;
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}
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UNMAP_AFTER_INIT NonnullRefPtr<SysFSBIOSDirectory> SysFSBIOSDirectory::must_create(SysFSFirmwareDirectory& firmware_directory)
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{
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auto bios_directory = MUST(adopt_nonnull_ref_or_enomem(new (nothrow) SysFSBIOSDirectory(firmware_directory)));
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bios_directory->create_components();
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return bios_directory;
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}
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void SysFSBIOSDirectory::create_components()
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{
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if (m_dmi_entry_point.is_null() || m_smbios_structure_table.is_null())
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return;
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if (m_dmi_entry_point_length == 0) {
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dbgln("SysFSBIOSDirectory: invalid dmi entry length");
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return;
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}
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if (m_smbios_structure_table_length == 0) {
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dbgln("SysFSBIOSDirectory: invalid smbios structure table length");
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return;
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}
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MUST(m_child_components.with([&](auto& list) -> ErrorOr<void> {
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list.append(SysFSPCBIOSComponent::must_create(SysFSPCBIOSComponent::Type::DMIEntryPoint, m_dmi_entry_point, m_dmi_entry_point_length));
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list.append(SysFSPCBIOSComponent::must_create(SysFSPCBIOSComponent::Type::SMBIOSTable, m_smbios_structure_table, m_smbios_structure_table_length));
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return {};
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}));
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}
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UNMAP_AFTER_INIT void SysFSBIOSDirectory::initialize_dmi_exposer()
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{
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VERIFY(!(m_dmi_entry_point.is_null()));
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if (m_using_64bit_dmi_entry_point) {
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set_dmi_64_bit_entry_initialization_values();
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} else {
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set_dmi_32_bit_entry_initialization_values();
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}
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dbgln("SysFSBIOSDirectory: Data table @ {}", m_smbios_structure_table);
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}
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UNMAP_AFTER_INIT SysFSBIOSDirectory::SysFSBIOSDirectory(SysFSFirmwareDirectory& firmware_directory)
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: SysFSDirectory(firmware_directory)
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{
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auto entry_32bit = find_dmi_entry32bit_point();
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if (entry_32bit.has_value()) {
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m_dmi_entry_point = entry_32bit.value();
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}
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auto entry_64bit = find_dmi_entry64bit_point();
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if (entry_64bit.has_value()) {
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m_dmi_entry_point = entry_64bit.value();
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m_using_64bit_dmi_entry_point = true;
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}
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if (m_dmi_entry_point.is_null())
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return;
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initialize_dmi_exposer();
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}
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UNMAP_AFTER_INIT Optional<PhysicalAddress> SysFSBIOSDirectory::find_dmi_entry64bit_point()
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{
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auto bios_or_error = map_bios();
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if (bios_or_error.is_error())
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return {};
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return bios_or_error.value().find_chunk_starting_with("_SM3_"sv, 16);
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}
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UNMAP_AFTER_INIT Optional<PhysicalAddress> SysFSBIOSDirectory::find_dmi_entry32bit_point()
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{
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auto bios_or_error = map_bios();
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if (bios_or_error.is_error())
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return {};
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return bios_or_error.value().find_chunk_starting_with("_SM_"sv, 16);
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}
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}
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