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b02ee664e7
To do this we also need to get rid of LockRefPtrs in the USB code as well. Most of the SysFS nodes are statically generated during boot and are not mutated afterwards. The same goes for general device code - once we generate the appropriate SysFS nodes, we almost never mutate the node pointers afterwards, making locking unnecessary.
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/FileSystem/OpenFileDescription.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/Component.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/DMI/Definitions.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/Directory.h>
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#include <Kernel/Firmware/BIOS.h>
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#include <Kernel/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 BIOSSysFSDirectory::set_dmi_64_bit_entry_initialization_values()
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{
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dbgln("BIOSSysFSDirectory: 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 BIOSSysFSDirectory::set_dmi_32_bit_entry_initialization_values()
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{
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dbgln("BIOSSysFSDirectory: 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<BIOSSysFSDirectory> BIOSSysFSDirectory::must_create(FirmwareSysFSDirectory& firmware_directory)
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{
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auto bios_directory = MUST(adopt_nonnull_ref_or_enomem(new (nothrow) BIOSSysFSDirectory(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 BIOSSysFSDirectory::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("BIOSSysFSDirectory: 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("BIOSSysFSDirectory: 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(BIOSSysFSComponent::must_create(BIOSSysFSComponent::Type::DMIEntryPoint, m_dmi_entry_point, m_dmi_entry_point_length));
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list.append(BIOSSysFSComponent::must_create(BIOSSysFSComponent::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 BIOSSysFSDirectory::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("BIOSSysFSDirectory: Data table @ {}", m_smbios_structure_table);
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}
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UNMAP_AFTER_INIT BIOSSysFSDirectory::BIOSSysFSDirectory(FirmwareSysFSDirectory& 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> BIOSSysFSDirectory::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> BIOSSysFSDirectory::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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