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110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/*
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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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#include <AK/Format.h>
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#include <AK/Singleton.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/PC/BIOS.h>
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#include <Kernel/DMI.h>
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#include <Kernel/StdLib.h>
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#include <Kernel/VM/MappedROM.h>
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#include <Kernel/VM/TypedMapping.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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AK::Singleton<DMIExpose> s_the;
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UNMAP_AFTER_INIT void DMIExpose::set_64_bit_entry_initialization_values()
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{
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dbgln("DMIExpose: SMBIOS 64bit Entry point @ {}", m_entry_point);
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auto smbios_entry = map_typed<SMBIOS::EntryPoint64bit>(m_entry_point, SMBIOS_SEARCH_AREA_SIZE);
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m_structure_table = PhysicalAddress(smbios_entry.ptr()->table_ptr);
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m_entry_point_length = smbios_entry.ptr()->length;
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m_structure_table_length = smbios_entry.ptr()->table_maximum_size;
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}
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UNMAP_AFTER_INIT void DMIExpose::set_32_bit_entry_initialization_values()
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{
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dbgln("DMIExpose: SMBIOS 32bit Entry point @ {}", m_entry_point);
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auto smbios_entry = map_typed<SMBIOS::EntryPoint32bit>(m_entry_point, SMBIOS_SEARCH_AREA_SIZE);
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m_structure_table = PhysicalAddress(smbios_entry.ptr()->legacy_structure.smbios_table_ptr);
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m_entry_point_length = smbios_entry.ptr()->length;
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m_structure_table_length = smbios_entry.ptr()->legacy_structure.smboios_table_length;
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}
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UNMAP_AFTER_INIT void DMIExpose::initialize()
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{
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s_the.ensure_instance();
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}
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DMIExpose& DMIExpose::the()
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{
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return *s_the;
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}
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size_t DMIExpose::entry_point_length() const
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{
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return m_entry_point_length;
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}
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size_t DMIExpose::structure_table_length() const
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{
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return m_structure_table_length;
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}
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UNMAP_AFTER_INIT void DMIExpose::initialize_exposer()
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{
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VERIFY(!(m_entry_point.is_null()));
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if (m_using_64bit_entry_point) {
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set_64_bit_entry_initialization_values();
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} else {
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set_32_bit_entry_initialization_values();
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}
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dbgln("DMIExpose: Data table @ {}", m_structure_table);
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}
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OwnPtr<KBuffer> DMIExpose::entry_point() const
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{
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auto dmi_blob = map_typed<u8>((m_entry_point), m_entry_point_length);
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return KBuffer::try_create_with_bytes(Span<u8> { dmi_blob.ptr(), m_entry_point_length });
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}
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OwnPtr<KBuffer> DMIExpose::structure_table() const
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{
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auto dmi_blob = map_typed<u8>(m_structure_table, m_structure_table_length);
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return KBuffer::try_create_with_bytes(Span<u8> { dmi_blob.ptr(), m_structure_table_length });
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}
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UNMAP_AFTER_INIT DMIExpose::DMIExpose()
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{
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auto entry_32bit = find_entry32bit_point();
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m_entry_point = entry_32bit.value();
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auto entry_64bit = find_entry64bit_point();
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if (entry_64bit.has_value()) {
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m_entry_point = entry_64bit.value();
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m_using_64bit_entry_point = true;
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}
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if (m_entry_point.is_null())
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return;
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m_available = true;
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initialize_exposer();
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}
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UNMAP_AFTER_INIT Optional<PhysicalAddress> DMIExpose::find_entry64bit_point()
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{
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return map_bios().find_chunk_starting_with("_SM3_", 16);
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}
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UNMAP_AFTER_INIT Optional<PhysicalAddress> DMIExpose::find_entry32bit_point()
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{
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return map_bios().find_chunk_starting_with("_SM_", 16);
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}
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}
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