diff options
Diffstat (limited to 'Kernel/Firmware/BIOS.cpp')
| -rw-r--r-- | Kernel/Firmware/BIOS.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/Kernel/Firmware/BIOS.cpp b/Kernel/Firmware/BIOS.cpp new file mode 100644 index 0000000000..f0842c5e3e --- /dev/null +++ b/Kernel/Firmware/BIOS.cpp @@ -0,0 +1,183 @@ +/* + * Copyright (c) 2020, Andreas Kling <kling@serenityos.org> + * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il> + * + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include <AK/StringView.h> +#include <Kernel/FileSystem/OpenFileDescription.h> +#include <Kernel/Firmware/BIOS.h> +#include <Kernel/KBufferBuilder.h> +#include <Kernel/Memory/MemoryManager.h> +#include <Kernel/Memory/TypedMapping.h> +#include <Kernel/Sections.h> + +namespace Kernel { + +#define SMBIOS_BASE_SEARCH_ADDR 0xf0000 +#define SMBIOS_END_SEARCH_ADDR 0xfffff +#define SMBIOS_SEARCH_AREA_SIZE (SMBIOS_END_SEARCH_ADDR - SMBIOS_BASE_SEARCH_ADDR) + +UNMAP_AFTER_INIT NonnullRefPtr<DMIEntryPointExposedBlob> DMIEntryPointExposedBlob::create(PhysicalAddress dmi_entry_point, size_t blob_size) +{ + return adopt_ref(*new (nothrow) DMIEntryPointExposedBlob(dmi_entry_point, blob_size)); +} + +UNMAP_AFTER_INIT BIOSSysFSComponent::BIOSSysFSComponent(String name) + : SysFSComponent(name) +{ +} + +KResultOr<size_t> BIOSSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const +{ + auto blob = TRY(try_to_generate_buffer()); + + if ((size_t)offset >= blob->size()) + return KSuccess; + + ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count)); + TRY(buffer.write(blob->data() + offset, nread)); + return nread; +} + +UNMAP_AFTER_INIT DMIEntryPointExposedBlob::DMIEntryPointExposedBlob(PhysicalAddress dmi_entry_point, size_t blob_size) + : BIOSSysFSComponent("smbios_entry_point") + , m_dmi_entry_point(dmi_entry_point) + , m_dmi_entry_point_length(blob_size) +{ +} + +KResultOr<NonnullOwnPtr<KBuffer>> DMIEntryPointExposedBlob::try_to_generate_buffer() const +{ + auto dmi_blob = Memory::map_typed<u8>((m_dmi_entry_point), m_dmi_entry_point_length); + return KBuffer::try_create_with_bytes(Span<u8> { dmi_blob.ptr(), m_dmi_entry_point_length }); +} + +UNMAP_AFTER_INIT NonnullRefPtr<SMBIOSExposedTable> SMBIOSExposedTable::create(PhysicalAddress smbios_structure_table, size_t smbios_structure_table_length) +{ + return adopt_ref(*new (nothrow) SMBIOSExposedTable(smbios_structure_table, smbios_structure_table_length)); +} + +UNMAP_AFTER_INIT SMBIOSExposedTable::SMBIOSExposedTable(PhysicalAddress smbios_structure_table, size_t smbios_structure_table_length) + : BIOSSysFSComponent("DMI") + , m_smbios_structure_table(smbios_structure_table) + , m_smbios_structure_table_length(smbios_structure_table_length) +{ +} + +KResultOr<NonnullOwnPtr<KBuffer>> SMBIOSExposedTable::try_to_generate_buffer() const +{ + auto dmi_blob = Memory::map_typed<u8>((m_smbios_structure_table), m_smbios_structure_table_length); + return KBuffer::try_create_with_bytes(Span<u8> { dmi_blob.ptr(), m_smbios_structure_table_length }); +} + +UNMAP_AFTER_INIT void BIOSSysFSDirectory::set_dmi_64_bit_entry_initialization_values() +{ + dbgln("BIOSSysFSDirectory: SMBIOS 64bit Entry point @ {}", m_dmi_entry_point); + auto smbios_entry = Memory::map_typed<SMBIOS::EntryPoint64bit>(m_dmi_entry_point, SMBIOS_SEARCH_AREA_SIZE); + m_smbios_structure_table = PhysicalAddress(smbios_entry.ptr()->table_ptr); + m_dmi_entry_point_length = smbios_entry.ptr()->length; + m_smbios_structure_table_length = smbios_entry.ptr()->table_maximum_size; +} + +UNMAP_AFTER_INIT void BIOSSysFSDirectory::set_dmi_32_bit_entry_initialization_values() +{ + dbgln("BIOSSysFSDirectory: SMBIOS 32bit Entry point @ {}", m_dmi_entry_point); + auto smbios_entry = Memory::map_typed<SMBIOS::EntryPoint32bit>(m_dmi_entry_point, SMBIOS_SEARCH_AREA_SIZE); + m_smbios_structure_table = PhysicalAddress(smbios_entry.ptr()->legacy_structure.smbios_table_ptr); + m_dmi_entry_point_length = smbios_entry.ptr()->length; + m_smbios_structure_table_length = smbios_entry.ptr()->legacy_structure.smboios_table_length; +} + +UNMAP_AFTER_INIT void BIOSSysFSDirectory::initialize() +{ + auto bios_directory = adopt_ref(*new (nothrow) BIOSSysFSDirectory()); + SysFSComponentRegistry::the().register_new_component(bios_directory); + bios_directory->create_components(); +} + +void BIOSSysFSDirectory::create_components() +{ + if (m_dmi_entry_point.is_null() || m_smbios_structure_table.is_null()) + return; + if (m_dmi_entry_point_length == 0) { + dbgln("BIOSSysFSDirectory: invalid dmi entry length"); + return; + } + if (m_smbios_structure_table_length == 0) { + dbgln("BIOSSysFSDirectory: invalid smbios structure table length"); + return; + } + auto dmi_entry_point = DMIEntryPointExposedBlob::create(m_dmi_entry_point, m_dmi_entry_point_length); + m_components.append(dmi_entry_point); + auto smbios_table = SMBIOSExposedTable::create(m_smbios_structure_table, m_smbios_structure_table_length); + m_components.append(smbios_table); +} + +UNMAP_AFTER_INIT void BIOSSysFSDirectory::initialize_dmi_exposer() +{ + VERIFY(!(m_dmi_entry_point.is_null())); + if (m_using_64bit_dmi_entry_point) { + set_dmi_64_bit_entry_initialization_values(); + } else { + set_dmi_32_bit_entry_initialization_values(); + } + dbgln("BIOSSysFSDirectory: Data table @ {}", m_smbios_structure_table); +} + +UNMAP_AFTER_INIT BIOSSysFSDirectory::BIOSSysFSDirectory() + : SysFSDirectory("bios", SysFSComponentRegistry::the().root_directory()) +{ + auto entry_32bit = find_dmi_entry32bit_point(); + if (entry_32bit.has_value()) { + m_dmi_entry_point = entry_32bit.value(); + } + + auto entry_64bit = find_dmi_entry64bit_point(); + if (entry_64bit.has_value()) { + m_dmi_entry_point = entry_64bit.value(); + m_using_64bit_dmi_entry_point = true; + } + if (m_dmi_entry_point.is_null()) + return; + initialize_dmi_exposer(); +} + +UNMAP_AFTER_INIT Optional<PhysicalAddress> BIOSSysFSDirectory::find_dmi_entry64bit_point() +{ + return map_bios().find_chunk_starting_with("_SM3_", 16); +} + +UNMAP_AFTER_INIT Optional<PhysicalAddress> BIOSSysFSDirectory::find_dmi_entry32bit_point() +{ + return map_bios().find_chunk_starting_with("_SM_", 16); +} + +Memory::MappedROM map_bios() +{ + Memory::MappedROM mapping; + mapping.size = 128 * KiB; + mapping.paddr = PhysicalAddress(0xe0000); + mapping.region = MM.allocate_kernel_region(mapping.paddr, Memory::page_round_up(mapping.size), {}, Memory::Region::Access::Read).release_value(); + return mapping; +} + +Memory::MappedROM map_ebda() +{ + auto ebda_segment_ptr = Memory::map_typed<u16>(PhysicalAddress(0x40e)); + auto ebda_length_ptr_b0 = Memory::map_typed<u8>(PhysicalAddress(0x413)); + auto ebda_length_ptr_b1 = Memory::map_typed<u8>(PhysicalAddress(0x414)); + + PhysicalAddress ebda_paddr(*ebda_segment_ptr << 4); + size_t ebda_size = (*ebda_length_ptr_b1 << 8) | *ebda_length_ptr_b0; + + Memory::MappedROM mapping; + mapping.region = MM.allocate_kernel_region(ebda_paddr.page_base(), Memory::page_round_up(ebda_size), {}, Memory::Region::Access::Read).release_value(); + mapping.offset = ebda_paddr.offset_in_page(); + mapping.size = ebda_size; + mapping.paddr = ebda_paddr; + return mapping; +} + +} |