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Kernel/SysFS: Split the bulky BIOS.h file into multiple files

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Liav A 2022-04-22 10:59:32 +03:00 • committed by Andreas Kling
parent 9c6834698f
commit 4d05a41b30
Notes: sideshowbarker 2024-07-17 10:07:42 +09:00
12 changed files with 297 additions and 180 deletions
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161
Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS.cpp
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@ -1,161 +0,0 @@
/*
* 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/FileSystem/SysFS/Subsystems/Firmware/BIOS.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::must_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()
{
}
ErrorOr<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 0;
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()
, m_dmi_entry_point(dmi_entry_point)
, m_dmi_entry_point_length(blob_size)
{
}
ErrorOr<NonnullOwnPtr<KBuffer>> DMIEntryPointExposedBlob::try_to_generate_buffer() const
{
auto dmi_blob = TRY(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::must_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()
, m_smbios_structure_table(smbios_structure_table)
, m_smbios_structure_table_length(smbios_structure_table_length)
{
}
ErrorOr<NonnullOwnPtr<KBuffer>> SMBIOSExposedTable::try_to_generate_buffer() const
{
auto dmi_blob = TRY(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).release_value_but_fixme_should_propagate_errors();
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).release_value_but_fixme_should_propagate_errors();
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.smbios_table_length;
}
UNMAP_AFTER_INIT NonnullRefPtr<BIOSSysFSDirectory> BIOSSysFSDirectory::must_create(FirmwareSysFSDirectory& firmware_directory)
{
auto bios_directory = MUST(adopt_nonnull_ref_or_enomem(new (nothrow) BIOSSysFSDirectory(firmware_directory)));
bios_directory->create_components();
return bios_directory;
}
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;
}
m_components.append(DMIEntryPointExposedBlob::must_create(m_dmi_entry_point, m_dmi_entry_point_length));
m_components.append(SMBIOSExposedTable::must_create(m_smbios_structure_table, m_smbios_structure_table_length));
}
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(FirmwareSysFSDirectory& firmware_directory)
: SysFSDirectory(firmware_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()
{
auto bios_or_error = map_bios();
if (bios_or_error.is_error())
return {};
return bios_or_error.value().find_chunk_starting_with("_SM3_", 16);
}
UNMAP_AFTER_INIT Optional<PhysicalAddress> BIOSSysFSDirectory::find_dmi_entry32bit_point()
{
auto bios_or_error = map_bios();
if (bios_or_error.is_error())
return {};
return bios_or_error.value().find_chunk_starting_with("_SM_", 16);
}
}