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Kernel: Move ACPI and BIOS code into the new Firmware directory

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This will somwhat help unify them also under the same SysFS directory in
the commit.
Also, it feels much more like this change reflects the reality that both
ACPI and the BIOS are part of the firmware on x86 computers.
This commit is contained in:
Liav A 2021-09-11 10:39:47 +03:00 • committed by Andreas Kling
parent a9ec98028b
commit 9132596b8e
21 changed files with 26 additions and 26 deletions
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183
Kernel/Firmware/BIOS.cpp Normal file
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/*
* 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;
}
}