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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/Arch/PC/BIOS.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/Sections.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/TypedMapping.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 BIOSExposedComponent::BIOSExposedComponent(String name)
: SysFSComponent(name)
{
}
KResultOr<size_t> BIOSExposedComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription*) const
{
auto blob = try_to_generate_buffer();
if (!blob)
return KResult(EFAULT);
if ((size_t)offset >= blob->size())
return KSuccess;
ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
if (!buffer.write(blob->data() + offset, nread))
return KResult(EFAULT);
return nread;
}
UNMAP_AFTER_INIT DMIEntryPointExposedBlob::DMIEntryPointExposedBlob(PhysicalAddress dmi_entry_point, size_t blob_size)
: BIOSExposedComponent("smbios_entry_point")
, m_dmi_entry_point(dmi_entry_point)
, m_dmi_entry_point_length(blob_size)
{
}
OwnPtr<KBuffer> DMIEntryPointExposedBlob::try_to_generate_buffer() const
{
auto dmi_blob = 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)
: BIOSExposedComponent("DMI")
, m_smbios_structure_table(smbios_structure_table)
, m_smbios_structure_table_length(smbios_structure_table_length)
{
}
OwnPtr<KBuffer> SMBIOSExposedTable::try_to_generate_buffer() const
{
auto dmi_blob = 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 BIOSExposedFolder::set_dmi_64_bit_entry_initialization_values()
{
dbgln("BIOSExposedFolder: SMBIOS 64bit Entry point @ {}", m_dmi_entry_point);
auto smbios_entry = 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 BIOSExposedFolder::set_dmi_32_bit_entry_initialization_values()
{
dbgln("BIOSExposedFolder: SMBIOS 32bit Entry point @ {}", m_dmi_entry_point);
auto smbios_entry = 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 BIOSExposedFolder::initialize()
{
auto bios_folder = adopt_ref(*new (nothrow) BIOSExposedFolder());
SysFSComponentRegistry::the().register_new_component(bios_folder);
bios_folder->create_components();
}
void BIOSExposedFolder::create_components()
{
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);
}
size_t BIOSExposedFolder::dmi_entry_point_length() const
{
return m_dmi_entry_point_length;
}
size_t BIOSExposedFolder::smbios_structure_table_length() const
{
return m_smbios_structure_table_length;
}
UNMAP_AFTER_INIT void BIOSExposedFolder::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("BIOSExposedFolder: Data table @ {}", m_smbios_structure_table);
}
OwnPtr<KBuffer> BIOSExposedFolder::smbios_structure_table() const
{
auto dmi_blob = 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 BIOSExposedFolder::BIOSExposedFolder()
: SystemExposedFolder("bios", SysFSComponentRegistry::the().root_folder())
{
auto entry_32bit = find_dmi_entry32bit_point();
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> BIOSExposedFolder::find_dmi_entry64bit_point()
{
return map_bios().find_chunk_starting_with("_SM3_", 16);
}
UNMAP_AFTER_INIT Optional<PhysicalAddress> BIOSExposedFolder::find_dmi_entry32bit_point()
{
return map_bios().find_chunk_starting_with("_SM_", 16);
}
MappedROM map_bios()
{
MappedROM mapping;
mapping.size = 128 * KiB;
mapping.paddr = PhysicalAddress(0xe0000);
mapping.region = MM.allocate_kernel_region(mapping.paddr, page_round_up(mapping.size), {}, Region::Access::Read);
return mapping;
}
MappedROM map_ebda()
{
auto ebda_segment_ptr = map_typed<u16>(PhysicalAddress(0x40e));
auto ebda_length_ptr_b0 = map_typed<u8>(PhysicalAddress(0x413));
auto ebda_length_ptr_b1 = 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;
MappedROM mapping;
mapping.region = MM.allocate_kernel_region(ebda_paddr.page_base(), page_round_up(ebda_size), {}, Region::Access::Read);
mapping.offset = ebda_paddr.offset_in_page();
mapping.size = ebda_size;
mapping.paddr = ebda_paddr;
return mapping;
}
}
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