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Kernel: DMIDecoder no longer depends on identity-mapping

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DMIDecoder creates the mappings using the standard helpers, thus no
need to rely on the identity mapping in the first 1MB in memory.
This commit is contained in:
Liav A 2020-01-21 04:35:57 +02:00 • committed by Andreas Kling
parent aca317d889
commit 325022cbd7
2 changed files with 37 additions and 15 deletions
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49
Kernel/ACPI/DMIDecoder.cpp
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@ -58,23 +58,40 @@ void DMIDecoder::initialize_untrusted()
}
}
void DMIDecoder::set_64_bit_entry_initialization_values(SMBIOS::EntryPoint64bit& entry)
{
kprintf("DMIDecoder: SMBIOS 64bit Entry point @ P 0x%x\n", m_entry64bit_point);
m_use_64bit_entry = true;
auto region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)&entry)), PAGE_ROUND_UP(SMBIOS_SEARCH_AREA_SIZE), "DMI Decoder 64 bit Initialization", Region::Access::Read, false, false);
auto& entry_ptr = *(SMBIOS::EntryPoint64bit*)region->vaddr().offset(offset_in_page((u32)&entry)).as_ptr();
m_structure_table = (SMBIOS::TableHeader*)entry_ptr.table_ptr;
m_structures_count = entry_ptr.table_maximum_size;
m_table_length = entry_ptr.table_maximum_size;
}
void DMIDecoder::set_32_bit_entry_initialization_values(SMBIOS::EntryPoint32bit& entry)
{
kprintf("DMIDecoder: SMBIOS 32bit Entry point @ P 0x%x\n", m_entry32bit_point);
m_use_64bit_entry = false;
auto region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)&entry)), PAGE_ROUND_UP(SMBIOS_SEARCH_AREA_SIZE), "DMI Decoder 32 bit Initialization", Region::Access::Read, false, false);
auto& entry_ptr = *(SMBIOS::EntryPoint32bit*)region->vaddr().offset(offset_in_page((u32)&entry)).as_ptr();
m_structure_table = (SMBIOS::TableHeader*)entry_ptr.legacy_structure.smbios_table_ptr;
m_structures_count = entry_ptr.legacy_structure.smbios_tables_count;
m_table_length = entry_ptr.legacy_structure.smboios_table_length;
}
void DMIDecoder::initialize_parser()
{
if (m_entry32bit_point != nullptr || m_entry64bit_point != nullptr) {
m_operable = true;
kprintf("DMI Decoder is enabled\n");
if (m_entry64bit_point != nullptr) {
kprintf("DMIDecoder: SMBIOS 64bit Entry point @ P 0x%x\n", m_entry64bit_point);
m_use_64bit_entry = true;
m_structure_table = (SMBIOS::TableHeader*)m_entry64bit_point->table_ptr;
m_structures_count = m_entry64bit_point->table_maximum_size;
m_table_length = m_entry64bit_point->table_maximum_size;
set_64_bit_entry_initialization_values(*m_entry64bit_point);
} else if (m_entry32bit_point != nullptr) {
kprintf("DMIDecoder: SMBIOS 32bit Entry point @ P 0x%x\n", m_entry32bit_point);
m_use_64bit_entry = false;
m_structure_table = (SMBIOS::TableHeader*)m_entry32bit_point->legacy_structure.smbios_table_ptr;
m_structures_count = m_entry32bit_point->legacy_structure.smbios_tables_count;
m_table_length = m_entry32bit_point->legacy_structure.smboios_table_length;
set_32_bit_entry_initialization_values(*m_entry32bit_point);
}
kprintf("DMIDecoder: Data table @ P 0x%x\n", m_structure_table);
enumerate_smbios_tables();
@ -126,11 +143,12 @@ void DMIDecoder::enumerate_smbios_tables()
size_t DMIDecoder::get_table_size(SMBIOS::TableHeader& table)
{
// FIXME: Make sure we have some mapping here so we don't rely on existing identity mapping...
auto region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)&table)), PAGE_ROUND_UP(m_table_length), "DMI Decoder Determining table size", Region::Access::Read, false, false);
auto& table_v_ptr = (SMBIOS::TableHeader&)*region->vaddr().offset(offset_in_page((u32)&table)).as_ptr();
#ifdef SMBIOS_DEBUG
dbgprintf("DMIDecoder: table legnth - 0x%x\n", table.length);
dbgprintf("DMIDecoder: table legnth - 0x%x\n", table_v_ptr.length);
#endif
const char* strtab = (char*)&table + table.length;
const char* strtab = (char*)&table_v_ptr + table_v_ptr.length;
size_t index = 1;
while (strtab[index - 1] != '\0' || strtab[index] != '\0') {
if (index > m_table_length) {
@ -139,9 +157,9 @@ size_t DMIDecoder::get_table_size(SMBIOS::TableHeader& table)
index++;
}
#ifdef SMBIOS_DEBUG
dbgprintf("DMIDecoder: table size - 0x%x\n", table.length + index + 1);
dbgprintf("DMIDecoder: table size - 0x%x\n", table_v_ptr.length + index + 1);
#endif
return table.length + index + 1;
return table_v_ptr.length + index + 1;
}
SMBIOS::TableHeader* DMIDecoder::get_next_physical_table(SMBIOS::TableHeader& p_table)
@ -243,6 +261,7 @@ u64 DMIDecoder::get_bios_characteristics()
ASSERT(m_operable == true);
SMBIOS::BIOSInfo* bios_info = (SMBIOS::BIOSInfo*)get_smbios_physical_table_by_type(0);
ASSERT(bios_info != nullptr);
kprintf("DMIDecoder: BIOS info @ P 0x%x\n", bios_info);
return bios_info->bios_characteristics;
}