mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 18:07:34 +00:00
Kernel: Don't use references or pointers to physical addresses
Now the ACPI & PCI code is more safer, because we don't use raw pointers or references to objects or data that are located in the physical address space, so an accidental dereference cannot happen easily. Instead, we use the PhysicalAddress class to represent those addresses.
This commit is contained in:
Liav A
Andreas Kling
parent
43d570a1e3
commit
85307dd26e
13 changed files with 91 additions and 102 deletions
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@ -33,7 +33,7 @@
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namespace Kernel {
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void ACPIStaticParser::initialize(ACPI_RAW::RSDPDescriptor20& rsdp)
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void ACPIStaticParser::initialize(PhysicalAddress rsdp)
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{
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if (!ACPIParser::is_initialized()) {
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new ACPIStaticParser(rsdp);
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@ -59,7 +59,7 @@ void ACPIStaticParser::locate_static_data()
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locate_all_aml_tables();
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}
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ACPI_RAW::SDTHeader* ACPIStaticParser::find_table(const char* sig)
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PhysicalAddress ACPIStaticParser::find_table(const char* sig)
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{
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Calling Find Table method!\n");
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@ -74,33 +74,34 @@ ACPI_RAW::SDTHeader* ACPIStaticParser::find_table(const char* sig)
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Found Table @ P 0x%x\n", physical_sdt_ptr);
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#endif
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return physical_sdt_ptr;
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return PhysicalAddress((uintptr_t)physical_sdt_ptr);
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}
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}
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return nullptr;
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return {};
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}
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void ACPIStaticParser::init_fadt()
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{
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kprintf("ACPI: Initializing Fixed ACPI data\n");
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kprintf("ACPI: Searching for the Fixed ACPI Data Table\n");
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ASSERT(find_table("FACP") != nullptr);
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auto* fadt_ptr = find_table("FACP");
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auto checkup_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((fadt_ptr))), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
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auto fadt = find_table("FACP");
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ASSERT(!fadt.is_null());
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auto checkup_region = MM.allocate_kernel_region(fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Checking FADT Length to choose the correct mapping size\n");
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#endif
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auto* sdt = (const ACPI_RAW::SDTHeader*)checkup_region->vaddr().offset(offset_in_page((fadt_ptr))).as_ptr();
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auto* sdt = (const ACPI_RAW::SDTHeader*)checkup_region->vaddr().offset(fadt.offset_in_page().get()).as_ptr();
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: FADT @ V 0x%x, P 0x%x\n", sdt, fadt_ptr);
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#endif
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u32 length = sdt->length;
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kprintf("ACPI: Fixed ACPI data, Revision %u\n", sdt->revision);
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auto fadt_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((fadt_ptr))), PAGE_ROUND_UP(length) + PAGE_SIZE, "ACPI Static Parser", Region::Access::Read);
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m_fadt = make<ACPI::FixedACPIData>(*(ACPI_RAW::FADT*)fadt_region->vaddr().offset(offset_in_page((fadt_ptr))).as_ptr());
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auto fadt_region = MM.allocate_kernel_region(fadt.page_base(), PAGE_ROUND_UP(length) + PAGE_SIZE, "ACPI Static Parser", Region::Access::Read);
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m_fadt = make<ACPI::FixedACPIData>(*(ACPI_RAW::FADT*)fadt_region->vaddr().offset(fadt.offset_in_page().get()).as_ptr());
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Finished to initialize Fixed ACPI data\n");
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#endif
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@ -139,25 +140,25 @@ inline bool validate_acpi_table(ACPI_RAW::SDTHeader& v_header, size_t length)
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return false;
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}
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size_t ACPIStaticParser::get_table_size(ACPI_RAW::SDTHeader& p_header)
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size_t ACPIStaticParser::get_table_size(PhysicalAddress table_header)
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{
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InterruptDisabler disabler;
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Checking SDT Length\n");
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#endif
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auto region = MM.allocate_kernel_region(PhysicalAddress((uintptr_t)&p_header).page_base(), (PAGE_SIZE * 2), "ACPI get_table_size()", Region::Access::Read);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)region->vaddr().offset(offset_in_page(&p_header)).as_ptr();
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auto region = MM.allocate_kernel_region(table_header.page_base(), (PAGE_SIZE * 2), "ACPI get_table_size()", Region::Access::Read);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)region->vaddr().offset(table_header.offset_in_page().get()).as_ptr();
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return sdt->length;
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}
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u8 ACPIStaticParser::get_table_revision(ACPI_RAW::SDTHeader& p_header)
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u8 ACPIStaticParser::get_table_revision(PhysicalAddress table_header)
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{
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InterruptDisabler disabler;
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Checking SDT Revision\n");
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#endif
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auto region = MM.allocate_kernel_region(PhysicalAddress((uintptr_t)&p_header).page_base(), (PAGE_SIZE * 2), "ACPI get_table_revision()", Region::Access::Read);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)region->vaddr().offset(offset_in_page(&p_header)).as_ptr();
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auto region = MM.allocate_kernel_region(table_header.page_base(), (PAGE_SIZE * 2), "ACPI get_table_revision()", Region::Access::Read);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)region->vaddr().offset(table_header.offset_in_page().get()).as_ptr();
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return sdt->revision;
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}
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@ -166,25 +167,18 @@ void ACPIStaticParser::initialize_main_system_description_table()
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: Checking Main SDT Length to choose the correct mapping size\n");
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#endif
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ASSERT(m_main_system_description_table != nullptr);
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u32 length;
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u8 revision;
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if (m_xsdt_supported) {
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length = get_table_size(*m_main_system_description_table);
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revision = get_table_revision(*m_main_system_description_table);
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} else {
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length = get_table_size(*m_main_system_description_table);
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revision = get_table_revision(*m_main_system_description_table);
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}
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ASSERT(!m_main_system_description_table.is_null());
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auto length = get_table_size(m_main_system_description_table);
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auto revision = get_table_revision(m_main_system_description_table);
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auto main_sdt_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of(m_main_system_description_table)), PAGE_ROUND_UP(length) + PAGE_SIZE, "ACPI Static Parser Initialization", Region::Access::Read, false, true);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)main_sdt_region->vaddr().offset(offset_in_page(m_main_system_description_table)).as_ptr();
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auto main_sdt_region = MM.allocate_kernel_region(m_main_system_description_table.page_base(), PAGE_ROUND_UP(length) + PAGE_SIZE, "ACPI Static Parser Initialization", Region::Access::Read, false, true);
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auto* sdt = (volatile ACPI_RAW::SDTHeader*)main_sdt_region->vaddr().offset(m_main_system_description_table.offset_in_page().get()).as_ptr();
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kprintf("ACPI: Main Description Table valid? 0x%x\n", validate_acpi_table(const_cast<ACPI_RAW::SDTHeader&>(*sdt), length));
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Vector<ACPI_RAW::SDTHeader*> sdt_pointers;
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if (m_xsdt_supported) {
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volatile auto* xsdt = (volatile ACPI_RAW::XSDT*)sdt;
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kprintf("ACPI: Using XSDT, Enumerating tables @ P 0x%x\n", m_main_system_description_table);
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kprintf("ACPI: Using XSDT, Enumerating tables @ P 0x%x\n", m_main_system_description_table.get());
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kprintf("ACPI: XSDT Revision %d, Total length - %u\n", revision, length);
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: XSDT pointer @ V 0x%x\n", xsdt);
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@ -197,7 +191,7 @@ void ACPIStaticParser::initialize_main_system_description_table()
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}
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} else {
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volatile auto* rsdt = (volatile ACPI_RAW::RSDT*)sdt;
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kprintf("ACPI: Using RSDT, Enumerating tables @ P 0x%x\n", m_main_system_description_table);
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kprintf("ACPI: Using RSDT, Enumerating tables @ P 0x%x\n", m_main_system_description_table.get());
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kprintf("ACPI: RSDT Revision %d, Total length - %u\n", revision, length);
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#ifdef ACPI_DEBUG
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dbgprintf("ACPI: RSDT pointer @ V 0x%x\n", rsdt);
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@ -214,8 +208,8 @@ void ACPIStaticParser::initialize_main_system_description_table()
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void ACPIStaticParser::locate_main_system_description_table()
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{
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auto rsdp_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)m_rsdp)), (PAGE_SIZE * 2), "ACPI Static Parser Initialization", Region::Access::Read, false, true);
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volatile auto* rsdp = (ACPI_RAW::RSDPDescriptor20*)rsdp_region->vaddr().offset(offset_in_page((u32)m_rsdp)).as_ptr();
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auto rsdp_region = MM.allocate_kernel_region(m_rsdp.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser Initialization", Region::Access::Read, false, true);
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volatile auto* rsdp = (ACPI_RAW::RSDPDescriptor20*)rsdp_region->vaddr().offset(m_rsdp.offset_in_page().get()).as_ptr();
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if (rsdp->base.revision == 0) {
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m_xsdt_supported = false;
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} else if (rsdp->base.revision >= 2) {
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@ -226,9 +220,9 @@ void ACPIStaticParser::locate_main_system_description_table()
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}
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}
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if (!m_xsdt_supported) {
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m_main_system_description_table = (ACPI_RAW::SDTHeader*)rsdp->base.rsdt_ptr;
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m_main_system_description_table = PhysicalAddress(rsdp->base.rsdt_ptr);
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} else {
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m_main_system_description_table = (ACPI_RAW::SDTHeader*)rsdp->xsdt_ptr;
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m_main_system_description_table = PhysicalAddress(rsdp->xsdt_ptr);
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}
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}
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@ -254,12 +248,11 @@ void ACPIStaticParser::locate_all_aml_tables()
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ACPIStaticParser::ACPIStaticParser()
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: ACPIParser(true)
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, m_rsdp(nullptr)
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, m_rsdp(search_rsdp())
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, m_main_sdt(nullptr)
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, m_fadt(nullptr)
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{
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m_rsdp = search_rsdp();
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if (m_rsdp != nullptr) {
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if (!m_rsdp.is_null()) {
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kprintf("ACPI: Using RSDP @ P 0x%x\n", m_rsdp);
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m_operable = true;
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locate_static_data();
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@ -269,7 +262,7 @@ ACPIStaticParser::ACPIStaticParser()
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}
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}
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ACPI_RAW::RSDPDescriptor20* ACPIStaticParser::search_rsdp_in_ebda(u16 ebda_segment)
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PhysicalAddress ACPIStaticParser::search_rsdp_in_ebda(u16 ebda_segment)
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{
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auto rsdp_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)(ebda_segment << 4))), PAGE_ROUND_UP(1024), "ACPI Static Parser RSDP Finding #1", Region::Access::Read, false, true);
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char* p_rsdp_str = (char*)(PhysicalAddress(ebda_segment << 4).as_ptr());
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@ -278,13 +271,13 @@ ACPI_RAW::RSDPDescriptor20* ACPIStaticParser::search_rsdp_in_ebda(u16 ebda_segme
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dbgprintf("ACPI: Looking for RSDP in EBDA @ V0x%x, P0x%x\n", rsdp_str, p_rsdp_str);
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#endif
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if (!strncmp("RSD PTR ", rsdp_str, strlen("RSD PTR ")))
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return (ACPI_RAW::RSDPDescriptor20*)p_rsdp_str;
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return PhysicalAddress((uintptr_t)p_rsdp_str);
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p_rsdp_str += 16;
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}
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return nullptr;
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return {};
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}
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ACPI_RAW::RSDPDescriptor20* ACPIStaticParser::search_rsdp_in_bios_area()
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PhysicalAddress ACPIStaticParser::search_rsdp_in_bios_area()
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{
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auto rsdp_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)0xE0000)), PAGE_ROUND_UP(0xFFFFF - 0xE0000), "ACPI Static Parser RSDP Finding #2", Region::Access::Read, false, true);
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char* p_rsdp_str = (char*)(PhysicalAddress(0xE0000).as_ptr());
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@ -293,32 +286,32 @@ ACPI_RAW::RSDPDescriptor20* ACPIStaticParser::search_rsdp_in_bios_area()
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dbgprintf("ACPI: Looking for RSDP in BIOS area @ V0x%x, P0x%x\n", rsdp_str, p_rsdp_str);
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#endif
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if (!strncmp("RSD PTR ", rsdp_str, strlen("RSD PTR ")))
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return (ACPI_RAW::RSDPDescriptor20*)p_rsdp_str;
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return PhysicalAddress((uintptr_t)p_rsdp_str);
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p_rsdp_str += 16;
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}
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return nullptr;
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return {};
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}
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ACPI_RAW::RSDPDescriptor20* ACPIStaticParser::search_rsdp()
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PhysicalAddress ACPIStaticParser::search_rsdp()
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{
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ACPI_RAW::RSDPDescriptor20* rsdp = nullptr;
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PhysicalAddress rsdp;
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auto region = MM.allocate_kernel_region(PhysicalAddress(0), PAGE_SIZE, "ACPI Static Parser RSDP Finding", Region::Access::Read);
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u16 ebda_seg = (u16) * ((uint16_t*)((region->vaddr().get() & PAGE_MASK) + 0x40e));
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kprintf("ACPI: Probing EBDA, Segment 0x%x\n", ebda_seg);
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rsdp = search_rsdp_in_ebda(ebda_seg);
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if (rsdp != nullptr)
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if (!rsdp.is_null())
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return rsdp;
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return search_rsdp_in_bios_area();
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}
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ACPIStaticParser::ACPIStaticParser(ACPI_RAW::RSDPDescriptor20& rsdp)
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ACPIStaticParser::ACPIStaticParser(PhysicalAddress rsdp)
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: ACPIParser(true)
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, m_rsdp(&rsdp)
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, m_rsdp(rsdp)
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, m_main_sdt(nullptr)
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, m_fadt(nullptr)
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{
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kprintf("ACPI: Using RSDP @ Px%x\n", &rsdp);
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kprintf("ACPI: Using RSDP @ Px%x\n", rsdp.get());
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m_operable = true;
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locate_static_data();
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}
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