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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <Kernel/ACPI/MultiProcessorParser.h>
#include <Kernel/Arch/PC/BIOS.h>
#include <Kernel/Debug.h>
#include <Kernel/Interrupts/IOAPIC.h>
#include <Kernel/Sections.h>
#include <Kernel/StdLib.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/TypedMapping.h>
namespace Kernel {
UNMAP_AFTER_INIT OwnPtr<MultiProcessorParser> MultiProcessorParser::autodetect()
{
auto floating_pointer = find_floating_pointer();
if (!floating_pointer.has_value())
return {};
auto parser = adopt_own_if_nonnull(new (nothrow) MultiProcessorParser(floating_pointer.value()));
VERIFY(parser != nullptr);
return parser;
}
UNMAP_AFTER_INIT MultiProcessorParser::MultiProcessorParser(PhysicalAddress floating_pointer)
: m_floating_pointer(floating_pointer)
{
dbgln("MultiProcessor: Floating Pointer Structure @ {}", m_floating_pointer);
parse_floating_pointer_data();
parse_configuration_table();
}
UNMAP_AFTER_INIT void MultiProcessorParser::parse_floating_pointer_data()
{
auto floating_pointer = map_typed<MultiProcessor::FloatingPointer>(m_floating_pointer);
m_configuration_table = PhysicalAddress(floating_pointer->physical_address_ptr);
dbgln("Features {}, IMCR? {}", floating_pointer->feature_info[0], (floating_pointer->feature_info[0] & (1 << 7)));
}
UNMAP_AFTER_INIT void MultiProcessorParser::parse_configuration_table()
{
auto configuration_table_length = map_typed<MultiProcessor::ConfigurationTableHeader>(m_configuration_table)->length;
auto config_table = map_typed<MultiProcessor::ConfigurationTableHeader>(m_configuration_table, configuration_table_length);
size_t entry_count = config_table->entry_count;
auto* entry = config_table->entries;
while (entry_count > 0) {
dbgln_if(MULTIPROCESSOR_DEBUG, "MultiProcessor: Entry Type {} detected.", entry->entry_type);
switch (entry->entry_type) {
case ((u8)MultiProcessor::ConfigurationTableEntryType::Processor):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::ProcessorEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::Bus):
m_bus_entries.append(*(const MultiProcessor::BusEntry*)entry);
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::BusEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::IOAPIC):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::IOAPICEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::IO_Interrupt_Assignment):
m_io_interrupt_assignment_entries.append(*(const MultiProcessor::IOInterruptAssignmentEntry*)entry);
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::IOInterruptAssignmentEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::Local_Interrupt_Assignment):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::LocalInterruptAssignmentEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::SystemAddressSpaceMapping):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::SystemAddressSpaceMappingEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::BusHierarchyDescriptor):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::BusHierarchyDescriptorEntry);
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::CompatibilityBusAddressSpaceModifier):
entry = (MultiProcessor::EntryHeader*)(FlatPtr)entry + sizeof(MultiProcessor::CompatibilityBusAddressSpaceModifierEntry);
break;
default:
VERIFY_NOT_REACHED();
}
--entry_count;
}
}
UNMAP_AFTER_INIT Optional<PhysicalAddress> MultiProcessorParser::find_floating_pointer()
{
StringView signature("_MP_");
auto mp_floating_pointer = map_ebda().find_chunk_starting_with(signature, 16);
if (mp_floating_pointer.has_value())
return mp_floating_pointer;
return map_bios().find_chunk_starting_with(signature, 16);
}
UNMAP_AFTER_INIT Vector<u8> MultiProcessorParser::get_pci_bus_ids() const
{
Vector<u8> pci_bus_ids;
for (auto& entry : m_bus_entries) {
if (!strncmp("PCI ", entry.bus_type, strlen("PCI ")))
pci_bus_ids.append(entry.bus_id);
}
return pci_bus_ids;
}
UNMAP_AFTER_INIT Vector<PCIInterruptOverrideMetadata> MultiProcessorParser::get_pci_interrupt_redirections()
{
dbgln("MultiProcessor: Get PCI IOAPIC redirections");
Vector<PCIInterruptOverrideMetadata> overrides;
auto pci_bus_ids = get_pci_bus_ids();
for (auto& entry : m_io_interrupt_assignment_entries) {
for (auto id : pci_bus_ids) {
if (id == entry.source_bus_id) {
dbgln("Interrupts: Bus {}, polarity {}, trigger mode {}, INT {}, IOAPIC {}, IOAPIC INTIN {}",
entry.source_bus_id,
entry.polarity,
entry.trigger_mode,
entry.source_bus_irq,
entry.destination_ioapic_id,
entry.destination_ioapic_intin_pin);
overrides.empend(
entry.source_bus_id,
entry.polarity,
entry.trigger_mode,
entry.source_bus_irq,
entry.destination_ioapic_id,
entry.destination_ioapic_intin_pin);
}
}
}
for (auto& override_metadata : overrides) {
dbgln("Interrupts: Bus {}, polarity {}, PCI device {}, trigger mode {}, INT {}, IOAPIC {}, IOAPIC INTIN {}",
override_metadata.bus(),
override_metadata.polarity(),
override_metadata.pci_device_number(),
override_metadata.trigger_mode(),
override_metadata.pci_interrupt_pin(),
override_metadata.ioapic_id(),
override_metadata.ioapic_interrupt_pin());
}
return overrides;
}
UNMAP_AFTER_INIT PCIInterruptOverrideMetadata::PCIInterruptOverrideMetadata(u8 bus_id, u8 polarity, u8 trigger_mode, u8 source_irq, u32 ioapic_id, u16 ioapic_int_pin)
: m_bus_id(bus_id)
, m_polarity(polarity)
, m_trigger_mode(trigger_mode)
, m_pci_interrupt_pin(source_irq & 0b11)
, m_pci_device_number((source_irq >> 2) & 0b11111)
, m_ioapic_id(ioapic_id)
, m_ioapic_interrupt_pin(ioapic_int_pin)
{
}
}
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