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Kernel: Clean up and simplify MP table parsing

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Use map_typed<T> to map physically addressed structs into kernel VM.
This is so much easier than doing address arithmetic everywhere. :^)
This commit is contained in:
Andreas Kling 2020-05-22 12:01:01 +02:00
parent c35732c011
commit 6b5d2afd00
Notes: sideshowbarker 2024-07-19 06:15:50 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/6b5d2afd007
2 changed files with 47 additions and 76 deletions
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100
Kernel/ACPI/MultiProcessorParser.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -27,8 +28,9 @@
#include <AK/StringView.h>
#include <Kernel/ACPI/MultiProcessorParser.h>
#include <Kernel/Interrupts/IOAPIC.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/StdLib.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/TypedMapping.h>
//#define MULTIPROCESSOR_DEBUG
@ -49,9 +51,8 @@ void MultiProcessorParser::initialize()
MultiProcessorParser::MultiProcessorParser()
: m_floating_pointer(search_floating_pointer())
, m_operable((m_floating_pointer != (FlatPtr) nullptr))
{
if (m_floating_pointer != (FlatPtr) nullptr) {
if (!m_floating_pointer.is_null()) {
klog() << "MultiProcessor: Floating Pointer Structure @ " << PhysicalAddress(m_floating_pointer);
parse_floating_pointer_data();
parse_configuration_table();
@ -62,29 +63,18 @@ MultiProcessorParser::MultiProcessorParser()
void MultiProcessorParser::parse_floating_pointer_data()
{
auto floating_pointer_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)m_floating_pointer)), PAGE_SIZE * 2, "MultiProcessor Parser Parsing Floating Pointer Structure", Region::Access::Read, false, true);
auto* floating_pointer = (MultiProcessor::FloatingPointer*)floating_pointer_region->vaddr().offset(offset_in_page((u32)m_floating_pointer)).as_ptr();
m_configuration_table = floating_pointer->physical_address_ptr;
m_specification_revision = floating_pointer->specification_revision;
auto floating_pointer = map_typed<MultiProcessor::FloatingPointer>(m_floating_pointer);
m_configuration_table = PhysicalAddress(floating_pointer->physical_address_ptr);
dbg() << "Features " << floating_pointer->feature_info[0] << ", IMCR? " << (floating_pointer->feature_info[0] & (1 << 7));
}
size_t MultiProcessorParser::get_configuration_table_length()
{
auto config_table_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)m_configuration_table)), PAGE_SIZE * 2, "MultiProcessor Parser Getting Configuration Table length", Region::Access::Read, false, true);
auto* config_table = (MultiProcessor::ConfigurationTableHeader*)config_table_region->vaddr().offset(offset_in_page((u32)m_configuration_table)).as_ptr();
return config_table->length;
}
void MultiProcessorParser::parse_configuration_table()
{
m_configuration_table_length = get_configuration_table_length();
auto config_table_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)m_configuration_table)), PAGE_ROUND_UP(m_configuration_table_length), "MultiProcessor Parser Parsing Configuration Table", Region::Access::Read, false, true);
auto* config_table = (MultiProcessor::ConfigurationTableHeader*)config_table_region->vaddr().offset(offset_in_page((u32)m_configuration_table)).as_ptr();
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;
auto* p_entry = reinterpret_cast<MultiProcessor::ConfigurationTableHeader*>(m_configuration_table)->entries;
while (entry_count > 0) {
#ifdef MULTIPROCESSOR_DEBUG
dbg() << "MultiProcessor: Entry Type " << entry->entry_type << " detected.";
@ -92,94 +82,85 @@ void MultiProcessorParser::parse_configuration_table()
switch (entry->entry_type) {
case ((u8)MultiProcessor::ConfigurationTableEntryType::Processor):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Processor;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Processor;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::Bus):
m_bus_entries.append((FlatPtr)p_entry);
m_bus_entries.append(*(const MultiProcessor::BusEntry*)entry);
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Bus;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Bus;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::IOAPIC):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::IOAPIC;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::IOAPIC;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::IO_Interrupt_Assignment):
m_io_interrupt_redirection_entries.append((FlatPtr)p_entry);
m_io_interrupt_assignment_entries.append(*(const MultiProcessor::IOInterruptAssignmentEntry*)entry);
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::IO_Interrupt_Assignment;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::IO_Interrupt_Assignment;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::Local_Interrupt_Assignment):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Local_Interrupt_Assignment;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::Local_Interrupt_Assignment;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::SystemAddressSpaceMapping):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::SystemAddressSpaceMapping;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::SystemAddressSpaceMapping;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::BusHierarchyDescriptor):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::BusHierarchyDescriptor;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::BusHierarchyDescriptor;
break;
case ((u8)MultiProcessor::ConfigurationTableEntryType::CompatibilityBusAddressSpaceModifier):
entry = (MultiProcessor::EntryHeader*)(u32)entry + (u8)MultiProcessor::ConfigurationTableEntryLength::CompatibilityBusAddressSpaceModifier;
p_entry = (MultiProcessor::EntryHeader*)(u32)p_entry + (u8)MultiProcessor::ConfigurationTableEntryLength::CompatibilityBusAddressSpaceModifier;
break;
default:
ASSERT_NOT_REACHED();
}
entry_count--;
--entry_count;
}
}
FlatPtr MultiProcessorParser::search_floating_pointer()
PhysicalAddress MultiProcessorParser::search_floating_pointer()
{
FlatPtr mp_floating_pointer = (FlatPtr) nullptr;
PhysicalAddress mp_floating_pointer;
auto region = MM.allocate_kernel_region(PhysicalAddress(0), PAGE_SIZE, "MultiProcessor Parser Floating Pointer Structure Finding", Region::Access::Read);
u16 ebda_seg = (u16) * ((uint16_t*)((region->vaddr().get() & PAGE_MASK) + 0x40e));
klog() << "MultiProcessor: Probing EBDA, Segment 0x" << String::format("%x", ebda_seg);
mp_floating_pointer = search_floating_pointer_in_ebda(ebda_seg);
if (mp_floating_pointer != (FlatPtr) nullptr)
if (!mp_floating_pointer.is_null())
return mp_floating_pointer;
return search_floating_pointer_in_bios_area();
}
FlatPtr MultiProcessorParser::search_floating_pointer_in_ebda(u16 ebda_segment)
PhysicalAddress MultiProcessorParser::search_floating_pointer_in_ebda(u16 ebda_segment)
{
auto floating_pointer_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)(ebda_segment << 4))), PAGE_ROUND_UP(1024), "MultiProcessor Parser floating_pointer Finding #1", Region::Access::Read, false, true);
char* p_floating_pointer_str = (char*)(PhysicalAddress(ebda_segment << 4).as_ptr());
for (char* floating_pointer_str = (char*)floating_pointer_region->vaddr().offset(offset_in_page((u32)(ebda_segment << 4))).as_ptr(); floating_pointer_str < (char*)(floating_pointer_region->vaddr().offset(offset_in_page((u32)(ebda_segment << 4))).get() + 1024); floating_pointer_str += 16) {
#ifdef MULTIPROCESSOR_DEBUG
dbg() << "MultiProcessor: Looking for floating pointer structure in EBDA @ V0x " << String::format("%x", floating_pointer_str) << ", P0x" << String::format("%x", p_floating_pointer_str);
//dbg() << "MultiProcessor: Looking for floating pointer structure in EBDA @ V0x " << String::format("%x", floating_pointer_str) << ", P0x" << String::format("%x", p_floating_pointer_str);
#endif
if (!strncmp("_MP_", floating_pointer_str, strlen("_MP_")))
return (FlatPtr)p_floating_pointer_str;
return PhysicalAddress((FlatPtr)p_floating_pointer_str);
p_floating_pointer_str += 16;
}
return (FlatPtr) nullptr;
return {};
}
FlatPtr MultiProcessorParser::search_floating_pointer_in_bios_area()
PhysicalAddress MultiProcessorParser::search_floating_pointer_in_bios_area()
{
auto floating_pointer_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)0xE0000)), PAGE_ROUND_UP(0xFFFFF - 0xE0000), "MultiProcessor Parser floating_pointer Finding #2", Region::Access::Read, false, true);
char* p_floating_pointer_str = (char*)(PhysicalAddress(0xE0000).as_ptr());
for (char* floating_pointer_str = (char*)floating_pointer_region->vaddr().offset(offset_in_page((u32)(0xE0000))).as_ptr(); floating_pointer_str < (char*)(floating_pointer_region->vaddr().offset(offset_in_page((u32)(0xE0000))).get() + (0xFFFFF - 0xE0000)); floating_pointer_str += 16) {
#ifdef MULTIPROCESSOR_DEBUG
dbg() << "MultiProcessor: Looking for floating pointer structure in BIOS area @ V0x " << String::format("%x", floating_pointer_str) << ", P0x" << String::format("%x", p_floating_pointer_str);
//dbg() << "MultiProcessor: Looking for floating pointer structure in BIOS area @ V0x " << String::format("%x", floating_pointer_str) << ", P0x" << String::format("%x", p_floating_pointer_str);
#endif
if (!strncmp("_MP_", floating_pointer_str, strlen("_MP_")))
return (FlatPtr)p_floating_pointer_str;
return PhysicalAddress((FlatPtr)p_floating_pointer_str);
p_floating_pointer_str += 16;
}
return (FlatPtr) nullptr;
return {};
}
Vector<unsigned> MultiProcessorParser::get_pci_bus_ids()
Vector<u8> MultiProcessorParser::get_pci_bus_ids() const
{
Vector<unsigned> pci_bus_ids;
for (auto entry : m_bus_entries) {
auto entry_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)entry)), PAGE_ROUND_UP(m_configuration_table_length), "MultiProcessor Parser Parsing Bus Entry", Region::Access::Read, false, true);
auto* v_entry_ptr = (MultiProcessor::BusEntry*)entry_region->vaddr().offset(offset_in_page((u32)entry)).as_ptr();
if (!strncmp("PCI ", v_entry_ptr->bus_type, strlen("PCI ")))
pci_bus_ids.append(v_entry_ptr->bus_id);
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;
}
@ -194,24 +175,19 @@ Vector<PCIInterruptOverrideMetadata> MultiProcessorParser::get_pci_interrupt_red
{
dbg() << "MultiProcessor: Get PCI IOAPIC redirections";
Vector<PCIInterruptOverrideMetadata> overrides;
Vector<unsigned> pci_bus_ids = get_pci_bus_ids();
for (auto entry : m_io_interrupt_redirection_entries) {
auto entry_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)entry)), PAGE_ROUND_UP(m_configuration_table_length), "MultiProcessor Parser Parsing Bus Entry", Region::Access::Read, false, true);
auto* v_entry_ptr = (MultiProcessor::IOInterruptAssignmentEntry*)entry_region->vaddr().offset(offset_in_page((u32)entry)).as_ptr();
#ifdef MULTIPROCESSOR_DEBUG
dbg() << "MultiProcessor: Parsing Entry P 0x" << String::format("%x", entry) << ", V " << v_entry_ptr;
#endif
auto pci_bus_ids = get_pci_bus_ids();
for (auto& entry : m_io_interrupt_assignment_entries) {
for (auto id : pci_bus_ids) {
if (id == v_entry_ptr->source_bus_id) {
if (id == entry.source_bus_id) {
klog() << "Interrupts: Bus " << v_entry_ptr->source_bus_id << ", Polarity " << v_entry_ptr->polarity << ", Trigger Mode " << v_entry_ptr->trigger_mode << ", INT " << v_entry_ptr->source_bus_irq << ", IOAPIC " << v_entry_ptr->destination_ioapic_id << ", IOAPIC INTIN " << v_entry_ptr->destination_ioapic_intin_pin;
klog() << "Interrupts: Bus " << entry.source_bus_id << ", Polarity " << entry.polarity << ", Trigger Mode " << entry.trigger_mode << ", INT " << entry.source_bus_irq << ", IOAPIC " << entry.destination_ioapic_id << ", IOAPIC INTIN " << entry.destination_ioapic_intin_pin;
overrides.empend(
v_entry_ptr->source_bus_id,
v_entry_ptr->polarity,
v_entry_ptr->trigger_mode,
v_entry_ptr->source_bus_irq,
v_entry_ptr->destination_ioapic_id,
v_entry_ptr->destination_ioapic_intin_pin);
entry.source_bus_id,
entry.polarity,
entry.trigger_mode,
entry.source_bus_irq,
entry.destination_ioapic_id,
entry.destination_ioapic_intin_pin);
}
}
}

23
Kernel/ACPI/MultiProcessorParser.h
View file

@ -27,8 +27,8 @@
#pragma once
#include <AK/Types.h>
#include <Kernel/VM/Region.h>
#include <Kernel/PhysicalAddress.h>
#include <Kernel/VM/Region.h>
#include <Kernel/VirtualAddress.h>
namespace Kernel {
@ -201,22 +201,17 @@ protected:
MultiProcessorParser();
void parse_configuration_table();
size_t get_configuration_table_length();
void parse_floating_pointer_data();
Vector<unsigned> get_pci_bus_ids();
Vector<u8> get_pci_bus_ids() const;
FlatPtr search_floating_pointer();
FlatPtr search_floating_pointer_in_ebda(u16 ebda_segment);
FlatPtr search_floating_pointer_in_bios_area();
PhysicalAddress search_floating_pointer();
PhysicalAddress search_floating_pointer_in_ebda(u16 ebda_segment);
PhysicalAddress search_floating_pointer_in_bios_area();
FlatPtr m_floating_pointer;
FlatPtr m_configuration_table;
Vector<FlatPtr> m_io_interrupt_redirection_entries;
Vector<FlatPtr> m_bus_entries;
bool m_operable;
size_t m_configuration_table_length;
u8 m_specification_revision;
PhysicalAddress m_floating_pointer;
PhysicalAddress m_configuration_table;
Vector<MultiProcessor::IOInterruptAssignmentEntry> m_io_interrupt_assignment_entries;
Vector<MultiProcessor::BusEntry> m_bus_entries;
};
}