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Kernel: Allow switching to IOAPIC mode even without enabling SMP

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This small change allows to use the IOAPIC by default without to enable
SMP mode, which emulates Uni-Processor setup with IOAPIC instead of
using the PIC.

This opens the opportunity to utilize other types of interrupts like MSI
and MSI-X interrupts.
This commit is contained in:
Liav A 2021-11-28 17:38:10 +02:00 committed by Andreas Kling
parent f57900a41b
commit ac7953f945
Notes: sideshowbarker 2024-07-17 22:47:30 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/ac7953f9457
Pull-request: https://github.com/SerenityOS/serenity/pull/11116
Reviewed-by: https://github.com/dascandy
5 changed files with 41 additions and 29 deletions
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10
Kernel/CommandLine.cpp
View file

@ -111,6 +111,16 @@ UNMAP_AFTER_INIT bool CommandLine::is_smp_enabled() const
return lookup("smp"sv).value_or("off"sv) == "on"sv;
}
UNMAP_AFTER_INIT bool CommandLine::is_ioapic_enabled() const
{
auto value = lookup("enable_ioapic"sv).value_or("on"sv);
if (value == "on"sv)
return true;
if (value == "off"sv)
return false;
PANIC("Unknown enable_ioapic setting: {}", value);
}
UNMAP_AFTER_INIT bool CommandLine::is_vmmouse_enabled() const
{
return lookup("vmmouse"sv).value_or("on"sv) == "on"sv;

1
Kernel/CommandLine.h
View file

@ -59,6 +59,7 @@ public:
[[nodiscard]] bool is_boot_profiling_enabled() const;
[[nodiscard]] bool is_ide_enabled() const;
[[nodiscard]] bool is_ioapic_enabled() const;
[[nodiscard]] bool is_smp_enabled() const;
[[nodiscard]] bool is_physical_networking_disabled() const;
[[nodiscard]] bool is_vmmouse_enabled() const;

49
Kernel/Interrupts/APIC.cpp
View file

@ -270,29 +270,32 @@ UNMAP_AFTER_INIT bool APIC::init_bsp()
return false;
}
auto madt = Memory::map_typed<ACPI::Structures::MADT>(madt_address.value());
size_t entry_index = 0;
size_t entries_length = madt->h.length - sizeof(ACPI::Structures::MADT);
auto* madt_entry = madt->entries;
while (entries_length > 0) {
size_t entry_length = madt_entry->length;
if (madt_entry->type == (u8)ACPI::Structures::MADTEntryType::LocalAPIC) {
auto* plapic_entry = (const ACPI::Structures::MADTEntries::ProcessorLocalAPIC*)madt_entry;
dbgln_if(APIC_DEBUG, "APIC: AP found @ MADT entry {}, processor ID: {}, xAPIC ID: {}, flags: {:#08x}", entry_index, plapic_entry->acpi_processor_id, plapic_entry->apic_id, plapic_entry->flags);
m_processor_cnt++;
if ((plapic_entry->flags & 0x1) != 0)
m_processor_enabled_cnt++;
} else if (madt_entry->type == (u8)ACPI::Structures::MADTEntryType::Local_x2APIC) {
// Only used for APID IDs >= 255
auto* plx2apic_entry = (const ACPI::Structures::MADTEntries::ProcessorLocalX2APIC*)madt_entry;
dbgln_if(APIC_DEBUG, "APIC: AP found @ MADT entry {}, processor ID: {}, x2APIC ID: {}, flags: {:#08x}", entry_index, plx2apic_entry->acpi_processor_id, plx2apic_entry->apic_id, plx2apic_entry->flags);
m_processor_cnt++;
if ((plx2apic_entry->flags & 0x1) != 0)
m_processor_enabled_cnt++;
if (kernel_command_line().is_smp_enabled()) {
auto madt = Memory::map_typed<ACPI::Structures::MADT>(madt_address.value());
size_t entry_index = 0;
size_t entries_length = madt->h.length - sizeof(ACPI::Structures::MADT);
auto* madt_entry = madt->entries;
while (entries_length > 0) {
size_t entry_length = madt_entry->length;
if (madt_entry->type == (u8)ACPI::Structures::MADTEntryType::LocalAPIC) {
auto* plapic_entry = (const ACPI::Structures::MADTEntries::ProcessorLocalAPIC*)madt_entry;
dbgln_if(APIC_DEBUG, "APIC: AP found @ MADT entry {}, processor ID: {}, xAPIC ID: {}, flags: {:#08x}", entry_index, plapic_entry->acpi_processor_id, plapic_entry->apic_id, plapic_entry->flags);
m_processor_cnt++;
if ((plapic_entry->flags & 0x1) != 0)
m_processor_enabled_cnt++;
} else if (madt_entry->type == (u8)ACPI::Structures::MADTEntryType::Local_x2APIC) {
// Only used for APID IDs >= 255
auto* plx2apic_entry = (const ACPI::Structures::MADTEntries::ProcessorLocalX2APIC*)madt_entry;
dbgln_if(APIC_DEBUG, "APIC: AP found @ MADT entry {}, processor ID: {}, x2APIC ID: {}, flags: {:#08x}", entry_index, plx2apic_entry->acpi_processor_id, plx2apic_entry->apic_id, plx2apic_entry->flags);
m_processor_cnt++;
if ((plx2apic_entry->flags & 0x1) != 0)
m_processor_enabled_cnt++;
}
madt_entry = (ACPI::Structures::MADTEntryHeader*)(VirtualAddress(madt_entry).offset(entry_length).get());
entries_length -= entry_length;
entry_index++;
}
madt_entry = (ACPI::Structures::MADTEntryHeader*)(VirtualAddress(madt_entry).offset(entry_length).get());
entries_length -= entry_length;
entry_index++;
dbgln("APIC processors found: {}, enabled: {}", m_processor_cnt, m_processor_enabled_cnt);
}
if (m_processor_enabled_cnt < 1)
@ -300,8 +303,6 @@ UNMAP_AFTER_INIT bool APIC::init_bsp()
if (m_processor_cnt < 1)
m_processor_cnt = 1;
dbgln("APIC processors found: {}, enabled: {}", m_processor_cnt, m_processor_enabled_cnt);
enable(0);
return true;
}

8
Kernel/Interrupts/InterruptManagement.cpp
View file

@ -41,10 +41,10 @@ UNMAP_AFTER_INIT void InterruptManagement::initialize()
VERIFY(!InterruptManagement::initialized());
s_interrupt_management = new InterruptManagement();
if (kernel_command_line().is_smp_enabled())
InterruptManagement::the().switch_to_ioapic_mode();
else
if (!kernel_command_line().is_ioapic_enabled() && !kernel_command_line().is_smp_enabled())
InterruptManagement::the().switch_to_pic_mode();
else
InterruptManagement::the().switch_to_ioapic_mode();
}
void InterruptManagement::enumerate_interrupt_handlers(Function<void(GenericInterruptHandler&)> callback)
@ -220,7 +220,7 @@ UNMAP_AFTER_INIT void InterruptManagement::locate_apic_data()
dbgln("Interrupts: Overriding INT {:#x} with GSI {}, for bus {:#x}",
interrupt_override_entry->source,
global_system_interrupt,
flags);
interrupt_override_entry->bus);
}
madt_entry = (ACPI::Structures::MADTEntryHeader*)(VirtualAddress(madt_entry).offset(entry_length).get());
entries_length -= entry_length;

2
Kernel/init.cpp
View file

@ -271,7 +271,7 @@ void init_stage2(void*)
WorkQueue::initialize();
if (APIC::initialized() && APIC::the().enabled_processor_count() > 1) {
if (kernel_command_line().is_smp_enabled() && APIC::initialized() && APIC::the().enabled_processor_count() > 1) {
// We can't start the APs until we have a scheduler up and running.
// We need to be able to process ICI messages, otherwise another
// core may send too many and end up deadlocking once the pool is