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7fb05c5c23
The compiler couldn't convince itself that these are always initialized when compiling with Og. They are always initialized before use, because the only branch where they weren't had VERIFY_NOT_REACHED.
312 lines
10 KiB
C++
312 lines
10 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Optional.h>
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#include <Kernel/ACPI/MultiProcessorParser.h>
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Interrupts/APIC.h>
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#include <Kernel/Interrupts/IOAPIC.h>
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#include <Kernel/Interrupts/InterruptManagement.h>
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#define IOAPIC_REDIRECTION_ENTRY_OFFSET 0x10
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namespace Kernel {
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enum DeliveryMode {
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Normal = 0,
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LowPriority = 1,
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SMI = 2,
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NMI = 3,
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INIT = 4,
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External = 7
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};
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UNMAP_AFTER_INIT IOAPIC::IOAPIC(PhysicalAddress address, u32 gsi_base)
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: m_address(address)
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, m_regs(map_typed_writable<ioapic_mmio_regs>(m_address))
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, m_gsi_base(gsi_base)
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, m_id((read_register(0x0) >> 24) & 0xFF)
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, m_version(read_register(0x1) & 0xFF)
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, m_redirection_entries_count((read_register(0x1) >> 16) + 1)
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{
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InterruptDisabler disabler;
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dmesgln("IOAPIC ID: {:#x}", m_id);
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dmesgln("IOAPIC Version: {:#x}, redirection entries: {}", m_version, m_redirection_entries_count);
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dmesgln("IOAPIC Arbitration ID {:#x}", read_register(0x2));
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mask_all_redirection_entries();
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}
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UNMAP_AFTER_INIT void IOAPIC::initialize()
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{
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}
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void IOAPIC::map_interrupt_redirection(u8 interrupt_vector)
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{
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InterruptDisabler disabler;
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for (auto redirection_override : InterruptManagement::the().isa_overrides()) {
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if (redirection_override.source() != interrupt_vector)
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continue;
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bool active_low = false;
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// See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
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switch ((redirection_override.flags() & 0b11)) {
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case 0:
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active_low = false;
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break;
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case 1:
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active_low = false;
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break;
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case 2:
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VERIFY_NOT_REACHED(); // Reserved value
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case 3:
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active_low = true;
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break;
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}
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bool trigger_level_mode = false;
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// See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
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switch (((redirection_override.flags() >> 2) & 0b11)) {
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case 0:
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trigger_level_mode = false;
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break;
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case 1:
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trigger_level_mode = false;
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break;
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case 2:
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VERIFY_NOT_REACHED(); // Reserved value
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case 3:
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trigger_level_mode = true;
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break;
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}
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configure_redirection_entry(redirection_override.gsi() - gsi_base(), InterruptManagement::acquire_mapped_interrupt_number(redirection_override.source()) + IRQ_VECTOR_BASE, DeliveryMode::Normal, false, active_low, trigger_level_mode, true, 0);
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return;
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}
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isa_identity_map(interrupt_vector);
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}
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void IOAPIC::isa_identity_map(int index)
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{
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InterruptDisabler disabler;
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configure_redirection_entry(index, InterruptManagement::acquire_mapped_interrupt_number(index) + IRQ_VECTOR_BASE, DeliveryMode::Normal, false, false, false, true, 0);
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}
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void IOAPIC::map_pci_interrupts()
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{
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InterruptDisabler disabler;
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configure_redirection_entry(11, 11 + IRQ_VECTOR_BASE, DeliveryMode::Normal, false, false, true, true, 0);
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}
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bool IOAPIC::is_enabled() const
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{
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return !is_hard_disabled();
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}
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void IOAPIC::spurious_eoi(const GenericInterruptHandler& handler) const
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{
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InterruptDisabler disabler;
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VERIFY(handler.type() == HandlerType::SpuriousInterruptHandler);
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VERIFY(handler.interrupt_number() == APIC::spurious_interrupt_vector());
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dbgln("IOAPIC: Spurious interrupt");
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}
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void IOAPIC::map_isa_interrupts()
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{
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InterruptDisabler disabler;
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for (auto redirection_override : InterruptManagement::the().isa_overrides()) {
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if ((redirection_override.gsi() < gsi_base()) || (redirection_override.gsi() >= (gsi_base() + m_redirection_entries_count)))
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continue;
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bool active_low = false;
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// See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
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switch ((redirection_override.flags() & 0b11)) {
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case 0:
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active_low = false;
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break;
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case 1:
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active_low = false;
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break;
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case 2:
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VERIFY_NOT_REACHED();
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case 3:
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active_low = true;
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break;
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}
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bool trigger_level_mode = false;
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// See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
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switch (((redirection_override.flags() >> 2) & 0b11)) {
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case 0:
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trigger_level_mode = false;
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break;
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case 1:
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trigger_level_mode = false;
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break;
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case 2:
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VERIFY_NOT_REACHED();
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case 3:
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trigger_level_mode = true;
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break;
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}
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configure_redirection_entry(redirection_override.gsi() - gsi_base(), InterruptManagement::acquire_mapped_interrupt_number(redirection_override.source()) + IRQ_VECTOR_BASE, 0, false, active_low, trigger_level_mode, true, 0);
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}
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}
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void IOAPIC::reset_all_redirection_entries() const
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{
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InterruptDisabler disabler;
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for (size_t index = 0; index < m_redirection_entries_count; index++)
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reset_redirection_entry(index);
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}
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void IOAPIC::hard_disable()
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{
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InterruptDisabler disabler;
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reset_all_redirection_entries();
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IRQController::hard_disable();
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}
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void IOAPIC::reset_redirection_entry(int index) const
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{
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InterruptDisabler disabler;
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configure_redirection_entry(index, 0, 0, false, false, false, true, 0);
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}
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void IOAPIC::configure_redirection_entry(int index, u8 interrupt_vector, u8 delivery_mode, bool logical_destination, bool active_low, bool trigger_level_mode, bool masked, u8 destination) const
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{
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InterruptDisabler disabler;
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VERIFY((u32)index < m_redirection_entries_count);
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u32 redirection_entry1 = interrupt_vector | (delivery_mode & 0b111) << 8 | logical_destination << 11 | active_low << 13 | trigger_level_mode << 15 | masked << 16;
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u32 redirection_entry2 = destination << 24;
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write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry1);
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if constexpr (IOAPIC_DEBUG)
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dbgln("IOAPIC Value: {:#x}", read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET));
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write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET + 1, redirection_entry2);
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if constexpr (IOAPIC_DEBUG)
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dbgln("IOAPIC Value: {:#x}", read_register((index << 1) + 0x11));
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}
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void IOAPIC::mask_all_redirection_entries() const
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{
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InterruptDisabler disabler;
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for (size_t index = 0; index < m_redirection_entries_count; index++)
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mask_redirection_entry(index);
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}
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void IOAPIC::mask_redirection_entry(u8 index) const
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{
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VERIFY((u32)index < m_redirection_entries_count);
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u32 redirection_entry = read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET);
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if (redirection_entry & (1 << 16))
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return;
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write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry | (1 << 16));
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}
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bool IOAPIC::is_redirection_entry_masked(u8 index) const
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{
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VERIFY((u32)index < m_redirection_entries_count);
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return (read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET) & (1 << 16)) != 0;
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}
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void IOAPIC::unmask_redirection_entry(u8 index) const
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{
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VERIFY((u32)index < m_redirection_entries_count);
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u32 redirection_entry = read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET);
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if (!(redirection_entry & (1 << 16)))
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return;
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write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry & ~(1 << 16));
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}
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bool IOAPIC::is_vector_enabled(u8 interrupt_vector) const
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{
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InterruptDisabler disabler;
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return is_redirection_entry_masked(interrupt_vector);
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}
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u8 IOAPIC::read_redirection_entry_vector(u8 index) const
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{
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VERIFY((u32)index < m_redirection_entries_count);
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return (read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET) & 0xFF);
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}
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Optional<int> IOAPIC::find_redirection_entry_by_vector(u8 vector) const
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{
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InterruptDisabler disabler;
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for (size_t index = 0; index < m_redirection_entries_count; index++) {
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if (read_redirection_entry_vector(index) == (InterruptManagement::acquire_mapped_interrupt_number(vector) + IRQ_VECTOR_BASE))
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return index;
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}
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return {};
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}
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void IOAPIC::disable(const GenericInterruptHandler& handler)
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{
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InterruptDisabler disabler;
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VERIFY(!is_hard_disabled());
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u8 interrupt_vector = handler.interrupt_number();
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VERIFY(interrupt_vector >= gsi_base() && interrupt_vector < interrupt_vectors_count());
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auto found_index = find_redirection_entry_by_vector(interrupt_vector);
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if (!found_index.has_value()) {
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map_interrupt_redirection(interrupt_vector);
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found_index = find_redirection_entry_by_vector(interrupt_vector);
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}
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VERIFY(found_index.has_value());
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mask_redirection_entry(found_index.value());
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}
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void IOAPIC::enable(const GenericInterruptHandler& handler)
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{
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InterruptDisabler disabler;
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VERIFY(!is_hard_disabled());
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u8 interrupt_vector = handler.interrupt_number();
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VERIFY(interrupt_vector >= gsi_base() && interrupt_vector < interrupt_vectors_count());
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auto found_index = find_redirection_entry_by_vector(interrupt_vector);
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if (!found_index.has_value()) {
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map_interrupt_redirection(interrupt_vector);
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found_index = find_redirection_entry_by_vector(interrupt_vector);
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}
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VERIFY(found_index.has_value());
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unmask_redirection_entry(found_index.value());
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}
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void IOAPIC::eoi(const GenericInterruptHandler& handler) const
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{
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InterruptDisabler disabler;
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VERIFY(!is_hard_disabled());
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VERIFY(handler.interrupt_number() >= gsi_base() && handler.interrupt_number() < interrupt_vectors_count());
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VERIFY(handler.type() != HandlerType::SpuriousInterruptHandler);
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APIC::the().eoi();
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}
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u16 IOAPIC::get_isr() const
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{
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InterruptDisabler disabler;
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VERIFY_NOT_REACHED();
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}
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u16 IOAPIC::get_irr() const
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{
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InterruptDisabler disabler;
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VERIFY_NOT_REACHED();
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}
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void IOAPIC::write_register(u32 index, u32 value) const
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{
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InterruptDisabler disabler;
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m_regs->select = index;
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m_regs->window = value;
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dbgln_if(IOAPIC_DEBUG, "IOAPIC Writing, Value {:#x} @ offset {:#x}", (u32)m_regs->window, (u32)m_regs->select);
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}
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u32 IOAPIC::read_register(u32 index) const
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{
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InterruptDisabler disabler;
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m_regs->select = index;
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dbgln_if(IOAPIC_DEBUG, "IOAPIC Reading, Value {:#x} @ offset {:#x}", (u32)m_regs->window, (u32)m_regs->select);
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return m_regs->window;
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}
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}
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