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- /*
- * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <Kernel/ACPI/MultiProcessorParser.h>
- #include <Kernel/Arch/i386/CPU.h>
- #include <Kernel/Interrupts/APIC.h>
- #include <Kernel/Interrupts/IOAPIC.h>
- #include <Kernel/Interrupts/InterruptManagement.h>
- #include <Kernel/VM/MemoryManager.h>
- #define IOAPIC_REDIRECTION_ENTRY_OFFSET 0x10
- namespace Kernel {
- enum DeliveryMode {
- Normal = 0,
- LowPriority = 1,
- SMI = 2,
- NMI = 3,
- INIT = 4,
- External = 7
- };
- IOAPIC::IOAPIC(ioapic_mmio_regs& regs, u32 gsi_base, Vector<RefPtr<ISAInterruptOverrideMetadata>>& isa_overrides, Vector<RefPtr<PCIInterruptOverrideMetadata>>& pci_overrides)
- : m_physical_access_registers(regs)
- , m_gsi_base(gsi_base)
- , m_id((read_register(0x0) >> 24) & 0xFF)
- , m_version(read_register(0x1) & 0xFF)
- , m_redirection_entries((read_register(0x1) >> 16) + 1)
- , m_isa_interrupt_overrides(isa_overrides)
- , m_pci_interrupt_overrides(pci_overrides)
- {
- klog() << "IOAPIC ID: 0x" << String::format("%x", m_id);
- klog() << "IOAPIC Version: 0x" << String::format("%x", m_version) << ", Redirection Entries count - " << m_redirection_entries;
- klog() << "IOAPIC Arbitration ID 0x" << String::format("%x", read_register(0x2));
- mask_all_redirection_entries();
- }
- void IOAPIC::initialize()
- {
- }
- void IOAPIC::map_interrupt_redirection(u8 interrupt_vector)
- {
- if (interrupt_vector == 11) {
- configure_redirection_entry(11, 11 + IRQ_VECTOR_BASE, DeliveryMode::LowPriority, false, true, true, true, 0);
- return;
- }
- for (auto redirection_override : m_isa_interrupt_overrides) {
- ASSERT(!redirection_override.is_null());
- if (redirection_override->source() != interrupt_vector)
- continue;
- bool active_low;
- // See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
- switch ((redirection_override->flags() & 0b11)) {
- case 0:
- active_low = false;
- break;
- case 1:
- active_low = false;
- break;
- case 2:
- ASSERT_NOT_REACHED(); // Reserved value
- case 3:
- active_low = true;
- break;
- }
- bool trigger_level_mode;
- // See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
- switch (((redirection_override->flags() >> 2) & 0b11)) {
- case 0:
- trigger_level_mode = false;
- break;
- case 1:
- trigger_level_mode = false;
- break;
- case 2:
- ASSERT_NOT_REACHED(); // Reserved value
- case 3:
- trigger_level_mode = true;
- break;
- }
- configure_redirection_entry(redirection_override->gsi(), redirection_override->source() + IRQ_VECTOR_BASE, DeliveryMode::LowPriority, false, active_low, trigger_level_mode, true, 0);
- return;
- }
- isa_identity_map(interrupt_vector);
- }
- void IOAPIC::isa_identity_map(int index)
- {
- configure_redirection_entry(index, index + IRQ_VECTOR_BASE, DeliveryMode::Normal, true, false, false, true, 1);
- }
- void IOAPIC::map_pci_interrupts()
- {
- configure_redirection_entry(11, 11 + IRQ_VECTOR_BASE, DeliveryMode::Normal, false, false, true, true, 0);
- }
- void IOAPIC::map_isa_interrupts()
- {
- InterruptDisabler disabler;
- for (auto redirection_override : m_isa_interrupt_overrides) {
- ASSERT(!redirection_override.is_null());
- bool active_low;
- // See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
- switch ((redirection_override->flags() & 0b11)) {
- case 0:
- active_low = false;
- break;
- case 1:
- active_low = false;
- break;
- case 2:
- ASSERT_NOT_REACHED();
- case 3:
- active_low = true;
- break;
- }
- bool trigger_level_mode;
- // See ACPI spec Version 6.2, page 205 to learn more about Interrupt Overriding Flags.
- switch (((redirection_override->flags() >> 2) & 0b11)) {
- case 0:
- trigger_level_mode = false;
- break;
- case 1:
- trigger_level_mode = false;
- break;
- case 2:
- ASSERT_NOT_REACHED();
- case 3:
- trigger_level_mode = true;
- break;
- }
- configure_redirection_entry(redirection_override->gsi(), redirection_override->source() + IRQ_VECTOR_BASE, 0, false, active_low, trigger_level_mode, true, 0);
- }
- }
- void IOAPIC::reset_all_redirection_entries() const
- {
- InterruptDisabler disabler;
- for (size_t index = 0; index < m_redirection_entries; index++)
- reset_redirection_entry(index);
- }
- void IOAPIC::hard_disable()
- {
- InterruptDisabler disabler;
- reset_all_redirection_entries();
- IRQController::hard_disable();
- }
- void IOAPIC::reset_redirection_entry(int index) const
- {
- InterruptDisabler disabler;
- configure_redirection_entry(index, 0, 0, false, false, false, true, 0);
- }
- 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
- {
- ASSERT((u32)index < m_redirection_entries);
- u32 redirection_entry1 = interrupt_vector | (delivery_mode & 0b111) << 8 | logical_destination << 11 | active_low << 13 | trigger_level_mode << 15 | masked << 16;
- u32 redirection_entry2 = destination << 24;
- write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry1);
- #ifdef IOAPIC_DEBUG
- dbg() << "IOAPIC Value: 0x" << String::format("%x", read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET));
- #endif
- write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET + 1, redirection_entry2);
- #ifdef IOAPIC_DEBUG
- dbg() << "IOAPIC Value: 0x" << String::format("%x", read_register((index << 1) + 0x11));
- #endif
- }
- void IOAPIC::mask_all_redirection_entries() const
- {
- InterruptDisabler disabler;
- for (size_t index = 0; index < m_redirection_entries; index++)
- mask_redirection_entry(index);
- }
- void IOAPIC::mask_redirection_entry(u8 index) const
- {
- ASSERT((u32)index < m_redirection_entries);
- u32 redirection_entry = read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET) | (1 << 16);
- write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry);
- }
- bool IOAPIC::is_redirection_entry_masked(u8 index) const
- {
- ASSERT((u32)index < m_redirection_entries);
- return (read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET) & (1 << 16)) != 0;
- }
- void IOAPIC::unmask_redirection_entry(u8 index) const
- {
- ASSERT((u32)index < m_redirection_entries);
- u32 redirection_entry = read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET);
- write_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET, redirection_entry & ~(1 << 16));
- }
- bool IOAPIC::is_vector_enabled(u8 interrupt_vector) const
- {
- InterruptDisabler disabler;
- return is_redirection_entry_masked(interrupt_vector);
- }
- u8 IOAPIC::read_redirection_entry_vector(u8 index) const
- {
- ASSERT((u32)index < m_redirection_entries);
- return (read_register((index << 1) + IOAPIC_REDIRECTION_ENTRY_OFFSET) & 0xFF);
- }
- int IOAPIC::find_redirection_entry_by_vector(u8 vector) const
- {
- InterruptDisabler disabler;
- for (size_t index = 0; index < m_redirection_entries; index++) {
- if (read_redirection_entry_vector(index) == (vector + IRQ_VECTOR_BASE))
- return index;
- }
- return -1;
- }
- void IOAPIC::disable(u8 interrupt_vector)
- {
- InterruptDisabler disabler;
- int index = find_redirection_entry_by_vector(interrupt_vector);
- if (index == (-1)) {
- map_interrupt_redirection(interrupt_vector);
- index = find_redirection_entry_by_vector(interrupt_vector);
- }
- ASSERT(index != (-1));
- mask_redirection_entry(index);
- }
- void IOAPIC::enable(u8 interrupt_vector)
- {
- InterruptDisabler disabler;
- int index = find_redirection_entry_by_vector(interrupt_vector);
- if (index == (-1)) {
- map_interrupt_redirection(interrupt_vector);
- index = find_redirection_entry_by_vector(interrupt_vector);
- }
- ASSERT(index != (-1));
- unmask_redirection_entry(index);
- }
- void IOAPIC::eoi(u8) const
- {
- InterruptDisabler disabler;
- APIC::eoi();
- }
- u16 IOAPIC::get_isr() const
- {
- InterruptDisabler disabler;
- ASSERT_NOT_REACHED();
- }
- u16 IOAPIC::get_irr() const
- {
- InterruptDisabler disabler;
- ASSERT_NOT_REACHED();
- }
- void IOAPIC::write_register(u32 index, u32 value) const
- {
- InterruptDisabler disabler;
- auto region = MM.allocate_kernel_region(PhysicalAddress(page_base_of(&m_physical_access_registers)), (PAGE_SIZE * 2), "IOAPIC Write", Region::Access::Read | Region::Access::Write);
- auto& regs = *(volatile ioapic_mmio_regs*)region->vaddr().offset(offset_in_page(&m_physical_access_registers)).as_ptr();
- regs.select = index;
- regs.window = value;
- #ifdef IOAPIC_DEBUG
- dbg() << "IOAPIC Writing, Value 0x" << String::format("%x", regs.window) << " @ offset 0x" << String::format("%x", regs.select);
- #endif
- }
- u32 IOAPIC::read_register(u32 index) const
- {
- InterruptDisabler disabler;
- auto region = MM.allocate_kernel_region(PhysicalAddress(page_base_of(&m_physical_access_registers)), (PAGE_SIZE * 2), "IOAPIC Read", Region::Access::Read | Region::Access::Write);
- auto& regs = *(volatile ioapic_mmio_regs*)region->vaddr().offset(offset_in_page(&m_physical_access_registers)).as_ptr();
- regs.select = index;
- #ifdef IOAPIC_DEBUG
- dbg() << "IOAPIC Reading, Value 0x" << String::format("%x", regs.window) << " @ offset 0x" << String::format("%x", regs.select);
- #endif
- return regs.window;
- }
- }
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