333 lines
7.6 KiB
C++
333 lines
7.6 KiB
C++
#include <BAN/ScopeGuard.h>
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#include <kernel/Debug.h>
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#include <kernel/ACPI.h>
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#include <kernel/APIC.h>
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#include <kernel/CPUID.h>
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#include <kernel/IDT.h>
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#include <kernel/Memory/PageTable.h>
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#include <kernel/MMIO.h>
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#include <string.h>
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#define LAPIC_EIO_REG 0xB0
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#define LAPIC_SIV_REG 0xF0
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#define LAPIC_IS_REG 0x100
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#define IOAPIC_MAX_REDIRS 0x01
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#define IOAPIC_REDIRS 0x10
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#define DEBUG_PRINT_PROCESSORS 0
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// https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#multiple-apic-description-table-madt-format
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namespace Kernel
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{
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struct MADT : public Kernel::ACPI::SDTHeader
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{
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uint32_t local_apic;
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uint32_t flags;
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} __attribute__((packed));
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struct MADTEntry
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{
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uint8_t type;
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uint8_t length;
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union
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{
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struct
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{
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uint8_t acpi_processor_id;
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uint8_t apic_id;
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uint32_t flags;
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} __attribute__((packed)) entry0;
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struct
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{
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uint8_t ioapic_id;
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uint8_t reserved;
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uint32_t ioapic_address;
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uint32_t gsi_base;
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} __attribute__((packed)) entry1;
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struct
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{
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uint8_t bus_source;
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uint8_t irq_source;
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uint32_t gsi;
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uint16_t flags;
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} __attribute__((packed)) entry2;
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struct
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{
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uint16_t reserved;
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uint64_t address;
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} __attribute__((packed)) entry5;
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};
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} __attribute__((packed));
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union RedirectionEntry
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{
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struct
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{
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uint64_t vector : 8;
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uint64_t delivery_mode : 3;
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uint64_t destination_mode : 1;
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uint64_t delivery_status : 1;
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uint64_t pin_polarity : 1;
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uint64_t remote_irr : 1;
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uint64_t trigger_mode : 1;
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uint64_t mask : 1;
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uint64_t reserved : 39;
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uint64_t destination : 8;
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};
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struct
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{
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uint32_t lo_dword;
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uint32_t hi_dword;
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};
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};
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APIC* APIC::create()
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{
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uint32_t ecx, edx;
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CPUID::get_features(ecx, edx);
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if (!(edx & CPUID::Features::EDX_APIC))
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{
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dprintln("Local APIC is not available");
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return nullptr;
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}
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const MADT* madt = (const MADT*)Kernel::ACPI::get().get_header("APIC"sv, 0);
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if (madt == nullptr)
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{
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dprintln("Could not find MADT header");
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return nullptr;
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}
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APIC* apic = new APIC;
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apic->m_local_apic_paddr = madt->local_apic;
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for (uint32_t i = 0x00; i <= 0xFF; i++)
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apic->m_irq_overrides[i] = i;
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uintptr_t madt_entry_addr = (uintptr_t)madt + sizeof(MADT);
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while (madt_entry_addr < (uintptr_t)madt + madt->length)
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{
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const MADTEntry* entry = (const MADTEntry*)madt_entry_addr;
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switch (entry->type)
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{
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case 0:
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Processor processor;
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processor.processor_id = entry->entry0.acpi_processor_id;
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processor.apic_id = entry->entry0.apic_id;
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processor.flags = entry->entry0.flags & 0x03;
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MUST(apic->m_processors.push_back(processor));
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break;
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case 1:
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IOAPIC ioapic;
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ioapic.id = entry->entry1.ioapic_id;
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ioapic.paddr = entry->entry1.ioapic_address;
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ioapic.gsi_base = entry->entry1.gsi_base;
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ioapic.max_redirs = 0;
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MUST(apic->m_io_apics.push_back(ioapic));
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break;
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case 2:
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apic->m_irq_overrides[entry->entry2.irq_source] = entry->entry2.gsi;
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break;
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case 5:
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apic->m_local_apic_paddr = entry->entry5.address;
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break;
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default:
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dprintln("Unhandled madt entry, type {}", entry->type);
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break;
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}
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madt_entry_addr += entry->length;
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}
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if (apic->m_local_apic_paddr == 0 || apic->m_io_apics.empty())
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{
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dprintln("MADT did not provide necessary information");
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delete apic;
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return nullptr;
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}
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// Map the local apic to kernel memory
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{
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vaddr_t vaddr = PageTable::kernel().reserve_free_page(KERNEL_OFFSET);
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ASSERT(vaddr);
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dprintln("lapic paddr {8H}", apic->m_local_apic_paddr);
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apic->m_local_apic_vaddr = vaddr + (apic->m_local_apic_paddr % PAGE_SIZE);
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dprintln("lapic vaddr {8H}", apic->m_local_apic_vaddr);
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PageTable::kernel().map_page_at(
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apic->m_local_apic_paddr & PAGE_ADDR_MASK,
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apic->m_local_apic_vaddr & PAGE_ADDR_MASK,
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PageTable::Flags::ReadWrite | PageTable::Flags::Present
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);
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}
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// Map io apics to kernel memory
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for (auto& io_apic : apic->m_io_apics)
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{
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vaddr_t vaddr = PageTable::kernel().reserve_free_page(KERNEL_OFFSET);
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ASSERT(vaddr);
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io_apic.vaddr = vaddr + (io_apic.paddr % PAGE_SIZE);
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PageTable::kernel().map_page_at(
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io_apic.paddr & PAGE_ADDR_MASK,
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io_apic.vaddr & PAGE_ADDR_MASK,
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PageTable::Flags::ReadWrite | PageTable::Flags::Present
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);
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io_apic.max_redirs = io_apic.read(IOAPIC_MAX_REDIRS);
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}
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// Mask all interrupts
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uint32_t sivr = apic->read_from_local_apic(LAPIC_SIV_REG);
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apic->write_to_local_apic(LAPIC_SIV_REG, sivr | 0x1FF);
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#if DEBUG_PRINT_PROCESSORS
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for (auto& processor : apic->m_processors)
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{
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dprintln("Processor{}", processor.processor_id);
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dprintln(" lapic id: {}", processor.apic_id);
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dprintln(" status: {}", (processor.flags & Processor::Flags::Enabled) ? "enabled" : (processor.flags & Processor::Flags::OnlineCapable) ? "can be enabled" : "disabled");
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}
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#endif
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return apic;
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}
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uint32_t APIC::read_from_local_apic(ptrdiff_t offset)
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{
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return MMIO::read32(m_local_apic_vaddr + offset);
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}
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void APIC::write_to_local_apic(ptrdiff_t offset, uint32_t data)
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{
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MMIO::write32(m_local_apic_vaddr + offset, data);
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}
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uint32_t APIC::IOAPIC::read(uint8_t offset)
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{
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MMIO::write32(vaddr, offset);
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return MMIO::read32(vaddr + 16);
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}
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void APIC::IOAPIC::write(uint8_t offset, uint32_t data)
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{
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MMIO::write32(vaddr, offset);
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MMIO::write32(vaddr + 16, data);
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}
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void APIC::eoi(uint8_t)
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{
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write_to_local_apic(LAPIC_EIO_REG, 0);
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}
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void APIC::enable_irq(uint8_t irq)
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{
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CriticalScope _;
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uint32_t gsi = m_irq_overrides[irq];
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{
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int byte = gsi / 8;
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int bit = gsi % 8;
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ASSERT(m_reserved_gsis[byte] & (1 << bit));
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}
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IOAPIC* ioapic = nullptr;
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for (IOAPIC& io : m_io_apics)
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{
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if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
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{
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ioapic = &io;
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break;
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}
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}
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ASSERT(ioapic);
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RedirectionEntry redir;
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redir.lo_dword = ioapic->read(IOAPIC_REDIRS + gsi * 2);
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redir.hi_dword = ioapic->read(IOAPIC_REDIRS + gsi * 2 + 1);
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ASSERT(redir.mask); // TODO: handle overlapping interrupts
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redir.vector = IRQ_VECTOR_BASE + irq;
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redir.mask = 0;
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redir.destination = m_processors.front().apic_id;
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ioapic->write(IOAPIC_REDIRS + gsi * 2, redir.lo_dword);
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ioapic->write(IOAPIC_REDIRS + gsi * 2 + 1, redir.hi_dword);
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}
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bool APIC::is_in_service(uint8_t irq)
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{
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uint32_t dword = (irq + IRQ_VECTOR_BASE) / 32;
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uint32_t bit = (irq + IRQ_VECTOR_BASE) % 32;
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uint32_t isr = read_from_local_apic(LAPIC_IS_REG + dword * 0x10);
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return isr & (1 << bit);
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}
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BAN::ErrorOr<void> APIC::reserve_irq(uint8_t irq)
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{
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CriticalScope _;
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uint32_t gsi = m_irq_overrides[irq];
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IOAPIC* ioapic = nullptr;
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for (IOAPIC& io : m_io_apics)
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{
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if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
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{
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ioapic = &io;
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break;
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}
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}
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if (!ioapic)
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{
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dwarnln("Cannot enable irq {} for APIC", irq);
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return BAN::Error::from_errno(EFAULT);
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}
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int byte = gsi / 8;
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int bit = gsi % 8;
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if (m_reserved_gsis[byte] & (1 << bit))
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{
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dwarnln("irq {} is already reserved", irq);
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return BAN::Error::from_errno(EFAULT);
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}
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m_reserved_gsis[byte] |= 1 << bit;
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return {};
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}
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BAN::Optional<uint8_t> APIC::get_free_irq()
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{
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CriticalScope _;
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for (int irq = 0; irq <= 0xFF; irq++)
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{
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uint32_t gsi = m_irq_overrides[irq];
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IOAPIC* ioapic = nullptr;
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for (IOAPIC& io : m_io_apics)
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{
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if (io.gsi_base <= gsi && gsi <= io.gsi_base + io.max_redirs)
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{
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ioapic = &io;
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break;
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}
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}
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if (!ioapic)
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continue;
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int byte = gsi / 8;
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int bit = gsi % 8;
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if (m_reserved_gsis[byte] & (1 << bit))
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continue;
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m_reserved_gsis[byte] |= 1 << bit;
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return irq;
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}
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return {};
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}
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}
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