79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* ApicInit.cpp
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* APIC subsystem initialization
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* Copyright (c) 2025 Daniel Hammer
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*/
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#include "ApicInit.hpp"
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#include "Pic.hpp"
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#include "Apic.hpp"
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#include "IoApic.hpp"
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#include "Interrupts.hpp"
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#include <ACPI/MADT.hpp>
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#include <Arch/x86_64/IDT.hpp>
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#include <Terminal/Terminal.hpp>
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#include <CppLib/Stream.hpp>
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#include <Memory/Paging.hpp>
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#include <Memory/HHDM.hpp>
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using namespace Kt;
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namespace Hal {
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static int g_detectedCpuCount = 0;
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int GetDetectedCpuCount() { return g_detectedCpuCount; }
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void ApicInitialize(ACPI::CommonSDTHeader* xsdt) {
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KernelLogStream(INFO, "APIC") << "Initializing APIC subsystem";
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// Step 1: Parse MADT
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MADT::ParsedMADT madt{};
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if (!MADT::Parse(xsdt, madt)) {
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KernelLogStream(ERROR, "APIC") << "Failed to parse MADT, cannot initialize APIC";
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return;
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}
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g_detectedCpuCount = madt.LocalApicCount;
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if (madt.IoApicAddress == 0) {
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KernelLogStream(ERROR, "APIC") << "No IOAPIC found in MADT";
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return;
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}
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// Step 2: Map APIC MMIO regions into kernel page tables
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// The HHDM only covers physical RAM; MMIO regions need explicit mapping.
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if (Memory::VMM::g_paging) {
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Memory::VMM::g_paging->MapMMIO(madt.LocalApicAddress, Memory::HHDM(madt.LocalApicAddress));
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KernelLogStream(DEBUG, "APIC") << "Mapped Local APIC MMIO at phys " << base::hex << madt.LocalApicAddress;
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Memory::VMM::g_paging->MapMMIO(madt.IoApicAddress, Memory::HHDM(madt.IoApicAddress));
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KernelLogStream(DEBUG, "APIC") << "Mapped IOAPIC MMIO at phys " << base::hex << madt.IoApicAddress;
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}
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// Step 3: Disable legacy 8259 PIC
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DisableLegacyPic();
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// Step 4: Install IRQ stubs into IDT
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InitializeIrqHandlers();
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IDTReload();
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// Step 5: Initialize Local APIC
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LocalApic::Initialize(madt.LocalApicAddress);
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// Step 6: Initialize IOAPIC
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IoApic::Initialize(madt.IoApicAddress, madt.IoApicGsiBase,
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madt.Overrides, madt.OverrideCount);
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// Step 7: Route keyboard (IRQ1) and mouse (IRQ12) to BSP
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uint8_t bspApicId = (uint8_t)LocalApic::GetId();
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IoApic::RouteIrq(Arch::IRQ_KEYBOARD, IRQ_VECTOR_BASE + Arch::IRQ_KEYBOARD, bspApicId);
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IoApic::RouteIrq(Arch::IRQ_MOUSE, IRQ_VECTOR_BASE + Arch::IRQ_MOUSE, bspApicId);
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// Note: sti is NOT called here. The caller (Main.cpp) enables
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// interrupts after setting up per-CPU GS base for SMP/SWAPGS.
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KernelLogStream(OK, "APIC") << "APIC subsystem initialized";
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}
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};
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