45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*
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* IoApic.hpp
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* I/O APIC (I/O Advanced Programmable Interrupt Controller)
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* Copyright (c) 2025 Daniel Hammer
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*/
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#pragma once
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#include <cstdint>
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#include <ACPI/MADT.hpp>
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namespace Hal {
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namespace IoApic {
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// IOAPIC register indices (written to IOREGSEL)
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constexpr uint32_t IOAPICID = 0x00;
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constexpr uint32_t IOAPICVER = 0x01;
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constexpr uint32_t IOAPICARB = 0x02;
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// Redirection table entries start at 0x10, each entry is 2 x 32-bit registers
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constexpr uint32_t IOREDTBL_BASE = 0x10;
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// Redirection entry flags
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constexpr uint64_t REDIR_MASKED = (1ULL << 16);
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constexpr uint64_t REDIR_LEVEL_TRIGGER = (1ULL << 15);
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constexpr uint64_t REDIR_ACTIVE_LOW = (1ULL << 13);
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constexpr uint64_t REDIR_LOGICAL_DEST = (1ULL << 11);
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// IRQ vector base: hardware IRQs start at vector 32
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constexpr uint8_t IRQ_VECTOR_BASE = 32;
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void Initialize(uint64_t ioApicBasePhys, uint32_t gsiBase,
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MADT::InterruptSourceOverride* overrides, int overrideCount);
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void SetRedirectionEntry(uint8_t irq, uint64_t entry);
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uint64_t GetRedirectionEntry(uint8_t irq);
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void MaskIrq(uint8_t irq);
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void UnmaskIrq(uint8_t irq);
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// Route an ISA IRQ to a specific vector, applying source overrides
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void RouteIrq(uint8_t isaIrq, uint8_t vector, uint8_t destinationApicId);
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// Get the GSI for a given ISA IRQ (applies overrides)
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uint32_t GetGsiForIrq(uint8_t isaIrq);
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};
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};
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