feat: Local/IO APIC, PS/2 keyboard & mouse

2026-02-17 12:44:31 +01:00
parent e2f059bf90
commit 641ec4681b
26 changed files with 1730 additions and 3 deletions
@@ -0,0 +1,44 @@
+/*
+    * IoApic.hpp
+    * I/O APIC (I/O Advanced Programmable Interrupt Controller)
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+#include <ACPI/MADT.hpp>
+
+namespace Hal {
+    namespace IoApic {
+        // IOAPIC register indices (written to IOREGSEL)
+        constexpr uint32_t IOAPICID  = 0x00;
+        constexpr uint32_t IOAPICVER = 0x01;
+        constexpr uint32_t IOAPICARB = 0x02;
+        // Redirection table entries start at 0x10, each entry is 2 x 32-bit registers
+        constexpr uint32_t IOREDTBL_BASE = 0x10;
+
+        // Redirection entry flags
+        constexpr uint64_t REDIR_MASKED          = (1ULL << 16);
+        constexpr uint64_t REDIR_LEVEL_TRIGGER   = (1ULL << 15);
+        constexpr uint64_t REDIR_ACTIVE_LOW      = (1ULL << 13);
+        constexpr uint64_t REDIR_LOGICAL_DEST    = (1ULL << 11);
+
+        // IRQ vector base: hardware IRQs start at vector 32
+        constexpr uint8_t IRQ_VECTOR_BASE = 32;
+
+        void Initialize(uint64_t ioApicBasePhys, uint32_t gsiBase,
+                         MADT::InterruptSourceOverride* overrides, int overrideCount);
+
+        void SetRedirectionEntry(uint8_t irq, uint64_t entry);
+        uint64_t GetRedirectionEntry(uint8_t irq);
+
+        void MaskIrq(uint8_t irq);
+        void UnmaskIrq(uint8_t irq);
+
+        // Route an ISA IRQ to a specific vector, applying source overrides
+        void RouteIrq(uint8_t isaIrq, uint8_t vector, uint8_t destinationApicId);
+
+        // Get the GSI for a given ISA IRQ (applies overrides)
+        uint32_t GetGsiForIrq(uint8_t isaIrq);
+    };
+};