From a82416648d148152338dc612c25bf8dff428e773 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 25 Mar 2026 16:39:13 +0100
Subject: kapi: introduce cpu::interrupt_handler

---
 arch/x86_64/kapi/cpu.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

(limited to 'arch/x86_64/kapi/cpu.cpp')

diff --git a/arch/x86_64/kapi/cpu.cpp b/arch/x86_64/kapi/cpu.cpp
index 8ca3847..b19ba21 100644
--- a/arch/x86_64/kapi/cpu.cpp
+++ b/arch/x86_64/kapi/cpu.cpp
@@ -4,11 +4,22 @@
 
 #include "arch/cpu/initialization.hpp"
 
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <array>
 #include <atomic>
+#include <cstdint>
 
 namespace kapi::cpu
 {
 
+  namespace
+  {
+    constexpr auto irq_offset = 32uz;
+    auto constinit interrupt_handlers = std::array<kstd::vector<interrupt_handler *>, 256 - irq_offset>{};
+  }  // namespace
+
   auto init() -> void
   {
     auto static constinit is_initialized = std::atomic_flag{};
@@ -38,4 +49,42 @@ namespace kapi::cpu
     asm volatile("cli");
   }
 
+  auto register_interrupt_handler(std::uint32_t irq_number, interrupt_handler & handler) -> void
+  {
+    if (irq_number < irq_offset)
+    {
+      system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
+    }
+
+    interrupt_handlers[irq_number - irq_offset].push_back(&handler);
+  }
+
+  auto unregister_interrupt_handler(std::uint32_t irq_number, [[maybe_unused]] interrupt_handler & handler) -> void
+  {
+    if (irq_number < irq_offset)
+    {
+      system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
+    }
+
+    kstd::println("[x86_64:CPU] TODO: support erasure from vector.");
+  }
+
+  auto dispatch_interrupt(std::uint32_t irq_number) -> status
+  {
+    if (irq_number < irq_offset)
+    {
+      return status::unhandled;
+    }
+
+    for (auto handler : interrupt_handlers[irq_number - irq_offset])
+    {
+      if (handler && handler->handle_interrupt(irq_number) == status::handled)
+      {
+        return status::handled;
+      }
+    }
+
+    return status::unhandled;
+  }
+
 }  // namespace kapi::cpu
-- 
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