From 3070bb45b9741165d786b2c5a018ee55c1a82db8 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Fri, 27 Mar 2026 07:05:05 +0100
Subject: kernel/interrupts: switch to flat_map for dispatch

---
 kernel/kapi/interrupts.cpp | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

(limited to 'kernel/kapi')

diff --git a/kernel/kapi/interrupts.cpp b/kernel/kapi/interrupts.cpp
index e172e70..0e37bc3 100644
--- a/kernel/kapi/interrupts.cpp
+++ b/kernel/kapi/interrupts.cpp
@@ -1,10 +1,10 @@
 #include "kapi/interrupts.hpp"
 
+#include <kstd/flat_map>
 #include <kstd/print>
 #include <kstd/vector>
 
 #include <algorithm>
-#include <array>
 #include <cstdint>
 
 namespace kapi::interrupts
@@ -12,13 +12,20 @@ namespace kapi::interrupts
 
   namespace
   {
-    auto constinit handlers = std::array<kstd::vector<handler *>, 256>{};
+    auto constinit handlers = kstd::flat_map<std::uint32_t, kstd::vector<handler *>>{};
   }  // namespace
 
   auto register_handler(std::uint32_t irq_number, handler & handler) -> void
   {
-    auto & handler_list = handlers.at(irq_number);
-    handler_list.push_back(&handler);
+    if (handlers.contains(irq_number))
+    {
+      auto & handler_list = handlers.at(irq_number);
+      handler_list.push_back(&handler);
+    }
+    else
+    {
+      handlers.emplace(irq_number, kstd::vector{&handler});
+    }
   }
 
   auto unregister_handler(std::uint32_t irq_number, handler & handler) -> void
@@ -30,6 +37,12 @@ namespace kapi::interrupts
 
   auto dispatch(std::uint32_t irq_number) -> status
   {
+    if (!handlers.contains(irq_number))
+    {
+      kstd::println(kstd::print_sink::stderr, "[OS:interrupts] No handler for IRQ{}", irq_number);
+      return status::unhandled;
+    }
+
     auto & handler_list = handlers.at(irq_number);
 
     if (handler_list.empty())
-- 
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