From dca8353027526b9e522ad8be169d9763e447b08b Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 27 Jul 2026 16:10:38 +0200
Subject: kapi: fix device resource lookup

---
 kapi/kapi/devices/resource.hpp | 53 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

(limited to 'kapi')

diff --git a/kapi/kapi/devices/resource.hpp b/kapi/kapi/devices/resource.hpp
index 5c01aba5..1b491225 100644
--- a/kapi/kapi/devices/resource.hpp
+++ b/kapi/kapi/devices/resource.hpp
@@ -102,8 +102,54 @@ namespace kapi::devices
         , m_value{.channel = channel}
     {}
 
-    //! The exact type of this resource.
-    resource_type type{resource_type::invalid};
+    constexpr auto friend operator==(resource const & lhs, resource const & rhs) noexcept -> bool
+    {
+      if (lhs.type != rhs.type)
+      {
+        return false;
+      }
+
+      switch (lhs.type)
+      {
+        case resource_type::invalid:
+          return true;
+        case resource_type::mmio:
+          return lhs.m_value.range == rhs.m_value.range;
+        case resource_type::port:
+          return lhs.m_value.port == rhs.m_value.port;
+        case resource_type::irq:
+          return lhs.m_value.irq == rhs.m_value.irq;
+        case resource_type::dma:
+          return lhs.m_value.channel == rhs.m_value.channel;
+      };
+
+      return false;
+    }
+
+    constexpr auto friend operator==(resource const & lhs, invalid_resource const &) noexcept -> bool
+    {
+      return lhs.type == resource_type::invalid;
+    }
+
+    constexpr auto friend operator==(resource const & lhs, mmio_range const & rhs) noexcept -> bool
+    {
+      return lhs.type == resource_type::mmio && lhs.m_value.range == rhs;
+    }
+
+    constexpr auto friend operator==(resource const & lhs, io_port const & rhs) noexcept -> bool
+    {
+      return lhs.type == resource_type::port && lhs.m_value.port == rhs;
+    }
+
+    constexpr auto friend operator==(resource const & lhs, interrupt_line const & rhs) noexcept -> bool
+    {
+      return lhs.type == resource_type::irq && lhs.m_value.irq == rhs;
+    }
+
+    constexpr auto friend operator==(resource const & lhs, dma_channel const & rhs) noexcept -> bool
+    {
+      return lhs.type == resource_type::dma && lhs.m_value.channel == rhs;
+    }
 
     //! Get the resource value.
     template<resource_type Type>
@@ -136,6 +182,9 @@ namespace kapi::devices
       return m_value;
     }
 
+    //! The exact type of this resource.
+    resource_type type{resource_type::invalid};
+
   private:
     union
     {
-- 
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