From d5c2e101d62f6b4b69c45c127e7a729d246da566 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 6 Apr 2026 19:04:16 +0200
Subject: kapi/platform: invert discovery dependencies

---
 arch/x86_64/kapi/platform.cpp  | 17 +++++++++--------
 kapi/include/kapi/platform.hpp |  7 ++-----
 kernel/kapi/platform.cpp       | 15 +++++----------
 3 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/arch/x86_64/kapi/platform.cpp b/arch/x86_64/kapi/platform.cpp
index 2e7c7e4..380fc66 100644
--- a/arch/x86_64/kapi/platform.cpp
+++ b/arch/x86_64/kapi/platform.cpp
@@ -10,7 +10,7 @@
 #include <kstd/print>
 
 #include <cstddef>
-#include <cstdint>
+#include <utility>
 
 namespace kapi::platform
 {
@@ -22,6 +22,10 @@ namespace kapi::platform
 
   auto discover_cpu_topology(kapi::devices::bus & bus) -> bool
   {
+    auto static const core_major = kapi::devices::allocate_major_number();
+    auto static const interrupt_controller_major = kapi::devices::allocate_major_number();
+    auto static core_index = 0uz;
+
     auto madt = kapi::acpi::get_table("APIC");
     if (!madt)
     {
@@ -46,7 +50,10 @@ namespace kapi::platform
           auto is_bsp = !bsp_found;
           bsp_found = true;
 
-          if (kapi::platform::cpu_detected(bus, local_apic->processor_id(), is_bsp))
+          auto lapic = kstd::make_unique<arch::devices::local_apic>(interrupt_controller_major, core_index,
+                                                                    local_apic->apic_id(), default_lapic_address);
+          if (kapi::platform::cpu_detected(bus, core_major, core_index, local_apic->processor_id(), is_bsp,
+                                           std::move(lapic)))
           {
             ++core_count;
           }
@@ -61,10 +68,4 @@ namespace kapi::platform
     return core_count > 0;
   }
 
-  auto create_core_interrupt_controller(std::size_t major, std::size_t minor, std::uint64_t hardware_id)
-      -> kstd::unique_ptr<devices::device>
-  {
-    return kstd::make_unique<arch::devices::local_apic>(major, minor, hardware_id, default_lapic_address);
-  }
-
 }  // namespace kapi::platform
\ No newline at end of file
diff --git a/kapi/include/kapi/platform.hpp b/kapi/include/kapi/platform.hpp
index 6aae795..e1e267e 100644
--- a/kapi/include/kapi/platform.hpp
+++ b/kapi/include/kapi/platform.hpp
@@ -14,8 +14,8 @@ namespace kapi::platform
   //! @addtogroup kapi-platform-kernel-defined
   //! @{
 
-  auto cpu_detected(kapi::devices::bus & bus, std::uint64_t hardware_id, bool is_bsp) -> bool;
-
+  auto cpu_detected(kapi::devices::bus & bus, std::size_t major, std::size_t minor, std::uint64_t hardware_id,
+                    bool is_bsp, kstd::unique_ptr<devices::device> core_interrupt_controller) -> bool;
   //! @}
 
   //! @addtogroup kapi-platform-platform-defined
@@ -27,9 +27,6 @@ namespace kapi::platform
   //! @return true iff. the CPU topology was discovered successfully, false otherwise.
   auto discover_cpu_topology(kapi::devices::bus & bus) -> bool;
 
-  auto create_core_interrupt_controller(std::size_t major, std::size_t minor, std::uint64_t hardware_id)
-      -> kstd::unique_ptr<devices::device>;
-
   //! @}
 
 }  // namespace kapi::platform
diff --git a/kernel/kapi/platform.cpp b/kernel/kapi/platform.cpp
index deb72de..7638cf9 100644
--- a/kernel/kapi/platform.cpp
+++ b/kernel/kapi/platform.cpp
@@ -6,26 +6,21 @@
 
 #include <kstd/memory>
 
+#include <cstddef>
 #include <cstdint>
 #include <utility>
 
 namespace kapi::platform
 {
 
-  auto cpu_detected(kapi::devices::bus & bus, std::uint64_t hardware_id, bool is_bsp) -> bool
+  auto cpu_detected(kapi::devices::bus & bus, std::size_t major, std::size_t minor, std::uint64_t hardware_id,
+                    bool is_bsp, kstd::unique_ptr<devices::device> core_interrupt_controller) -> bool
   {
-    auto static const core_major = kapi::devices::allocate_major_number();
-    auto static const interrupt_controller_major = kapi::devices::allocate_major_number();
-    auto static core_index = 0uz;
+    auto core = kstd::make_unique<kernel::devices::cpu::core>(major, minor, hardware_id, is_bsp);
 
-    auto core = kstd::make_unique<kernel::devices::cpu::core>(core_major, core_index, hardware_id, is_bsp);
-    auto lapic = kapi::platform::create_core_interrupt_controller(interrupt_controller_major, core_index, hardware_id);
-
-    core->add_child(std::move(lapic));
+    core->add_child(std::move(core_interrupt_controller));
     bus.add_child(std::move(core));
 
-    ++core_index;
-
     return true;
   }
 
-- 
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