diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d909c9..442368d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,7 @@ add_subdirectory(extern)
 include(cmake/aurora_core.cmake)
 include(cmake/aurora_gx.cmake)
 include(cmake/aurora_pad.cmake)
+include(cmake/aurora_si.cmake)
 include(cmake/aurora_main.cmake)
 include(cmake/aurora_mtx.cmake)
 include(cmake/aurora_vi.cmake)
diff --git a/cmake/aurora_pad.cmake b/cmake/aurora_pad.cmake
index 77fc6d2..b3db579 100644
--- a/cmake/aurora_pad.cmake
+++ b/cmake/aurora_pad.cmake
@@ -3,5 +3,5 @@ add_library(aurora_pad STATIC lib/dolphin/pad/pad.cpp)
 add_library(aurora::pad ALIAS aurora_pad)
 
 target_include_directories(aurora_pad PUBLIC include)
-target_link_libraries(aurora_pad PUBLIC aurora::core)
+target_link_libraries(aurora_pad PUBLIC aurora::core aurora::si)
 target_link_libraries(aurora_pad PRIVATE absl::flat_hash_map)
diff --git a/cmake/aurora_si.cmake b/cmake/aurora_si.cmake
new file mode 100644
index 0000000..e44961f
--- /dev/null
+++ b/cmake/aurora_si.cmake
@@ -0,0 +1,6 @@
+add_library(aurora_si STATIC lib/dolphin/si/si.cpp)
+
+add_library(aurora::si ALIAS aurora_si)
+
+target_include_directories(aurora_si PUBLIC include)
+target_link_libraries(aurora_si PUBLIC aurora::core)
diff --git a/lib/dolphin/pad/pad.cpp b/lib/dolphin/pad/pad.cpp
index 12e2f46..b391288 100644
--- a/lib/dolphin/pad/pad.cpp
+++ b/lib/dolphin/pad/pad.cpp
@@ -264,22 +264,6 @@ void PADControlAllMotors(const uint32_t* commands) {
   }
 }
 
-uint32_t SIProbe(int32_t chan) {
-  auto* const controller = aurora::input::get_controller_for_player(chan);
-  if (controller == nullptr) {
-    return SI_ERROR_NO_RESPONSE;
-  }
-
-  if (controller->m_isGameCube) {
-    auto level = SDL_GetJoystickPowerInfo(SDL_GetGamepadJoystick(controller->m_controller), nullptr);
-    if (level == SDL_POWERSTATE_UNKNOWN) {
-      return SI_GC_WAVEBIRD;
-    }
-  }
-
-  return SI_GC_CONTROLLER;
-}
-
 struct PADCLampRegion {
   uint8_t minTrigger;
   uint8_t maxTrigger;
diff --git a/lib/dolphin/si/si.cpp b/lib/dolphin/si/si.cpp
new file mode 100644
index 0000000..6164105
--- /dev/null
+++ b/lib/dolphin/si/si.cpp
@@ -0,0 +1,20 @@
+#include <dolphin/si.h>
+#include "../../input.hpp"
+
+#include <SDL3/SDL_power.h>
+
+uint32_t SIProbe(int32_t chan) {
+  auto* const controller = aurora::input::get_controller_for_player(chan);
+  if (controller == nullptr) {
+    return SI_ERROR_NO_RESPONSE;
+  }
+
+  if (controller->m_isGameCube) {
+    auto level = SDL_GetJoystickPowerInfo(SDL_GetGamepadJoystick(controller->m_controller), nullptr);
+    if (level == SDL_POWERSTATE_UNKNOWN) {
+      return SI_GC_WAVEBIRD;
+    }
+  }
+
+  return SI_GC_CONTROLLER;
+}