diff --git a/scripts/cmake/misc.cmake b/scripts/cmake/misc.cmake
index ee794780cd09..36976c119b9d 100644
--- a/scripts/cmake/misc.cmake
+++ b/scripts/cmake/misc.cmake
@@ -49,6 +49,12 @@ macro(is_zephyr ret)
 	endif()
 endmacro()
 
+macro(add_local_sources_ifdef condition target)
+	if(${condition})
+		add_local_sources(${target} ${ARGN})
+	endif()
+endmacro()
+
 # Adds sources to target like target_sources, but assumes that
 # paths are relative to subdirectory.
 # Works like:
diff --git a/zephyr/CMakeLists.txt b/zephyr/CMakeLists.txt
index 621d9782f9cb..008d01650da9 100644
--- a/zephyr/CMakeLists.txt
+++ b/zephyr/CMakeLists.txt
@@ -128,6 +128,20 @@ macro(is_zephyr ret)
 	endif()
 endmacro()
 
+# Wrappers for re-using existing, XTOS CMake files. Do NOT use in Zephyr-specific code.
+macro(add_local_sources target)
+	if (NOT "${target}" STREQUAL "sof")
+		message(FATAL_ERROR "add_local_sources() target is not 'sof'")
+	endif()
+	zephyr_library_sources(${ARGN})
+endmacro()
+macro(add_local_sources_ifdef condition target)
+	if (NOT "${target}" STREQUAL "sof")
+		message(FATAL_ERROR "add_local_sources_ifdef() target is not 'sof'")
+	endif()
+	zephyr_library_sources_ifdef(${condition} ${ARGN})
+endmacro()
+
 add_subdirectory(../src/init/ init_unused_install/)
 add_subdirectory(../src/ipc/  ipc_unused_install/)