diff --git a/projects/rocr-runtime/libhsakmt/include/hsakmt/freebsd/udmabuf.h b/projects/rocr-runtime/libhsakmt/include/hsakmt/freebsd/udmabuf.h
new file mode 100644
index 0000000000..fb62e52891
--- /dev/null
+++ b/projects/rocr-runtime/libhsakmt/include/hsakmt/freebsd/udmabuf.h
@@ -0,0 +1,37 @@
+// Not sure what liscense yet
+// Sourojeet Adhikari
+// FreeBSD Foundation
+
+
+#ifndef _THUNK_UDMABUF_H
+#define _THUNK_UDMABUF_H
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#define UDMABUF_FLAGS_CLOEXEC 0x01
+
+struct udmabuf_create {
+        __uint32_t memfd;
+        __uint32_t flags;
+        __uint64_t offset;
+        __uint64_t size;
+};
+
+struct udmabuf_create_item {
+        __uint32_t memfd;
+        __uint32_t __pad;
+        __uint64_t offset;
+        __uint64_t size;
+};
+
+struct udmabuf_create_list {
+        __uint32_t flags;
+        __uint32_t count;
+        struct udmabuf_create_item list[];
+};
+
+#define UDMABUF_CREATE       _IOW('u', 0x42, struct udmabuf_create)
+#define UDMABUF_CREATE_LIST  _IOW('u', 0x43, struct udmabuf_create_list)
+
+#endif // _THUNK_UDMABUF_H