diff --git a/libc/kernel/uapi/linux/userio.h b/libc/kernel/uapi/linux/userio.h
new file mode 100644
index 0000000..81bed08
--- /dev/null
+++ b/libc/kernel/uapi/linux/userio.h
@@ -0,0 +1,34 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _USERIO_H
+#define _USERIO_H
+#include <linux/types.h>
+enum userio_cmd_type {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  USERIO_CMD_REGISTER = 0,
+  USERIO_CMD_SET_PORT_TYPE = 1,
+  USERIO_CMD_SEND_INTERRUPT = 2
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct userio_cmd {
+  __u8 type;
+  __u8 data;
+} __attribute__((__packed__));
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif