diff --git a/libc/kernel/arch-mips/asm/mach-ip22/ds1286.h b/libc/kernel/arch-mips/asm/mach-ip22/ds1286.h
new file mode 100644
index 0000000..1ea8a7d
--- /dev/null
+++ b/libc/kernel/arch-mips/asm/mach-ip22/ds1286.h
@@ -0,0 +1,25 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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 __ASM_MACH_IP22_DS1286_H
+#define __ASM_MACH_IP22_DS1286_H
+#include <asm/sgi/hpc3.h>
+#define rtc_read(reg) (hpc3c0->rtcregs[(reg)] & 0xff)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define rtc_write(data, reg) do { hpc3c0->rtcregs[(reg)] = (data); } while(0)
+#endif