diff --git a/libc/kernel/arch-arm/asm/mc146818rtc.h b/libc/kernel/arch-arm/asm/mc146818rtc.h
new file mode 100644
index 0000000..5a86724
--- /dev/null
+++ b/libc/kernel/arch-arm/asm/mc146818rtc.h
@@ -0,0 +1,26 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _ASM_MC146818RTC_H
+#define _ASM_MC146818RTC_H
+
+#include <asm/arch/irqs.h>
+#include <asm/io.h>
+
+#ifndef RTC_PORT
+#define RTC_PORT(x) (0x70 + (x))
+#define RTC_ALWAYS_BCD 1  
+#endif
+
+#define CMOS_READ(addr) ({  outb_p((addr),RTC_PORT(0));  inb_p(RTC_PORT(1));  })
+#define CMOS_WRITE(val, addr) ({  outb_p((addr),RTC_PORT(0));  outb_p((val),RTC_PORT(1));  })
+
+#endif