auto import from //depot/cupcake/@135843
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