auto import from //depot/cupcake/@135843
diff --git a/libc/kernel/arch-x86/asm/i8253.h b/libc/kernel/arch-x86/asm/i8253.h
new file mode 100644
index 0000000..93b1d1a
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/i8253.h
@@ -0,0 +1,19 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ *** 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_I8253_H__
+#define __ASM_I8253_H__
+
+#define PIT_MODE 0x43
+#define PIT_CH0 0x40
+#define PIT_CH2 0x42
+
+#endif