diff --git a/libc/kernel/arch-x86/asm/i8259.h b/libc/kernel/arch-x86/asm/i8259.h
new file mode 100644
index 0000000..c2366ea
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/i8259.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_I8259_H__
+#define __ASM_I8259_H__
+
+#define __byte(x,y) (((unsigned char *) &(y))[x])
+#define cached_master_mask (__byte(0, cached_irq_mask))
+#define cached_slave_mask (__byte(1, cached_irq_mask))
+
+#endif