diff --git a/libc/kernel/common/linux/jiffies.h b/libc/kernel/common/linux/jiffies.h
new file mode 100644
index 0000000..86b705b
--- /dev/null
+++ b/libc/kernel/common/linux/jiffies.h
@@ -0,0 +1,115 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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 _LINUX_JIFFIES_H
+#define _LINUX_JIFFIES_H
+
+#include <linux/calc64.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <asm/param.h>  
+
+#if HZ >= (12 && HZ < 24)
+#define SHIFT_HZ 4
+#elif HZ >= 24 && HZ < 48
+#define SHIFT_HZ 5
+#elif HZ >= 48 && HZ < 96
+#define SHIFT_HZ 6
+#elif HZ >= 96 && HZ < 192
+#define SHIFT_HZ 7
+#elif HZ >= 192 && HZ < 384
+#define SHIFT_HZ 8
+#elif HZ >= 384 && HZ < 768
+#define SHIFT_HZ 9
+#elif HZ >= 768 && HZ < 1536
+#define SHIFT_HZ 10
+#else
+#error You lose.
+#endif
+
+#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ)  
+
+#define LATCH_HPET ((HPET_TICK_RATE + HZ/2) / HZ)
+
+#define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH))   + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))
+
+#define ACTHZ (SH_DIV (CLOCK_TICK_RATE, LATCH, 8))
+
+#define ACTHZ_HPET (SH_DIV (HPET_TICK_RATE, LATCH_HPET, 8))
+
+#define TICK_NSEC (SH_DIV (1000000UL * 1000, ACTHZ, 8))
+
+#define TICK_NSEC_HPET (SH_DIV(1000000UL * 1000, ACTHZ_HPET, 8))
+
+#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
+
+#define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV (TUSEC * USER_HZ * 1000, ACTHZ, 8))
+
+#define __jiffy_data __attribute__((section(".data")))
+
+#if BITS_PER_LONG < 64
+
+#else
+#endif
+#define time_after(a,b)   (typecheck(unsigned long, a) &&   typecheck(unsigned long, b) &&   ((long)(b) - (long)(a) < 0))
+#define time_before(a,b) time_after(b,a)
+#define time_after_eq(a,b)   (typecheck(unsigned long, a) &&   typecheck(unsigned long, b) &&   ((long)(a) - (long)(b) >= 0))
+#define time_before_eq(a,b) time_after_eq(b,a)
+#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
+#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)
+#define SEC_JIFFIE_SC (31 - SHIFT_HZ)
+#if !((NSEC_PER_SEC << 2) / TICK_NSEC << SEC_JIFFIE_SC - 2 & 0x80000000)
+#undef SEC_JIFFIE_SC
+#define SEC_JIFFIE_SC (32 - SHIFT_HZ)
+#endif
+#define NSEC_JIFFIE_SC (SEC_JIFFIE_SC + 29)
+#define USEC_JIFFIE_SC (SEC_JIFFIE_SC + 19)
+#define SEC_CONVERSION ((unsigned long)((((u64)NSEC_PER_SEC << SEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
+#define NSEC_CONVERSION ((unsigned long)((((u64)1 << NSEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
+#define USEC_CONVERSION   ((unsigned long)((((u64)NSEC_PER_USEC << USEC_JIFFIE_SC) +  TICK_NSEC -1) / (u64)TICK_NSEC))
+#define USEC_ROUND (u64)(((u64)1 << USEC_JIFFIE_SC) - 1)
+#if BITS_PER_LONG < 64
+#define MAX_SEC_IN_JIFFIES   (long)((u64)((u64)MAX_JIFFY_OFFSET * TICK_NSEC) / NSEC_PER_SEC)
+#else
+#define MAX_SEC_IN_JIFFIES   (SH_DIV((MAX_JIFFY_OFFSET >> SEC_JIFFIE_SC) * TICK_NSEC, NSEC_PER_SEC, 1) - 1)
+#endif
+#if HZ <= (MSEC_PER_SEC && !(MSEC_PER_SEC % HZ))
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+#else
+#endif
+#if HZ <= (USEC_PER_SEC && !(USEC_PER_SEC % HZ))
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+#else
+#endif
+#if HZ <= (MSEC_PER_SEC && !(MSEC_PER_SEC % HZ))
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+#else
+#endif
+#if HZ <= (USEC_PER_SEC && !(USEC_PER_SEC % HZ))
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+#else
+#endif
+#if TICK_NSEC % NSEC_PER_SEC / USER_HZ == 0
+#else
+#endif
+#if HZ % USER_HZ == 0
+#else
+#endif
+#if TICK_NSEC % NSEC_PER_SEC / USER_HZ == 0
+#else
+#endif
+#if NSEC_PER_SEC % USER_HZ == 0
+#elif (USER_HZ % 512) == 0
+#else
+#endif
+#endif