#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> /* for HZ */
-#include <asm/div64.h>
-
-#ifndef div_long_long_rem
-#define div_long_long_rem(dividend,divisor,remainder) \
-({ \
- u64 result = dividend; \
- *remainder = do_div(result,divisor); \
- result; \
-})
-#endif
/*
* The following defines establish the engineering parameters of the PLL
/* LATCH is used in the interval timer and ftape setup. */
#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */
+#define LATCH_HPET ((HPET_TICK_RATE + HZ/2) / HZ)
+
/* Suppose we want to devide two numbers NOM and DEN: NOM/DEN, the we can
* improve accuracy by shifting LSH bits, hence calculating:
* (NOM << LSH) / DEN
* - (NOM / DEN) fits in (32 - LSH) bits.
* - (NOM % DEN) fits in (32 - LSH) bits.
*/
-#define SH_DIV(NOM,DEN,LSH) ( ((NOM / DEN) << LSH) \
- + (((NOM % DEN) << LSH) + DEN / 2) / DEN)
+#define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH)) \
+ + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))
/* HZ is the requested value. ACTHZ is actual HZ ("<< 8" is for accuracy) */
#define ACTHZ (SH_DIV (CLOCK_TICK_RATE, LATCH, 8))
+#define ACTHZ_HPET (SH_DIV (HPET_TICK_RATE, LATCH_HPET, 8))
+
/* TICK_NSEC is the time between ticks in nsec assuming real ACTHZ */
#define TICK_NSEC (SH_DIV (1000000UL * 1000, ACTHZ, 8))
+#define TICK_NSEC_HPET (SH_DIV(1000000UL * 1000, ACTHZ_HPET, 8))
+
/* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
#define __jiffy_data __attribute__((section(".data")))
/*
- * The 64-bit value is not volatile - you MUST NOT read it
+ * The 64-bit value is not atomic - you MUST NOT read it
* without sampling the sequence number in xtime_lock.
* get_jiffies_64() will do this for you as appropriate.
*/
((long)(a) - (long)(b) >= 0))
#define time_before_eq(a,b) time_after_eq(b,a)
+/* Same as above, but does so with platform independent 64bit types.
+ * These must be used when utilizing jiffies_64 (i.e. return value of
+ * get_jiffies_64() */
+#define time_after64(a,b) \
+ (typecheck(__u64, a) && \
+ typecheck(__u64, b) && \
+ ((__s64)(b) - (__s64)(a) < 0))
+#define time_before64(a,b) time_after64(b,a)
+
+#define time_after_eq64(a,b) \
+ (typecheck(__u64, a) && \
+ typecheck(__u64, b) && \
+ ((__s64)(a) - (__s64)(b) >= 0))
+#define time_before_eq64(a,b) time_after_eq64(b,a)
+
/*
* Have the 32 bit jiffies value wrap 5 minutes after boot
* so jiffies wrap bugs show up earlier.
*/
static inline unsigned int jiffies_to_msecs(const unsigned long j)
{
-#if HZ <= 1000 && !(1000 % HZ)
- return (1000 / HZ) * j;
-#elif HZ > 1000 && !(HZ % 1000)
- return (j + (HZ / 1000) - 1)/(HZ / 1000);
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+ return (MSEC_PER_SEC / HZ) * j;
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+ return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
#else
- return (j * 1000) / HZ;
+ return (j * MSEC_PER_SEC) / HZ;
#endif
}
static inline unsigned int jiffies_to_usecs(const unsigned long j)
{
-#if HZ <= 1000000 && !(1000000 % HZ)
- return (1000000 / HZ) * j;
-#elif HZ > 1000000 && !(HZ % 1000000)
- return (j + (HZ / 1000000) - 1)/(HZ / 1000000);
+#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
+ return (USEC_PER_SEC / HZ) * j;
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+ return (j + (HZ / USEC_PER_SEC) - 1)/(HZ / USEC_PER_SEC);
#else
- return (j * 1000000) / HZ;
+ return (j * USEC_PER_SEC) / HZ;
#endif
}
{
if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
return MAX_JIFFY_OFFSET;
-#if HZ <= 1000 && !(1000 % HZ)
- return (m + (1000 / HZ) - 1) / (1000 / HZ);
-#elif HZ > 1000 && !(HZ % 1000)
- return m * (HZ / 1000);
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+ return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+ return m * (HZ / MSEC_PER_SEC);
#else
- return (m * HZ + 999) / 1000;
+ return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
#endif
}
{
if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
return MAX_JIFFY_OFFSET;
-#if HZ <= 1000000 && !(1000000 % HZ)
- return (u + (1000000 / HZ) - 1) / (1000000 / HZ);
-#elif HZ > 1000000 && !(HZ % 1000000)
- return u * (HZ / 1000000);
+#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
+ return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ);
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+ return u * (HZ / USEC_PER_SEC);
#else
- return (u * HZ + 999999) / 1000000;
+ return (u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
#endif
}
* one divide.
*/
u64 nsec = (u64)jiffies * TICK_NSEC;
- value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_usec);
- value->tv_usec /= NSEC_PER_USEC;
+ long tv_usec;
+
+ value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tv_usec);
+ tv_usec /= NSEC_PER_USEC;
+ value->tv_usec = tv_usec;
}
/*
git://git.onelab.eu / linux-2.6.git / blobdiff