FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/jiffies.h

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _LINUXKPI_LINUX_JIFFIES_H_
    #define _LINUXKPI_LINUX_JIFFIES_H_
    
    #include <linux/types.h>
    #include <linux/time.h>
    
    #include <sys/time.h>
    #include <sys/kernel.h>
    #include <sys/limits.h>
    
    #define jiffies                 ticks
    #define jiffies_64              ticks
    #define jiffies_to_msecs(x)     (((int64_t)(int)(x)) * 1000 / hz)
    
    #define MAX_JIFFY_OFFSET        ((INT_MAX >> 1) - 1)
    
    #define time_after(a, b)        ((int)((b) - (a)) < 0)
    #define time_after32(a, b)      ((int32_t)((uint32_t)(b) - (uint32_t)(a)) < 0)
    #define time_before(a, b)       time_after(b,a)
    #define time_before32(a, b)     time_after32(b, a)
    #define time_after_eq(a, b)     ((int)((a) - (b)) >= 0)
    #define time_before_eq(a, b)    time_after_eq(b, a)
    #define time_in_range(a,b,c)    \
            (time_after_eq(a,b) && time_before_eq(a,c))
    #define time_is_after_eq_jiffies(a) time_after_eq(a, jiffies)
    #define time_is_after_jiffies(a) time_after(a, jiffies)
    
    #define HZ      hz
    
    extern uint64_t lkpi_nsec2hz_rem;
    extern uint64_t lkpi_nsec2hz_div;
    extern uint64_t lkpi_nsec2hz_max;
    
    extern uint64_t lkpi_usec2hz_rem;
    extern uint64_t lkpi_usec2hz_div;
    extern uint64_t lkpi_usec2hz_max;
    
    extern uint64_t lkpi_msec2hz_rem;
    extern uint64_t lkpi_msec2hz_div;
    extern uint64_t lkpi_msec2hz_max;
    
    static inline int
    timespec_to_jiffies(const struct timespec *ts)
    {
            u64 result;
    
            result = ((u64)hz * ts->tv_sec) +
                (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
            if (result > MAX_JIFFY_OFFSET)
                    result = MAX_JIFFY_OFFSET;
    
            return ((int)result);
    }
    
    static inline int
    msecs_to_jiffies(uint64_t msec)
    {
            uint64_t result;
    
            if (msec > lkpi_msec2hz_max)
                    msec = lkpi_msec2hz_max;
            result = howmany(msec * lkpi_msec2hz_rem, lkpi_msec2hz_div);
            if (result > MAX_JIFFY_OFFSET)
                    result = MAX_JIFFY_OFFSET;
    
            return ((int)result);
    }
    
    static inline int
   usecs_to_jiffies(uint64_t usec)
   {
           uint64_t result;
   
           if (usec > lkpi_usec2hz_max)
                   usec = lkpi_usec2hz_max;
           result = howmany(usec * lkpi_usec2hz_rem, lkpi_usec2hz_div);
           if (result > MAX_JIFFY_OFFSET)
                   result = MAX_JIFFY_OFFSET;
   
           return ((int)result);
   }
   
   static inline uint64_t
   nsecs_to_jiffies64(uint64_t nsec)
   {
   
           if (nsec > lkpi_nsec2hz_max)
                   nsec = lkpi_nsec2hz_max;
           return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
   }
   
   static inline unsigned long
   nsecs_to_jiffies(uint64_t nsec)
   {
   
           if (sizeof(unsigned long) >= sizeof(uint64_t)) {
                   if (nsec > lkpi_nsec2hz_max)
                           nsec = lkpi_nsec2hz_max;
           } else {
                   if (nsec > (lkpi_nsec2hz_max >> 32))
                           nsec = (lkpi_nsec2hz_max >> 32);
           }
           return (howmany(nsec * lkpi_nsec2hz_rem, lkpi_nsec2hz_div));
   }
   
   static inline uint64_t
   jiffies_to_nsecs(int j)
   {
   
           return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
   }
   
   static inline uint64_t
   jiffies_to_usecs(int j)
   {
   
           return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
   }
   
   static inline uint64_t
   get_jiffies_64(void)
   {
   
           return ((uint64_t)(unsigned int)ticks);
   }
   
   static inline int
   linux_timer_jiffies_until(int expires)
   {
           int delta = expires - jiffies;
           /* guard against already expired values */
           if (delta < 1)
                   delta = 1;
           return (delta);
   }
   
   #endif  /* _LINUXKPI_LINUX_JIFFIES_H_ */

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