/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * libcfs/include/libcfs/winnt/winnt-time.h
 *
 * Implementation of portable time API for Winnt (kernel and user-level).
 */

#ifndef __LIBCFS_WINNT_LINUX_TIME_H__
#define __LIBCFS_WINNT_LINUX_TIME_H__

#ifndef __LIBCFS_LIBCFS_H__
#error Do not #include this file directly. #include <libcfs/libcfs.h> instead
#endif

/* Portable time API */

/*
 * Platform provides three opaque data-types:
 *
 *  cfs_time_t        represents point in time. This is internal kernel
 *                    time rather than "wall clock". This time bears no
 *                    relation to gettimeofday().
 *
 *  cfs_duration_t    represents time interval with resolution of internal
 *                    platform clock
 *
 *  cfs_fs_time_t     represents instance in world-visible time. This is
 *                    used in file-system time-stamps
 *
 *  cfs_time_t     cfs_time_current(void);
 *  cfs_time_t     cfs_time_add    (cfs_time_t, cfs_duration_t);
 *  cfs_duration_t cfs_time_sub    (cfs_time_t, cfs_time_t);
 *  int            cfs_time_before (cfs_time_t, cfs_time_t);
 *  int            cfs_time_beforeq(cfs_time_t, cfs_time_t);
 *
 *  cfs_duration_t cfs_duration_build(int64_t);
 *
 *  time_t         cfs_duration_sec (cfs_duration_t);
 *  void           cfs_duration_usec(cfs_duration_t, struct timeval *);
 *  void           cfs_duration_nsec(cfs_duration_t, struct timespec *);
 *
 *  void           cfs_fs_time_current(cfs_fs_time_t *);
 *  time_t         cfs_fs_time_sec    (cfs_fs_time_t *);
 *  void           cfs_fs_time_usec   (cfs_fs_time_t *, struct timeval *);
 *  void           cfs_fs_time_nsec   (cfs_fs_time_t *, struct timespec *);
 *  int            cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
 *  int            cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
 *
 *  CFS_TIME_FORMAT
 *  CFS_DURATION_FORMAT
 *
 */

struct timeval {
    time_t      tv_sec;   /* seconds */
    suseconds_t tv_usec;  /* microseconds */
};

typedef time_t cfs_time_t;
typedef time_t cfs_duration_t;

#ifdef __KERNEL__

#include <libcfs/winnt/portals_compat25.h>

#define CFS_HZ (100)

struct timespec {
    __u32   tv_sec;
    __u32   tv_nsec;
};
typedef struct timeval cfs_fs_time_t;


#define ONE_BILLION ((u_int64_t)1000000000)
#define ONE_MILLION ((u_int64_t)   1000000)

/*
 * Generic kernel stuff
 */

#define jiffies     (ULONG_PTR)JIFFIES()
#define cfs_jiffies (ULONG_PTR)JIFFIES()

static inline void cfs_gettimeofday(struct timeval *tv)
{
    LARGE_INTEGER Time;

    KeQuerySystemTime(&Time);

    tv->tv_sec  = (time_t) (Time.QuadPart / 10000000);
    tv->tv_usec = (suseconds_t) (Time.QuadPart % 10000000) / 10;
}

static inline LONGLONG JIFFIES()
{
    LARGE_INTEGER Tick;
    LARGE_INTEGER Elapse;

    KeQueryTickCount(&Tick);

    Elapse.QuadPart  = Tick.QuadPart * KeQueryTimeIncrement();
    Elapse.QuadPart /= (10000000 / CFS_HZ);

    return Elapse.QuadPart;
}

static inline cfs_time_t cfs_time_current(void)
{
    return (cfs_time_t)JIFFIES();
}

static inline time_t cfs_time_current_sec(void)
{
    return (time_t)(JIFFIES() / CFS_HZ);
}

#define cfs_time_before(t1, t2) (((signed)(t1) - (signed)(t2)) < 0)
#define cfs_time_beforeq(t1, t2) (((signed)(t1) - (signed)(t2)) <= 0)

static inline void cfs_fs_time_current(cfs_fs_time_t *t)
{
    ULONG         Linux;
    LARGE_INTEGER Sys;

    KeQuerySystemTime(&Sys);

    RtlTimeToSecondsSince1970(&Sys, &Linux);

    t->tv_sec  = Linux;
    t->tv_usec = (Sys.LowPart % 10000000) / 10;
}

static inline unsigned long get_seconds(void)
{
    cfs_fs_time_t t;
    cfs_fs_time_current(&t);
    return (unsigned long) t.tv_sec;
}

static inline cfs_time_t cfs_fs_time_sec(cfs_fs_time_t *t)
{
    return (cfs_time_t)t->tv_sec;
}

static inline unsigned long __cfs_fs_time_flat(cfs_fs_time_t *t)
{
    return (unsigned long)(t->tv_sec) * ONE_MILLION + t->tv_usec;
}

static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
{
    return (__cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2));
}

static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
{
    return (__cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2));
}

static inline cfs_duration_t cfs_time_seconds(cfs_duration_t seconds)
{
    return  (cfs_duration_t)(seconds * CFS_HZ);
}

static inline time_t cfs_duration_sec(cfs_duration_t d)
{
    return (time_t)(d / CFS_HZ);
}

static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
{
    s->tv_sec = (__u32)(d / CFS_HZ);
    s->tv_usec = (__u32)((d - (cfs_duration_t)s->tv_sec * CFS_HZ) *
                              ONE_MILLION / CFS_HZ);
}

static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
{
    s->tv_sec = (__u32) (d / CFS_HZ);
    s->tv_nsec = (__u32)((d - (cfs_duration_t)s->tv_sec * CFS_HZ) *
                           ONE_BILLION / CFS_HZ);
}

static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
{
    *v = *t;
}

static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
{
    s->tv_sec  = (__u32) t->tv_sec;
    s->tv_nsec = (__u32) t->tv_usec * 1000;
}


#define cfs_time_current_64 JIFFIES

static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
{
    return t + d;
}

static inline __u64 cfs_time_shift_64(cfs_duration_t seconds)
{
    return cfs_time_add_64(cfs_time_current_64(),
                           cfs_time_seconds(seconds));
}

static inline int cfs_time_before_64(__u64 t1, __u64 t2)
{
    return (__s64)t2 - (__s64)t1 > 0;
}

static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
{
    return (__s64)t2 - (__s64)t1 >= 0;
}

/*
 * One jiffy
 */
#define CFS_TICK                (1)
#define LTIME_S(t)		        *((__u64 *)&(t))

#define CFS_TIME_T              "%u"
#define CFS_DURATION_T          "%d"

#else   /* !__KERNEL__ */

#include <time.h>
#ifdef HAVE_PTHREAD
#include <pthread.h>
#else
struct timespec {
    unsigned long tv_sec;
    unsigned long tv_nsec;
};
#endif /* HAVE_THREAD */

#include "../user-time.h"

/* liblustre. time(2) based implementation. */
int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
void sleep(int time);
void cfs_gettimeofday(struct timeval *tv);
int gettimeofday(struct timeval *tv, void * tz);

#endif /* !__KERNEL__ */

/* __LIBCFS_LINUX_LINUX_TIME_H__ */
#endif
/*
 * Local variables:
 * c-indentation-style: "K&R"
 * c-basic-offset: 8
 * tab-width: 8
 * fill-column: 80
 * scroll-step: 1
 * End:
 */