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/* $OpenBSD: usertc.c,v 1.3 2020/08/23 21:38:47 cheloha Exp $ */
/*
* Copyright (c) 2020 Paul Irofti <paul@irofti.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/timetc.h>
static inline u_int
rdtsc_lfence(void)
{
uint32_t hi, lo;
asm volatile("lfence; rdtsc" : "=a"(lo), "=d"(hi));
return ((uint64_t)lo)|(((uint64_t)hi)<<32);
}
static int
tc_get_timecount(struct timekeep *tk, u_int *tc)
{
switch (tk->tk_user) {
case TC_TSC:
*tc = rdtsc_lfence();
return 0;
}
return -1;
}
int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount;
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