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/* $OpenBSD: usertc.c,v 1.2 2020/07/08 09:20:28 kettenis Exp $ */
/*
* Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org>
*
* 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
tick_get_timecount(struct timecounter *tc)
{
u_int64_t tick;
__asm volatile("rd %%tick, %0" : "=r" (tick));
return (tick & ~0u);
}
static inline u_int
sys_tick_get_timecount(struct timecounter *tc)
{
u_int64_t tick;
__asm volatile("rd %%sys_tick, %0" : "=r" (tick));
return (tick & ~0u);
}
static int
tc_get_timecount(struct timekeep *tk, u_int *tc)
{
switch (tk->tk_user) {
case TC_TICK:
*tc = tick_get_timecount(NULL);
return 0;
case TC_SYS_TICK:
*tc = sys_tick_get_timecount(NULL);
return 0;
}
return -1;
}
int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount;
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