1/*	$OpenBSD: usertc.c,v 1.2 2022/11/05 16:23:02 cheloha Exp $	*/
2/*
3 * Copyright (c) 2020 Paul Irofti <paul@irofti.net>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <sys/types.h>
19#include <sys/timetc.h>
20
21static u_int
22mftbl(void)
23{
24	uint64_t value;
25	__asm volatile ("mftb %0" : "=r"(value));
26	return value;
27}
28
29static int
30tc_get_timecount(struct timekeep *tk, u_int *tc)
31{
32	switch (tk->tk_user) {
33	case TC_TB:
34		*tc = mftbl();
35		return 0;
36	}
37	return -1;
38}
39
40int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount;
41