1 /* $OpenBSD: usertc.c,v 1.2 2020/07/17 20:15:43 gkoehler 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
21 static __inline u_int32_t
ppc_mftbl(void)22 ppc_mftbl (void)
23 {
24 int ret;
25 __asm volatile ("mftb %0" : "=r" (ret));
26 return ret;
27 }
28
29 static int
tc_get_timecount(struct timekeep * tk,u_int * tc)30 tc_get_timecount(struct timekeep *tk, u_int *tc)
31 {
32 switch (tk->tk_user) {
33 case TC_TB:
34 *tc = ppc_mftbl();
35 return 0;
36 }
37
38 return -1;
39 }
40
41 int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount;
42