1 /* $OpenBSD: usertc.c,v 1.3 2021/07/25 22:58:39 jca Exp $ */
2 /*
3 * Copyright (c) 2020 Visa Hankala
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_int
get_cp0_count(void)22 get_cp0_count(void)
23 {
24 uint32_t count;
25
26 __asm volatile (
27 " .set push\n"
28 " .set mips64r2\n"
29 " rdhwr %0, $2\n"
30 " .set pop\n"
31 : "=r" (count));
32
33 return count;
34 }
35
36 static int
tc_get_timecount(struct timekeep * tk,u_int * tc)37 tc_get_timecount(struct timekeep *tk, u_int *tc)
38 {
39 switch (tk->tk_user) {
40 case TC_CP0_COUNT:
41 *tc = get_cp0_count();
42 return 0;
43 }
44
45 return -1;
46 }
47
48 int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount;
49