1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 Brandon Bergren <bdragon@FreeBSD.org>
5 *
6 * This software was developed by Konstantin Belousov
7 * under sponsorship from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <sys/elf.h>
33 #include <sys/time.h>
34 #include <sys/vdso.h>
35
36 #include <machine/cpufunc.h>
37 #include <machine/spr.h>
38
39 #include <errno.h>
40
41 #include "libc_private.h"
42
43 #pragma weak __vdso_gettc
44 int
__vdso_gettc(const struct vdso_timehands * th,u_int * tc)45 __vdso_gettc(const struct vdso_timehands *th, u_int *tc)
46 {
47
48 if (__predict_false(th->th_algo != VDSO_TH_ALGO_PPC_TB))
49 return (ENOSYS);
50 /*
51 * While the timebase is a 64 bit quantity, we are only interested
52 * in the lower 32 bits of it.
53 */
54 *tc = mfspr(TBR_TBL);
55
56 return (0);
57 }
58
59 #pragma weak __vdso_gettimekeep
60 int
__vdso_gettimekeep(struct vdso_timekeep ** tk)61 __vdso_gettimekeep(struct vdso_timekeep **tk)
62 {
63
64 return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
65 }
66