1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <sys/types.h>
35#include <sys/elf.h>
36#include <sys/time.h>
37#include <sys/vdso.h>
38
39#include <machine/cpufunc.h>
40#include <machine/spr.h>
41
42#include <errno.h>
43
44#include "libc_private.h"
45
46#pragma weak __vdso_gettc
47int
48__vdso_gettc(const struct vdso_timehands *th, u_int *tc)
49{
50
51	if (__predict_false(th->th_algo != VDSO_TH_ALGO_PPC_TB))
52	    return (ENOSYS);
53	/*
54	 * While the timebase is a 64 bit quantity, we are only interested
55	 * in the lower 32 bits of it.
56	 */
57	*tc = mfspr(TBR_TBL);
58
59	return (0);
60}
61
62#pragma weak __vdso_gettimekeep
63int
64__vdso_gettimekeep(struct vdso_timekeep **tk)
65{
66
67	return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
68}
69