2 * Copyright (c) 2015 The FreeBSD Foundation
4 * This software was developed by Konstantin Belousov
5 * under sponsorship from the FreeBSD Foundation.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
36 #include <machine/cpufunc.h>
38 #include "libc_private.h"
40 static inline uint64_t
45 __asm __volatile("mrs %0, cntvct_el0" : "=r" (reg));
49 static inline uint64_t
54 __asm __volatile("mrs %0, cntpct_el0" : "=r" (reg));
58 #pragma weak __vdso_gettc
60 __vdso_gettc(const struct vdso_timehands *th, u_int *tc)
63 if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM)
65 __asm __volatile("isb" : : : "memory");
66 *tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get();
70 #pragma weak __vdso_gettimekeep
72 __vdso_gettimekeep(struct vdso_timekeep **tk)
75 return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));