1237434Skib/*- 2291937Skib * Copyright (c) 2015 The FreeBSD Foundation 3237434Skib * 4291937Skib * This software was developed by Konstantin Belousov 5291937Skib * under sponsorship from the FreeBSD Foundation. 6291937Skib * 7237434Skib * Redistribution and use in source and binary forms, with or without 8237434Skib * modification, are permitted provided that the following conditions 9237434Skib * are met: 10237434Skib * 1. Redistributions of source code must retain the above copyright 11237434Skib * notice, this list of conditions and the following disclaimer. 12237434Skib * 2. Redistributions in binary form must reproduce the above copyright 13237434Skib * notice, this list of conditions and the following disclaimer in the 14237434Skib * documentation and/or other materials provided with the distribution. 15237434Skib * 16237434Skib * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17237434Skib * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18237434Skib * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19237434Skib * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20237434Skib * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21237434Skib * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22237434Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23237434Skib * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24237434Skib * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25237434Skib * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26237434Skib * SUCH DAMAGE. 27237434Skib */ 28237434Skib 29237434Skib#include <sys/cdefs.h> 30237434Skib__FBSDID("$FreeBSD$"); 31237434Skib 32237434Skib#include <sys/types.h> 33246117Skib#include <sys/elf.h> 34237434Skib#include <sys/time.h> 35237434Skib#include <sys/vdso.h> 36237434Skib#include <machine/cpufunc.h> 37292709Skib#include <machine/acle-compat.h> 38305866Skib#include <errno.h> 39246117Skib#include "libc_private.h" 40237434Skib 41292709Skib#if __ARM_ARCH >= 6 42291937Skibstatic inline uint64_t 43291937Skibcp15_cntvct_get(void) 44237434Skib{ 45291937Skib uint64_t reg; 46237434Skib 47291937Skib __asm __volatile("mrrc\tp15, 1, %Q0, %R0, c14" : "=r" (reg)); 48291937Skib return (reg); 49237434Skib} 50237434Skib 51291937Skibstatic inline uint64_t 52291937Skibcp15_cntpct_get(void) 53286284Skib{ 54291937Skib uint64_t reg; 55286284Skib 56291937Skib __asm __volatile("mrrc\tp15, 0, %Q0, %R0, c14" : "=r" (reg)); 57291937Skib return (reg); 58286284Skib} 59292709Skib#endif 60286284Skib 61246117Skib#pragma weak __vdso_gettc 62305866Skibint 63305866Skib__vdso_gettc(const struct vdso_timehands *th, u_int *tc) 64237434Skib{ 65237434Skib 66305866Skib if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM) 67305866Skib return (ENOSYS); 68292709Skib#if __ARM_ARCH >= 6 69291937Skib /* 70291937Skib * Userspace gettimeofday() is only enabled on ARMv7 CPUs, but 71291937Skib * libc is compiled for ARMv6. Due to clang issues, .arch 72291937Skib * armv7-a directive does not work. 73291937Skib */ 74291937Skib __asm __volatile(".word\t0xf57ff06f" : : : "memory"); /* isb */ 75305866Skib *tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get(); 76305866Skib return (0); 77292709Skib#else 78305866Skib *tc = 0; 79305866Skib return (ENOSYS); 80292709Skib#endif 81237434Skib} 82246117Skib 83246117Skib#pragma weak __vdso_gettimekeep 84246117Skibint 85246117Skib__vdso_gettimekeep(struct vdso_timekeep **tk) 86246117Skib{ 87246117Skib 88246117Skib return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk))); 89246117Skib} 90