1237434Skib/*- 2237434Skib * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> 3237434Skib * 4237434Skib * Redistribution and use in source and binary forms, with or without 5237434Skib * modification, are permitted provided that the following conditions 6237434Skib * are met: 7237434Skib * 1. Redistributions of source code must retain the above copyright 8237434Skib * notice, this list of conditions and the following disclaimer. 9237434Skib * 2. Redistributions in binary form must reproduce the above copyright 10237434Skib * notice, this list of conditions and the following disclaimer in the 11237434Skib * documentation and/or other materials provided with the distribution. 12237434Skib * 13237434Skib * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14237434Skib * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15237434Skib * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16237434Skib * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17237434Skib * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18237434Skib * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19237434Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20237434Skib * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21237434Skib * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22237434Skib * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23237434Skib * SUCH DAMAGE. 24237434Skib */ 25237434Skib 26237434Skib#include <sys/cdefs.h> 27237434Skib__FBSDID("$FreeBSD: releng/10.3/lib/libc/amd64/sys/__vdso_gettc.c 246117 2013-01-30 12:48:16Z kib $"); 28237434Skib 29237434Skib#include <sys/types.h> 30246117Skib#include <sys/elf.h> 31237434Skib#include <sys/time.h> 32237434Skib#include <sys/vdso.h> 33237434Skib#include <machine/cpufunc.h> 34246117Skib#include "libc_private.h" 35237434Skib 36237434Skibstatic u_int 37237434Skib__vdso_gettc_low(const struct vdso_timehands *th) 38237434Skib{ 39237434Skib uint32_t rv; 40237434Skib 41237434Skib __asm __volatile("rdtsc; shrd %%cl, %%edx, %0" 42237434Skib : "=a" (rv) : "c" (th->th_x86_shift) : "edx"); 43237434Skib return (rv); 44237434Skib} 45237434Skib 46246117Skib#pragma weak __vdso_gettc 47237434Skibu_int 48237434Skib__vdso_gettc(const struct vdso_timehands *th) 49237434Skib{ 50237434Skib 51237434Skib return (th->th_x86_shift > 0 ? __vdso_gettc_low(th) : rdtsc32()); 52237434Skib} 53246117Skib 54246117Skib#pragma weak __vdso_gettimekeep 55246117Skibint 56246117Skib__vdso_gettimekeep(struct vdso_timekeep **tk) 57246117Skib{ 58246117Skib 59246117Skib return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk))); 60246117Skib} 61