diff options
Diffstat (limited to 'lib/libc/amd64')
| -rw-r--r-- | lib/libc/amd64/sys/Makefile.inc | 3 | ||||
| -rw-r--r-- | lib/libc/amd64/sys/__vdso_gettc.c | 49 |
2 files changed, 51 insertions, 1 deletions
diff --git a/lib/libc/amd64/sys/Makefile.inc b/lib/libc/amd64/sys/Makefile.inc index c7b17e0..51583d3 100644 --- a/lib/libc/amd64/sys/Makefile.inc +++ b/lib/libc/amd64/sys/Makefile.inc @@ -1,7 +1,8 @@ # from: Makefile.inc,v 1.1 1993/09/03 19:04:23 jtc Exp # $FreeBSD$ -SRCS+= amd64_get_fsbase.c amd64_get_gsbase.c amd64_set_fsbase.c amd64_set_gsbase.c +SRCS+= amd64_get_fsbase.c amd64_get_gsbase.c amd64_set_fsbase.c \ + amd64_set_gsbase.c __vdso_gettc.c MDASM= vfork.S brk.S cerror.S exect.S getcontext.S pipe.S ptrace.S \ reboot.S sbrk.S setlogin.S sigreturn.S diff --git a/lib/libc/amd64/sys/__vdso_gettc.c b/lib/libc/amd64/sys/__vdso_gettc.c new file mode 100644 index 0000000..091fe26 --- /dev/null +++ b/lib/libc/amd64/sys/__vdso_gettc.c @@ -0,0 +1,49 @@ +/*- + * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/vdso.h> +#include <machine/cpufunc.h> + +static u_int +__vdso_gettc_low(const struct vdso_timehands *th) +{ + uint32_t rv; + + __asm __volatile("rdtsc; shrd %%cl, %%edx, %0" + : "=a" (rv) : "c" (th->th_x86_shift) : "edx"); + return (rv); +} + +u_int +__vdso_gettc(const struct vdso_timehands *th) +{ + + return (th->th_x86_shift > 0 ? __vdso_gettc_low(th) : rdtsc32()); +} |
