blob: ff1ff9752a58869b1ba1b9912d062fffd029934b (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
/* x86 TSC based CPU clock initialization code.
Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* The TSC value has 64 bits. */
#define CPUCLOCK_VARDEF(name) unsigned long long int name
/* A declaration. */
#define CPUCLOCK_VARDECL(name) extern unsigned long long int name
/* Reading the TSC value is a simple instruction. */
#define CPUCLOCK_INIT(name) asm volatile ("rdtsc" : "=A" (name))
|
