diff options
Diffstat (limited to 'sysdeps/unix/i386/i586/cpuclock-init.h')
| -rw-r--r-- | sysdeps/unix/i386/i586/cpuclock-init.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sysdeps/unix/i386/i586/cpuclock-init.h b/sysdeps/unix/i386/i586/cpuclock-init.h new file mode 100644 index 0000000..ff1ff97 --- /dev/null +++ b/sysdeps/unix/i386/i586/cpuclock-init.h @@ -0,0 +1,27 @@ +/* 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)) |