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/* virt-what-ia64-xen-rdtsc-test
* Copyright (C) 2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ia64__
#error "error in Makefile - this program should only be compiled for ia64 host"
#endif
/* This program is ugly, but possibly the only way to detect
* virtualized Xen HVM guests on IA64.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static inline unsigned long
rdtsc (void)
{
unsigned long res;
asm volatile ("mov %0=ar.itc" : "=r"(res));
return res;
}
int
main ()
{
unsigned long old, new;
int virt;
int i;
virt = 1;
for (i = 16; i--; ) {
old = rdtsc (); new = rdtsc ();
/*printf("%ld\n", new - old);*/
if (new - old < 30) {
virt = 0;
break;
}
}
exit (virt);
}
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