67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
|
/* Copyright (C) 2015-2016 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Contributed by Intel Corp. <walfred.tedeschi@intel.com>
|
||
|
|
|
||
|
|
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 3 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, see <http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include "x86-cpuid.h"
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#define OUR_SIZE 5
|
||
|
|
|
||
|
|
unsigned int
|
||
|
|
have_mpx (void)
|
||
|
|
{
|
||
|
|
unsigned int eax, ebx, ecx, edx;
|
||
|
|
|
||
|
|
if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if ((ecx & bit_OSXSAVE) == bit_OSXSAVE)
|
||
|
|
{
|
||
|
|
if (__get_cpuid_max (0, NULL) < 7)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
__cpuid_count (7, 0, eax, ebx, ecx, edx);
|
||
|
|
|
||
|
|
if ((ebx & bit_MPX) == bit_MPX)
|
||
|
|
return 1;
|
||
|
|
else
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
upper (int * p, int len)
|
||
|
|
{
|
||
|
|
int value;
|
||
|
|
len++; /* b0-size-test. */
|
||
|
|
value = *(p + len);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
main (void)
|
||
|
|
{
|
||
|
|
if (have_mpx ())
|
||
|
|
{
|
||
|
|
int a = 0; /* Dummy variable for debugging purposes. */
|
||
|
|
int sx[OUR_SIZE];
|
||
|
|
a++; /* register-eval. */
|
||
|
|
upper (sx, OUR_SIZE + 2);
|
||
|
|
return sx[1];
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|