forked from osmocom/wireshark
![Alexis La Goutte](/assets/img/avatar_default.png)
Change-Id: Ic0b0d5392ff049cc51f05b79fc5feae190064ce8 Reviewed-on: https://code.wireshark.org/review/2097 Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* ws_cpuid.h
|
|
* Get the CPU info
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
/*
|
|
* Get CPU info on platforms where the cpuid instruction can be used skip 32 bit versions for GCC
|
|
* http://www.intel.com/content/dam/www/public/us/en/documents/application-notes/processor-identification-cpuid-instruction-note.pdf
|
|
* the ws_cpuid() routine will return 0 if cpuinfo isn't available.
|
|
*/
|
|
|
|
#if defined(_MSC_VER) /* MSVC */
|
|
static int
|
|
ws_cpuid(guint32 *CPUInfo, guint32 selector)
|
|
{
|
|
CPUInfo[0] = CPUInfo[1] = CPUInfo[2] = CPUInfo[3] = 0;
|
|
__cpuid((int *) CPUInfo, selector);
|
|
/* XXX, how to check if it's supported on MSVC? just in case clear all flags above */
|
|
return 1;
|
|
}
|
|
|
|
#elif defined(__GNUC__) /* GCC/clang */
|
|
|
|
#if defined(__x86_64__)
|
|
static inline int
|
|
ws_cpuid(guint32 *CPUInfo, int selector)
|
|
{
|
|
__asm__ __volatile__("cpuid"
|
|
: "=a" (CPUInfo[0]),
|
|
"=b" (CPUInfo[1]),
|
|
"=c" (CPUInfo[2]),
|
|
"=d" (CPUInfo[3])
|
|
: "a"(selector));
|
|
return 1;
|
|
}
|
|
#else /* (__i386__) */
|
|
|
|
static int
|
|
ws_cpuid(guint32 *CPUInfo _U_, int selector _U_)
|
|
{
|
|
/* TODO: need a test if older proccesors have the cpuid instruction */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#else /* Other compilers */
|
|
|
|
static int
|
|
ws_cpuid(guint32 *CPUInfo _U_, int selector _U_)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ws_cpuid_sse42(void)
|
|
{
|
|
guint32 CPUInfo[4];
|
|
|
|
if (!ws_cpuid(CPUInfo, 1))
|
|
return 0;
|
|
|
|
/* in ECX bit 20 toggled on */
|
|
return (CPUInfo[2] & (1 << 20));
|
|
}
|