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/* 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));
}
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