forked from osmocom/wireshark
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* ws_cpuid.h
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* Get the CPU info
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Get CPU info on platforms where the cpuid instruction can be used skip 32 bit versions for GCC
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* http://www.intel.com/content/dam/www/public/us/en/documents/application-notes/processor-identification-cpuid-instruction-note.pdf
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* the ws_cpuid() routine will return 0 if cpuinfo isn't available.
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*/
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#if defined(_MSC_VER) /* MSVC */
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static int
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ws_cpuid(guint32 *CPUInfo, guint32 selector)
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{
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CPUInfo[0] = CPUInfo[1] = CPUInfo[2] = CPUInfo[3] = 0;
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__cpuid((int *) CPUInfo, selector);
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/* XXX, how to check if it's supported on MSVC? just in case clear all flags above */
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return 1;
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}
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#elif defined(__GNUC__) /* GCC/clang */
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#if defined(__x86_64__)
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static inline int
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ws_cpuid(guint32 *CPUInfo, int selector)
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{
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__asm__ __volatile__("cpuid"
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: "=a" (CPUInfo[0]),
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"=b" (CPUInfo[1]),
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"=c" (CPUInfo[2]),
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"=d" (CPUInfo[3])
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: "a"(selector));
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return 1;
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}
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#else /* (__i386__) */
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static int
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ws_cpuid(guint32 *CPUInfo _U_, int selector _U_)
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{
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/* TODO: need a test if older proccesors have the cpuid instruction */
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return 0;
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}
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#endif
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#else /* Other compilers */
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static int
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ws_cpuid(guint32 *CPUInfo _U_, int selector _U_)
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{
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return 0;
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}
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#endif
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static int
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ws_cpuid_sse42(void)
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{
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guint32 CPUInfo[4];
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if (!ws_cpuid(CPUInfo, 1))
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return 0;
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/* in ECX bit 20 toggled on */
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return (CPUInfo[2] & (1 << 20));
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}
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