mirror of
https://github.com/kasmtech/KasmVNC.git
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71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/* Copyright (C) 2021 Kasm Web
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software 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 software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <stdint.h>
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static uint32_t cpuid[4] = { 0 };
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static uint32_t extcpuid[4] = { 0 };
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static void getcpuid() {
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if (cpuid[0])
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return;
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#if defined(__x86_64__) || defined(__i386__)
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uint32_t eax, ecx = 0;
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eax = 1; // normal feature bits
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__asm__ __volatile__(
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"cpuid\n\t"
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: "=a"(cpuid[0]), "=b"(cpuid[1]), "=c"(cpuid[2]), "=d"(cpuid[3])
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: "0"(eax), "2"(ecx)
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);
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eax = 7; // ext feature bits
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ecx = 0;
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__asm__ __volatile__(
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"cpuid\n\t"
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: "=a"(extcpuid[0]), "=b"(extcpuid[1]), "=c"(extcpuid[2]), "=d"(extcpuid[3])
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: "0"(eax), "2"(ecx)
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);
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#endif
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}
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namespace rfb {
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bool supportsSSE2() {
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getcpuid();
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#if defined(__x86_64__) || defined(__i386__)
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#define bit_SSE2 (1 << 26)
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return cpuid[3] & bit_SSE2;
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#endif
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return false;
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}
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bool supportsAVX512f() {
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getcpuid();
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#if defined(__x86_64__) || defined(__i386__)
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#define bit_AVX512f (1 << 16)
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return extcpuid[1] & bit_AVX512f;
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#endif
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return false;
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}
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}; // namespace rfb
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