mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-12-01 20:43:12 +01:00
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/* Copyright (C) 2021 Kasm Web
|
|
*
|
|
* This 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 software 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 software; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
* USA.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
static uint32_t cpuid[4] = { 0 };
|
|
static uint32_t extcpuid[4] = { 0 };
|
|
|
|
static void getcpuid() {
|
|
if (cpuid[0])
|
|
return;
|
|
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
uint32_t eax, ecx = 0;
|
|
|
|
eax = 1; // normal feature bits
|
|
|
|
__asm__ __volatile__(
|
|
"cpuid\n\t"
|
|
: "=a"(cpuid[0]), "=b"(cpuid[1]), "=c"(cpuid[2]), "=d"(cpuid[3])
|
|
: "0"(eax), "2"(ecx)
|
|
);
|
|
|
|
eax = 7; // ext feature bits
|
|
ecx = 0;
|
|
|
|
__asm__ __volatile__(
|
|
"cpuid\n\t"
|
|
: "=a"(extcpuid[0]), "=b"(extcpuid[1]), "=c"(extcpuid[2]), "=d"(extcpuid[3])
|
|
: "0"(eax), "2"(ecx)
|
|
);
|
|
#endif
|
|
}
|
|
|
|
namespace rfb {
|
|
|
|
bool supportsSSE2() {
|
|
getcpuid();
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
#define bit_SSE2 (1 << 26)
|
|
return cpuid[3] & bit_SSE2;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
bool supportsAVX512f() {
|
|
getcpuid();
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
#define bit_AVX512f (1 << 16)
|
|
return extcpuid[1] & bit_AVX512f;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
}; // namespace rfb
|