cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

qemu-timer-common.c (1930B)

      1/*
      2 * QEMU System Emulator
      3 *
      4 * Copyright (c) 2003-2008 Fabrice Bellard
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24#include "qemu/osdep.h"
     25#include "qemu/timer.h"
     26
     27/***********************************************************/
     28/* real time host monotonic timer */
     29
     30int64_t clock_start;
     31
     32#ifdef _WIN32
     33
     34int64_t clock_freq;
     35
     36static void __attribute__((constructor)) init_get_clock(void)
     37{
     38    LARGE_INTEGER freq;
     39    int ret;
     40    ret = QueryPerformanceFrequency(&freq);
     41    if (ret == 0) {
     42        fprintf(stderr, "Could not calibrate ticks\n");
     43        exit(1);
     44    }
     45    clock_freq = freq.QuadPart;
     46    clock_start = get_clock();
     47}
     48
     49#else
     50
     51int use_rt_clock;
     52
     53static void __attribute__((constructor)) init_get_clock(void)
     54{
     55    struct timespec ts;
     56
     57    use_rt_clock = 0;
     58    if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
     59        use_rt_clock = 1;
     60    }
     61    clock_start = get_clock();
     62}
     63#endif