cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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timed-average.h (2303B)

      1/*
      2 * QEMU timed average computation
      3 *
      4 * Copyright (C) Nodalink, EURL. 2014
      5 * Copyright (C) Igalia, S.L. 2015
      6 *
      7 * Authors:
      8 *   Benoît Canet <benoit.canet@nodalink.com>
      9 *   Alberto Garcia <berto@igalia.com>
     10 *
     11 * This program is free software: you can redistribute it and/or modify
     12 * it under the terms of the GNU General Public License as published by
     13 * the Free Software Foundation, either version 2 of the License, or
     14 * (at your option) version 3 or any later version.
     15 *
     16 * This program is distributed in the hope that it will be useful,
     17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     19 * GNU General Public License for more details.
     20 *
     21 * You should have received a copy of the GNU General Public License
     22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     23 */
     24
     25#ifndef TIMED_AVERAGE_H
     26#define TIMED_AVERAGE_H
     27
     28
     29#include "qemu/timer.h"
     30
     31typedef struct TimedAverageWindow TimedAverageWindow;
     32typedef struct TimedAverage TimedAverage;
     33
     34/* All fields of both structures are private */
     35
     36struct TimedAverageWindow {
     37    uint64_t      min;             /* minimum value accounted in the window */
     38    uint64_t      max;             /* maximum value accounted in the window */
     39    uint64_t      sum;             /* sum of all values */
     40    uint64_t      count;           /* number of values */
     41    int64_t       expiration;      /* the end of the current window in ns */
     42};
     43
     44struct TimedAverage {
     45    uint64_t           period;     /* period in nanoseconds */
     46    TimedAverageWindow windows[2]; /* two overlapping windows of with
     47                                    * an offset of period / 2 between them */
     48    unsigned           current;    /* the current window index: it's also the
     49                                    * oldest window index */
     50    QEMUClockType      clock_type; /* the clock used */
     51};
     52
     53void timed_average_init(TimedAverage *ta, QEMUClockType clock_type,
     54                        uint64_t period);
     55
     56void timed_average_account(TimedAverage *ta, uint64_t value);
     57
     58uint64_t timed_average_min(TimedAverage *ta);
     59uint64_t timed_average_avg(TimedAverage *ta);
     60uint64_t timed_average_max(TimedAverage *ta);
     61uint64_t timed_average_sum(TimedAverage *ta, uint64_t *elapsed);
     62
     63#endif