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94ff04b536
The time returned by sys$clock_gettime() was not aligned with the delay calculations in sys$clock_nanosleep(). This patch fixes that by taking the system's ticks_per_second value into account in both functions. This patch also removes the need for Thread::sleep_until() and uses Thread::sleep() for both absolute and relative sleeps. This was causing the nesalizer emulator port to sleep for a negative amount of time at the end of each frame, making it run way too fast.
163 lines
5.1 KiB
C++
163 lines
5.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Time.h>
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#include <Kernel/Process.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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int Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
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{
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REQUIRE_PROMISE(stdio);
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timespec ts = {};
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switch (clock_id) {
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case CLOCK_MONOTONIC: {
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auto ticks_per_second = TimeManagement::the().ticks_per_second();
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auto uptime = g_uptime;
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ts.tv_sec = uptime / ticks_per_second;
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ts.tv_nsec = (1000000000 * (uptime % ticks_per_second)) / ticks_per_second;
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break;
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}
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case CLOCK_REALTIME:
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ts = TimeManagement::the().epoch_time();
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break;
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default:
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return -EINVAL;
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}
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if (!copy_to_user(user_ts, &ts))
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return -EFAULT;
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return 0;
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}
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int Process::sys$clock_settime(clockid_t clock_id, Userspace<const timespec*> user_ts)
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{
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REQUIRE_PROMISE(settime);
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if (!is_superuser())
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return -EPERM;
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timespec ts;
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if (!copy_from_user(&ts, user_ts))
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return -EFAULT;
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switch (clock_id) {
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case CLOCK_REALTIME:
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TimeManagement::the().set_epoch_time(ts);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int Process::sys$clock_nanosleep(Userspace<const Syscall::SC_clock_nanosleep_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_clock_nanosleep_params params;
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if (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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timespec requested_sleep;
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if (!copy_from_user(&requested_sleep, params.requested_sleep))
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return -EFAULT;
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bool is_absolute = params.flags & TIMER_ABSTIME;
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auto ticks_per_second = TimeManagement::the().ticks_per_second();
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switch (params.clock_id) {
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case CLOCK_MONOTONIC: {
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u64 ticks_to_sleep = requested_sleep.tv_sec * ticks_per_second;
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ticks_to_sleep += (requested_sleep.tv_nsec * ticks_per_second) / 1000000000;
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if (is_absolute)
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ticks_to_sleep -= g_uptime;
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if (!ticks_to_sleep)
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return 0;
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u64 wakeup_time = Thread::current()->sleep(ticks_to_sleep);
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if (wakeup_time > g_uptime) {
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u64 ticks_left = wakeup_time - g_uptime;
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if (!is_absolute && params.remaining_sleep) {
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timespec remaining_sleep = {};
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remaining_sleep.tv_sec = ticks_left / ticks_per_second;
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ticks_left -= remaining_sleep.tv_sec * ticks_per_second;
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remaining_sleep.tv_nsec = (ticks_left * 1000000000) / ticks_per_second;
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if (!copy_to_user(params.remaining_sleep, &remaining_sleep))
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return -EFAULT;
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}
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return -EINTR;
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}
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return 0;
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}
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default:
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return -EINVAL;
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}
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}
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int Process::sys$adjtime(Userspace<const timeval*> user_delta, Userspace<timeval*> user_old_delta)
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{
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if (user_old_delta) {
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timespec old_delta_ts = TimeManagement::the().remaining_epoch_time_adjustment();
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timeval old_delta;
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timespec_to_timeval(old_delta_ts, old_delta);
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if (!copy_to_user(user_old_delta, &old_delta))
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return -EFAULT;
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}
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if (user_delta) {
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REQUIRE_PROMISE(settime);
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if (!is_superuser())
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return -EPERM;
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timeval delta;
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if (!copy_from_user(&delta, user_delta))
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return -EFAULT;
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if (delta.tv_usec < 0 || delta.tv_usec >= 1'000'000)
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return -EINVAL;
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timespec delta_ts;
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timeval_to_timespec(delta, delta_ts);
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TimeManagement::the().set_remaining_epoch_time_adjustment(delta_ts);
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}
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return 0;
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}
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int Process::sys$gettimeofday(Userspace<timeval*> user_tv)
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{
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REQUIRE_PROMISE(stdio);
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auto tv = kgettimeofday();
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if (!copy_to_user(user_tv, &tv))
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return -EFAULT;
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return 0;
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}
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}
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