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/*
* Copyright (c) 2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#include <csignal>
#include <ctime>
#include "base/misc.hh"
#include "base/trace.hh"
#include "cpu/kvm/timer.hh"
#include "debug/KvmTimer.hh"
PosixKvmTimer::PosixKvmTimer(int signo, clockid_t clockID,
float hostFactor, Tick hostFreq)
: BaseKvmTimer(signo, hostFactor, hostFreq),
clockID(clockID)
{
struct sigevent sev;
// TODO: We should request signal delivery to thread instead of
// the process here. Unfortunately this seems to be broken, or at
// least not work as specified in the man page.
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = signo;
sev.sigev_value.sival_ptr = NULL;
if (timer_create(clockID, &sev, &timer) == -1)
panic("timer_create");
}
PosixKvmTimer::~PosixKvmTimer()
{
timer_delete(timer);
}
void
PosixKvmTimer::arm(Tick ticks)
{
struct itimerspec ts;
memset(&ts, 0, sizeof(ts));
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
ts.it_value.tv_sec = hostNs(ticks) / 1000000000ULL;
ts.it_value.tv_nsec = hostNs(ticks) % 1000000000ULL;
DPRINTF(KvmTimer, "Arming POSIX timer: %i ticks (%is%ins)\n",
ticks, ts.it_value.tv_sec, ts.it_value.tv_nsec);
if (timer_settime(timer, 0, &ts, NULL) == -1)
panic("PosixKvmTimer: Failed to arm timer\n");
}
void
PosixKvmTimer::disarm()
{
struct itimerspec ts;
memset(&ts, 0, sizeof(ts));
DPRINTF(KvmTimer, "Disarming POSIX timer\n");
if (timer_settime(timer, 0, &ts, NULL) == -1)
panic("PosixKvmTimer: Failed to disarm timer\n");
}
Tick
PosixKvmTimer::calcResolution()
{
struct timespec ts;
if (clock_getres(clockID, &ts) == -1)
panic("PosixKvmTimer: Failed to get timer resolution\n");
Tick resolution(ticksFromHostNs(ts.tv_sec * 1000000000ULL + ts.tv_nsec));
return resolution;
}
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