4d3d4ecca0
With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
/*
|
|
* \brief Timer driver for core
|
|
* \author Reto Buerki
|
|
* \author Martin Stein
|
|
* \date 2015-04-14
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2015-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
/* base includes */
|
|
#include <base/log.h>
|
|
|
|
/* core includes */
|
|
#include <kernel/timer.h>
|
|
#include <platform.h>
|
|
#include <board.h>
|
|
#include <sinfo_instance.h>
|
|
|
|
using namespace Genode;
|
|
using namespace Kernel;
|
|
|
|
|
|
Timer_driver::Timer_driver(unsigned) : ticks_per_ms(sinfo()->get_tsc_khz())
|
|
{
|
|
/* first sinfo instance, output status */
|
|
sinfo()->log_status();
|
|
|
|
struct Sinfo::Memregion_info region;
|
|
if (!sinfo()->get_memregion_info("timed_event", ®ion)) {
|
|
error("muen-timer: Unable to retrieve timed event region");
|
|
throw Invalid_region();
|
|
}
|
|
|
|
event_page = (Subject_timed_event *)Platform::mmio_to_virt(region.address);
|
|
event_page->event_nr = Board::TIMER_EVENT_KERNEL;
|
|
log("muen-timer: Page @", Hex(region.address), ", "
|
|
"frequency ", ticks_per_ms, " kHz, "
|
|
"event ", (unsigned)event_page->event_nr);
|
|
|
|
if (sinfo()->get_memregion_info("monitor_timed_event", ®ion)) {
|
|
log("muen-timer: Found guest timed event page @", Hex(region.address),
|
|
" -> enabling preemption");
|
|
guest_event_page = (Subject_timed_event *)Platform::mmio_to_virt(region.address);
|
|
guest_event_page->event_nr = Board::TIMER_EVENT_PREEMPT;
|
|
}
|
|
}
|
|
|
|
|
|
void Timer::init_cpu_local() { }
|
|
|
|
|
|
unsigned Timer::interrupt_id() const {
|
|
return Board::TIMER_VECTOR_KERNEL; }
|
|
|
|
|
|
void Timer::_start_one_shot(time_t const ticks)
|
|
{
|
|
const uint64_t t = _driver.rdtsc() + ticks;
|
|
_driver.event_page->tsc_trigger = t;
|
|
|
|
if (_driver.guest_event_page)
|
|
_driver.guest_event_page->tsc_trigger = t;
|
|
}
|
|
|
|
|
|
time_t Timer::_ticks_to_us(time_t const ticks) const {
|
|
return (ticks / _driver.ticks_per_ms) * 1000; }
|
|
|
|
|
|
time_t Timer::us_to_ticks(time_t const us) const {
|
|
return (us / 1000) * _driver.ticks_per_ms; }
|
|
|
|
|
|
time_t Timer::_max_value() const {
|
|
return (time_t)~0; }
|
|
|
|
|
|
time_t Timer::_value()
|
|
{
|
|
const uint64_t now = _driver.rdtsc();
|
|
if (_driver.event_page->tsc_trigger != Driver::TIMER_DISABLED
|
|
&& _driver.event_page->tsc_trigger > now)
|
|
{
|
|
return _driver.event_page->tsc_trigger - now;
|
|
}
|
|
return 0;
|
|
}
|