58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
/*
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* \brief Timer driver for core
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* \author Sebastian Sumpf
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* \date 2015-08-22
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Core includes */
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#include <kernel/timer.h>
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#include <hw/spec/riscv/machine_call.h>
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using namespace Genode;
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using namespace Kernel;
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Timer_driver::Timer_driver(unsigned)
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{
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/* enable timer interrupt */
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enum { STIE = 0x20 };
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asm volatile ("csrs sie, %0" : : "r"(STIE));
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}
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void Timer::_start_one_shot(time_t const ticks)
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{
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_driver.timeout = _driver.stime() + ticks;
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Hw::set_sys_timer(_driver.timeout);
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}
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time_t Timer::_ticks_to_us(time_t const ticks) const {
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return (ticks / Driver::TICS_PER_MS) * 1000; }
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time_t Timer::us_to_ticks(time_t const us) const {
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return (us / 1000) * Driver::TICS_PER_MS; }
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time_t Timer::_max_value() const {
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return (addr_t)~0; }
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time_t Timer::_value()
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{
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addr_t time = _driver.stime();
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return time < _driver.timeout ? _driver.timeout - time : 0;
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}
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unsigned Timer::interrupt_id() const {
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return 1; }
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