108 lines
2.0 KiB
C++
108 lines
2.0 KiB
C++
/*
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* \brief Timer driver for core
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* \author Reto Buerki
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* \date 2015-04-14
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*/
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/*
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* Copyright (C) 2015 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 General Public License version 2.
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*/
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#ifndef _CORE__INCLUDE__SPEC__X86_64__MUEN__TIMER_H_
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#define _CORE__INCLUDE__SPEC__X86_64__MUEN__TIMER_H_
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#include <base/printf.h>
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/* core includes */
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#include <board.h>
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#include <sinfo.h>
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namespace Genode
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{
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/**
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* Timer driver for core on Muen
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*/
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class Timer;
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}
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class Genode::Timer
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{
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private:
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enum {
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TIMER_DISABLED = ~0ULL,
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};
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uint64_t _tics_per_ms;
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struct Subject_timer
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{
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uint64_t value;
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uint8_t vector;
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} __attribute__((packed));
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struct Subject_timer * _timer_page;
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inline uint64_t rdtsc()
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{
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uint32_t lo, hi;
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asm volatile("rdtsc" : "=a" (lo), "=d" (hi));
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return (uint64_t)hi << 32 | lo;
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}
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class Invalid_region {};
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public:
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Timer() : _tics_per_ms(Sinfo::get_tsc_khz())
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{
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struct Sinfo::Memregion_info region;
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if (!Sinfo::get_memregion_info("timer", ®ion)) {
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PERR("muen-timer: Unable to retrieve time memory region");
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throw Invalid_region();
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}
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_timer_page = (Subject_timer *)region.address;
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_timer_page->vector = Board::TIMER_VECTOR_KERNEL;
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PINF("muen-timer: page @0x%llx, frequency %llu kHz, vector %u",
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region.address, _tics_per_ms, _timer_page->vector);
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}
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static unsigned interrupt_id(int)
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{
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return Board::TIMER_VECTOR_KERNEL;
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}
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inline void start_one_shot(uint32_t const tics, unsigned)
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{
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_timer_page->value = rdtsc() + tics;
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}
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uint32_t ms_to_tics(unsigned const ms)
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{
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return ms * _tics_per_ms;
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}
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unsigned value(unsigned)
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{
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const uint64_t now = rdtsc();
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if (_timer_page->value != TIMER_DISABLED
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&& _timer_page->value > now) {
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return _timer_page->value - now;
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}
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return 0;
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}
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/*
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* Dummies
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*/
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static void disable_pit(void) { }
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};
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namespace Kernel { class Timer : public Genode::Timer { }; }
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#endif /* _CORE__INCLUDE__SPEC__X86_64__MUEN__TIMER_H_ */
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