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refactor(kernel): ♻️ rewrite time manager

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EnderIce2
2025-05-23 23:30:04 +00:00
parent 9538589c11
commit 33c284091d
31 changed files with 572 additions and 573 deletions
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100
Kernel/subsystem/time/hpet.cpp Normal file
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/*
This file is part of Fennix Kernel.
Fennix Kernel is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
Fennix Kernel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
#include <time.hpp>
#include <memory.hpp>
#include <acpi.hpp>
#include <debug.h>
#include <io.h>
#include "../../kernel.h"
namespace Time
{
bool HighPrecisionEventTimer::Sleep(size_t Nanoseconds)
{
uint64_t target = this->GetNanoseconds() + Nanoseconds;
while (this->GetNanoseconds() < target)
CPU::Pause();
return true;
}
uint64_t HighPrecisionEventTimer::GetNanoseconds()
{
#if defined(__amd64__)
uint64_t counter = mminq(&this->hpet->MainCounter);
#elif defined(__i386__)
uint64_t counter = mminl(&this->hpet->MainCounter);
#else
return 0;
#endif
/* convert ticks to nanoseconds: counter * period_fs / 1e6 */
return (counter * 1'000'000'000ULL) / this->Period;
}
HighPrecisionEventTimer::HighPrecisionEventTimer(void *hpet)
{
#if defined(__amd64__) || defined(__i386__)
ACPI::ACPI::HPETHeader *hdr = (ACPI::ACPI::HPETHeader *)hpet;
Memory::Virtual vmm;
vmm.Map((void *)hdr->Address.Address, (void *)hdr->Address.Address, Memory::RW | Memory::PCD | Memory::PWT);
this->hpet = reinterpret_cast<HPET *>(hdr->Address.Address);
debug("%s timer is at address %#lx", hdr->Header.OEMID, hdr->Address.Address);
uint64_t period_fs = this->hpet->CapabilitiesID >> 32;
if (period_fs == 0)
{
warn("HPET: Invalid period in CapabilitiesID");
return;
}
/* Hz = 1e15 / period_fs */
this->Period = 1'000'000'000'000'000ULL / period_fs;
KPrint("HPET tick period: %lu femtoseconds -> %u Hz", period_fs, this->Period);
#ifdef __amd64__
mmoutq(&this->hpet->Configuration, 0);
mmoutq(&this->hpet->MainCounter, 0);
mmoutq(&this->hpet->Configuration, 1);
#else
mmoutl(&this->hpet->Configuration, 0);
mmoutl(&this->hpet->MainCounter, 0);
mmoutl(&this->hpet->Configuration, 1);
#endif
for (int i = 0; i < 5; i++)
{
uint64_t val = mminq(&this->hpet->MainCounter);
KPrint("HPET counter test %d: %llu", i, val);
}
uint64_t cfg = mminq(&this->hpet->Configuration);
if (!(cfg & 1))
warn("HPET counter is not enabled!");
ClassCreationTime = this->GetNanoseconds();
#endif
}
HighPrecisionEventTimer::~HighPrecisionEventTimer()
{
#ifdef __amd64__
mmoutq(&this->hpet->Configuration, 0);
#else
mmoutl(&this->hpet->Configuration, 0);
#endif
}
}