I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
146 lines
4.5 KiB
C++
146 lines
4.5 KiB
C++
/*
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* Copyright (c) 2011, 2012, 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x86-family/time.cpp
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* Retrieving the current time.
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*/
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#include <sys/types.h>
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#include <timespec.h>
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#include <sortix/timespec.h>
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#include <sortix/kernel/clock.h>
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#include <sortix/kernel/cpu.h>
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#include <sortix/kernel/interrupt.h>
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#include <sortix/kernel/ioport.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/process.h>
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#include <sortix/kernel/scheduler.h>
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#include <sortix/kernel/thread.h>
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#include <sortix/kernel/time.h>
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namespace Sortix {
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namespace Time {
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static uint16_t DivisorOfFrequency(long frequency)
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{
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// The value we send to the PIT is the value to divide it's input clock
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// (1193180 Hz) by, to get our required frequency. Note that the divisor
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// must be small enough to fit into 16 bits.
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return 1193180 / frequency;
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}
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static long FrequencyOfDivisor(uint16_t divisor)
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{
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return 1193180 / divisor;
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}
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static long RealFrequencyOfFrequency(long frequency)
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{
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return FrequencyOfDivisor(DivisorOfFrequency(frequency));
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}
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static struct timespec PeriodOfFrequency(long frequency)
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{
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long period_ns = 1000000000L / frequency;
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return timespec_make(0, period_ns);
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}
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static void RequestIRQ0(uint16_t divisor)
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{
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outport8(0x43, 0x36);
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outport8(0x40, divisor >> 0 & 0xFF);
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outport8(0x40, divisor >> 8 & 0xFF);
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}
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extern Clock* realtime_clock;
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extern Clock* uptime_clock;
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struct interrupt_handler timer_interrupt_registration;
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static struct timespec tick_period;
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static long tick_frequency;
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static uint16_t tick_divisor;
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static void OnIRQ0(struct interrupt_context* intctx, void* /*user*/)
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{
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OnTick(tick_period, !InUserspace(intctx));
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Scheduler::Switch(intctx);
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// TODO: There is a horrible bug that causes Sortix to only receive
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// one IRQ0 on my laptop, but it works in virtual machines. But
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// re-requesting an addtional time seems to work. Hacky and ugly.
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// TODO: Confirm whether this still happens and whether it is trigged by
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// another bug in my system.
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static bool did_ugly_irq0_hack = false;
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if ( !did_ugly_irq0_hack )
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RequestIRQ0(tick_divisor),
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did_ugly_irq0_hack = true;
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}
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void CPUInit()
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{
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// Estimate the rate that interrupts will be coming at.
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long desired_frequency = 100/*Hz*/;
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tick_frequency = RealFrequencyOfFrequency(desired_frequency);
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tick_divisor = DivisorOfFrequency(tick_frequency);
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tick_period = PeriodOfFrequency(tick_frequency);
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// Initialize the clocks on this system.
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realtime_clock->SetCallableFromInterrupts(true);
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uptime_clock->SetCallableFromInterrupts(true);
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struct timespec nul_time = timespec_nul();
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realtime_clock->Set(&nul_time, &tick_period);
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uptime_clock->Set(&nul_time, &tick_period);
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}
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void InitializeProcessClocks(Process* process)
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{
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struct timespec nul_time = timespec_nul();
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process->execute_clock.SetCallableFromInterrupts(true);
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process->execute_clock.Set(&nul_time, &tick_period);
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process->system_clock.SetCallableFromInterrupts(true);
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process->system_clock.Set(&nul_time, &tick_period);
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process->child_execute_clock.Set(&nul_time, &tick_period);
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process->child_execute_clock.SetCallableFromInterrupts(true);
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process->child_system_clock.Set(&nul_time, &tick_period);
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process->child_system_clock.SetCallableFromInterrupts(true);
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}
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void InitializeThreadClocks(Thread* thread)
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{
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struct timespec nul_time = timespec_nul();
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thread->execute_clock.SetCallableFromInterrupts(true);
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thread->execute_clock.Set(&nul_time, &tick_period);
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thread->system_clock.SetCallableFromInterrupts(true);
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thread->system_clock.Set(&nul_time, &tick_period);
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}
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void Start()
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{
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// Handle timer interrupts if they arrive.
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timer_interrupt_registration.handler = OnIRQ0;
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timer_interrupt_registration.context = 0;
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Interrupt::RegisterHandler(Interrupt::IRQ0, &timer_interrupt_registration);
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// Request a timer interrupt now that we can handle them safely.
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RequestIRQ0(tick_divisor);
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}
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} // namespace Time
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} // namespace Sortix
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