107 lines
2.2 KiB
C++
107 lines
2.2 KiB
C++
#include <go32.h>
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#include "../Timer.h"
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#include "../Pic.h"
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#include "../../util/Asm.h"
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#include "../../util/Log.h"
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#define PIT_FREQ 1193181
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#define PIT_MODE_CH0 0x00
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#define PIT_MODE_CH1 0x40
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#define PIT_MODE_CH2 0x80
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#define PIT_MODE_ACCESS_LO 0x10
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#define PIT_MODE_ACCESS_HI 0x20
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#define PIT_MODE_ACCESS_LOHI 0x30
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#define PIT_MODE_M0 0x00
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#define PIT_MODE_M1 0x02
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#define PIT_MODE_M2 0x04
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#define PIT_MODE_M3 0x06
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#define PIT_MODE_M4 0x08
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#define PIT_MODE_M5 0x0a
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#define PIT_MODE_BIN 0x00
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#define PIT_MODE_BCD 0x01
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#define PIT_REG_CH0 0x40
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#define PIT_REG_CH1 0x41
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#define PIT_REG_CH2 0x42
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#define PIT_REG_MODE 0x43
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void timerISR() {
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Timer::instance().update();
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}
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Timer::Timer() {
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_go32_dpmi_get_protected_mode_interrupt_vector(8, &_oldIsr);
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_newIsr.pm_offset = reinterpret_cast<int>(timerISR);
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_newIsr.pm_selector = _go32_my_cs();
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_go32_dpmi_allocate_iret_wrapper(&_newIsr);
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_go32_dpmi_set_protected_mode_interrupt_vector(8, &_newIsr);
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}
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Timer::~Timer() {
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setDivider(65535);
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_go32_dpmi_set_protected_mode_interrupt_vector(8, &_oldIsr);
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_go32_dpmi_free_iret_wrapper(&_newIsr);
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}
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void Timer::update() {
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_ticks++;
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if (_callback) {
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DefaultLog.log("Timer tick with callback\n");
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_callback();
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} else {
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DefaultLog.log("Timer tick without callback\n");
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}
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_elapsed += _div;
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if (_elapsed >= 65535) {
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_elapsed -= 65535;
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// TODO call old isr
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// Documentation is kind of nonexistant so we will not call the handler for now
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Pic::clearInterrupt();
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} else {
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Pic::clearInterrupt();
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}
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}
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uint32_t Timer::getTicks() const {
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return _ticks;
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}
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uint16_t Timer::getFrequency() const {
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return _freq;
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}
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Timer &Timer::instance() {
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static Timer inst;
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return inst;
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}
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void Timer::setFrequency(uint16_t freq) {
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_freq = freq;
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setDivider(PIT_FREQ / freq);
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}
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void Timer::setDivider(uint16_t div) {
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auto wasEnabled = interruptsEnabled();
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disableInterrupts();
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_div = div;
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// Update PIT frequency
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outb(PIT_REG_MODE, PIT_MODE_CH0|PIT_MODE_ACCESS_LOHI|PIT_MODE_M2|PIT_MODE_BIN);
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outb(PIT_REG_CH0, _div & 0xff);
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outb(PIT_REG_CH0, (_div >> 8) & 0xff);
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if (wasEnabled) enableInterrupts();
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}
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Timer::Callback Timer::setCallback(Timer::Callback callback) {
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auto oldCallback = _callback;
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_callback = callback;
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return oldCallback;
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}
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