mirror of
https://github.com/Tom-on64/kern.git
synced 2026-11-03 18:22:22 +00:00
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
#include <interrupt/pit.h>
|
|
#include <interrupt/idt.h>
|
|
#include <interrupt/pic.h>
|
|
#include <tty/tty.h>
|
|
#include <memory/addresses.h>
|
|
#include <ports/io.h>
|
|
#include <stdint.h>
|
|
|
|
__attribute__ ((interrupt))
|
|
void timerHandler(intFrame_t* iframe) {
|
|
static uint32_t cursorTicks = 0;
|
|
cursorTicks++;
|
|
|
|
if (!terminal->hideCursor) { // TODO: Make a better cursor drawing thing
|
|
if (cursorTicks % 500 == 0) toggleCursor();
|
|
}
|
|
|
|
if (*(uint32_t*)SLEEP_TIMER > 0) { --(*(uint32_t*)SLEEP_TIMER); }
|
|
|
|
sendPicEOI(0);
|
|
}
|
|
|
|
void setPitPhase(uint8_t channel, uint8_t opMode, uint16_t hz) {
|
|
if (channel > 2 || opMode > 7) { return; }
|
|
__asm__ volatile ("cli");
|
|
|
|
// Send command - bits 7-6 channel, 5-4 Access mode, 3-1 operating mode, 0 - Should be zero in x86
|
|
outb(COMMAND, ((channel << 6) | (3 << 4) | (opMode << 1)));
|
|
|
|
// Send frequency
|
|
uint16_t freq = INPUT_CLK / hz; // I solved an equation to figure this out
|
|
outb(CHANNEL_0 + channel, (uint8_t)freq);
|
|
outb(CHANNEL_0 + channel, (uint8_t)(freq >> 8));
|
|
|
|
__asm__ volatile ("sti");
|
|
}
|
|
|
|
void setupTimer() { // Sets up IRQ 0 - PIT
|
|
idtSetGate(0x20, timerHandler, INT_GATE_FLAGS);
|
|
unsetIrqMask(0);
|
|
setPitPhase(0, 2, 1000); // Default setup: 1000Hz - 1 tick per 1ms
|
|
}
|
|
|