Karina
36 lines
912 B
C
36 lines
912 B
C
// SPDX-License-Identifier: GPL-3.0-or-later
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// Copyright (c) 2026 0xKarinyash
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#include <IO/IOTimer.h>
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#include <IO.h>
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#include <types.h>
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#include <OS/OSScheduler.h>
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enum {
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kIOTimerPitBaseClock = 1193180,
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kIOTimerPitCommand = 0x43,
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kIOTimerPitData = 0x40,
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};
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static volatile UInt64 sIOTimerTicks = 0;
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void IOTimerInitialize(UInt32 frequency) {
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UInt32 divisor = kIOTimerPitBaseClock / frequency;
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IOPortWrite8(kIOTimerPitCommand, 0x36); // 0x36 = 00110110 = channel 0, LOHI byte access, Mode 3, binary
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IOPortWrite8(kIOTimerPitData, divisor & 0xFF);
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IOPortWrite8(kIOTimerPitData, (divisor >> 8) & 0xFF);
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UInt8 mask = IOPortRead8(0x21);
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mask &= ~(1 << 0);
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IOPortWrite8(0x21, mask);
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}
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UInt64 IOTimerInterruptsHandler(CPURegisters *registers) {
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sIOTimerTicks++;
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return OSSchedulerNext((UInt64)registers);
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}
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UInt64 IOTimerGetTicks() {
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return sIOTimerTicks;
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} |