44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/**
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* PIT section of rockOS
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* Copyright (C) 2022 Furkan Mudanyali
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, _either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <rockos/timer.h>
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#include <rockos/hal.h>
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#include <rockos/pic.h>
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#include <stdio.h>
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uint64_t ticks = 0;
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uint8_t subticks = 0;
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__attribute__((interrupt)) void timer_handler(__attribute__((unused)) void* frame) {
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if(++subticks == SUBTICKS_PER_TICK) {
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++ticks;
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subticks = 0;
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}
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pic_eoi(0);
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}
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void timer_phase(uint32_t hz) {
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uint32_t divisor = PIT_SCALE / hz;
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outb(PIT_CONTROL, PIT_SET);
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outb(PIT_0, divisor & PIT_MASK);
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outb(PIT_0, (divisor >> 8) & PIT_MASK);
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}
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uint64_t get_ticks() {
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return ticks*100 + subticks;
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} |