96 lines
1.7 KiB
C
96 lines
1.7 KiB
C
#include <timer.h>
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#include <logger.h>
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#include <utils.h>
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#include <kmalloc.h>
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#define CORE0_TIMER_IRQ_CTRL ((volatile uint32_t *)0x40000040)
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timer_t *global_timer = (timer_t *)0x0;
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MMIO_W_HELPER(_enable_timer_irq, CORE0_TIMER_IRQ_CTRL, 0x1, 1);
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static inline
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uint32_t _d(timer_t *t)
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{ return t ? t->_d : 0; }
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static inline
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void _swap(timer_t *a, timer_t *b)
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{
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timer_t *tmp = a;
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a = b, b = tmp;
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}
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static inline
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timer_t *_merge(timer_t *a, timer_t *b)
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{
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if (!a || !b)
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return a ?: b;
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if (a->data.firing_tick > b->data.firing_tick)
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_swap(a, b);
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a->_r = _merge(a->_r, b);
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if (_d(a->_l) < _d(a->_r))
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_swap(a->_l, a->_r);
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a->_d = _d(a->_r) + 1;
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return a;
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}
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static inline
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timer_t *_pop(timer_t *t)
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{
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if (!t || (!t->_l && !t->_r))
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return (timer_t *)0x0;
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return _merge(t->_l, t->_r);
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}
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static inline
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void _set_timer_interrrupt()
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{
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if (global_timer) {
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uint64_t cntpct_el0;
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R_SYSREG(cntpct_el0, cntpct_el0);
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DEBUG_EXCEP(cntpct_el0);
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uint64_t firing_tick = MAX(global_timer->data.firing_tick, cntpct_el0);
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W_SYSREG(cntp_cval_el0, firing_tick);
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_enable_timer_irq(true);
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}
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}
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void add_task(task_t task)
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{
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DEBUG_EXCEP("add task");
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timer_t *newtimer = kmalloc(sizeof(timer_t));
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*newtimer = (timer_t){
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._l = (timer_t *)0x0,
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._r = (timer_t *)0x0,
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._d = 0,
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.data = task,
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};
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global_timer = _merge(global_timer, newtimer);
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_set_timer_interrrupt();
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}
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void timer_irq_handler(void)
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{
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_enable_timer_irq(false);
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LOG("timer irq");
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uint64_t cntpct_el0;
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R_SYSREG(cntpct_el0, cntpct_el0);
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DEBUG_EXCEP(cntpct_el0);
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if (global_timer) {
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global_timer->data.func(global_timer->data.param);
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global_timer = _pop(global_timer);
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}
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_set_timer_interrrupt();
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}
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