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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#ifndef KMI_ARCH_TIMER_H
#define KMI_ARCH_TIMER_H
/**
* @file timer.h
* Arch-specific timer handling, generally implemented in
* arch/whatever/timer.c
*/
#include <kmi/timer.h>
#if defined(__riscv)
# if __riscv_xlen == 64
#include "../../arch/riscv64/include/timer.h"
# else
#include "../../arch/riscv32/include/timer.h"
# endif
#endif
/**
* Get hardware timer frequency.
*
* @param fdt Global FDT pointer.
* @return Hardware timer frequency, ticks/sec.
*/
ticks_t stat_timer(const void *fdt);
/**
* Set up timer interrupt for absolute ticks.
* At least currently assumes there is only one global timer, the kernel will
* ensure that the timer is scheduled to handle events in order.
*
* When setting a new timer, the current timer (if one is set) will
* not trigger an interrupt. For instance, if called from the interrupt handler
* of the existing interrupt, it won't re-trigger.
*
* @param ticks Time point for timer to trigger.
* \todo Should maybe be stat_t?
*/
void set_timer(ticks_t ticks);
/**
* Stop the timer interrupts from happening altogether. Mainly called during
* init to avoid spurious interrupts and when all userspace timers have been
* handled.
*/
void clear_timer();
/**
* Get current ticks.
*
* @return Current tick count.
*/
ticks_t current_ticks();
#endif /* KMI_ARCH_TIMER_H */
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