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#include <arch/drivers/tick.h>
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#include <arch/drivers/tick.h>
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#include <arch/interrupt.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <arch/register.h>
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#include <arch/register.h>
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#include <debug.h>
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#include <time/clock.h>
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#include <typedefs.h>
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#include <typedefs.h>
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#include <arch/cpu.h>
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#include <arch/boot/boot.h>
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#include <time/clock.h>
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#include <arch.h>
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#include <debug.h>
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#define TICK_RESTART_TIME   50  /* Worst case estimate. */
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/** Initialize tick interrupt. */
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/** Initialize tick interrupt. */
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void tick_init(void)
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void tick_init(void)
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{
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{
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    tick_compare_reg_t compare;
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    tick_compare_reg_t compare;
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    interrupt_register(14, "tick_int", tick_interrupt);
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    interrupt_register(14, "tick_int", tick_interrupt);
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    compare.int_dis = false;
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    compare.int_dis = false;
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    compare.tick_cmpr = TICK_DELTA;
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    compare.tick_cmpr = bootinfo.processor.clock_frequency/HZ;
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    tick_compare_write(compare.value);
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    tick_compare_write(compare.value);
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    tick_write(0);
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    tick_write(0);
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}
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}
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/** Process tick interrupt.
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/** Process tick interrupt.
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 * @param istate Interrupted state.
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 * @param istate Interrupted state.
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 */
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 */
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void tick_interrupt(int n, istate_t *istate)
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void tick_interrupt(int n, istate_t *istate)
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{
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{
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    softint_reg_t softint, clear;
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    softint_reg_t softint, clear;
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    uint64_t next, compare, start, stop;
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    softint.value = softint_read();
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    softint.value = softint_read();
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    /*
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    /*
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     * Make sure we are servicing interrupt_level_14
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     * Make sure we are servicing interrupt_level_14
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    clear_softint_write(clear.value);
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    clear_softint_write(clear.value);
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    /*
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    /*
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     * Restart counter.
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     * Restart counter.
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     */
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     */
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    compare = CPU->arch.clock_frequency/HZ;
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    start = tick_read();
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    next = start - compare;
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    while (next >= compare - TICK_RESTART_TIME) {
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        next -= compare;
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        CPU->missed_clock_ticks++;
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    }
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    tick_write(0);
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    stop = tick_read();
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    tick_write(next + (stop - start));
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    clock();
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    clock();
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}
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}
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/** @}
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/** @}