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#include <arch.h>
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#include <arch.h>
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#include <debug.h>
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#include <debug.h>
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#define TICK_RESTART_TIME   50  /* Worst case estimate. */
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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 and stick 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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    /* initialize TICK interrupt */
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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 = CPU->arch.clock_frequency / HZ;
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    compare.tick_cmpr = CPU->arch.clock_frequency / HZ;
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    CPU->arch.next_tick_cmpr = compare.tick_cmpr;
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    CPU->arch.next_tick_cmpr = compare.tick_cmpr;
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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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#if defined (US3)
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    /* disable STICK interrupts and clear any pending ones */
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    tick_compare_reg_t stick_compare;
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    softint_reg_t clear;
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    stick_compare.value = stick_compare_read();
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    stick_compare.int_dis = true;
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    stick_compare.tick_cmpr = 0;
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    stick_compare_write(stick_compare.value);
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    clear.value = 0;
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    clear.stick_int = 1;
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    clear_softint_write(clear.value);
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#endif
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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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 *
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 *
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 * @param n Interrupt Level, 14,  (can be ignored)
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 * @param n Interrupt Level, 14,  (can be ignored)
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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 drift;
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    uint64_t drift;
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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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     */
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     */