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#include <cpu.h>
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#include <cpu.h>
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#include <arch.h>
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#include <arch.h>
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#include <adt/list.h>
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#include <adt/list.h>
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#include <atomic.h>
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#include <atomic.h>
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#include <proc/thread.h>
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#include <proc/thread.h>
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#include <sysinfo/sysinfo.h>
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#include <arch/barrier.h>
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/* Pointers to public variables with time */
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struct ptime {
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    __native seconds;
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    __native useconds;
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    __native useconds2;
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};
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struct ptime *public_time;
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/* Variable holding fragment of second, so that we would update
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 * seconds correctly
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 */
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static __native secfrag = 0;
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/** Initialize realtime clock counter
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 *
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 * The applications (and sometimes kernel) need to access accurate
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 * information about realtime data. We allocate 1 page with these
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 * data and update it periodically.
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 *
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 *
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 */
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void clock_counter_init(void)
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{
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    void *faddr;
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    faddr = (void *)PFN2ADDR(frame_alloc(0, FRAME_ATOMIC));
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    if (!faddr)
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        panic("Cannot allocate page for clock");
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    public_time = (struct ptime *)PA2KA(faddr);
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        /* TODO: We would need some arch dependent settings here */
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    public_time->seconds = 0;
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    public_time->useconds = 0;
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    sysinfo_set_item_val("clock.faddr", NULL, (__native)faddr);
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}
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/** Update public counters
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 *
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 * Update it only on first processor
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 * TODO: Do we really need so many write barriers?
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 */
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static void clock_update_counters(void)
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{
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    if (CPU->id == 0) {
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        secfrag += 1000000/HZ;
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        if (secfrag >= 1000000) {
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            public_time->useconds = 0;
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            write_barrier();
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            public_time->seconds++;
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            secfrag = 0;
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        } else
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            public_time->useconds += 1000000/HZ;
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        write_barrier();
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        public_time->useconds2 = public_time->useconds;
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        write_barrier();
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    }
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}
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/** Clock routine
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/** Clock routine
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 *
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 *
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 * Clock routine executed from clock interrupt handler
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 * Clock routine executed from clock interrupt handler
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 * (assuming interrupts_disable()'d). Runs expired timeouts
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 * (assuming interrupts_disable()'d). Runs expired timeouts
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    /*
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    /*
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     * To avoid lock ordering problems,
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     * To avoid lock ordering problems,
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     * run all expired timeouts as you visit them.
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     * run all expired timeouts as you visit them.
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     */
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     */
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    for (i = 0; i <= CPU->missed_clock_ticks; i++) {
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    for (i = 0; i <= CPU->missed_clock_ticks; i++) {
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        clock_update_counters();
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        spinlock_lock(&CPU->timeoutlock);
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        spinlock_lock(&CPU->timeoutlock);
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        while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) {
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        while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) {
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            h = list_get_instance(l, timeout_t, link);
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            h = list_get_instance(l, timeout_t, link);
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            spinlock_lock(&h->lock);
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            spinlock_lock(&h->lock);
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            if (h->ticks-- != 0) {
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            if (h->ticks-- != 0) {