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/* Project:     OSLib

 * Description: The OS Construction Kit

 * Date:                1.6.2000

 * Idea by:             Luca Abeni & Gerardo Lamastra

 *

 * OSLib is an SO project aimed at developing a common, easy-to-use

 * low-level infrastructure for developing OS kernels and Embedded

 * Applications; it partially derives from the HARTIK project but it

 * currently is independently developed.

 *

 * OSLib is distributed under GPL License, and some of its code has

 * been derived from the Linux kernel source; also some important

 * ideas come from studying the DJGPP go32 extender.

 *

 * We acknowledge the Linux Community, Free Software Foundation,

 * D.J. Delorie and all the other developers who believe in the

 * freedom of software and ideas.

 *

 * For legalese, check out the included GPL license.

 */

/* Added Advanced Timer Code

 *

 * Date:   8.4.2003

 * Author: Giacomo Guidi <giacomo@gandalf.sssup.it>

 *

 */

/*	Time Event routines	(one shot mode)	*/

#include <ll/i386/stdlib.h>

#include <ll/i386/mem.h>

#include <ll/i386/pit.h>

#include <ll/i386/apic.h>

#include <ll/i386/advtimer.h>

#include <ll/i386/error.h>

#include <ll/i386/64bit.h>

#include <ll/sys/ll/ll-data.h>

#include <ll/sys/ll/ll-func.h>

#include <ll/sys/ll/time.h>

#include <ll/sys/ll/event.h>

#include <tracer.h>

extern unsigned short int currCtx;

FILE(EventOneShot);

extern int activeInt;

int activeEvent;

extern BYTE frc;

extern struct event eventlist[MAX_EVENT];

extern WORD lastTime;

extern struct pitspec globalCounter;

extern struct event *freeevents;

extern struct event *firstevent;

extern void (*evt_prol) (void);

extern void (*evt_epil) (void);

extern unsigned int apic_clk_per_msec;

/* Switched to timespec */

int oneshot_event_post(struct timespec time, void (*handler) (void *p),

		       void *par)

{

    struct event *p;

    struct event *p1, *t;

    struct timespec now, tmp;

    int done;

    DWORD tnext;

    TRACER_LOGEVENT(FTrace_EVT_timer_post, 0, 0, 0);

    if (!freeevents) {

        message("NO FREE EVENTS !\n");

        ll_abort(20);

	return -1;

    }

    /* Extract from the ``free events'' queue */

    p = freeevents;

    freeevents = p->next;

    /* Fill the event fields */

    p->handler = handler;

    TIMESPEC_ASSIGN(&(p->time), &time);

    p->par = par;

    /* ...And insert it in the event queue!!! */

    t = NULL;

    done = 0;

    /* walk through list, finding spot, adjusting ticks parameter */

    for (p1 = firstevent; p1; p1 = t->next) {

	if (TIMESPEC_A_GT_B((&time), (&p1->time))) {

	    t = p1;

	} else

	    break;

    }

    /* adjust next entry */

    if (t) {

	t->next = p;

    } else {

	firstevent = p;

	if (!activeEvent) {

          #ifndef __TSC__

             ll_gettime(TIME_NEW, &now);

          #else

             ll_read_timespec(&now);

          #endif

	  if (TIMESPEC_A_GT_B(&now, &(firstevent->time))) {

	    NULL_TIMESPEC(&tmp);

	  } else {

	    SUBTIMESPEC(&(firstevent->time), &now, &tmp);

	  }

	  tnext = TIMESPEC2USEC(&tmp);

	  #ifndef __APIC__

            mul32div32to32(tnext,1193182,1000000,tnext);

            pit_setconstant(0, tnext);

          #else

            mul32div32to32(tnext,apic_clk_per_msec,1000,tnext);

            set_APIC_timer(tnext);

          #endif

	}

    }

    p->next = p1;

    return p->index;

}

void oneshot_wake_up(void)

{				/* CHANGE the NAME, please... */

    struct event *p = NULL, *pp;

    struct timespec now, ttmp;

    #ifndef __TSC__

      WORD tmp;

    #endif

    DWORD tnext;

    TRACER_LOGEVENT(FTrace_EVT_timer_wakeup_start, 0, 0, 0);

    #ifndef __TSC__

	tmp = pit_read(frc);

	ADDPITSPEC((WORD) (lastTime - tmp), &globalCounter);

	lastTime = tmp;

	PITSPEC2TIMESPEC(&globalCounter, &now);

    #else

	ll_read_timespec(&now);

    #endif

    if (firstevent != NULL) {

        activeEvent = 1;

	if (TIMESPEC_A_GT_B(&now, &(firstevent->time))) {

	    if (!activeInt && evt_prol != NULL) {

		evt_prol();

	    }

	    activeInt++;

	    for (p = firstevent; p != NULL; p = pp) {

		if ((p->time.tv_sec > now.tv_sec) ||

		    ((p->time.tv_sec == now.tv_sec)

		     && (p->time.tv_nsec > now.tv_nsec))) {

		    break;

		}

		pp = p->next;

		p->next = freeevents;

		freeevents = p;

		firstevent = pp;

		p->handler(p->par);

	    }

	    if (activeInt == 1 && evt_epil != NULL) {

		evt_epil();

	    }

	    activeInt--;

	}

	#ifndef __TSC__

	    tmp = pit_read(frc);

	    ADDPITSPEC((WORD) (lastTime - tmp), &globalCounter);

	    lastTime = tmp;

	    PITSPEC2TIMESPEC(&globalCounter, &now);

	#else

	    ll_read_timespec(&now);

	#endif

	if (TIMESPEC_A_GT_B(&now, &(firstevent->time))) {

	    NULL_TIMESPEC(&ttmp);

	} else {

	    SUBTIMESPEC(&(firstevent->time), &now, &ttmp);

	}

	/*  SUBTIMESPEC(&(firstevent->time), &now, &ttmp); */

	tnext = TIMESPEC2USEC(&ttmp);

	#ifndef __APIC__

          mul32div32to32(tnext,1193182,1000000,tnext);

	  pit_setconstant(0, tnext);

        #else

          mul32div32to32(tnext,apic_clk_per_msec,1000,tnext);

          set_APIC_timer(tnext);

        #endif

	activeEvent = 0;

    } else {

        #ifndef __APIC__

	  pit_setconstant(0, 0xFFFF);

        #else

          set_APIC_timer(0xFFFFFFFF);

        #endif

    }

    TRACER_LOGEVENT(FTrace_EVT_timer_wakeup_end, 1, (int)currCtx, 0);

}

int oneshot_event_delete(int index)

{

    struct event *p1, *t;

    struct timespec tmp, now;

    DWORD tnext;

    int firstdeleted = FALSE;

    TRACER_LOGEVENT(FTrace_EVT_timer_delete, 0, 0, 0);

    if (index == -1)

	return -1;

    t = NULL;

    /* walk through list, finding spot, adjusting ticks parameter */

    for (p1 = firstevent; (p1) && (index != p1->index); p1 = t->next) {

	t = p1;

    }

    if (p1 == NULL) {

	return -1;

    }

    if (t == NULL) {

	firstevent = p1->next;

	firstdeleted = TRUE;

    } else {

	t->next = p1->next;

    }

    p1->next = freeevents;

    freeevents = p1;

    if (!activeEvent) {

      if (firstevent == NULL) {

        #ifndef __APIC__

	  pit_setconstant(0, 0xFFFF);

        #else

          set_APIC_timer(0xFFFFFFFF);

        #endif

      } else {

	if (firstdeleted) {

          #ifndef __TSC__

             ll_gettime(TIME_NEW, &now);

          #else

             ll_read_timespec(&now);

          #endif

	  if (TIMESPEC_A_GT_B(&now, &(firstevent->time))) {

	    NULL_TIMESPEC(&tmp);

	  } else {

	    SUBTIMESPEC(&(firstevent->time), &now, &tmp);

	  }

	  /*SUBTIMESPEC(&now, &(firstevent->time), &tmp); */

	  tnext = TIMESPEC2USEC(&tmp);

	  #ifndef __APIC__

            mul32div32to32(tnext,1193182,1000000,tnext);

	    pit_setconstant(0, tnext);

          #else

            mul32div32to32(tnext,apic_clk_per_msec,1000,tnext);

            set_APIC_timer(tnext);

          #endif

	}

      }

    }

    return 1;

}