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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/sys/ll/ll-data.h>

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

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

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 char use_tsc;

/* TODO: oneshot_event_delete & oneshot_event_init... */

/* 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;

    if (!freeevents) {

        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) {

          ll_gettime(TIME_NEW, &now);

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

            NULL_TIMESPEC(&tmp);

          } else {

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

          }

          tnext = TIMESPEC2USEC(&tmp);

          tnext = (tnext * 1197) / 1000;

          pit_setconstant(0, tnext);

        }

    }

    p->next = p1;

    return p->index;

}

void oneshot_wake_up(void)

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

    struct event *p = NULL, *pp;

    struct timespec now, ttmp;

    WORD tmp;

    DWORD tnext;

    if (!use_tsc) {

        tmp = pit_read(frc);

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

        lastTime = tmp;

        PITSPEC2TIMESPEC(&globalCounter, &now);

    } else {

        read_timespec(&now);

    }

    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--;

        }

        if (!use_tsc) {

            tmp = pit_read(frc);

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

            lastTime = tmp;

            PITSPEC2TIMESPEC(&globalCounter, &now);

        } else {

            read_timespec(&now);

        }

        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);

        tnext = (tnext * 1197) / 1000;

        pit_setconstant(0, tnext);

        activeEvent = 0;

    } else {

        pit_setconstant(0, 0xFFFF);

    }

}

int oneshot_event_delete(int index)

{

    struct event *p1, *t;

    struct timespec tmp, now;

    DWORD tnext;

    int firstdeleted = FALSE;

    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) {

        pit_setconstant(0, 0xFFFF);

      } else {

        if (firstdeleted) {

          ll_gettime(TIME_NEW, &now);

          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);

          tnext = (tnext * 1197) / 1000;

          pit_setconstant(0, tnext);

        }

      }

    }

    return 1;

}