Archipelago » qemu

/*

 * QEMU 8253/8254 interval timer emulation

 * Copyright (c) 2003-2004 Fabrice Bellard

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

}

/* return -1 if no transition will occur.  */

                                            int64_t current_time)

{

    uint64_t d, next_time, base;

    case 3:

        base = (d / s->count) * s->count;

        period2 = ((s->count + 1) >> 1);

            next_time = base + period2;

        else

            next_time = base + s->count;

    PITState *pit = opaque;

    int ret, count;

    PITChannelState *s;

    addr &= 3;

    s = &pit->channels[addr];

    if (s->status_latched) {

    qemu_set_irq(s->irq, irq_level);

#ifdef DEBUG_PIT

    printf("irq_level=%d next_delay=%f\n",

           (double)(expire_time - current_time) / ticks_per_sec);

#endif

    s->next_transition_time = expire_time;

    PITState *pit = opaque;

    PITChannelState *s;

    int i;

    for(i = 0; i < 3; i++) {

        s = &pit->channels[i];

        qemu_put_be32s(f, &s->count);

    PITState *pit = opaque;

    PITChannelState *s;

    int i;

    if (version_id != 1)

        return -EINVAL;