Archipelago » qemu

 * The 31-bit counter is incremented every 500ns by bit 9. Bits 8..0

 * are zero. Bit 31 is 1 when count has been reached.

 *

 */

typedef struct SLAVIO_TIMERState {

    int irq;

    int reached, stopped;

    int mode; // 0 = processor, 1 = user, 2 = system

} SLAVIO_TIMERState;

#define TIMER_MAXADDR 0x1f

#define CNT_FREQ 2000000

// Update count, set irq, update expire_time

static void slavio_timer_get_out(SLAVIO_TIMERState *s)

    else

	ticks = qemu_get_clock(vm_clock) - s->tick_offset;

    if (out)

	s->reached = 0x80000000;

    if (!s->limit)

    DPRINTF("irq %d limit %d reached %d d %lld count %d s->c %x diff %lld stopped %d mode %d\n", s->irq, limit, s->reached?1:0, (ticks-s->count_load_time), count, s->count, s->expire_time - ticks, s->stopped, s->mode);

    if (s->mode != 1)

}

// timer callback

	// part of counter (user mode)

	if (s->mode != 1) {

	    // clear irq

	    s->count_load_time = qemu_get_clock(vm_clock);

	    s->reached = 0;

	    return s->limit;

    slavio_timer_get_out(s);

}

{

    int slavio_timer_io_memory;

    SLAVIO_TIMERState *s;

        return;

    s->irq = irq;

    s->mode = mode;

    s->irq_timer = qemu_new_timer(vm_clock, slavio_timer_irq, s);

    slavio_timer_io_memory = cpu_register_io_memory(0, slavio_timer_mem_read,

    qemu_register_reset(slavio_timer_reset, s);

    slavio_timer_reset(s);

}