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cuda: minor cosmetic tidy-ups to get_next_irq_time()

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Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Mark Cave-Ayland 2018-02-09 18:51:36 +00:00 committed by David Gibson
parent 27c5cee1c3
commit 42a0938f92
1 changed files with 12 additions and 11 deletions

23
hw/misc/macio/cuda.c

@ -184,36 +184,37 @@ static void set_counter(CUDAState *s, CUDATimer *ti, unsigned int val)
cuda_timer_update(s, ti, ti->load_time);
}
static int64_t get_next_irq_time(CUDATimer *s, int64_t current_time)
static int64_t get_next_irq_time(CUDATimer *ti, int64_t current_time)
{
int64_t d, next_time;
unsigned int counter;
/* current counter value */
d = muldiv64(current_time - s->load_time,
d = muldiv64(current_time - ti->load_time,
CUDA_TIMER_FREQ, NANOSECONDS_PER_SECOND);
/* the timer goes down from latch to -1 (period of latch + 2) */
if (d <= (s->counter_value + 1)) {
counter = (s->counter_value - d) & 0xffff;
if (d <= (ti->counter_value + 1)) {
counter = (ti->counter_value - d) & 0xffff;
} else {
counter = (d - (s->counter_value + 1)) % (s->latch + 2);
counter = (s->latch - counter) & 0xffff;
counter = (d - (ti->counter_value + 1)) % (ti->latch + 2);
counter = (ti->latch - counter) & 0xffff;
}
/* Note: we consider the irq is raised on 0 */
if (counter == 0xffff) {
next_time = d + s->latch + 1;
next_time = d + ti->latch + 1;
} else if (counter == 0) {
next_time = d + s->latch + 2;
next_time = d + ti->latch + 2;
} else {
next_time = d + counter;
}
CUDA_DPRINTF("latch=%d counter=%" PRId64 " delta_next=%" PRId64 "\n",
s->latch, d, next_time - d);
ti->latch, d, next_time - d);
next_time = muldiv64(next_time, NANOSECONDS_PER_SECOND, CUDA_TIMER_FREQ) +
s->load_time;
if (next_time <= current_time)
ti->load_time;
if (next_time <= current_time) {
next_time = current_time + 1;
}
return next_time;
}