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PPC: mac99: Fix core99 timer frequency

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There is a special timer in the mac99 machine that we recently started
to emulate. Unfortunately we emulated it in the wrong frequency.

This patch adapts the frequency Mac OS X uses to evaluate results from
this timer, making calculations it bases off of it work.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2014-07-13 16:45:46 +02:00
parent 6fd33a7502
commit d696760b43
1 changed files with 7 additions and 2 deletions
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9
hw/misc/macio/macio.c
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@ -243,13 +243,18 @@ static void timer_write(void *opaque, hwaddr addr, uint64_t value,
static uint64_t timer_read(void *opaque, hwaddr addr, unsigned size)
{
uint32_t value = 0;
uint64_t systime = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint64_t kltime;
kltime = muldiv64(systime, 4194300, get_ticks_per_sec() * 4);
kltime = muldiv64(kltime, 18432000, 1048575);
switch (addr) {
case 0x38:
value = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
value = kltime;
break;
case 0x3c:
value = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 32;
value = kltime >> 32;
break;
}