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Add HPET emulation to qemu (Beth Kon)

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This patch adds HPET emulation.  It can be disabled with -disable-hpet.  An hpet
provides a more finely granular clocksource than otherwise available on PC.
This means that latency-dependent applications (e.g. multimedia) will generally
be smoother when using the HPET.

Signed-off-by: Beth Kon <eak@us.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6081 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-12-17 23:28:44 +00:00
parent 0bacd1300d
commit 16b29ae180
13 changed files with 938 additions and 6 deletions
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21
hw/i8254.c
View file

@ -463,6 +463,27 @@ static void pit_reset(void *opaque)
}
}
/* When HPET is operating in legacy mode, i8254 timer0 is disabled */
void hpet_pit_disable(void) {
PITChannelState *s;
s = &pit_state.channels[0];
qemu_del_timer(s->irq_timer);
}
/* When HPET is reset or leaving legacy mode, it must reenable i8254
* timer 0
*/
void hpet_pit_enable(void)
{
PITState *pit = &pit_state;
PITChannelState *s;
s = &pit->channels[0];
s->mode = 3;
s->gate = 1;
pit_load_count(s, 0);
}
PITState *pit_init(int base, qemu_irq irq)
{
PITState *pit = &pit_state;