Il 22/03/2012 11:29, Stefano Stabellini ha scritto:
>> The purpose of using two timer is trying to keep the UF, AF and UIP
>> synchronous. User can poll UIP to check UF and AF bit. If we use
>> timer for UF/AF bit track and check UIP by another way, since the
>> timer will be fired with delay, then
On Wed, 21 Mar 2012, Paolo Bonzini wrote:
> Il 21/03/2012 17:54, Stefano Stabellini ha scritto:
> >> >
> >> > No, you need to set UF in case the code observes it without actually
> >> > enabling interrupt delivery on the ISA bus.
> >
> > Well, if it is just about updating UF, can we do it only w
On Thu, 22 Mar 2012, Zhang, Yang Z wrote:
> > -Original Message-
> > From: Stefano Stabellini [mailto:stefano.stabell...@eu.citrix.com]
> > Sent: Wednesday, March 21, 2012 2:04 AM
> >
> > On Mon, 19 Mar 2012, Zhang, Yang Z wrote:
> > > Use a timer to emulate update cycle. When update cycle
> -Original Message-
> From: Stefano Stabellini [mailto:stefano.stabell...@eu.citrix.com]
> Sent: Wednesday, March 21, 2012 2:04 AM
>
> On Mon, 19 Mar 2012, Zhang, Yang Z wrote:
> > Use a timer to emulate update cycle. When update cycle ended and UIE is
> setting, then raise an interrupt.
Il 21/03/2012 17:54, Stefano Stabellini ha scritto:
>> >
>> > No, you need to set UF in case the code observes it without actually
>> > enabling interrupt delivery on the ISA bus.
>
> Well, if it is just about updating UF, can we do it only when the user
> reads REG_C?
Perhaps, but for AF it is
On Wed, 21 Mar 2012, Paolo Bonzini wrote:
> Il 20/03/2012 19:35, Stefano Stabellini ha scritto:
> > This is the function that is used to figure out whether we need the
> > timers or not, the condition seems to be:
> >
> > (Not (REG_C_UF | REG_C_AF)) And (Not (REG_B_SET))
> >
> > Shouldn't actuall
Il 20/03/2012 19:35, Stefano Stabellini ha scritto:
> This is the function that is used to figure out whether we need the
> timers or not, the condition seems to be:
>
> (Not (REG_C_UF | REG_C_AF)) And (Not (REG_B_SET))
>
> Shouldn't actually check for UIE being enabled?
No, you need to set UF i
> +/* handle update-ended timer */
> +static void check_update_timer(RTCState *s)
> +{
> +uint64_t next_update_time, expire_time;
> +uint64_t guest_usec;
> +qemu_del_timer(s->update_timer);
> +qemu_del_timer(s->update_timer2);
> +
> +if (!((s->cmos_data[RTC_REG_C] & (REG_C_UF |
On Mon, 19 Mar 2012, Zhang, Yang Z wrote:
> Use a timer to emulate update cycle. When update cycle ended and UIE is
> setting, then raise an interrupt. The timer runs only when UF or AF is
> cleared.
The idea is that if the user requests the update-ended interrupt (UIE)
we setup a timer to injec
Use a timer to emulate update cycle. When update cycle ended and UIE is
setting, then raise an interrupt. The timer runs only when UF or AF is cleared.
Signed-off-by: Yang Zhang
---
hw/mc146818rtc.c | 86 ++
1 files changed, 80 insertions(+)
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