* [Qemu-devel] question about irq update
@ 2012-06-15 8:42 Zhi Hui Li
2012-06-15 9:04 ` Paolo Bonzini
0 siblings, 1 reply; 3+ messages in thread
From: Zhi Hui Li @ 2012-06-15 8:42 UTC (permalink / raw)
To: QEMU-devel, Kevin Wolf
In the code of libqtest.c have a function :
bool qtest_get_irq(QTestState *s, int num)
{
/* dummy operation in order to make sure irq is up to date */
qtest_inb(s, 0);
return s->irq_level[num];
}
but I don't know how it can make the irq up to date
and why we will read from the address of 0 ?
can anybody explain for me?
Thank you very much!
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] question about irq update
2012-06-15 8:42 [Qemu-devel] question about irq update Zhi Hui Li
@ 2012-06-15 9:04 ` Paolo Bonzini
2012-06-15 9:11 ` Zhi Hui Li
0 siblings, 1 reply; 3+ messages in thread
From: Paolo Bonzini @ 2012-06-15 9:04 UTC (permalink / raw)
To: Zhi Hui Li; +Cc: Kevin Wolf, QEMU-devel
Il 15/06/2012 10:42, Zhi Hui Li ha scritto:
>
> bool qtest_get_irq(QTestState *s, int num)
> {
> /* dummy operation in order to make sure irq is up to date */
> qtest_inb(s, 0);
>
> return s->irq_level[num];
> }
>
> but I don't know how it can make the irq up to date
> and why we will read from the address of 0 ?
It just forces libqtest to read any pending events.
Paolo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] question about irq update
2012-06-15 9:04 ` Paolo Bonzini
@ 2012-06-15 9:11 ` Zhi Hui Li
0 siblings, 0 replies; 3+ messages in thread
From: Zhi Hui Li @ 2012-06-15 9:11 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: Kevin Wolf, zhihuili, QEMU-devel
On 2012年06月15日 17:04, Paolo Bonzini wrote:
> It just forces libqtest to read any pending events.
Ok, Thank you very much! :)
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-06-15 8:42 [Qemu-devel] question about irq update Zhi Hui Li
2012-06-15 9:04 ` Paolo Bonzini
2012-06-15 9:11 ` Zhi Hui Li
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