* [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
end of thread, other threads:[~2012-06-15 9:11 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 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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