Will OEMinterruptHandler be preempted by a higher priority IRQ?

From: "news.microsoft.com" <li.ning@xxxxxxxxxxxxxxxx>
Date: Tue, 31 May 2005 10:50:19 +0800

Dear All,
I am using ARM920t and WinCE4.2.
I am doing one installable ISR for my device driver.

My question is that the OEMInterruptHandler can be preempted by a higher
priority external IRQ,such as ethernet,UART,etc.?

WindowCE said it support nested interrupt, but I think ARM cpu have only one
IRQ, so when OEMInterruptHandler is being excuted, nobody can preempt it. Am
I right?
If yes, the installable ISR will reduce the response time of the whole
system, right?

Thank you.

Lee

.

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