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From: John Baldwin <jhb@freebsd.org>
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Date: Mon, 19 Mar 2012 09:24:06 -0400
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	(bigwig.baldwin.cx); Mon, 19 Mar 2012 11:25:46 -0400 (EDT)
Cc: Yong Fan <yong.fan@exar.com>, "drivers@FreeBSD.org" <drivers@freebsd.org>
Subject: Re: How can I decide whether my code is running in interrupt
	context or not?
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On Thursday, March 15, 2012 10:06:13 pm Yong Fan wrote:
> Hi all,
> 
> In Linux, I can use in_interrupt() function.
> FreeBSD has such a similar kernel function for drivers?

Hmm, we do not, though the only part of your driver that can run in primary 
interrupt context is an interrupt filter.  If you mean interrupt-thread 
context (i.e. when sleeping is not permitted), then that would apply to your 
normal interrupt handler and any callout routines that you have.

-- 
John Baldwin