Date: Thu, 15 Jun 2006 21:23:54 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: apic detection Message-ID: <4491A5BA.9060801@icyb.net.ua> In-Reply-To: <200606151310.34246.jhb@freebsd.org> References: <44903A53.9030007@icyb.net.ua> <200606151310.34246.jhb@freebsd.org>
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on 15/06/2006 20:10 John Baldwin said the following: > On Wednesday 14 June 2006 12:33, Andriy Gapon wrote: >> What is proper way to check from a driver/module if APIC is being used ? >> Or even narrower, if local APIC timer is being used ? > > There isn't currently. Why do you need to know? > There is a driver that I am working on that could change frequency of local APIC timer by changing FSB frequency and I want to make that driver smarter and refuse to attach if local APIC timer is used. I know that in 6.X and CURRENT local APIC timer is always used and in 5.X it is never used, but I want my driver to handle environment more generally. I am thinking, can I just somehow check if IRQ0 is in use ? Would it be something close to proper solution ? -- Andriy Gapon
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