From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Kent Subject: Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer. Date: Tue, 21 Aug 2007 12:24:05 -0700 Message-ID: <1187724245.2562.28.camel@fuego> References: <20070817231149.544849769@gmail.com> <20070817231406.493008599@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-TtF/mJH4Jtrk1uMJSBkQmQ@public.gmane.org To: qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org Return-path: In-Reply-To: <20070817231406.493008599-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On Sat, 2007-18-08 at 01:11 +0200, Luca Tettamanti wrote: > plain text document attachment (clock-hpet) > Linux operates the HPET timer in legacy replacement mode, which means that > the periodic interrupt of the CMOS RTC is not delivered (qemu won't be able > to use /dev/rtc). Add support for HPET (/dev/hpet) as a replacement for the > RTC; the periodic interrupt is delivered via SIGIO and is handled in the > same way as the RTC timer. > > Signed-off-by: Luca Tettamanti I must be missing something silly here.. should I be able to open more than one instance of qemu with -clock hpet? Because upon invoking a second instance of qemu HPET_IE_ON fails. I also tried running the example in the kernel docs under Documentation/hpet.txt mkent@localhost [/home/mkent]# ./demo poll /dev/hpet 1 1000 -hpet: executing poll hpet_poll: info.hi_flags 0x0 hpet_poll: expired time = 0x8 hpet_poll: revents = 0x1 hpet_poll: data 0x1 mkent@localhost [/home/mkent]# ./demo poll /dev/hpet 1 1000 -hpet: executing poll hpet_poll: info.hi_flags 0x0 hpet_poll, HPET_IE_ON failed This is on 2.6.23-rc3 x86_64 with the patch-2.6.23-rc3-hrt2.patch hrtimers patch. -- Matthew Kent http://magoazul.com ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/