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Re: [Qemu-devel] Broken Microblaze timer
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From: |
Peter Chubb |
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Subject: |
Re: [Qemu-devel] Broken Microblaze timer |
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Date: |
Fri, 15 Jun 2012 15:07:55 +1000 |
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User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (Gojō) APEL/10.8 Emacs/23.4 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
>>>>> "Peter" == Peter Crosthwaite <address@hidden> writes:
Peter> So ptimer has safeguards against misuse in periodic mode but
Peter> not one-shot mode? This strikes me as inconsistent. I.E. for
Peter> one use case the safeguard is in ptimer, and the other in the
Peter> client device. I think if we are in the bussiness of putting
Peter> these safeguards in ptimer itself then it should be there for
Peter> all use cases yes? I.E. the fix for this is making sure
Peter> one-shot ptimer give the cpu a look in.
When a one-shot timer fires, it has to be reset by the CPU before
it'll fire again. So the CPU always gets a look in --- or ought to.
--
Dr Peter Chubb peter.chubb AT nicta.com.au
http://www.ssrg.nicta.com.au Software Systems Research Group/NICTA