Messages in this thread | | | Date | Mon, 14 Jul 2008 22:32:45 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH] x86: let 32bit use apic_ops too |
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[Maciej W. Rozycki - Mon, Jul 14, 2008 at 07:24:15PM +0100] | On Mon, 14 Jul 2008, Cyrill Gorcunov wrote: | | > Maciej, check me please (it's a bit shame but I don't understand the problem | > that deep) - we have only two errata here 3AP and 11AP. 3AP says - "Writes to | > error register clears register" so we don't care about locking there since | > our mostly task is to read error number or clear it (well we're recommened | > to write before read - but that is different and not related to the hw | > error). | > | > The second problem - 11AP says the following: "Back to back assertions of | > HOLD or BOFF# may cause lost APIC write cycle". For this case we use LOCK# | > since - HOLD is not recognized during LOCK cycles (as Intel docs says). | > | > Did I miss something? Or maybe it's completely out-of-topic? :) | | Check the text of the 11AP erratum -- we simply use one of the Intel's | recommended workarounds, which says that an APIC read instruction before | every APIC write instruction will avoid the problem. | | Maciej |
ok, thanks!
- Cyrill -
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