> In this case the problem is double mapping with inconsistent attributes > (through BAT and page tables I assume).
Yes. > > On POWER4, 970 and later, the chip guys confirmed that the problem is > > real though. Not only bcs of prefetch but also speculative execution > > which can cause the chip to do a load that will never actually be > > executed. Imagine for example a loop walking an array, the chip might > > speculatively load elements beyond the array by speculatively executing > > beyond the branch that ends the loop. > > Even if the page has the guarded bit set? The BAT mapping doesn't have G set. Ben. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
