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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-ia64-devel] Where are DTR6 and DTRA defined and set?
Basically Isaku is correct, I suppose you are using Montecito, there are two threads per core. These two threads share TLB cache. There is a field "tid" in TLB entry to identify which thread this TLb entry belongs to. Usually TLB entry #0 belongs to thread 0 TLB entry #1 belongs to thread 1 TLB entry #2 belongs to thread 0 TLB entry #3 belongs to thread 1 And so on. - Anthony Isaku Yamahata wrote: > I guess the LSB 1 bit is used for thread id or something else. > Does the processor support threading? > > On Sat, May 31, 2008 at 12:11:49PM +0900, Isaku Yamahata wrote: >> Hi. >> >> Hmm, although I haven't ever used hw probe, it looks like that >> those indexes you reported are left shifted by one. >> Could you check the manual of your hardware probe? >> >> For VTi guest, Xen surely uses KENREL, PERCPU_DATA, >> (CURRENT_STACK if the stack isn't mapped by KERNEL), MAPPED_REGS and >> VHPT. So DTR0, 1, 2, 3, 5 should be valid. >> By shifting left them by one, we get 0, 2, 4, 6, A. >> Those are which you reported. >> >> thanks, >> >> On Fri, May 30, 2008 at 02:24:29PM -0700, Paul Leisy wrote: >>> Greetings, >>> >>> Using a hardware probe while running an HVM guest, I examined >>> the Data TLB to see what TRs Xen had setup. It showed that >>> DTR0,2,4,6,A were valid. Searching the Xen source code, I found >>> these defined: >>> >>> DTR0 = IA64_TR_KERNEL >>> DTR1 = IA64_TR_PERCPU_DATA >>> DTR2 = IA64_TR_CURRENT_STACK >>> DTR3 = IA64_TR_MAPPED_REGS >>> DTR4 = IA64_TR_SHARED_INFO >>> DTR5 = IA64_TR_VHPT >>> >>> But these were not found: >>> DTR6 = ???? >>> DTRA = ???? >>> >>> Can someone tell me where these DTRs are defined and >>> what code sets them up? >>> >>> Thanks, >>> -Paul Leisy >>> >>> _______________________________________________ >>> Xen-ia64-devel mailing list >>> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx >>> http://lists.xensource.com/xen-ia64-devel _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel
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