| To: | Kanoj Sarcar <kanoj@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Tlb shutdown bit |
| From: | Ralf Baechle <ralf@xxxxxxxxxxx> |
| Date: | Fri, 7 Apr 2000 01:15:21 -0700 |
| Cc: | linux-origin@xxxxxxxxxxx, sprasad@xxxxxxxxxxxxxxxxxxx |
| In-reply-to: | <200004062212.PAA40317@google.engr.sgi.com>; from kanoj@google.engr.sgi.com on Thu, Apr 06, 2000 at 03:12:34PM -0700 |
| References: | <200004062212.PAA40317@google.engr.sgi.com> |
| Sender: | owner-linux-origin@xxxxxxxxxxx |
On Thu, Apr 06, 2000 at 03:12:34PM -0700, Kanoj Sarcar wrote: > It looks like when the first processor starts executing the Linux > kernel entry point (from the IO6prom), it already has the TS (tlb > shutdown) bit set. I am wondering why this might happen. Note that > the Linux kernel is not loaded at xkphys (0xa800....), but rather > at ckseg0 (0xffffffff80...). Maybe I'm now talking complete bull since I don't have the manuals at hand nor can find one at this time, but anyway ... Afair the TS bit in the R10000 can never be set because on tlbwi / tlbwr the processor examines all entries for a hit at the virtual address etc. of the new entry. If so, these entries will be invalidated. Good night ... Ralf |
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