mips74k and duplicate TLB entries

[Adrian Chadd]

And that's the question.

Hence why I shipped you an AR9344 mips74k board. :-)



-adrian

On 9 July 2013 22:26, Warner Losh <imp at bsdimp.com> wrote:
> So why are there three entries for things in kseg0?
>
>         • #1      => ffffffff80000000
>         •  Lo0    0       (0)
>         •  Lo1    17747   (0x5dd000)
>         • #4      => ffffffff80006000
>         •  Lo0    0       (0)
>         •  Lo1    1       (0)
>         • #12     => ffffffff80016000
>         •  Lo0    0       (0)
>         •  Lo1    173c7   (0x5cf000)
>         • #14     => ffffffff8001a000
>         •  Lo0    0       (0)
>         •  Lo1    7d087   (0x1f42000)
>         • #19     => ffffffff80024000
>         •  Lo0    0       (0)
>         •  Lo1    16947   (0x5a5000)
>         • #22     => ffffffff8002a000
>         •  Lo0    0       (0)
>         •  Lo1    17007   (0x5c0000)
>         • #31     => ffffffff8003c000
>         •  Lo0    0       (0)
>         •  Lo1    16f87   (0x5be000)
>
> and why are there two entries for 0xc0108000?
>
>         • #5      => ffffffffc0108000
>         •  Lo0    1b147   (0x6c5000)
>         •  Lo1    177c7   (0x5df000)
>         • #29     => ffffffffc0108000
>         •  Lo0    1b147   (0x6c5000)
>         •  Lo1    16b47   (0x5ad000)
>
> to two different PFNs no less, at least for the upper page?
>
> Warner
>
> On Jul 9, 2013, at 10:51 PM, Adrian Chadd wrote:
>
>> Hi all,
>>
>> I've started bringing up FreeBSD-HEAD on the AR9344 which is a MIPS
>> 74k core. It panics shortly after boot, in the invalidation code.
>> We've traced it down thus far to duplicate entries in the TLB.
>>
>> An example TLB list:
>>
>> http://pastebin.ca/2423778
>>
>> Now, I think it's something in MipsDoTLBMiss or
>> MipsTLBInvalidException in exception.S.
>>
>> I'm out of my depth here. Could I please get some help in figuring out
>> what's going on?
>>
>> Thanks!
>>
>>
>> -adrian
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