| Re: [hatari-devel] Hatari and OUTSIDE (virtual memory manager) |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Hatari and OUTSIDE (virtual memory manager)
- From: Andreas Grabher <andreas_g86@xxxxxxxxxx>
- Date: Tue, 02 Oct 2018 19:05:43 +0200
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Am 02.10.2018 um 18:40 schrieb Toni Wilen <twilen@xxxxxxxxxx>:
>> Toni, I read the 68000 family's PRM for PTEST and I don't see a mention
>> for checking TTR regs when ptest's level is > 0.
>> In the MMU status register, bit "transparent" is only updated for a
>> level=0 operation.
>>
>> Could there be an error in this part of the emulation ?
>
> Yeah, it looks like it is wrong. It would make no sense to do TTR check
> when MMUSR T bit is documented as being zero if PTEST level 1-7.
>
> 68030 MMU is far too complex and too weird.. (At least it is far less
> weird than 68851..)
>
I agree that this might be a mistake in the MMU emulation code. But I think some testing and confirmation is required before changing behavior.