Re: [B2-devel] Macintosh memory information?

[Frank T. <fra...@gm...>]

There is stuff of interest in Inside Macintosh: PowerPC System Software and
Inside Macintosh: Memory. The former is available on-line but not the
latter. This (
http://www.mindfiresolutions.com/mindfire/Mac_Memory_Manager.pdf ) may have
some of what you need.

On Wed, Jul 18, 2012 at 8:49 AM, Frank Trampe <fra...@gm...>wrote:

> I think that you need the PowerPC edition/addition of Inside Macintosh. I
> will try to check on this in a few hours. I believe that there is a copy
> available on-line somewhere, but I can scan the pages that you need if not.
>
>
> On Wed, Jul 18, 2012 at 7:21 AM, Alexander von Gluck <
> kal...@un...> wrote:
>
>> Does anyone have any documentation on the memory layout of the old world
>> Macintosh? (Performa 6400 era)
>>
>> I've been looking to rework how SheepShear manages memory and it's not
>> completely clear to me how it does
>> it's memory translation.  Most of the bugs I've seen on x86_64 are due to
>> the exact memory mapping on emulated
>> powerpc systems (eg, hard coded memory addresses we *have* to map for
>> things
>> to function) and something getting mangled
>> on x86_64.
>> https://github.com/kallisti5/sheepshear/issues/15#issuecomment-7045089
>>
>> I see memory maps for the really early Mac's, but am failing to find
>> anything for the later old world machines
>> online or in the old Macintosh service manuals.
>>
>> Here is what I know for a fact looking at the code:
>>
>> Low memory area, - 0x0        - 0x3000  (static 1:1 host:guest location)
>> RAM,               0x0        - (memory size selected less then 1GB)
>> ROM,               0x40800000 - 0x40C00000 (4MB mac rom)  (static 1:1
>> host:guest location)
>>
>> Real addressing == "normal" allocation where memory locations are dynamic,
>> and we translate addresses to match
>> Direct addressing == memory is directly addressed, mostly used on native
>> PowerPC?
>> Nat_mem offset == ???, guessing it's for native PowerPC
>>
>> It looks given the code below that the Macintosh has to be patched to use
>> the host memory
>> addresses vs the emulator doing the memory translation (SheepShear acting
>> as
>> a mmu to the guest)
>>
>> https://github.com/kallisti5/sheepshear/blob/master/src/kpx_cpu/src/cpu/vm.hpp#L185
>>
>> The reason I ask here is because these changes could be pulled upstream to
>> SheepShaver.
>>
>>   -- Thanks!
>>     Alex
>>
>>
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>
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