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32-Bit OS

 
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OldCheatEngineUser
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PostPosted: Thu Jul 12, 2018 3:56 pm    Post subject: 32-Bit OS Reply with quote

since all 32-bit operating systems allow maximum physical memory 4GB, is there anyway around to use more than this amount using 64-bit processor?

i know the fact for the limitation is because the addressing space is limited in 32-bit hardware and software.

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PostPosted: Thu Jul 12, 2018 4:56 pm    Post subject: Reply with quote

For Windows 8.1 there is a patch you can get to activate a hidden feature that Microsoft left disabled by default called 'Physical Address Extension Mode' which can bypass the 4GB limit. It switches the OS to use a 36bit addressing setup rather than 32bit which extends the system to be able to use a maximum of 64gigs.

You can read more about PAE here:
http://en.wikipedia.org/wiki/Physical_Address_Extension

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PostPosted: Thu Jul 12, 2018 5:15 pm    Post subject: Reply with quote

so its only for win8.1?
and there is nothing for win7 x86?

any other solutions?

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PostPosted: Fri Jul 13, 2018 12:18 am    Post subject: Reply with quote

there are some ramdisks that make use of that memory in older windows versions. (that have implemented the no-execute paging support as that requires PAE)

i guess you could write a driver just for your app to use it as well. let the driver 'allocate' memory in the 4gb+ region and then adjust the pagetable entries of your process to point to there

keep in mind applications still only have a 2GB(or 3GB depending on a switch) of virtual memory

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OldCheatEngineUser
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PostPosted: Thu Jul 19, 2018 7:56 am    Post subject: Reply with quote

i read about PAE in wiki and intel ia-32 sdm.

but didnt get much really, i think i need to understand more topics in order to fully understand this.

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PostPosted: Thu Jul 19, 2018 9:14 am    Post subject: Reply with quote

pae switches the paging system from 32 bit pointers to 64 bit pointers (and changes the number if pagelevels from 2 to 3 by adding the pagedirptr table which points to pagedirs)
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PostPosted: Tue Jul 24, 2018 3:43 am    Post subject: Reply with quote

hmm seems no drivers really needed, read this.
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PostPosted: Tue Jul 24, 2018 4:07 am    Post subject: Reply with quote

only if your os version has that capability. i remember that Microsoft didn't allow 4G+ to be used by customer versions, only enterprise ones
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