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fuguipingan Newbie cheater Reputation: 0
Joined: 13 May 2019 Posts: 11
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Posted: Mon May 13, 2019 9:38 pm Post subject: Stop address is 0000_7fff_ffff_ffff not 7fff_ffff_ffff_ffff |
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I thought the user space is lower half of memory space. But my cheat engine always default to 0000_7fff_ffff_ffff not 7fff_ffff_ffff_ffff as stop address for search. I had to manually change it often to make each search comprehensive.
Did I miss some setting?
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ParkourPenguin I post too much Reputation: 140
Joined: 06 Jul 2014 Posts: 4289
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Posted: Mon May 13, 2019 9:52 pm Post subject: |
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Most OSs don't use the full 2^64 bytes of memory available because it's more efficient to limit it to less. The address space range can vary between windows versions, but the first 47 bits are enough to cover everything right now.
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Dark Byte Site Admin Reputation: 458
Joined: 09 May 2003 Posts: 25287 Location: The netherlands
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Posted: Mon May 13, 2019 10:36 pm Post subject: |
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it's nit the os, it's the CPU.
They don't fully support 64 bit addressing yet
initially cpu's only supported 4 pagetable levels, but there are already some that support 5 levels, though that still isn't enough for full 64 bit
also, if there are more page levels it has to go through it will likely slow down the system, which is probably one of the designreasons cpu's didn't start with pml5+
also, CE asks windows what it's max usermode address is and shows that, so it it does support pml5 it will use it
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fuguipingan Newbie cheater Reputation: 0
Joined: 13 May 2019 Posts: 11
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Posted: Mon May 13, 2019 10:40 pm Post subject: |
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Dark Byte wrote: | it's nit the os, it's the CPU.
They don't fully support 64 bit addressing yet
initially cpu's only supported 4 pagetable levels, but there are already some that support 5 levels, though that still isn't enough for full 64 bit
also, if there are more page levels it has to go through it will likely slow down the system, which is probably one of the designreasons cpu's didn't start with pml5+
also, CE asks windows what it's max usermode address is and shows that, so it it does support pml5 it will use it |
Thanks for the explanation.
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OldCheatEngineUser Whateven rank Reputation: 20
Joined: 01 Feb 2016 Posts: 1587
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Posted: Tue May 14, 2019 8:23 am Post subject: |
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according to intel plans pml5 will extend addressing space from 48bits to 57bits, but i dont see a good reason for it as it will cause more overhead more power consumption more ram resource.
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