Windows - Bios mapping to kernel address space

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Kamala
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Joined: Sun Nov 28, 2010 11:03 am

Windows - Bios mapping to kernel address space

Post by Kamala »

Hi,

I was recently looking at the windows kernel address space layout and noticed that physical address 0xf0000 (bios page) is mapped several hundred times (roughly .7Mb) in windows kernel address space (pte type - syspte). I wasn't able to justify the need for such a large mapping to the same physical page and was wondering if there is an obvious reason to that which I am missing? Thought I would check before I start tracing the kernel allocation code to dig deeper. Please let me know if you have any thoughts on this. Thanks.

Kamala
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Wajideu
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Joined: Wed Jul 30, 2014 1:05 am

Re: Windows - Bios mapping to kernel address space

Post by Wajideu »

Redundancy for stability? Driver slots? Idk. That's the best I can think of.
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