Re: How to tell whether an address is from low-memory or high-memory ?

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What architecture are you referring to?

"High memory" and "Low memory" apply to x86_32 (see arch/x86/Kconfig),
but not to x86_64, where all physical memory is directly usable by the
kernel (see Documentation/x86/x86_64/mm.rst).

On Thu, Nov 14, 2019 at 4:30 PM William Tambe <tambewilliam@xxxxxxxxx> wrote:
>
> How to tell whether an address is from low-memory or high-memory ?
>
> And are addresses in low-memory always a 1-to-1 mapping to physical memory ?



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