Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap

[H. Peter Anvin]

On 04/03/2013 06:11 PM, Simon Jeons wrote:
> 
> Why we consider boot_cpu_data.x86_phys_bits instead of e820 map here?
> 

Because x86_phys_bits is what controls how much address space the
processor has.  e820 tells us how much *RAM* the machine has, or
specifically, how much RAM the machine had on boot.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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