Messages in this thread | | | Date | Wed, 03 Apr 2013 18:13:35 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap |
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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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