Messages in this thread | | | Date | Thu, 11 Apr 2013 10:40:29 +0800 | From | Simon Jeons <> | Subject | Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap |
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Hi H.Peter, On 04/04/2013 09:13 AM, H. Peter Anvin wrote: > 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.
I have 8GB memory in my machine, but when I accumulated every e820 ranges which dump in dmesg, there are 25MB memory less then 8GB(1024*8) memory, why 25MB miss?
> > -hpa >
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