lkml.org 
[lkml]   [2013]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] x86: add phys addr validity check for /dev/mem mmap
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.

e820 also contain mmio, correct? So cpu should not access address beyond
e820 map(RAM+MMIO).

>
> -hpa
>



\
 
 \ /
  Last update: 2013-04-04 03:41    [W:0.092 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site