x86 memory detection

[Rajat Sharma]

On most of the x86 linux boxes, I have seen it to be 2 or other
variants where boot loader informs about memory map.

-Rajat

On Thu, Feb 3, 2011 at 10:18 AM, Arun S <inbox1.arun at gmail.com> wrote:
> Hi,
>  How does the kernel detects the amount of available System RAM in the
> system under x86 architecture?.
> Under 2.6.x kernels,
>
> 1. Does it use BIOS interrupt 15 for determining the RAM
>  OR
> 2. Does the boot loader fills the e820_map as explained
> inDocumentation/x86/boot.txt &   Documentation/x86/zero-page.txt  and the
> kernel uses in information
> OR
> 3. Is there any other mechanism (if so, in which file under kernel tree I
> can find this detection code)
>
>
> Thanks,
> Arun
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