[LinuxBIOS] Silly Question

[Alan Carvalho de Assis]

Hi Joe

2007/3/26, joe at smittys.pointclark.net <joe at smittys.pointclark.net>:
> This is a silly question but, when I see something like this (2<<20)
> in raminit.c it is saying to change bit 20 to a value of 2?? Is that
> correct?? That would have to be a binary value than right? Than what
> would that look like?? Just trying to understand the whole registry
> setting thing better.
>

This is a shift operation, then you need think it in binary:

2 = 10 (binary)

10 << 20 = 1000000000000000000000

This operation is just to set the 22th bit.
This is equivalent to 1 << 21.

More info read about shift operation:

http://en.wikipedia.org/wiki/Arithmetic_shift

> Thanks - Joe
>

Cheers,

Alan