OSDev.org

Posted: **Mon Nov 23, 2015 5:20 am**

http://wiki.osdev.org/Paging

In this article they specify the PDE format and explain the various flag bits.
but they don't give an explanation to what bits 9 to 11 do !
They are just named `Ignored` and `Avail`

Can someone shed some light on this ?

Posted: **Mon Nov 23, 2015 5:32 am**

As it says, the processor ignores these bits. So they don't do anything unless you choose to use them and define your own meaning.

Posted: **Mon Nov 23, 2015 9:38 pm**

Intel has explicitly reserved them for the operating system to use as it chooses for its own accounting.

OSDev.org

What are the Ignored and Avail bits in the page directory ?

What are the Ignored and Avail bits in the page directory ?

Re: What are the Ignored and Avail bits in the page director

Re: What are the Ignored and Avail bits in the page director