OSDev.org

Posted: **Wed Oct 12, 2016 6:38 am**

In http://wiki.osdev.org/Paging#Manipulation

I think the following line is wrong here:

    unsigned long * pt = ((unsigned long *)0xFFC00000) + (0x400 * pdindex);

I think it needs to be

    unsigned long * pt = ((unsigned long *)0xFFC00000) + (0x1000 * pdindex);

Am I wrong ?

Posted: **Wed Oct 12, 2016 6:51 am**

When adding to pointers the offset is multiplied by the pointee's size:

int *p = ...
p += 5; //adds 5*sizeof(int)

short *p = ...
p += 3; //add 3*sizeof(short)

Posted: **Wed Oct 12, 2016 7:00 am**

You're right I missed a parenthesis. thought the the casting to unsigned long * was after the multiplication.

error in paging page ?