In the chapter related to the GDT, we saw that using segmentation a physical memory address is calculated using a segment selector and an offset.

In this chapter, we are going to implement paging, paging will translate a linear address from segmentation into a physical address.

Paging will allow our kernel to:

• use the hard-drive as a memory and not be limited by the machine ram memory limit
• to have a unique memory space for each process
• to allow and unallow memory space in a dynamic way

In a paged system, each process may execute in its own 4gb area of memory, without any chance of effecting any other process's memory, or the kernel's. It simplified multitasking.