Paging

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Overview

Paging is a memory scheme that breaks up memory in groups of pages that are constantly swapped between hard disk and computer. This allows for one to appear as though they have more memory than they actually do.

MMU

Paging is achieved through the use of the MMU. This section will discuss specifics of the unit for the x86 architecture. (Page tables, etc.)

Enabling

Enabling paging is actually very simple. All that is needed is to load CR3 with the address of the page directory and to set the paging bit of CR0.

mov eax, [page_directory]
mov cr3, eax

mov eax, cr0
or eax, 0x80000000
mov cr0, eax

Usage

Todo

Page Faults

A page fault is an exception caused when a process is seeking to access an area of virtual memory that is not mapped to any physical memory.

Handling

Todo

See Also

Articles

• Identity Paging
• Page Frame Allocation

External Links

Paging Tutorial