Memory: Using the Page Table
CS 321 Lecture,
Dr. Lawlor, 2006/02/17
The UNIX system calls to manipulate the page table are:
Here's an example of how to call mmap.
- mmap to put physical memory at a given location in program virtual memory, and optionally copying a file's contents there.
- munmap to remove physical memory from a given location in virtual memory.
changes your access rights on a particular piece of memory. For
example, you can remove your right to write to a particular chunk of
- brk and sbrk
are older (pre-mmap) calls that adjust the "heap boundary", adding
zero-filled physical memory at the end of the heap virtual address
space. They can now be replaced with calls to mmap.
The Windows calls to manipulate the page table are:
puts physical memory at a given virtual address. You first have
to MEM_RESERVE, then MEM_COMMIT a range of virtual addresses.
- VirtualFree removes physical memory from a given virtual address.