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| Paging help https://forum.osdev.org/viewtopic.php?f=1&t=56344 |
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| Author: | YDeeps1 [ Thu Jun 30, 2022 4:08 am ] |
| Post subject: | Paging help |
I am quite new to paging and I am quite confused by it. Mainly I am wondering what the first steps should be to enabling paging - what should I do? How should I handle pages during context switches? Why do both the page directory and entry want a 12 bit address? What are the differences? I am getting weird undefined behavior after enabling paging and so I assume I need to perform some kind of kernel mapping - how do I make it map to a physical address by default? Thanks! |
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| Author: | iansjack [ Thu Jun 30, 2022 5:54 am ] |
| Post subject: | Re: Paging help |
Although written with Rust in mind, rather than C, this article https://os.phil-opp.com/paging-introduction/ gives a good introduction to paging and how it is implemented on x86 processors. As to your specific question about context switches, each process will have its own page table; when switching processes you update cr3 to point to the appropriate table. |
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