Advanced Paging

This post explains techniques to make the physical page table frames accessible to our kernel. It then uses such a technique to implement a function that translates virtual to physical addresses. It also explains how to create new mappings in the page tables.

This blog is openly developed on GitHub. If you have any problems or questions, please open an issue there. You can also leave comments at the bottom. The complete source code for this post can be found here.

🔗Introduction

🔗Summary

In this post we learned how a recursive level 4 table entry can be used to map all page table frames to calculatable virtual addresses. We used this technique to implement an address translation function and to create a new mapping in the page tables.

We saw that the creation of new mappings requires unused frames for creating new page tables. Such a frame allocator can be implemented on top of the boot information structure that the bootloader passes to our kernel.

🔗What's next?

The next post will create a heap memory region for our kernel, which will allow us to allocate memory and use various collection types.