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OS-Tutorial

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eerikdubbelboer committed 14 years ago
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eerikdubbelboer committed 14 years ago

README

The README file for this repository.

OS Tutorial by Erik Dubbelboer

This tutorial shows how to use GRUB to boot a Kernel that is linked to a different location than it is loaded to.

The Kernel is linked to C0100000 but is loaded to 100000. The first thing that it does is setup paging so it can start executing at the address it is linked to.

physical memory layout:

   0 -   100000	GRUB, BIOS		1MB

100000 - 120000 Kernel 128KB 120000 - 124000 Boot Stack 16KB 124000 - 125000 Boot Page-Directory 4KB 125000 - 127000 2 Boot Page-Tables 8KB 127000 - FFFFFFFF Unused

virtual memory layout: 0 - 200000 1:1 mapping of the first 2MB of memory 200000 - C0000000 Not mapped C0000000 - C0200000 1:1 mapping of the first 2MB of memory C0200000 - FFFFFFFF Not mapped