Setting Up Paging: Difference between revisions
Jump to navigation
Jump to search
| [unchecked revision] | [unchecked revision] |
Content deleted Content added
→Creating Your First Page Table: Page alignment notes |
→Creating a Blank Page Directory: Page alignment notes |
||
| Line 24: | Line 24: | ||
If you know where the end of your kernel is, then you can put the page directory right after it. |
If you know where the end of your kernel is, then you can put the page directory right after it. |
||
Note that all of your paging structures need to be at page aligned addresses, so it's probably a good idea to make a page allocator first and have that dish out pages for your paging code. |
Note that all of your paging structures need to be at page aligned addresses, so it's probably a good idea to make a page allocator first and have that dish out pages for your paging code. Until you create a proper page allocator though, simply finding the first free page-aligned address after the kernel will be fine. |
||
<pre> |
<pre> |
||
//the page directory comes right after the kernel - NOTE: make sure the address is page aligned! |
//the page directory comes right after the kernel - NOTE: make sure the address is page aligned! |
||
unsigned int |
unsigned int page_aligned_end = (((unsigned int*)end) & 0xFFFFF000) + 0x1000; |
||
unsigned int *page_directory = (unsigned int*)page_aligned_end; |
|||
</pre> |
</pre> |
||
| Line 35: | Line 36: | ||
<pre> |
<pre> |
||
//this is only a temporary solution. Find out where your kernel ends! |
//this is only a temporary solution. Find out where your kernel ends! |
||
unsigned int *page_directory = (unsigned int*) 0x9C000; |
unsigned int *page_directory = (unsigned int*) 0x9C000;//Make sure that this address is properly page aligned |
||
</pre> |
</pre> |
||