937 B
937 B
MEMOMY
Pagination
To activate pagination you must put the physic pd address in the cr3 register and 0x80000000 in the cr0 register. Now the MMU will translate your address
Our setup
Cause create all pt will cost 3MB (768 * 1024 * 4, 768: cause is our heap limite, 1024: cause each pt contains 1024 entry and 4: cause size of pte is 4byte) we decided to create it on the heap and dynamically. So the first pt of the pd (pd[0]) will contain a default_page_table (or heap_pt). Each page create by each the heap_pt will be a pt added to the pd.
Page Directory
| Name | Addresss |
|---|---|
| 0 | left empty so read or write on NULL triggers an interrupt |
| 1-767 | user process allocations |
| 768 | kernel code and stack |
| 769-1020 | kernel allocations |
| 1021 | VBE screen |
| 1022 | frame allocator variables |
| 1023 | multiboot |