starnakin/42_KFS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

doc: explain the default_page_table

Browse Source
This commit is contained in:
Starnakin 2024-10-30 21:39:51 +01:00
parent 6533334824
commit a72c3ca195
2 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
documentation/assets/memory/heap_map.webp Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 8.9 KiB

7
documentation/memory.md
View File

@ -2,4 +2,9 @@
## Pagination ## Pagination
To activate pagination you must put the physic [pd](./memory/page_directory.md) address in the cr3 register and 0x80000000 in the cr0 register. Now the [MMU](./memory/mmu.md) will translate your address To activate pagination you must put the physic [pd](./memory/page_directory.md) address in the cr3 register and 0x80000000 in the cr0 register. Now the [MMU](./memory/mmu.md) will translate your address
### Our setup
Cause create all [pt](./memory/page_table.md) 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.
![](./assets/memory/heap_map.webp)