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doc: explain the default_page_table

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Starnakin 2024-10-30 21:39:51 +01:00
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## 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)