Hi all,
Question:
When we use 2 level paging(Directory+Table+Offset), does the page table entries have to be put exactly on the beginning of a page frame?
Description:
The format of Page Directory and Page Table are the same. And they all contain 20 bits as a pointer to the next level entries.
For Page Table entry, I understand that 20 bits is enough because page frames are 4k aligned. But for Page Directory entry, the 20 bits should be the address of a Page Table, that means the physical address of a Page Table entry should be 4k aligned too. And thus they may only exist at the beginning of a page frame.
Is this right or am I missing something?
Thanks.
Question:
When we use 2 level paging(Directory+Table+Offset), does the page table entries have to be put exactly on the beginning of a page frame?
Description:
The format of Page Directory and Page Table are the same. And they all contain 20 bits as a pointer to the next level entries.
For Page Table entry, I understand that 20 bits is enough because page frames are 4k aligned. But for Page Directory entry, the 20 bits should be the address of a Page Table, that means the physical address of a Page Table entry should be 4k aligned too. And thus they may only exist at the beginning of a page frame.
Is this right or am I missing something?
Thanks.
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