michaelkuc6/blog_os
1
0
Fork 0
mirror of https://github.com/phil-opp/blog_os.git synced 2025-12-16 22:37:49 +00:00
Code Issues Projects Releases Wiki Activity

12KiB is 0x3000 in hex, not 0xc000

Browse Source
This commit is contained in:
Philipp Oppermann
2019-09-29 15:10:17 +02:00
parent 9877e4c84d
commit 0b971c9128
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
blog/content/second-edition/posts/08-paging-introduction/index.md
View File

@@ -167,8 +167,8 @@ With these indices, we can now walk the page table hierarchy to determine the ma
- The level 4 index is 1, so we look at the entry with index 1 of that table, which tells us that the level 3 table is stored at address 16KiB.
- We load the level 3 table from that address and look at the entry with index 0, which points us to the level 2 table at 24KiB.
- The level 2 index is 511, so we look at the last entry of that page to find out the address of the level 1 table.
- Through the entry with index 127 of the level 1 table we finally find out that the page is mapped to frame 12KiB, or 0xc000 in hexadecimal.
- The final step is to add the page offset to the frame address to get the physical address 0xc000 + 0x5ce = 0xc5ce.
- Through the entry with index 127 of the level 1 table we finally find out that the page is mapped to frame 12KiB, or 0x3000 in hexadecimal.
- The final step is to add the page offset to the frame address to get the physical address 0x3000 + 0x5ce = 0x35ce.
![The same example 4-level page hierarchy with 5 additional arrows: "Step 0" from the CR3 register to the level 4 table, "Step 1" from the level 4 entry to the level 3 table, "Step 2" from the level 3 entry to the level 2 table, "Step 3" from the level 2 entry to the level 1 table, and "Step 4" from the level 1 table to the mapped frames.](x86_64-page-table-translation-steps.svg)