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Fix alt text for image

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Philipp Oppermann
2018-12-13 18:32:21 +01:00
parent 7fbbaa6d60
commit aa55d2639a
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blog/content/second-edition/posts/09-paging/index.md
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@@ -158,7 +158,7 @@ The physical address of the currently active level 4 page table, which is the ro
The above page table hierarchy maps two pages (in blue). The start addresses of these pages are `0x803FE7F000` and `0x803FE00000`. Let's see what happens when the program tries to read from address `0x803FE7F5CE`. First, we convert the address to binary and determine the page table indices and the page offset for the address:
![An example 4-level page hierarchy with each page table shown in physical memory](x86_64-page-table-translation-addresses.svg)
![The sign extension bits are all 0, the level 4 index is 1, the level 3 index is 0, the level 2 index is 511, the level 1 index is 127, and the page offset is 0x5ce](x86_64-page-table-translation-addresses.svg)
With these indices, we can now walk the page table hierarchy to determine the mapped frame for the address: