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blog/content/posts/02-entering-longmode/index.md

@@ -246,6 +246,7 @@ Bit(s)                | Name | Meaning
 When we switch to long mode, paging will be activated automatically. The CPU will then try to read the instruction at the following address, but this address is now a virtual address. So we need to do _identity mapping_, i.e. map a physical address to the same virtual address.
 
 The `huge page` bit is now very useful to us. It creates a 2MiB (when used in P2) or even a 1GiB page (when used in P3). So we could map the first _gigabytes_ of the kernel with only one P4 and one P3 table by using 1GiB pages. Unfortunately 1GiB pages are relatively new feature, for example Intel introduced it 2010 in the [Westmere architecture]. Therefore we will use 2MiB pages instead to make our kernel compatible to older computers, too.
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 [Westmere architecture]: https://en.wikipedia.org/wiki/Westmere_(microarchitecture)#Technology
 
 To identity map the first gigabyte of our kernel with 512 2MiB pages, we need one P4, one P3, and one P2 table. Of course we will replace them with finer-grained tables later. But now that we're stuck with assembly, we choose the easiest way.