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cpu/x86/64bit: Generate static page tables from an assembly file

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This removes the need for a tool to generate simple identity pages.
Future patches will link this page table directly into the stages on
some platforms so having an assembly file makes a lot of sense.

This also optimizes the size of the page of each 4K page by placing
the PDPE_table below the PDE.

Change-Id: Ia1e31b701a2584268c85d327bf139953213899e3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63725
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
This commit is contained in:
Arthur Heymans
2022-04-19 20:48:42 +02:00
committed by Felix Held
parent 34f5cd9cb2
commit 597b9e9d71
6 changed files with 48 additions and 181 deletions
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4
Documentation/arch/x86/index.md
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@@ -26,9 +26,7 @@ In order to add support for x86_64 the following assumptions were made:
* A stage can install new page tables in RAM
## Page tables
Page tables are generated by a tool in `util/pgtblgen/pgtblgen`. It writes
the page tables to a file which is then included into the CBFS as file called
`pagetables`.
A `pagetables` cbfs file is generated based on an assembly file.
To generate the static page tables it must know the physical address where to
place the file.