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Documentation: Add TODOs for secure SMM when using x86_64 

Change-Id: I157238f18bc1c2eba0adc0b87caa9adaf3fc5d38
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
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Patrick Rudolph 2020-06-30 20:24:11 +02:00 committed by Patrick Georgi
parent 9d69d881e6
commit d5321bf2fb
1 changed files with 9 additions and 0 deletions
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Documentation/arch/x86/index.md
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@ -49,6 +49,15 @@ At the moment *$n* is 4, which results in identity mapping the lower 4 GiB.
* Add assembly code to return to protected mode - *TODO*
* Implement reference code for mainboard `emulation/qemu-q35` - *TODO*
## Future work
1. Fine grained page tables for SMM:
* Must not have execute and write permissions for the same page.
* Must allow only that TSEG pages can be marked executable
* Must reside in SMRAM
2. Support 64bit PCI BARs above 4GiB
3. Place and run code above 4GiB
## Porting other boards
* Fix compilation errors
* Test how well CAR works with x86_64 and paging