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| author | Patrick Rudolph <siro@das-labor.org> | 2020-06-30 20:24:11 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-07-08 07:27:52 +0000 |
| commit | d5321bf2fb6ddbceea21e8b8e38ae89288fcfb1a (patch) | |
| tree | d665f9c317c87e4b8675cf5cdbc7c2a073553998 | |
| parent | 9d69d881e692c8f1851026b701b5095dd86678b8 (diff) | |
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>
| -rw-r--r-- | Documentation/arch/x86/index.md | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/arch/x86/index.md b/Documentation/arch/x86/index.md index 536dea3951..30dcc10e91 100644 --- a/Documentation/arch/x86/index.md +++ b/Documentation/arch/x86/index.md @@ -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 |