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authorPatrick Rudolph <siro@das-labor.org>2020-06-30 20:24:11 +0200
committerPatrick Georgi <pgeorgi@google.com>2020-07-08 07:27:52 +0000
commitd5321bf2fb6ddbceea21e8b8e38ae89288fcfb1a (patch)
treed665f9c317c87e4b8675cf5cdbc7c2a073553998 /Documentation/arch
parent9d69d881e692c8f1851026b701b5095dd86678b8 (diff)
downloadcoreboot-d5321bf2fb6ddbceea21e8b8e38ae89288fcfb1a.tar.xz
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>
Diffstat (limited to 'Documentation/arch')
-rw-r--r--Documentation/arch/x86/index.md9
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