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-rw-r--r--Documentation/arch/x86/index.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/arch/x86/index.md b/Documentation/arch/x86/index.md
index 81eb51925a..7b9e1fcfa0 100644
--- a/Documentation/arch/x86/index.md
+++ b/Documentation/arch/x86/index.md
@@ -15,6 +15,8 @@ In order to add support for x86_64 the following assumptions are made:
* The high dword of pointers is always zero
* The reference implementation is qemu
* The CPU supports 1GiB hugepages
+* x86 payloads are loaded below 4GiB in physical memory and are jumped
+ to in *protected mode*
## Assuptions for all stages using the reference implementation
* 0-4GiB are identity mapped using 2MiB-pages as WB
@@ -47,7 +49,7 @@ At the moment *$n* is 4, which results in identity mapping the lower 4 GiB.
* Add assembly code for long mode - *DONE*
* Add assembly code for SMM - *DONE*
* Add assembly code for postcar stage - *DONE*
-* Add assembly code to return to protected mode - *TODO*
+* Add assembly code to return to protected mode - *DONE*
* Implement reference code for mainboard `emulation/qemu-q35` - *TODO*
## Future work