diff options
Diffstat (limited to 'Documentation/arch')
| -rw-r--r-- | Documentation/arch/x86/index.md | 4 |
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 |