Just inside my 64-bit x64 EFI boot loader, I print out the contents of the GDT to see how it was initialized by the firmware. I've tried running the boot loader both in QEMU (OVMF) and VMware ESXi. In both cases, the first 5 descriptors after the leading null descriptor look like this:
0x000000000000ffff Note all the leading zeroes: in particular, flags such as D/B and L being clear seem to suggest a GDT that's inappropriate for 64-bit long mode. I've verified by looking at CR* registers and such that the firmware has indeed placed me in IA32e "long mode" with identity paging. This is what I would expect, in light of section 2.3.4 in the UEFI spec. But why does the GDT have all leading 0's? Thanks, Brett S. _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
