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Re:Reversing the Petya ransomware with constraint solvers by commentereleven on Sunday April 24, 2016 @11:08AM (#11559891)
I think you're talking about unreal mode.

http://wiki.osdev.org/Unreal_Mode

Re:Reversing the Petya ransomware with constraint solvers by a1k0n on Monday April 25, 2016 @07:53PM (#11568332)
That's right, I was, but on further reflection you don't need to do anything special in this case since it's just doing 32 bit math, not 32 bit addressing. EAX/EBX/etc should just work in real mode IIRC.