Maybe someone knows here. How excatly do I make a x64 CPU go from kernel mode to user mode? I've tried my best going through OSDev wiki and searchs. All resources only point to 32bit methods. No 64bit ones.
2 years ago
From what I understand of such devices, x86_64 is backwards compatible with x86 machine code. No promises, but I expect that it's the same for 32 bit and 64 bit. If it doesn't work, I expect that the processor (or processor family) in question has some official documentation that should answer all your questions, in a few thousand pages (intel x86 documentation is about 11k pages long). · 2 years ago