How do I enable SSE for my freestanding bootable code?

Question

(This question was originally about the CVTSI2SD instruction and the fact that I thought it didn\'t work on the Pentium M CPU, but in fact it\'s because I\'m us

Answer 1

I suggest that you consult Intel's manual when you have such questions.

It's clearly stated in the manual that CVTSI2SD is an SSE2 instruction.