https://courses.cs.washington.edu/courses/cse351/12wi/supp-docs/AMD%20Vol%201.pdf
Figure 1-1. Application-Programming Register Set
Table 1-1. Operating Modes
https://courses.cs.washington.edu/courses/cse351/12wi/supp-docs/AMD%20Vol%201.pdf
Figure 1-1. Application-Programming Register Set
Table 1-1. Operating Modes