+ 1. Be loaded. However this is done, as the first thing we write a RETF
+ instruction to 0000:0000 and CALL FAR it (from 16-bit code), or
+ write a RET instruction to 0x00000000 and CALL it (from 32-bit
+ code), backing up the previous content of course, so that qemu+gdb
+ users can intercept via "b *0".