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(nasm.info)Chapter 9

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Chapter 9: Mixing 16 and 32 Bit Code
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   This chapter tries to cover some of the issues, largely related to
unusual forms of addressing and jump instructions, encountered when
writing operating system code such as protected-mode initialisation
routines, which require code that operates in mixed segment sizes, such
as code in a 16-bit segment trying to modify data in a 32-bit one, or
jumps between different- size segments.

Section 9.1

Mixed-Size Jumps

Section 9.2

Addressing Between Different-Size Segments

Section 9.3

Other Mixed-Size Instructions