how to mix 16bits and 32bits code?

[nobody]

I'm writing some boot code. so i want to mix 16bits and 32bits assembling.
it seems diffcult to do this in nasm.
what i want is something like this:

set-16bits-mode:
xor ax,ax

set-32bits-mode:
xor eax,eax

i want both the above instructions generate the same code 33 c0.

[nobody]

sorry , i found the answer myself.

bits 16 / bits 32 can do this job.