Writing an OS kernel in assembly with NASM

I want to know what is the standard way for writing a -simple- kernel to be compiled on NASM?

To get it clearer: I was abl开发者_如何学Pythone to define the code block with all the following ways:

[segment code]
[segment .code]
segment code
segment .code

[section code]
[section .code]
section code
section .code

I need to know what is the standard way to do that, And what is the difference between them...

Thanks

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Your question is answer in the NASM documentation, as stated above.

The truth is.. the sections do not mean verymuch when you load your code. A kernel to be loaded, needs a complete bootloader, and a bootloader has 512b to load GDTr, , enabling A20, entering protected mode, and jumping to _kmain. Checkout OSDev.org for more examples, and information.