Improve documentation for ARM64 ring0/entry_arm64.s

[hbhasker]

entry_arm64.s has large parts of ARM specific assembly that doesn't have proper documentation. It would be helpful for future maintainers to include references to specific ARM manuals or a better description of each assembly function.

Same goes for lib_arm64.s where functions could use some descriptions w/ references.

[avagin]

Cc: @lubinszARM

[lubinszARM]

I see.
@hbhasker I will sort out the documents related to GOASM and ARM in these files.
Thanks.

[lubinszARM]

Hi @hbhasker
Can tell me your email?
Let me send you some files related to GOASM and ARM spec?
Thanks.

[avagin]

@lubinszARM you can share them here. I think it will be interesting for others too. And you can find bhasker's email in the git history.

[lubinszARM]

goasm_arm64.zip

[lubinszARM]

Arm Architecture Reference Manual Armv8, for Armv8-A architecture profile
https://developer.arm.com/documentation/ddi0487/latest/

[lubinszARM]

Please take a look, if have any other questions, please let me know.
:)

[github-actions]

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