> 1. This relates to the use of the kvm for testing a grub2 iso. How do
> you scroll up and down in the view in the kvm window?
>
pager=1
> 2. How do you do unblocking I/O from stdin? There are ways to do it with
> the select system call but it seems that there are only grub functions
> that are substituted for system calls.
>
grub_checkkey
> 3. How do you call a  standard C library routine or system call to work
> in grub? For example called read().
>
You don't. You're in an inter-OS space and the only functions you have
are the ones you have in your oxygen bottles.

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko