question : is the init process of kernel running in kernel space or user space?

Hi all,

In the linux system , kernel is often starting up like this :

bootloader -> start_32() -> start_kernel() -> init()

i would like to ask what is the piority level in this starting procedure? 0 or 3 ? that means, this start up process are running in kernel spaceor user space ? or the level is keep changing ?If it is in kernel space from the very beginning , at which point thesystem is switched into user space ? is it at the time when kernel openthe shell ?


I am new to linux, hope someone can help me here.


Regards,
TOM
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