Writing to kernel address space && KWE UWE bits in PTE

[SaNtosh kuLkarni]

My doubt is when , in a, say 3:1 partition of kernel user space address
space, if a user space application tries to write/access the 1gb portion of
kernel space which it cant, is it because there is not page table entry in
the user space process page table entry or......... is it because of a PTE
 ( page table entry)  entry related to access control set to KWE and a
kernel trap occurs.What events take place when a user land process tries to
write to kernel space address.

-- 
*Regards,
Santosh Kulkarni*
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