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So I'm going to switch to CPL to (try to) protect the kernel from applications. The INT operating concerns me, however. How do I prevent users from firing, say INT 32 which happens to be my timer interrupt and throwing off the system time? I tried to find a source on this but I'm pretty puzzled!
In the IDT, you can provide the privilege level required to call the interrupt as a software interrupt. Look at the IDT descriptor information in the Intel Manuals which should tell you where that information is stored.
"Certainly avoid yourself. He is a newbie and might not realize it. You'll hate his code deeply a few years down the road." - Sortie
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