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For non-double exceptions:
OPRE gets set to the PR from the previous code running
OIPE gets set to the IP from the previous code running
PR is set to all 1s
Hardware interrupts will not occur until after the current processing has been finished via `irete`
Any exceptions that occur before `irete` will trigger a double exception instead of the normal one
When returning via irete:
PR is set to OPRE
Execution jumps to OIPE
For a double exception:
OPRDE is set to the PR from the previous code running
OIPDE is set to the IP from the previous code running
PR is set to all 1s
Segmentation is ignored for the double exception handler, flat addressing is used with no protection
If any exceptions occur during execution of the double exception handler:
If this is not the only core active on the system:
Broadcasts a triple fault message
Shuts down
If this is the only core active on the system:
Restarts the system
When returning via iretde:
PR is set to OPRDE
Execution jumps to OIPDE
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