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OIPH (Old Instruction Pointer [Hardware])
Used to store the old IP when hardware interrupts occur
OPRH (Old Privilege Register [Hardware])
Used to store the old PR when hardware interrupts occur
OIPE (Old Instruction Pointer [Exception])
Used to store the old IP when (non-double) exceptions occur
OPRE (Old Privilege Register [Exception])
Used to store the old PR when (non-double) exceptions occur
OIPDE (Old Instruction Pointer [Double Exception])
Used to store the old IP when double exceptions occur
OPRDE (Old Privilege Register [Double Exception])
Used to store the old PR when double exceptions occur
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