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Vol. 3 6-67
INTERRUPT AND EXCEPTION HANDLING
Interrupts 32 to 255—User Defined Interrupts
Exception Class Not applicable.
Description
Indicates that the processor did one of the following things:
• Executed an INT n instruction where the instruction operand is one of the vector
numbers from 32 through 255.
• Responded to an interrupt request at the INTR pin or from the local APIC when
the interrupt vector number associated with the request is from 32 through 255.
Exception Error Code
Not applicable.
Saved Instruction Pointer
The saved contents of CS and EIP registers point to the instruction that follows the
INT n instruction or instruction following the instruction on which the INTR signal
occurred.
Program State Change
A program-state change does not accompany interrupts generated by the INT n
instruction or the INTR signal. The INT n instruction generates the interrupt within
the instruction stream. When the processor receives an INTR signal, it commits all
state changes for all previous instructions before it responds to the interrupt; so,
program execution can resume upon returning from the interrupt handler.