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A non-maskable interrupt (NMI) is a hardware interrupt that cannot be ignored by standard interrupt masking techniques in the system. It is typically used to signal attention for non-recoverable hardware errors. (Some NMIs may be masked, but only by using proprietary methods specific to the particular NMI.) == Overview == An NMI is often used when response time is critical or when an interrupt should never be disabled during normal system operation. Such uses include reporting non-recoverable hardware errors, system debugging and profiling, and handling of special cases like system resets. In modern architectures, NMIs are typically used to handle non-recoverable errors which need immediate attention. Therefore, such interrupts should not be masked in the normal operation of the system. These errors include non-recoverable internal system chipset errors, corruption in system memory such as parity and ECC errors, and data corruption detected on system and peripheral buses. On some systems, an NMI can be triggered by the computer's user through hardware and software debugging interfaces and system reset buttons. Debugging NMIs are typically used to diagnose and fix faulty code. In such cases an NMI is used to execute an interrupt handler that transfers control to a special monitor program. From this program a developer can inspect the machine's memory, and examine the internal state of the program at the instant of its interruption. This also allows computers which appear to be hung to be debugged or diagnosed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Non-maskable interrupt」の詳細全文を読む スポンサード リンク
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