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The IRR specifies which interrupts are pending acknowledgement, and is typically a symbolic register which can not be directly accessed. The ISR register specifies which interrupts have been acknowledged, but are still waiting for an end of interrupt (EOI). The IMR specifies which interrupts are to be ignored and not acknowledged.
In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore. It typically occurs to signal attention for non-recoverable hardware errors. Some NMIs may be masked, but only by using proprietary methods specific to the particular NMI.
The Interrupt flag (IF) is a flag bit in the CPU's FLAGS register, which determines whether or not the (CPU) will respond immediately to maskable hardware interrupts. [1] If the flag is set to 1 maskable interrupts are enabled. If reset (set to 0) such interrupts will be disabled until
To mask an interrupt is to disable it, so it is deferred [b] or ignored [c] by the processor, while to unmask an interrupt is to enable it. [9] Processors typically have an internal interrupt mask register, [d] which allows selective enabling [2] (and disabling) of hardware interrupts. Each interrupt signal is associated with a bit in the mask ...
Machine Check Mask Extension for Channel Controller o 1 1 Machine Check Mask Extension for Channel Controller 1 2-3 Reserved for channel controllers 2-3 4-7 Unassigned 8 8 Extended Control Mode 9 9 Configuration Control Bit 10-23 Unassigned 24-31 External interrupt masking 24 Timer 25 Interrupt Key 26 Malfunction Alert - CPU 1 (Ext. Sig. 2) 27
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A well-designed and succinct interrupt handler or interrupt service routine (ISR) will not only expeditiously service any event that causes an interrupt, it will do so without interfering in any way with the interrupted foreground task—the ISR must be "transparent" to the interrupted task (although exceptions may apply in specialized cases ...