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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
On uni-processor systems, the simplest solution to achieve mutual exclusion is to disable interrupts during a process's critical section. This will prevent any interrupt service routines from running (effectively preventing a process from being preempted). Although this solution is effective, it leads to many problems.
The detection of a RESET signal causes the processor to enter a system initialization period of six clock cycles, after which it sets the interrupt request disable flag in the status register and loads the program counter with the values stored at the processor initialization vector ($00FFFC – $00FFFD) before commencing execution. [1]
Causes an interrupt when zero. rT, the trap address register Used to store the address of the trip vector. rTT, the dynamic trap address register Used to store the address of the trap vector. rK, the interrupt mask register Used to enable and disable specific interrupts. rQ, the interrupt request register Used to record interrupts as they occur.
FLAGS registers can be moved from or to the stack. This is part of the job of saving and restoring CPU context, against a routine such as an interrupt service routine whose changes to registers should not be seen by the calling code. Here are the relevant instructions: The PUSHF and POPF instructions transfer the 16-bit FLAGS register.
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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With regard to SPARC, the non-maskable interrupt (NMI), despite having the highest priority among interrupts, can be prevented from occurring through the use of an interrupt mask. [1] An NMI is often used when response time is critical or when an interrupt should never be disabled during normal system operation.