What Is Primask

PRIMASK is a 1-bit-wide interrupt mask register. When set, it blocks all interrupts apart from the non-maskable interrupt (NMI) and the hard fault exception. The PRIMASK prevents activation of all exceptions with configurable priority.

What is Primask register?

The PRIMASK register is a 1-bit wide interrupt mask register. When set, it blocks all exceptions (including interrupts) apart from the Non-Maskable Interrupt (NMI) and the HardFault exception.

What is the Ipsr in arm?

The interrupt program status register (IPSR) contains the exception type number of the current ISR. Bit[31:6] of IPSR are reserved while Bit[5:0] are applied to the current ISR number. The exception master registers disable the handling of exceptions by the processor.