Table of Contents
What is the purpose of interrupt mask?
A central processing unit (CPU) feature that allows the computer to ignore (mask) an interrupt request until the mask bit is disabled.
What is masking and unmasking of interrupts?
1. Maskable interrupt is a hardware Interrupt that can be disabled or ignored by the instructions of CPU. A non-maskable interrupt is a hardware interrupt that cannot be disabled or ignored by the instructions of CPU.
What is the purpose of an interrupt handler?
The job of the interrupt handler is to service the device and stop it from interrupting. Once the handler returns, the CPU resumes what it was doing before the interrupt occurred. The Solaris 7 DDI/DKI provides a bus-architecture independent interface for registering and servicing interrupts.
What is masking of interrupt in microprocessor?
In 8085 microprocessor masking of interrupt we can do for four hardware interrupts INTR, RST 5.5, RST 6.5, and RST 7.5. The three RST interrupts can selectively masked by loading the appropriate word in the accumulator and executing SIM instruction. This iscalled software masking.
What happens if interrupt handler goes asleep?
if the handler sleeps, then the system may hang because the system clock interrupt is masked and incapable of scheduling the sleeping process.
How the hardware interrupt of 8085 can be masked or unmasked?
In 8085 microprocessor masking of interrupt we can do for four hardware interrupts INTR, RST 5.5, RST 6.5, and RST 7.5. The interrupts can enabled by the EI instruction. The three RST interrupts can selectively masked by loading the appropriate word in the accumulator and executing SIM instruction.
What is interinterrupt masking and unmasking?
Interrupt masking and unmasking at the GPIO level, assuming interrupt is unmasked at the interrupt controller and CPU level. To recap, to completely unmask an interrupt so the CPU can respond to it when all other conditions for the interrupt are satisfied: The interrupt must be enabled in the peripheral (if applicable).
What is a maskable interrupt?
A maskable interrupt is an interrupt that is not critical to the system. Compare that with a non-maskable interrupt. These tend to be things like power loss which must be handled immediately no matter what. A maskable interrupt may run, or it may not. You can set a flag to allow that interrupt to run, and at other times to be ignored completely.
What happens when you unmask a GPIO interrupt?
Masking an interrupt does not clear or disable the interrupt. If a GPIO interrupt is enabled, active, and masked, unmasking this interrupt causes the GPIO controller device to signal an interrupt request to the processor. A GPIO interrupt mask bit has no effect while the GPIO interrupt is disabled.
What is interrupt masking in kernel trap?
If a level-triggered interrupt from a peripheral device is enabled and active, but the kernel trap handler cannot immediately run the device’s interrupt service routine (ISR) to clear the interrupt, the handler masks the interrupt at the GPIO pin to prevent the pin from repeatedly causing more interrupts.