ARM Architecture - Exception and Interrupt Model
You want to protect a critical section of code from interrupts in ARM. Which sequence correctly disables interrupts before the section and enables them after?
You want to protect a critical section of code from interrupts in ARM. Which sequence correctly disables interrupts before the section and enables them after?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Disable interrupts before critical section
UseCPSID ito disable interrupts and protect the code.Step 2: Enable interrupts after critical section
UseCPSIE ito re-enable interrupts after the critical code finishes.Final Answer:
CPSID i before, CPSIE i after -> Option AQuick Check:
Disable then enable interrupts around critical code [OK]
Quick Trick: Disable interrupts before, enable after critical code [OK]
Common Mistakes:
- Reversing enable and disable order
- Using unrelated instructions like NOP or MOV
- Not re-enabling interrupts after critical section
Master "Exception and Interrupt Model" in ARM Architecture
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