ARM Architecture - Exception and Interrupt Model
How would you disable both IRQ and FIQ interrupts at once with a single instruction in ARM assembly?
How would you disable both IRQ and FIQ interrupts at once with a single instruction in ARM assembly?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand disabling both interrupts
ARM supports combined 'if' operand; CPSID if disables both IRQ ('i') and FIQ ('f') interrupts in one instruction.Step 2: Identify the correct single instruction
CPSID if disables both interrupts at once.Final Answer:
CPSID if -> Option BQuick Check:
CPSID if disables IRQ and FIQ [OK]
Quick Trick: CPSID if disables both IRQ and FIQ at once [OK]
Common Mistakes:
- Assuming no combined 'if' operand
- Using CPSIE to disable
- Using separate instructions
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