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Please explain whether we can use semaphore or mutex or spinlock in interrupt context in Linux Kernel?

Semaphore or Mutex cannot be used for interrupt context in Linux Kernel. While spinlocks can be used for locking in interrupt context.

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Tell me which register bank is used if we use the following instructions. SETB PSW.3 A SETB PSW.4 B?	Tell me which registers are used for register indirect addressing mode if data is on-chip?