Interrupts which are initiated by an instruction - Software

Q.  Interrupts which are initiated by an instruction are
- Published on 17 Jun 15

a. Internal
b. External
c. Hardware
d. Software

ANSWER: Software
 

    Discussion

  • Nirja Shah   -Posted on 25 Nov 15
    Software interrupt
    - It occurs when an application software terminates or when it requests the operating system for some service.

    - It is same as the hardware interrupt, which occurs at the hardware level.

    - It only communicates with the kernel and indirectly interrupts the central processing unit.

    - They are associated with an interrupt handler, which is actually just a routine that is activated when an interrupt happens.

    - During this interrupt only one bit of information is communicated.

    - It is used to perform an input/output request.

    - This request, in turn, calls kernel routines that actually perform the service.

    - A software interrupt often emulates most of the features of a hardware interrupt.

    - It calls only a specific interrupt vector and saves the accumulators and registers.

    - A software interrupt can also make use of some of the hardware interrupt routines.

    - Similar in functionality to a subroutine call, it is used for different purposes in a device.

    - One notable example is when communicating with the disk controller for reading and writing data to and from a disk.

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