What is dual mode operation?

Answer:
  • Sharing system resources requires operating system to ensure that an incorrect program cannot cause other programs to execute incorrectly.
  • Provide hardware support to differentiate between at least two modes of operations.
  • user mode - Execution done on behalf of a user.
  • Monitor mode - Execution done on behalf of operating system.
  • Mode bit is added to computer hardware to indicate the current mode : monitor (0) or user (1).
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