05-07-2014, 05:10 PM
Explain the operation of IRET instruction.?
In Real Address Mode, iret pops CS, the flags register, and the instruction pointer from the stack and resumes the routine that was interrupted. In Protected Mode, the setting of the nested task flag (NT) determines the action of iret. The IOPL flag register bits are changed when CPL equals 0 and the new flag image is popped from the stack.
iret returns from an interrupt procedure without a task switch if NT equals 0. Returned code must be equally or less privileged than the interrupt routine as indicated CS selector virtualian.ning.com RPL bits popped from the stack virtualian.ning.com. If the returned code is less privileged, iret pops SS and the stack pointer from the stack
In Real Address Mode, iret pops CS, the flags register, and the instruction pointer from the stack and resumes the routine that was interrupted. In Protected Mode, the setting of the nested task flag (NT) determines the action of iret. The IOPL flag register bits are changed when CPL equals 0 and the new flag image is popped from the stack.
iret returns from an interrupt procedure without a task switch if NT equals 0. Returned code must be equally or less privileged than the interrupt routine as indicated CS selector virtualian.ning.com RPL bits popped from the stack virtualian.ning.com. If the returned code is less privileged, iret pops SS and the stack pointer from the stack
0300-9520262
Get solution in 24 hour |cpmputer & internet
mileys81:[SIZE="4"][SIZE="3"]....[/SIZE][/SIZE]