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The instruction that is unable to set or read the VM (Virtual Mode) bit is

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in Microprocessor by (39.4k points)
The instruction that is unable to set or read the VM (Virtual Mode) bit is

(a) PUSHF

(b) IRET

(c) POPF

(d) PUSHF and POPF

The question was posed to me in final exam.

I'd like to ask this question from Virtual 8086 Mode, The Coprocessor 80387 in section 32-bit Processors-80386, 80387 and 80486 of Microprocessor

1 Answer

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by (49.2k points)
Right option is (d) PUSHF and POPF

The explanation is: The PUSHF and POPF instructions are unable to set or read the VM (Virtual Mode) bit, as they do not access it. The virtual mode can be entered by using IRET instruction.

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