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Control Register 4 (CR4) Extensions 3-19

18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual

Table 3-5D. Instructions that Modify the IF or VIF Flags—Virtual-8086 Mode Interrupt

Extensions (VME)

TYPE PE VM VME PVI IOPL GP(0) IF VIF

CLI 111— 3NoIF ← 0 No Change

CLI 111—< 3 No No Change VIF ← 0

STI 1 1 1 — 3 No IF ← 1 No Change

STI 1 1 1 — < 3

No Change VIF ← 1

PUSHF 1 1 1 — 3 No Pushed Not Pushed

PUSHF 111—< 3 No Not Pushed Pushed into IF

PUSHFD 1 1 1 — 3 No Pushed Pushed

PUSHFD 111—< 3Yes — —

POPF 1 1 1 — 3 No Popped Not Popped

POPF 1 1 1 — < 3 No Not Popped Popped from IF

POPFD 1 1 1 — 3 No Popped Not Popped

POPFD 1 1 1 — < 3Yes — —

IRET from

V86 Mode

1 1 1 — 3 No Popped Not Popped

IRET from

V86 Mode

111—< 3

Not Popped Popped from IF

IRETD from

V86 Mode

1 1 1 — 3 No Popped Not Popped

IRETD from

V86 Mode

111—< 3Yes — —

IRETD from

Protected Mode

111——

Popped Popped

Notes:

1. All Virtual-8086 mode tasks run at CPL = 3.

2. All protected virtual interrupt handlers run at CPL = 0.

3. GP(0) if an attempt is made to set VIF when VIP = 1.

— Not applicable.

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