AMD AMD5K86 - Page 72

AMD~
18524BjO- Mar1996
AMD51J6 Processor Technical Reference Manual
TABLE 3-5. Instructions that Modify the IF or VIF Flags (continued)
Mode TYPE PE VM
VME
PVI IOPL GP(O)
IF
VIF
CLI 1
0 0 0
~CPL
No IF f-- 0
-
CLI 1 0
0 0 <CPL
Yes
No
Change
-
STI 1 0 0 0 ~CPL No IF f-- 1
-
STI 1 0 0 0 <CPL Yes
No
Change
-
PUSHF 1
0 0 0
~CPL No
No
Change
-
PUSHF
1 0 0 0 <CPL No
No
Change
-
286 Protected
Mode
IF f--
POPF 1
0 0 0
~CPL No
Stack
-
Image
POPF 1
0 0 0 <CPL No
No
Change
-
IF f--
IRET
1 0 0
0
~CPL No Stack
-
Image
IF f--
IRET 1
0 0 0 <CPL No Stack
-
Image
Notes:
I. All Virtual-8086 tasks run at CPL = 3.
2. INTn handlers and IRETO instructions run at CPL = o. CP(O) if an attempt is mode to set VIF when VIP = I.
- Not applicable.
Control Register 4 (CR4) Extensions
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