AMD AMD5K86 - Page 74

AMD~
18524B/O-Mar1996
AMD5J!36 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
1 1
3
No IF f- 0
No
-
Change
CLI 1 1 1
0 No
No
VIFf-O
-
Change
STI
1 1 1 3 No IF f-l
No
-
Change
STI 1
1
1
0 No
No
VIFf-l
-
Change
PUSHF
1 1
1
3 No Pushed
Not
-
Pushed
Not
Pushed
PUSHF 1 1 1
-
0 No
Pushed
into
stack IF
PUSHFD 1 1 1
-
3 No Pushed Pushed
Virtual-8086
Mode
PUSHFD
1 1
1
-
0 Yes
- -
Extensions
POPF 1 1 1 3 No
Popped
Not
(VME)1,2
-
Popped
Not
Popped
POPF 1 1
1
-
0
No
Popped
from
stack IF
POPFD 1 1 1 3 No
Popped
Not
-
Popped
POPFD 1 1 1
-
0 Yes
- -
IF f-
VIFf-
IRETD 1 1 1 3 No
Return Return
-
Stack
Stack
Image Image
IF f-
VIFf-
IRETD 1 1 1 0 No
Return Return
-
Stack
Stack
Image Image
Notes:
I. All Virtual-8086 tasks run at CPL = 3.
2. INTn handlerS and IRETO instructions run at CPL = O. GP(O) if an attempt is made to set VIF when VIP = I.
- Not applicable.
Control Register 4 (CR4) Extensions
3-19