IA-32 architecture
control registers


 
control registers CR0..7
 
reg. 3
1		 3
0		 2
9		 2
8		 2
7		 2
6		 2
5		 2
4		 2
3		 2
2		 2
1		 2
0		 1
9		 1
8		 1
7		 1
6		 1
5		 1
4		 1
3		 1
2		 1
1		 1
0		 9 8 7 6 5 4 3 2 1 0
MSW  
reserved
 		 N
E		 E
T		 T
S		 E
M		 M
P		 P
E
CR0 P
G		 C
D		 N
W		  
reserved
 		 A
M		 r. W
P		  
reserved
 		 N
E		 E
T		 T
S		 E
M		 M
P		 P
E
CR1  
reserved
 
CR2  
page fault virtual address
 
CR3 page directory base reserved P
C
D		 P
W
T		 res.
page directory pointer table base (if CR4.PAE=1)
CR4  
reserved
 		 OS
X
SA
VE		  
res.
 		 S
M
X
E		 V
M
X
E		  
res.
 		 OS
XM
EX		 OS
FX
SR		 P
C
E		 P
G
E		 M
C
E		 P
A
E		 P
S
E		 D
E		 T
S
D		 P
V
I		 V
M
E
CR5  
reserved
 
CR6  
reserved
 
CR7  
reserved
 


 
extended control register XCR0
 
name 6
3		 6
2		 6
1		 6
0		 5
9		 5
8		 5
7		 5
6		 5
5		 5
4		 5
3		 5
2		 5
1		 5
0		 4
9		 4
8		 4
7		 4
6		 4
5		 4
4		 4
3		 4
2		 4
1		 4
0		 3
9		 3
8		 3
7		 3
6		 3
5		 3
4		 3
3		 3
2
3
1		 3
0		 2
9		 2
8		 2
7		 2
6		 2
5		 2
4		 2
3		 2
2		 2
1		 2
0		 1
9		 1
8		 1
7		 1
6		 1
5		 1
4		 1
3		 1
2		 1
1		 1
0		 9 8 7 6 5 4 3 2 1 0
 
XCR0
 		 r
e
s		 reserved
reserved Y
M
M		 S
S
E		 X
8
7


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