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p-------------.
,
ACCESS
I
TSS
,
,
f+
-
,
RIGHTS
LIMIT
,
, ,
,
,
,
BASE
f+
, ,
, ,
:
31
PROGRAM
0'
,
,
INVISIBLE ,
10
______
------_.
TASK
REGISTER
TR
SELECTOR
~
15
0
Type
~
9:
Available
386
TSS,
Type
~
B.
Busy
386
TSS
31
80386
31
16
0000000000000000
I
ESPO
0000000000000000
I
ESPI
15
BACK
LINK
SSO
\~
4
8
C
10
TSS
BASE
STACKS
FOR
0000000000000000
I
SSI
CPL
0,1,2
ESP2
0000000000000000
I
CR3
EIP
EFLAGS
EAX
ECX
EDX
EBX
ESP
EBP
ESI
EDI
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
SS2
ES
CS
SS
OS
FS
GS
LOT
14
18
lC
20
24
28
2C
30
34
38
3C
40
44
48
4C
50
54
58
5C
60
CURRENT
TASK
STATE
BILMAP
_OFFSET(15:0}
0000000000000000
I'~
AVAILABLE
----
h
SYSTEM
STATUS,
ETC.
r-
IN
386
TSS
31
24
23
16
15 8
63
56
55
48
47
40
95
88
87
80
79
72
h
r-
I/o
PERMISSION
BITMAP
65407
(ONE
BIT
PER
BYTE
I/O
PORT.
BITMAP
MAY
BE
65439
TRUNCATED
USING
TSS
LIMIT.)
65471
I
65503
I
65535
I
7
39
71
0
OEBUG
TRAP
BIT
32
1
'a'LM
64
96
h
65472
65504
"FFH"
OFFSE
T + C
T +
10
OFFSE
OFFSE
T + lFEC
T + lFFO
T + 1 FF4
ET+
lFF8
T + lFFC
OFFSE
OFFSE
OFFS
OFFSE
OFFSE
T +
2000
t
TSS
LlMIT=OF
FSET
+
2000H
386
TSS
DESCRIPTOR
(IN
GOT)
0
SEGMENT
BASE
15
•••
0
SEGMENT
LIMIT
15
•.
0
BASE
31..24
H 1
101
0
11L~~~~
P I
D~L
1
0
1 I
TYjE
I I
BASE
23
.•
16
231630-64
Figure 4-15a. 386 TSS and TSS Registers
48