Intel IA-32 - Manual (Page 247)

Vol. 3A 6-5
TASK MANAGEMENT
The processor updates dynamic fields when a task is suspended during a task switch. The
following are dynamic fields:
•
General-purpose register fields — State of the EAX, ECX, EDX, EBX, ESP, EBP, ESI,
and EDI registers prior to the task switch.
•
Segment selector fields — Segment selectors stored in the ES, CS, SS, DS, FS, and GS
registers prior to the task switch.
Figure 6-2. 32-Bit Task-State Segment (TSS)
0 31
100
96
92
88
84
80
76
I/O Map Base Address
15
LDT Segment Selector
GS
FS
DS
SS
CS
72
68
64
60
56
52
48
44
40
36
32
28
24
20
SS2
16
12
8
4
0
SS1
SS0
ESP0
Previous Task Link
ESP1
ESP2
CR3 (PDBR)
T
ES
EDI
ESI
EBP
ESP
EBX
EDX
ECX
EAX
EFLAGS
EIP
Reserved bits. Set to 0.
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved