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Vol. 3 7-5
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.
• EFLAGS register field — State of the EFAGS register prior to the task switch.
Figure 7-2. 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