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Vol. 3   9-3
PROCESSOR MANAGEMENT AND INITIALIZATION
CR2, CR3, CR4
00000000H
00000000H
00000000H
CS
Selector = F000H 
Base = FFFF0000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
Selector = F000H 
Base = FFFF0000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
Selector = F000H 
Base = FFFF0000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
SS, DS, ES, FS, GS
Selector = 0000H 
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
Selector = 0000H 
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
Selector = 0000H 
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W, 
Accessed
EDX
00000FxxH  
000n06xxH
3
 000005xxH 
EAX
0
4
0
4
0
4
EBX, ECX, ESI, EDI, 
EBP, ESP
00000000H
00000000H
00000000H
ST0 through ST7
5
Pwr up or Reset: +0.0 
FINIT/FNINIT: Unchanged
Pwr up or Reset: +0.0 
FINIT/FNINIT: Unchanged
Pwr up or Reset: +0.0 
FINIT/FNINIT: Unchanged
x87 FPU Control 
Word
5
Pwr up or Reset: 0040H 
FINIT/FNINIT: 037FH
Pwr up or Reset: 0040H 
FINIT/FNINIT: 037FH
Pwr up or Reset: 0040H 
FINIT/FNINIT: 037FH
x87 FPU Status 
Word
5
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
x87 FPU Tag 
Word
5
Pwr up or Reset: 5555H 
FINIT/FNINIT: FFFFH
Pwr up or Reset: 5555H 
FINIT/FNINIT: FFFFH
Pwr up or Reset: 5555H 
FINIT/FNINIT: FFFFH
x87 FPU Data 
Operand and CS 
Seg. Selectors
5
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
Pwr up or Reset: 0000H 
FINIT/FNINIT: 0000H
x87 FPU Data 
Operand and Inst. 
Pointers
5
Pwr up or Reset:  
   00000000H 
FINIT/FNINIT: 00000000H
Pwr up or Reset:  
   00000000H 
FINIT/FNINIT: 00000000H
Pwr up or Reset:  
   00000000H 
FINIT/FNINIT: 00000000H
MM0 through 
MM7
5
Pwr up or Reset: 
   0000000000000000H 
INIT or FINIT/FNINIT: 
   Unchanged
Pentium II and Pentium III 
Processors Only—
Pwr up or Reset: 
   0000000000000000H 
INIT or FINIT/FNINIT: 
   Unchanged
Pentium with MMX 
Technology Only—
Pwr up or Reset: 
   0000000000000000H 
INIT or FINIT/FNINIT: 
   Unchanged
XMM0 through 
XMM7
Pwr up or Reset: 
   0000000000000000H 
INIT: Unchanged
Pentium III processor Only—
Pwr up or Reset: 
   0000000000000000H 
INIT: Unchanged
NA
MXCSR
Pwr up or Reset: 1F80H 
INIT: Unchanged
Pentium III processor only-
Pwr up or Reset: 1F80H 
INIT: Unchanged
NA
GDTR, IDTR
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W
Base = 00000000H 
Limit = FFFFH 
AR = Present, R/W
Table 9-1.  IA-32 Processor States Following Power-up, Reset, or INIT  (Contd.)
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Pentium 4 and Intel 
Xeon Processor
P6 Family Processor
Pentium Processor