Intel IA-32 User Manual
Page 377
Vol. 3A 9-3
PROCESSOR MANAGEMENT AND INITIALIZATION
Table 9-1. IA-32 Processor States Following Power-up, Reset, or INIT
Register
Pentium 4 and Intel Xeon
Processor
P6 Family Processor
Pentium Processor
EFLAGS
1
00000002H
00000002H
00000002H
EIP
0000FFF0H
0000FFF0H
0000FFF0H
CR0
60000010H
2
60000010H
2
60000010H
2
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