00001371h, 00000000_00000000h, 00001372h – AMD Geode LX [email protected] User Manual
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AMD Geode™ LX Processors Data Book
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CPU Core Register Descriptions
33234H
5.5.2.43 Floating Point Environment Instruction Pointer (FPENV_IP_MSR)
FPENV_IP_MSR provides access to the floating point (FP) environment instruction pointer. Software better accesses the
floating point environment data using the FLDENV/FSTENV and FSAVE/FRSTOR instructions.
5.5.2.44 Floating Point Environment Data Segment (FPENV_DS_MSR)
FPENV_DS_MSR provides access to the floating point (FP) environment data segment. Software better accesses the float-
ing point environment data using the FLDENV/FSTENV and FSAVE/FRSTOR instructions.
MSR Address
00001371h
Type
R/W
Reset Value
00000000_00000000h
FPENV_IP_MSR Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
IP
FPENV_IP_MSR Bit Descriptions
Bit
Name
Description
63:32
RSVD
Reserved.
31:0
IP
Instruction Pointer. Effective address of last FP instruction that may have caused an FP
error.
MSR Address
00001372h
Type
R/W
Reset Value
00000000_00000000h
FPENV_DS_MSR Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RSVD
DS
FPENV_DS_MSR Bit Descriptions
Bit
Name
Description
63:16
RSVD
Reserved.
15:0
DS
Data Segment. Selector of data segment of memory operand of last FP instruction that
may have caused an FP error.