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AMD Geode™ LX Processors Data Book 145
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
Typ e 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
313029282726252423222120191817161514131211109876543210
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
Typ e 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
313029282726252423222120191817161514131211109876543210
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.