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146 AMD Geode™ LX Processors Data Book
CPU Core Register Descriptions
33234H
5.5.2.45 Floating Point Environment Data Pointer (FPENV_DP_MSR)
FPENV_DP_MSR provides access to the floating point (FP) environment data pointer. Software better accesses the float-
ing point environment data using the FLDENV/FSTENV and FSAVE/FRSTOR instructions.
5.5.2.46 Floating Point Environment Opcode Pointer (FPENV_OP_MSR)
FPENV_OP_MSR provides access to the floating point (FP) environment opcode. Software better accesses the floating
point environment opcode using the FLDENV/FSTENV and FRSTOR/FSAVE instructions.
MSR Address 00001373h
Typ e R /W
Reset Value 00000000_00000000h
FPENV_DP_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
DP
FPENV_DP_MSR Bit Descriptions
Bit Name Description
63:32 RSVD Reserved.
31:0 DP Data Pointer. Effective address of memory operand of last FP instruction that may have
caused an FP error.
MSR Address 00001374h
Typ e R /W
Reset Value 00000000_00000000h
FPENV_OP_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 OP
FPENV_OP_MSR Bit Descriptions
Bit Name Description
63:11 RSVD Reserved.
10:0 OP Opcode Pointer. Opcode of last FP instruction executed that may have caused an FP
error.