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AMD Geode™ LX Processors Data Book 131
CPU Core Register Descriptions
33234H
5.5.2.23 Segment Selector/Flags MSRs
The Segment Selector/Flags MSRs provide access to the segment selector and segment flags parts of a segment register.
The contents of segment registers should be accessed using MOV or SVDC/RSDC.
ES Segment Selector/Flags Register (ES_SEL_MSR)
CS Segment Selector/Flags Register (CS_SEL_MSR)
SS Segment Selector/Flags Register (SS_SEL_MSR)
DS Segment Selector/Flags Register (DS_SEL_MSR)
FS Segment Selector/Flags Register (FS_SEL_MSR)
GS Segment Selector/Flags Register (GS_SEL_MSR)
LDT Segment Selector/Flags Register (LDT_SEL_MSR)
Temp Segment Selector/Flags Register (TM_SEL_MSR)
TSS Segment Selector/Flags Register (TSS_SEL_MSR)
IDT Segment Selector/Flags Register (IDT_SEL_MSR)
GDT Segment Selector/Flags Register (GDT_SEL_MSR)
MSR Address 00001320h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001321h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001322h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001323h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001324h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001325h
Typ e R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001326h
Type R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001327h
Type R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001328h
Type R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 00001329h
Type R /W
Reset Value xxxxxxxx_xxxxxxxxh
MSR Address 0000132Ah
Type R /W
Reset Value xxxxxxxx_xxxxxxxxh
Segment Selector/Flags 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
G
B/D
RSVD
AVL
RSVD P DPL S X
E/C
W/R
A SELECTOR TI RPL
Segment Selector/Flags MSR Bit Descriptions
Bit Name Description
63:32 RSVD Reserved.
31 G Limit Granularity Bit.
30 B/D Stack Address Size / Code Default Size.
29 RSVD Reserved.
28 AVL Available. Bit available for operating system use.
27:24 RSVD Reserved.
23 P Present.
22:21 DPL Descriptor Privilege Level.
20 S Non-System Descriptor.