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AMD Geode™ LX Processors Data Book 657
Instruction Set
33234H
Exceptions
#UD If current privilege level is not 0, or the SMM_INST_EN = 0 and if the processor is not in SMM and if the processor
is not in DMM.
Notes
The reg field within the mod r/m byte must be zero for the SVLDT instruction to be recognized.
8.3.4.14 SVTS - Save Task Register and Descriptor
Operation
Description
Write the Task register and descriptor to memory. Below is the format of the descriptor contents in memory..
Flags Affected
None.
Exceptions
#UD If current privilege level is not 0, or the SMM_INST_EN = 0 and if the processor is not in SMM and if the processor
is not in DMM.
Notes
The reg field within the mod r/m byte must be zero for the SVTS instruction to be recognized.
Opcode Instruction Clocks Description
0F 7C SVTS m80 8 Save TS to memory
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
SELECTOR[15:3] TI RPL +8
BASE[31:24] G B
0 V LIMIT[19:16] 1 DPL 1 0 E W A BASE[23:16] +4
BASE[15:0] LIMIT[15:0] +0
IF (CPL<>0 OR (SMM_INST_EN=0 AND SMM=0 AND DMM=0))
#UD;
ELSE
MEM80 <= TS.DESCR;