Instruction

Opcode

Parameters

Core Clocks

SVDC

0F 78 [mod sreg3 r/m]

sreg3, mem80

18

Instruction

Opcode

Parameters

Core Clocks

SVLDT

0F 7A [mod 000 r/m]

mem80

18

Instruction

Opcode

Parameters

Core Clocks

SVTS

0F 7C

mem80

18

ST486DX - SMM IMPLEMENTATION

20

2.3.6

SVDC - Save Register and Descriptor

SVDC saves the contents of a segment register/selector and its associated descriptor to memory at

mem80. This instruction can be used on any segment/selector including the Code Segment.

2.3.7

SVLDT - Save LDT and Descriptor

SVLDT saves the Local Descriptor Table Selector and non-programmer visible descriptor informa-

tion at the address location mem80.

2.3.8

SVTS - Save TSR and Descriptor

SVTS saves the Task Register and its associated descriptor to address location mem80.