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RSLDT in Assembler

RSLDT - Restore LDTR and Descriptor


CPU: Cyrix Cx486S/S2/D/D2/DX/DX2
IBM BL486DX/DX2
TI Potomac

Type of Instruction: System

Instruction: RSLDT sorc


Description:

LDTR [selector,shadow_descriptor] <- sorc

; sorc is register and descriptor structure (see below)



Format or Register and Descriptor Structure:
+00 Limit (15-0)
+02 Base (15-0)
+04 Base (23-16)
+05 AR byte
+06 AR2/Limit (19-16)
+07 Base (31-24)
+08 Selector
Length of structure is 10h



Flags Affected: None

CPU mode: (1) and (2) and (3) and [(4A) or (4B)]


1) CPL=0
2) CCR1.bit1=1 ; SMI enable
3) SMAR size > 0
4A) in SMM
4B) CCR1.bit2=1 ; SMAC is on



++++++++++++++++

Physical Form: RSLDT mem80
COP (Code of Operation) : 0FH 7BH [mm 000 mmm]
Clocks IBM BL486DX: 10
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This is an NSF News item.

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