Privilege levels 80386

Computer system security measures prevent ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Privilege protection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

Executing privileged instructions ,[object Object],[object Object],[object Object],[object Object],[object Object]

References to other data ,[object Object],[object Object]

Transferring control to other code ,[object Object]

Defining privilege levels ,[object Object],[object Object],[object Object],[object Object]

Privileged instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A numerically smaller PL means a higher privilege level

Privileged instructions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IOPL sensitive instructions ,[object Object],[object Object],[object Object],[object Object]

Privildged Data References ,[object Object],[object Object]

[object Object],[object Object],[object Object]

GDTR,IDTR,LDTR contains ,[object Object],[object Object]

Segment Selectors ,[object Object],[object Object],[object Object],INDEX RPL TI

80386 segment registers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Loading Segment Selectors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GDT GDT 0 GDT 1 GDT 2 GDTR Offset Index 2 1 0 TI RPL

SEGMENTATION Addressing GDT Prog GDT Main Memory Index 2 1 0 TI RPL GD 0 GD 1 GD 2 GDTR Offset

Addressing GDT GD 0 GD 1 GD 2 Main Memory Base Address Seg Limit Attrib Index 3 2 1 0 TI RPL GDTR Offset

GD 0 GD 1 GD 2 GDTR Index 2 1 0 TI RPL GDT Base Address Seg Limit Attrib + Offset

Local Descriptor Tables(LDT’s) ,[object Object],[object Object],[object Object],[object Object]

Descriptor LDT Descriptor Descriptor Descriptor Data Descriptor Descriptor GDT LDT GDTR LDTR 1 DS ESI

Local Descriptor table ,[object Object],[object Object],[object Object],[object Object],[object Object]

Privilege levels 80386

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Privilege levels 80386