May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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14-40
THE
x86 MICROPROCESSORS
14.13 | Privileged Instructions
The instructions that affect system data structures can only be executed in the protected
mode and it is also to be ensured that they are used only at the highest privilege level,
i.e., when CPL is zero. These instructions include:
CLTS — Clear Task Switched Flag
HLT — Halt Processor
LGDT — Load GDT Register
LIDT — Load IDT Register
LLDT — Load LDT Register
LMSW — Load Machine Status Word
LTR — Load Task Register
MOV to/from CRn – Move to Control Register n
MOV to/from DRn – Move to Debug Register n
MOV to/from TRn – Move to Test Register n
In fact, all the instructions involving load/store ...
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