TABLE
OF
CONTENTS
Page
Software Initiated Interrupts .......................................................................................... 9-3
Interrupt Gates and Trap Gates ..................................................................................... 9-3
Task Gates and Interrupt Tasks .................................................................................... 9-7
Scheduling Considerations ........... ...... ......... ...................................... ..... ............ ........ 9-8
Deciding Between Task, Trap, and Interrupt Gates ................................ .................. 9-8
Protection Exceptions
and
Reserved Vectors .............................................................. 9-9
Invalid OP-Code (Interrupt
6)
...................................................................................... 9-10
Double Fault (Interrupt
8)
............................................................................................ 9-10
Processor Extension Segment Overrun (Interrupt
9)
................................................ 9-10
Invalid Task State Segment (Interrupt 1
0)
.................................................................
9-11
Not Present (Interrupt 11) ...........................................................................................
9-11
Stack Fault (Interrupt 12) ............................................................................................ 9-12
General Protection Fault (Interrupt 13) ...................................................................... 9-13
Additional Exceptions
and
Interrupts ............................................................................ 9-13
Single Step Interrupt (Interrupt 1) .............................................................................. 9-14
CHAPTER
10
SYSTEM CONTROL AND INITIALIZATION
System Flags and Registers .... .......... ......... ......... ................ ...... ...................... ..... .......
10-1
Descriptor Table Registers .......................................................................................
10-1
System Control Instructions ........................................................................................ 10-3
Machine Status Word ............................................................................................... 10-4
Other Instructions .................................................. ................................................... 10-5
Privileged and Trusted Instructions ............................................................................. 10-5
Initialization ................................................................................................................... 10-6
Real Address Mode .................................................................................................. 10-7
Protected Mode ........................................................................................................ 10-7
CHAPTER 11
ADVANCED TOPICS
Virtual Memory Management . ........ ..................... ..... ........................................... .........
11-1
Special Segment Attributes ...................................
...
....................................................
11-1
Conforming Code Segments ....................................................................................
11-1
Expand-Down Data Segments ........ .......... ................. .......... ............................ .....
...
11-2
Pointer Validation ......................................................................................................... 11-3
Descriptor Validation ..................................................................... ........................... 11-4
Pointer Integrity: RPL and the "Trojan Horse Problem" ........................................ 11-4
NPX Context Switching ................................................................................................ 11-5
Multiprocessor Considerations ............................................................. ....................... 11-5
Shutdown ............................................................................................. ;........................ 11-7
APPENDIX A
80286
SYSTEM INITIALIZATION
APPENDIX B
THE
80286
INSTRUCTION SET
APPENDIX C
8086/8088
COMPATIBILITY CONSIDERATIONS
APPENDIX D
80286/80386
SOFTWARE COMPATIBILITY CONSIDERATIONS
INDEX
viii
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