May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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THE 80286 AND 80386 PROCESSORS 539
instruction restores IF to the value in the EFLAGS image on the stack. An interrupt through a
trap gate does not change IF. e fi gure shows the channeling of an interrupt from the IDT to
the interrupt vector. Because descriptors are involved in this sequence, privilege level checking
is done for interrupts as well. e privilege rule that governs interrupt procedures is similar to
that for procedure calls.
15.12.1 | Exceptions
Exceptions are caused by error conditions. For the case of the 8086, we know that a divide
by zero error causes a type 0 interrupt. We can call it an exception. e 80386 has more error ...
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