July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Before the Advent of the APIC
Most IA32-based systems incorporate an Interrupt Controller that receives interrupt requests from IO devices and passes them to the processor (or, in a multiprocessor system, to one or more of the processors). The Interrupt Controller typically consists of one of the following:
In a single processor PC-AT compatible machine, a pair of cascaded 8259A PICs (Programmable Interrupt Controllers). See Figure 61-1 on page 1500.
In a multiprocessor system, an IO APIC module. See Figure 61-5 on page 1506.
Figure 61-5. The Pentium® 4 Eliminated the ...
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