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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Protected Mode Virtual Interrupts
The PVI feature was first implemented in the Pentium® processor. It was migrated backwards into the later versions of the 486 and is present in all IA32 processor subsequent to the Pentium®.
Refer to Figure 21-6 on page 497. With CR4[PVI] = 1 (PVI = Protected Mode Virtual Interrupt), if a Protected Mode application program (i.e., with a CPL of 3) attempts the execution of a CLI or an STI instruction it is handled in the same manner as a VM86 task if CR4[VME] = 1 (see “CLI Handling” on page 492 and “STI Handling” on page 495).
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