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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4MB Pages
The 4MB 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®.
Enabling 4MB page capability is accomplished by setting CR4[PSE] = 1 (PSE = Page Size Extension; see Figure 21-6 on page 497). 4MB page capability is detected by executing a CPUID request type 1. Bit 3 in EDX = 1 indicates that it is supported (see Figure 21-2 on page 491).
The Problem
Assume that a task will be accessing a large buffer in memory and that it is the OS's intention that the processor should follow the same rules of conduct when accessing any location(s) in this buffer. As an example, assume it is a 2MB video frame buffer in memory. ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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