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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The Data Segments
Selecting and Accessing a Data Segment
The post-286 processors have four data segment registers: DS, ES, FS and GS. They identify up to four separate data segments (in memory) that can be accessed by the currently executing program.
To access data within one of the four data segments, the programmer must first load a 16-bit value into the respective data segment register. In Real Mode, the value in a data segment register specifies the upper 16 bits of the 20 bit memory start address of the data segment. In Protected Mode, the value selects a segment descriptor in either the GDT or LDT. Figure 9-1 on page 160 illustrates the format of a data segment descriptor. The example
mov ax, 4f36 ;load ds register mov ds, ax ; mov al, ...
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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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