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AMD-K6 Datasheet(PDF) 42 Page - Advanced Micro Devices |
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AMD-K6 Datasheet(HTML) 42 Page - Advanced Micro Devices |
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42 / 346 page  24 Software Environment Chapter 3 AMD-K6® Processor Data Sheet 20695H/0—March 1998 Preliminary Information Segment Registers The six 16-bit segment registers are used as pointers to areas (segments) of memory. Table 4 lists the segment registers and their functions. Figure 8 shows the format for all six segment registers. Figure 8. Segment Register Segment Usage The operating system determines the type of memory model that is implemented. The segment register usage is determined by the operating system’s memory model. In a Real mode memory model the segment register points to the base address in memory. In a Protected mode memory model the segment register is called a selector and it selects a segment descriptor in a descriptor table. This descriptor contains a pointer to the base of the segment, the limit of the segment, and various protection attributes. For more information on descriptor formats, see “Descriptors and Gates” on page 45. Figure 9 on page 25 shows segment usage for Real mode and Protected mode memory models. Table 4. Segment Registers Segment Register Segment Register Function CS Code segment, where instructions are located DS Data segment, where data is located ES Data segment, where data is located FS Data segment, where data is located GS Data segment, where data is located SS Stack segment 0 15 |
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