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MultiProcessor Specification
4-18 Version 1.4
4.4.1 System Address Space Mapping Entries
System Address Space Mapping entries define the system addresses that are visible on a particular
bus. Each bus defined in the Base Table can have any number of System Address Space Mapping
entries included in the Extended Table. Thus, individual buses can be configured to support
different address ranges, thereby decreasing the amount of bus traffic on a given bus and increasing
the overall system performance. Each consecutive address range that is usable by the operating
system to access devices on a given bus has a System Address Space Mapping entry. Figure 4-9
shows the format of each entry, and Table 4-14 explains each field. See also Appendix E, for more
information.
31 0374811121516192023
24
2728
31 0374811121516192023
24
2728
00H
04H
08H
0CH
10H
ENTRY LENGTHBUS IDADDRESS TYPE
ADDRESS BASE
ADDRESS LENGTH
ENTRY TYPE
128
Figure 4-9. System Address Space Entry