Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 632

PAL_CACHE_SUMMARY
PAL_CACHE_SUMMARY – Get Cache Hierarchy Summary (4)
Returns summary information about the hierarchy of caches controlled by the
Purpose:
processor.
Static Registers Only
Calling Conv:
Physical and Virtual
Mode:
Not dependent
Buffer:
Arguments:
Argument
index
Reserved
Reserved
Reserved
Returns:
Return Value
status
cache_levels
unique_caches
Reserved
Status:
Status Value
0
-2
-3
Software is expected to call PAL_CACHE_SUMMARY before calling PAL_CACHE_INFO to
Description:
determine the number of times PAL_CACHE_INFO should be called and the amount of
storage that must be allocated to hold all of the information returned by
PAL_CACHE_INFO.
2:384
Description
Index of PAL_CACHE_SUMMARY within the list of PAL procedures.
0
0
0
Description
Return status of the PAL_CACHE_SUMMARY procedure.
Unsigned 64-bit integer denoting the number of levels of cache implemented by the
processor. Strictly, this is the number of levels for which the cache controller is integrated
into the processor (the cache SRAMs may be external to the processor).
Unsigned 64-bit integer denoting the number of unique caches implemented by the
processor. This has a maximum of 2*cache_levels, but may be less if any of the levels in
the cache hierarchy are unified caches or do not have both instruction and data caches.
0
Description
Call completed without error
Invalid argument
Call completed with error
Volume 2, Part 1: Processor Abstraction Layer