Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 627
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Figure 11-6.
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63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
Each cache_protection element has the following structure:
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t_d
method
• data_bits
of protection covers. For example, if the cache hardware generates 8 bits of ECC
per 64 bits of data, data_bits would be 64. This field is only valid if t_d is 0, 2, or 3.
• tagprot_lsb
that this protection method covers. This field is only valid if t_d is 1, 2, or 3.
• tagprot_msb
that this protection method covers. This field is only valid if t_d is 1, 2, or 3.
• prot_bits
for the field specified by the t_d element.
• method
Table 11-72. method Values
Value
0
no ECC or parity protection
1
odd parity protection
2
even parity protection
3
ECC protection
All other values of method are reserved.
• t_d
–
data, or both. If over both, the tag and data unit could be concatenated with the
tag either to the left (more significant) or to the right (less significant) than a unit
of data. For the values of 2 and 3, the difference of tagprot_msb and tagprot_lsb
indicates the number of tag bits that are protected with the data bits. The data bits
are described by the data_bits field below. This field is encoded as follows:
Table 11-73. t_d Values
Value
0
Data protection
1
Tag protection
2
Tag+data protection (tag is more significant)
3
Data+tag protection (data is more significant)
When obtaining cache information via this call, information for the data cache should be
obtained first, then if the u bit of the config_info_1 parameter is not set, obtain the
information for the instruction cache.
Volume 2, Part 1: Processor Abstraction Layer
config_info_3 Return Value
Figure 11-7.
cache_protection Fields
prot_bits
Unsigned 8-bit integer denoting the number of data bits that each unit
–
Unsigned 6-bit integer denoting the least-significant tag address bit
–
Unsigned 6-bit integer denoting the most-significant tag address bit
–
Unsigned 6-bit integer denoting the number of protection bits generated
–
Unsigned 4-bit integer denoting the protection method, where:
–
Description
2-bit field denoting whether this protection method applies to the tag, the
Description
cache_protection[4]
cache_protection[5]
tagprot_msb
tagprot_lsb
PAL_CACHE_PROT_INFO
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
data_bits
2:379
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