ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

The CPUID Identification Scheme
0b0010 As for 0b0001, and adds:
Clean and invalidate cache line by set/way.
0b0011 As for 0b0010, and adds:
Invalidate cache line by set/way.
If this field is set to a value other than 0b0000 then the L1 Harvard cache s/w field,
bits [11:8], must be set to 0b0000.
L1 Harvard cache s/w, bits [11:8]
Indicates the supported Level 1 cache line maintenance operations by set/way, for a Harvard
cache implementation. Permitted values are:
0b0000 None supported. This is the required setting for ARMv7, because ARMv7
requires a hierarchical cache implementation.
0b0001 Supported Level 1 Harvard cache line maintenance operations by set/way are:
Clean data cache line by set/way
Clean and invalidate data cache line by set/way.
0b0010 As for 0b0001, and adds:
Invalidate data cache line by set/way.
0b0011 As for 0b0010, and adds:
Invalidate instruction cache line by set/way.
If this field is set to a value other than 0b0000 then the L1 unified cache s/w field,
bits [15:12], must be set to 0b0000.
L1 unified cache VA, bits [7:4]
Indicates the supported Level 1 cache line maintenance operations by MVA, for a unified
cache implementation. Permitted values are:
0b0000 None supported. This is the required setting for ARMv7, because ARMv7
requires a hierarchical cache implementation.
0b0001 Supported Level 1 unified cache line maintenance operations by MVA are:
Clean cache line by MVA
Invalidate cache line by MVA
Clean and invalidate cache line by MVA.
0b0010 As for 0b0001, and adds:
Invalidate branch predictor by MVA, if branch predictor is implemented.
If this field is set to a value other than 0b0000 then the L1 Harvard cache VA field, bits [3:0],
must be set to 0b0000.
L1 Harvard cache VA, bits [3:0]
Indicates the supported Level 1 cache line maintenance operations by MVA, for a Harvard
cache implementation. Permitted values are:
0b0000 None supported. This is the required setting for ARMv7, because ARMv7
requires a hierarchical cache implementation.
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