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CHI LPID assignment

CHI TXREQ transactions include the Logical Processor ID (LPID) field. This field uniquely identifies the logical core that generated the request transaction.

The processor uses the following LPID values:

0b000Core 0 request.
0b001Core 1 request.
0b010Core 2 request.
0b011Core 3 request.
0b100ACP request.
0b111L2 hardware flush request.

Secondary transactions such as copybacks from the L2, because of cache fills caused by core or ACP access L2 misses, use the LPID of the request that caused the copyback.