MPAMCFG_INTPARTID, MPAM Internal PARTID Narrowing Configuration Register

The MPAMCFG_INTPARTID characteristics are:

Purpose

MPAMCFG_INTPARTID is a 32-bit read-write register that controls the mapping of the PARTID selected by MPAMCFG_PART_SEL into a narrower internal PARTID (intPARTID).

MPAMCFG_INTPARTID_s controls the mapping for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. MPAMCFG_INTPARTID_ns controls the mapping for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL.

The MPAMCFG_INTPARTID register associates the request PARTID (reqPARTID) in the MPAMCFG_PART_SEL register with an internal PARTID (intPARTID) in this register. To set that association, store reqPARTID into the MPAMCFG_PART_SEL register and then store the intPARTID into the MPAMCFG_INTPARTID register. To read the association, store reqPARTID into the MPAMCFG_PART_SEL register and then read MPAMCFG_INTPARTID.

If the intPARTID stored into MPAMCFG_INTPARTID is out-of-range or does not have the INTERNAL bit set, the association of reqPARTID to intPARTID is not written and MPAMF_ESR is set to indicate an intPARTID_Range error.

If MPAMCFG_PART_SEL.INTERNAL is 1 when MPAMCFG_INTPARTID is read or written, MPAMF_ESR is set to indicate an Unexpected_INTERNAL error.

Configuration

The power domain of MPAMCFG_INTPARTID is IMPLEMENTATION DEFINED.

This register is present only when FEAT_MPAM is implemented and MPAMF_IDR.HAS_PARTID_NRW == 1. Otherwise, direct accesses to MPAMCFG_INTPARTID are RES0.

Attributes

MPAMCFG_INTPARTID is a 32-bit register.

Field descriptions

The MPAMCFG_INTPARTID bit assignments are:

Bits [31:17]

Reserved, RES0.

INTERNAL, bit [16]

Internal PARTID flag.

This bit must be 1 when written to the register. If written as 0, the write will not update the reqPARTID to intPARTID association.

On a read of this register, the bit will always read the value last written.

INTPARTID, bits [15:0]

This field contains the intPARTID mapped to the reqPARTID in MPAMCFG_PART_SEL.

The maximum intPARTID supported is MPAMF_PARTID_NRW_IDR.INTPARTID_MAX.

Accessing the MPAMCFG_INTPARTID

This register is within the MPAM feature page memory frames. In a system that supports Secure and Non-secure memory maps, there must be both Secure and Non-secure MPAM feature pages.

MPAMCFG_INTPARTID_s must be accessible from the Secure MPAM feature page. MPAMCFG_INTPARTID_ns must be accessible from the Non-secure MPAM feature page.

MPAMCFG_INTPARTID_s and MPAMCFG_INTPARTID_ns must be separate registers. The Secure instance (MPAMCFG_INTPARTID_s) accesses the PARTID narrowing used for Secure PARTIDs, and the Non-secure instance (MPAMCFG_INTPARTID_ns) accesses the PARTID narrowing used for Non-secure PARTIDs.

When RIS is implemented, loads and stores to MPAMCFG_INTPARTID access the PARTID narrowing configuration settings without being affected by MPAMCFG_PART_SEL.RIS.

Loads and stores to MPAMCFG_INTPARTID access the PARTID narrowing configuration settings for the request PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 0.

MPAMCFG_INTPARTID can be accessed through the memory-mapped interfaces:

Accesses on this interface are RW.

Accesses on this interface are RW.