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# MPAMF_PARTID_NRW_IDR, MPAM PARTID Narrowing ID register

The MPAMF_PARTID_NRW_IDR characteristics are:

## Purpose

Indicates the largest internal PARTID for this MSC.

MPAMF_PARTID_NRW_IDR_s indicates the largest Secure internal PARTID. MPAMF_PARTID_NRW_IDR_ns indicates the largest Non-secure internal PARTID.

When FEAT_RME is implemented: MPAMF_PARTID_NRW_rt indicates the largest Root internal PARTID. MPAMF_PARTID_NRW_rl indicates the largest Realm internal PARTID.

PARTID narrowing is global to the MSC and does not vary by resource instance.

## Configuration

The power domain of MPAMF_PARTID_NRW_IDR is IMPLEMENTATION DEFINED.

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

The power and reset domain of each MSC component is specific to that component.

## Attributes

MPAMF_PARTID_NRW_IDR is a 32-bit register.

## Field descriptions

31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
RES0 | INTPARTID_MAX

#### Bits [31:16]

Reserved, RES0.

#### INTPARTID_MAX, bits [15:0]

The largest intPARTID supported in this MSC.

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

## Accessing MPAMF_PARTID_NRW_IDR

This register is within the MPAM feature page memory frames. In a system that supports Secure, Non-secure, Root, and Realm memory maps, there must be MPAM feature pages in all four address maps.

MPAMF_PARTID_NRW_IDR is read-only.

MPAMF_PARTID_NRW_IDR must be readable from the Non-secure, Secure, Root, and Realm MPAM feature pages.

MPAMF_PARTID_NRW_IDR is permitted to have the same contents when read from the Secure, Non-secure, Root, and Realm MPAM feature pages unless the register contents are different for the different versions:

- MPAMF_PARTID_NRW_IDR_s is permitted to have either the same or different contents to MPAMF_PARTID_NRW_IDR_ns, MPAMF_PARTID_NRW_IDR_rt, or MPAMF_PARTID_NRW_IDR_rl.
- MPAMF_PARTID_NRW_IDR_ns is permitted to have either the same or different contents to MPAMF_PARTID_NRW_IDR_rt or MPAMF_PARTID_NRW_IDR_rl.
- MPAMF_PARTID_NRW_IDR_rt is permitted to have either the same or different contents to MPAMF_PARTID_NRW_IDR_rl.

There must be separate registers in the Secure (MPAMF_PARTID_NRW_IDR_s), Non-secure (MPAMF_PARTID_NRW_IDR_ns), Root (MPAMF_PARTID_NRW_IDR_rt), and Realm (MPAMF_PARTID_NRW_IDR_rl) MPAM feature pages.

#### MPAMF_PARTID_NRW_IDR can be accessed through the memory-mapped interfaces:

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM | MPAMF_BASE_s | 0x0050 | MPAMF_PARTID_NRW_IDR_s

Accesses on this interface are RO.

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM | MPAMF_BASE_ns | 0x0050 | MPAMF_PARTID_NRW_IDR_ns

Accesses on this interface are RO.

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM | MPAMF_BASE_rt | 0x0050 | MPAMF_PARTID_NRW_IDR_rt

When FEAT_RME is implemented, accesses on this interface are RO.

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM | MPAMF_BASE_rl | 0x0050 | MPAMF_PARTID_NRW_IDR_rl

When FEAT_RME is implemented, accesses on this interface are RO.

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6

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