MPAMCFG_MBW_PBM<n>, MPAM Bandwidth Portion Bitmap Partition Configuration Register, n = 0 - 127

The MPAMCFG_MBW_PBM<n> characteristics are:

Purpose

The MPAMCFG_MBW_PBM<n> register array gives access to the memory bandwidth portion bitmap. Each register in the array is a read/write register that configures whether a PARTID is allowed to allocate bandwidth portions within a range.

The range of portions covered in MPAMCFG_MBW_PBM<n> is from portion <32*n> to portion <32*n +31>.

After setting MPAMCFG_PART_SEL with a PARTID, software writes to one or more of the MPAMCFG_MBW_PBM<n> registers to configure with bandwidth portions the PARTID is allowed to allocate.

The MPAMCFG_MBW_PBM<n> register that contains the bitmap bit corresponding to memory bandwidth portion p has n equal to p[11:5]. The field, P<x> of that MPAMCFG_MBW_PBM<n> register that contains the bitmap bit corresponding to memory bandwidth portion p has <x> equal to p[4:0].

The MPAMCFG_MBW_PBM<n>_s registers control the bandwidth portion bitmap for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. The MPAMCFG_MBW_PBM<n>_ns registers control the bandwidth portion bitmap for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL. The MPAMCFG_MBW_PBM<n>_rt registers control the bandwidth portion bitmap for the Root PARTID selected by the Root instance of MPAMCFG_PART_SEL. The MPAMCFG_MBW_PBM<n>_rl registers control the bandwidth portion bitmap for the Realm PARTID selected by the Realm instance of MPAMCFG_PART_SEL.

If MPAMF_IDR.HAS_RIS is 1, the control settings accessed are those of the resource instance currently selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.

Configuration

The power domain of MPAMCFG_MBW_PBM<n> is IMPLEMENTATION DEFINED.

This register is present only when FEAT_MPAM is implemented, MPAMF_IDR.HAS_MBW_PART == 1 and MPAMF_MBW_IDR.HAS_PBM == 1. Otherwise, direct accesses to MPAMCFG_MBW_PBM<n> are RES0.

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

Attributes

MPAMCFG_MBW_PBM<n> is a 32-bit register.

Field descriptions

P<x>, bit [x], for x = 31 to 0

Accessing MPAMCFG_MBW_PBM<n>

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:

• MPAMCFG_MBW_PBM<n>_s must only be accessible from the Secure MPAM feature page.
• MPAMCFG_MBW_PBM<n>_ns must only be accessible from the Non-secure MPAM feature page.
• MPAMCFG_MBW_PBM<n>_rt must only be accessible from the Root MPAM feature page.
• MPAMCFG_MBW_PBM<n>_rl must only be accessible from the Realm MPAM feature page.

MPAMCFG_MBW_PBM<n>_s, MPAMCFG_MBW_PBM<n>_ns, MPAMCFG_MBW_PBM<n>_rt, and MPAMCFG_MBW_PBM<n>_rl must be separate registers:

• The Secure instance (MPAMCFG_MBW_PBM<n>_s) accesses the memory bandwidth portion bitmap used for Secure PARTIDs.
• The Non-secure instance (MPAMCFG_MBW_PBM<n>_ns) accesses the memory bandwidth portion bitmap used for Non-secure PARTIDs.
• The Root instance (MPAMCFG_MBW_PBM<n>_rt) accesses the memory bandwidth portion bitmap used for Root PARTIDs.
• The Realm instance (MPAMCFG_MBW_PBM<n>_rl) accesses the memory bandwidth portion bitmap used for Realm PARTIDs.

When RIS is implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the bandwidth resource instance selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.

When RIS is not implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.

When PARTID narrowing is implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the internal PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 1.

When PARTID narrowing is not implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the request PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 0.

MPAMCFG_MBW_PBM<n> can be accessed through the memory-mapped interfaces:

Accesses on this interface are RW.

Accesses on this interface are RW.

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

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

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6

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