MPAMCFG_PART_SEL, MPAM Partition Configuration Selection Register

The MPAMCFG_PART_SEL characteristics are:

Purpose

Selects a partition ID to configure. MPAMCFG_PART_SEL_s selects a Secure PARTID to configure. MPAMCFG_PART_SEL_ns selects a Non-secure PARTID to configure.

After setting this register with a PARTID, software (usually a hypervisor) can perform a series of accesses to MPAMCFG registers to configure parameters for MPAM resource controls to use when requests have that PARTID.

Configuration

The power domain of MPAMCFG_PART_SEL is IMPLEMENTATION DEFINED.

This register is present only when FEAT_MPAM is implemented and (MPAMF_IDR.HAS_CCAP_PART == 1, or MPAMF_IDR.HAS_CPOR_PART == 1, or MPAMF_IDR.HAS_MBW_PART == 1, or MPAMF_IDR.HAS_PRI_PART == 1, or MPAMF_IDR.HAS_PARTID_NRW == 1, or (MPAMF_IDR.EXT == 0 and MPAMF_IDR.HAS_IMPL_IDR == 1) or (MPAMF_IDR.EXT == 1, MPAMF_IDR.HAS_IMPL_IDR == 1 and MPAMF_IDR.NO_IMPL_PART == 0)). Otherwise, direct accesses to MPAMCFG_PART_SEL are RES0.

Attributes

MPAMCFG_PART_SEL is a 32-bit register.

Field descriptions

The MPAMCFG_PART_SEL bit assignments are:

Bits [31:28]

Reserved, RES0.

RIS, bits [27:24]

When (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented), MPAMF_IDR.EXT == 1 and MPAMF_IDR.HAS_RIS == 1:

Resource Instance Selector. RIS selects one resource to configure through MPAMCFG registers and describe with MPAMF ID registers.

Otherwise:

Reserved, RES0.

Bits [23:17]

Reserved, RES0.

INTERNAL, bit [16]

Internal PARTID.

If MPAMF_IDR.HAS_PARTID_NRW =0, this field is RAZ/WI.

If MPAMF_IDR.HAS_PARTID_NRW = 1:

If PARTID narrowing is implemented as indicated by MPAMF_IDR.HAS_PARTID_NRW = 1, when accessing other MPAMCFG registers the value of the MPAMCFG_PART_SEL.INTERNAL bit is checked for these conditions:

• When the MPAMCFG_INTPARTID register is read or written, if the value of MPAMCFG_PART_SEL.INTERNAL is not 0, an Unexpected_INTERNAL error is set in MPAMF_ESR.

• When an MPAMCFG register other than MPAMCFG_INTPARTID is read or written, if the value of MPAMCFG_PART_SEL.INTERNAL is not 1, MPAMF_ESR is set to indicate an intPARTID_Range error.

In either error case listed here, the value returned by a read operation is UNPREDICTABLE, and the control settings are not affected by a write.

PARTID_SEL, bits [15:0]

Selects the partition ID to configure.

Reads and writes to other MPAMCFG registers are indexed by PARTID_SEL and by the NS bit used to access MPAMCFG_PART_SEL to access the configuration for a single partition.

Accessing the MPAMCFG_PART_SEL

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_PART_SEL_s must be accessible from the Secure MPAM feature page. MPAMCFG_PART_SEL_ns must be accessible from the Non-secure MPAM feature page.

MPAMCFG_PART_SEL_s and MPAMCFG_PART_SEL_ns must be separate registers. The Secure instance (MPAMCFG_PART_SEL_s) accesses the PARTID selector used for Secure PARTIDs, and the Non-secure instance (MPAMCFG_PART_SEL_ns) accesses the PARTID selector used for Non-secure PARTIDs.

MPAMCFG_PART_SEL can be accessed through the memory-mapped interfaces:

Accesses on this interface are RW.

Accesses on this interface are RW.