MPAMCFG_PART

MPAMCFG_PART_SEL_s selects a Secure PARTID to configure. MPAMCFG_PART_SEL_ns selects a Non-secure PARTID to configure. MPAMCFG_PART_SEL_rt selects a Root PARTID to configure. MPAMCFG_PART_SEL_rl selects a Realm 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

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

Field descriptions

Bits [31:28]

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:

Bits [23:17]

INTERNAL, bit [16]

Internal PARTID.

If MPAMF_IDR.HAS_PARTID_NRW == 0b1:

INTERNAL	Meaning
0b0	PARTID_SEL is interpreted as a request PARTID and ignored except for use with MPAMCFG_INTPARTID register access.
0b1	PARTID_SEL is interpreted as an internal PARTID and used for access to MPAMCFG control settings except for MPAMCFG_INTPARTID.

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.

When MPAMF_IDR.HAS_PARTID_NRW == 0, access to this field is RAZ/WI.

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 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 only be accessible from the Secure MPAM feature page. MPAMCFG_PART_SEL_ns must only 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:

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				RIS				RES0							INTERNAL	PARTID_SEL

MPAMCFG_PART_SEL, MPAM Partition Configuration Selection Register

Purpose

Configuration

Attributes

Field descriptions

Bits [31:28]

RIS, bits [27:24]
When (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented), MPAMF_IDR.EXT == 1 and MPAMF_IDR.HAS_RIS == 1:

Otherwise:

Bits [23:17]

INTERNAL, bit [16]

PARTID_SEL, bits [15:0]

Accessing MPAMCFG_PART_SEL

MPAMCFG_PART_SEL can be accessed through the memory-mapped interfaces:

MPAMCFG_PART_SEL, MPAM Partition Configuration Selection Register

Purpose

Configuration

Attributes

Field descriptions

Bits [31:28]

RIS, bits [27:24]When (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented), MPAMF_IDR.EXT == 1 and MPAMF_IDR.HAS_RIS == 1:

Otherwise:

Bits [23:17]

INTERNAL, bit [16]

PARTID_SEL, bits [15:0]

Accessing MPAMCFG_PART_SEL

MPAMCFG_PART_SEL can be accessed through the memory-mapped interfaces:

RIS, bits [27:24]
When (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented), MPAMF_IDR.EXT == 1 and MPAMF_IDR.HAS_RIS == 1: