MPAM3_EL3, MPAM3 Register (EL3)

The MPAM3_EL3 characteristics are:

Purpose

Holds information to generate MPAM labels for memory requests when executing at EL3.

Configuration

AArch64 System register MPAM3_EL3 bit [63] is architecturally mapped to AArch64 System register MPAM2_EL2[63] when HaveEL(EL2).

AArch64 System register MPAM3_EL3 bit [63] is architecturally mapped to AArch64 System register MPAM1_EL1[63] .

This register is present only when MPAM is implemented. Otherwise, direct accesses to MPAM3_EL3 are UNDEFINED.

Some or all RW fields of this register have defined reset values. These apply only if the PE resets into an Exception level that is using AArch64. Otherwise, RW fields in this register reset to architecturally UNKNOWN values.

Attributes

MPAM3_EL3 is a 64-bit register.

Field descriptions

The MPAM3_EL3 bit assignments are:

MPAMEN, bit [63]

MPAM Enable. MPAM is enabled when MPAMEN == 1. When disabled, all PARTIDs and PMGs are output as their default value in the corresponding ID space.

Values of this field are:

This field is always read/write in MPAM3_EL3.

This field resets to 0.

TRAPLOWER, bit [62]

Trap direct accesses to any MPAM system registers that are not UNDEFINED from all ELn lower than EL3.

On a Cold reset, this field resets to 1.

SDEFLT, bit [61]

When ARMv8.6-MPAM is implemented and MPAMIDR_EL1.HAS_SDEFLT == 1:

SDEFLT overrides the PARTID with the default PARTID when executing in the Secure state.

This field resets to an UNKNOWN value.

Otherwise:

Reserved, RES0.

FORCE_NS, bit [60]

When ARMv8.6-MPAM is implemented and MPAMIDR_EL1.HAS_FORCE_NS == 1:

FORCE_NS forces MPAM_NS to always be 1 in the Secure state.

This field resets to an UNKNOWN value.

Otherwise:

Reserved, RES0.

Bits [59:48]

Reserved, RES0.

PMG_D, bits [47:40]

Performance monitoring group for data accesses.

This field resets to an architecturally UNKNOWN value.

PMG_I, bits [39:32]

Performance monitoring group for instruction accesses.

PARTID_D, bits [31:16]

Partition ID for data accesses, including load and store accesses, made from EL3.

This field resets to an architecturally UNKNOWN value.

PARTID_I, bits [15:0]

Partition ID for instruction accesses made from EL3.

This field resets to an architecturally UNKNOWN value.

if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    return MPAM3_EL3;
              

if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    MPAM3_EL3 = X[t];