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MPAM1_EL1, MPAM1 Register (EL1)

The MPAM1_EL1 characteristics are:

Purpose

Holds information to generate MPAM labels for memory requests when executing at EL1.

When EL2 is present and enabled, the MPAM virtualization option is present, MPAMHCR_EL2.GSTAPP_PLK == 1 and HCR_EL2.TGE == 0, MPAM1_EL1 is used instead of MPAM0_EL1 to generate MPAM labels for memory requests when executing at EL0.

MPAM1_EL1 is an alias for MPAM2_EL2 when executing at EL2 with HCR_EL2.E2H == 1.

MPAM1_EL12 is an alias for MPAM1_EL1 when executing at EL2 or EL3 with HCR_EL2.E2H == 1.

If EL2 is is present and enabled, the MPAM virtualization option is present and MPAMHCR_EL2.EL1_VPMEN == 1, MPAM PARTIDs in MPAM1_EL1 are virtual and mapped into physical PARTIDs for the current Security state. This mapping of MPAM1_EL1 virtual PARTIDs to physical PARTIDs when EL1_VPMEN is 1 also applies when MPAM1_EL1 is used at EL0 due to MPAMHCR_EL2.GSTAPP_PLK.

Configuration

AArch64 System register MPAM1_EL1 bit [63] is architecturally mapped to AArch64 System register MPAM3_EL3[63] when EL3 is implemented.

AArch64 System register MPAM1_EL1 bit [63] is architecturally mapped to AArch64 System register MPAM2_EL2[63] when EL3 is not implemented and EL2 is implemented.

This register is present only when FEAT_MPAM is implemented. Otherwise, direct accesses to MPAM1_EL1 are UNDEFINED.

Attributes

MPAM1_EL1 is a 64-bit register.

Field descriptions

The MPAM1_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
MPAMENRES0FORCED_NSRES0PMG_DPMG_I
PARTID_DPARTID_I
313029282726252423222120191817161514131211109876543210

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.

MPAMENMeaning
0b0

The default PARTID and default PMG are output in MPAM information.

0b1

MPAM information is output based on the MPAMn_ELx register for ELn according the MPAM configuration.

If neither EL3 nor EL2 is implemented, this field is read/write.

If EL3 is implemented, this field is read-only and reads the current value of the read/write bit MPAM3_EL3.MPAMEN.

If EL3 is not implemented and EL2 is implemented, this field is read-only and reads the current value of the read/write bit MPAM2_EL2.MPAMEN.

This field resets to 0.

Accessing this field has the following behavior:

  • When EL3 is not implemented and EL2 is not implemented, access to this field is RW.
  • Otherwise, access to this field is RO.

Bits [62:61]

Reserved, RES0.

FORCED_NS, bit [60]

When FEAT_MPAMv0p1 is implemented:

In the Secure state, FORCED_NS indicates the state of MPAM3_EL3.FORCE_NS.

FORCED_NSMeaning
0b0

In the Non-secure state, always reads as 0.

In the Secure state, indicates that MPAM3_EL3.FORCE_NS == 0.

0b1

In the Secure state, indicates that MPAM3_EL3.FORCE_NS == 1.

Always reads as 0 in the Non-secure state.

Writes are ignored.

Access to this field is RO.


Otherwise:

Reserved, RES0.

Bits [59:48]

Reserved, RES0.

PMG_D, bits [47:40]

Performance monitoring group property for PARTID_D.

This field resets to an architecturally UNKNOWN value.

PMG_I, bits [39:32]

Performance monitoring group property for PARTID_I.

This field resets to an architecturally UNKNOWN value.

PARTID_D, bits [31:16]

Partition ID for data accesses, including load and store accesses, made from EL1.

This field resets to an architecturally UNKNOWN value.

PARTID_I, bits [15:0]

Partition ID for instruction accesses made from EL1.

This field resets to an architecturally UNKNOWN value.

Accessing the MPAM1_EL1

When HCR_EL2.E2H is 1, without explicit synchronization, accesses from EL3 using the mnemonic MPAM1_EL1 or MPAM1_EL12 are not guaranteed to be ordered with respect to accesses using the other mnemonic.

None of the fields in this register are permitted to be cached in a TLB.

Accesses to this register use the following encodings:

MRS <Xt>, MPAM1_EL1

op0op1CRnCRmop2
0b110b0000b10100b01010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    elsif EL2Enabled() && MPAM2_EL2.TRAPMPAM1EL1 == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then
        return NVMem[0x900];
    else
        return MPAM1_EL1;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    elsif HCR_EL2.E2H == '1' then
        return MPAM2_EL2;
    else
        return MPAM1_EL1;
elsif PSTATE.EL == EL3 then
    return MPAM1_EL1;

MSR MPAM1_EL1, <Xt>

op0op1CRnCRmop2
0b110b0000b10100b01010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    elsif EL2Enabled() && MPAM2_EL2.TRAPMPAM1EL1 == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then
        NVMem[0x900] = X[t];
    else
        MPAM1_EL1 = X[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    elsif HCR_EL2.E2H == '1' then
        MPAM2_EL2 = X[t];
    else
        MPAM1_EL1 = X[t];
elsif PSTATE.EL == EL3 then
    MPAM1_EL1 = X[t];

MRS <Xt>, MPAM1_EL12

op0op1CRnCRmop2
0b110b1010b10100b01010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '101' then
        return NVMem[0x900];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if HCR_EL2.E2H == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            if Halted() && EDSCR.SDD == '1' then
                UNDEFINED;
            else
                AArch64.SystemAccessTrap(EL3, 0x18);
        else
            return MPAM1_EL1;
    else
        UNDEFINED;
elsif PSTATE.EL == EL3 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' then
        return MPAM1_EL1;
    else
        UNDEFINED;

MSR MPAM1_EL12, <Xt>

op0op1CRnCRmop2
0b110b1010b10100b01010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '101' then
        NVMem[0x900] = X[t];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            AArch64.SystemAccessTrap(EL3, 0x18);
        else
            AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if HCR_EL2.E2H == '1' then
        if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then
            if Halted() && EDSCR.SDD == '1' then
                UNDEFINED;
            else
                AArch64.SystemAccessTrap(EL3, 0x18);
        else
            MPAM1_EL1 = X[t];
    else
        UNDEFINED;
elsif PSTATE.EL == EL3 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' then
        MPAM1_EL1 = X[t];
    else
        UNDEFINED;


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