MPAMIDR

Indicates the presence and maximum PARTID and PMG values supported in the implementation. It also indicates whether the implementation supports MPAM virtualization.

Configuration

This register is present only when FEAT_MPAM is implemented. Otherwise, direct accesses to MPAMIDR_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:62]

HAS_SDEFLT, bit [61]

HAS_SDEFLT indicates support for MPAM3_EL3.SDEFLT bit. Defined values are:

HAS_SDEFLT	Meaning
0b0	The SDEFLT bit is not implemented in MPAM3_EL3.
0b1	The SDEFLT bit is implemented in MPAM3_EL3.

When MPAM3_EL3.SDEFLT == 1, accesses from the Secure Execution state use the default PARTID, PARTID == 0.

HAS_FORCE_NS, bit [60]

HAS_FORCE_NS indicates support for MPAM3_EL3.FORCE_NS bit. Defined values are:

HAS_FORCE_NS	Meaning
0b0	The FORCE_NS bit is not implemented in MPAM3_EL3.
0b1	The FORCE_NS bit is implemented in MPAM3_EL3.

When MPAM3_EL3.FORCE_NS == 1, accesses from the Secure Execution state have MPAM_NS == 1.

SP4, bit [59]

Supports 4 MPAM PARTID spaces.

SP4	Meaning
0b0	MPAM supports 2 PARTID spaces.
0b1	MPAM supports 4 PARTID spaces.

HAS_TIDR, bit [58]

HAS_TIDR indicates support for MPAM2_EL2.TIDR bit. Defined values are:

HAS_TIDR	Meaning
0b0	The TIDR bit is not implemented in MPAM2_EL2.
0b1	The TIDR bit is implemented in MPAM2_EL2.

Note

Arm recommends that when the MPAM version is MPAM v0.1 or MPAM v1.1, MPAMIDR_EL1.HAS_TIDR is 1 and that the MPAM2_EL2.TIDR field is implemented.

HAS_ALTSP, bit [57]

HAS_ALTSP indicates support for alternative PARTID spaces.

HAS_ALTSP	Meaning
0b0	Alternative PARTID spaces are not implemented.
0b1	Alternative PARTID spaces are implemented with control bits in MPAM3_EL3 and MPAM2_EL2.

Bits [56:40]

PMG_MAX, bits [39:32]

The largest value of PMG that the implementation can generate. The PMG_I and PMG_D fields of every MPAMn_ELx must implement at least enough bits to represent PMG_MAX.

Bits [31:21]

VPMR_MAX, bits [20:18]
When MPAMIDR_EL1.HAS_HCR == 1:

Otherwise:

HAS_HCR, bit [17]

HAS_HCR indicates that the PE implementation supports MPAM virtualization, including MPAMHCR_EL2, MPAMVPMV_EL2, and MPAMVPM<n>_EL2 with n in the range 0 to VPMR_MAX. Must be 0 if EL2 is not implemented in either Security state.

HAS_HCR	Meaning
0b0	MPAM virtualization is not supported.
0b1	MPAM virtualization is supported.

Bit [16]

PARTID_MAX, bits [15:0]

The largest value of PARTID that the implementation can generate. The PARTID_I and PARTID_D fields of every MPAMn_ELx must implement at least enough bits to represent PARTID_MAX.

Accessing MPAMIDR_EL1

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, MPAMIDR_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b1010	0b0100	0b100

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() && MPAMIDR_EL1.HAS_HCR == '1' && MPAMHCR_EL2.TRAP_MPAMIDR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MPAMIDR_EL1.HAS_TIDR == '1' && MPAM2_EL2.TIDR == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else X[t, 64] = MPAMIDR_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); else X[t, 64] = MPAMIDR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = MPAMIDR_EL1;

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
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		HAS_SDEFLT	HAS_FORCE_NS	SP4	HAS_TIDR	HAS_ALTSP	RES0																	PMG_MAX
RES0											VPMR_MAX			HAS_HCR	RES0	PARTID_MAX

MPAMIDR_EL1, MPAM ID Register (EL1)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:62]

HAS_SDEFLT, bit [61]

HAS_FORCE_NS, bit [60]

SP4, bit [59]

HAS_TIDR, bit [58]

HAS_ALTSP, bit [57]

Bits [56:40]

PMG_MAX, bits [39:32]

Bits [31:21]

VPMR_MAX, bits [20:18]
When MPAMIDR_EL1.HAS_HCR == 1:

Otherwise:

HAS_HCR, bit [17]

Bit [16]

PARTID_MAX, bits [15:0]

Accessing MPAMIDR_EL1

MRS <Xt>, MPAMIDR_EL1

MPAMIDR_EL1, MPAM ID Register (EL1)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:62]

HAS_SDEFLT, bit [61]

HAS_FORCE_NS, bit [60]

SP4, bit [59]

HAS_TIDR, bit [58]

HAS_ALTSP, bit [57]

Bits [56:40]

PMG_MAX, bits [39:32]

Bits [31:21]

VPMR_MAX, bits [20:18]When MPAMIDR_EL1.HAS_HCR == 1:

Otherwise:

HAS_HCR, bit [17]

Bit [16]

PARTID_MAX, bits [15:0]

Accessing MPAMIDR_EL1

MRS <Xt>, MPAMIDR_EL1

VPMR_MAX, bits [20:18]
When MPAMIDR_EL1.HAS_HCR == 1: