MPAM0_EL1

Holds information to generate MPAM labels for memory requests when executing at EL0. When EL2 is implemented and enabled in the current Security state, 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 information to label memory requests.

If EL2 is implemented and enabled in the current Security state, and the Effective value of HCR_EL2.{E2H, TGE} is not {1, 1}, the MPAM virtualization option is present and MPAMHCR_EL2.EL0_VPMEN == 1, then MPAM PARTIDs in MPAM0_EL1 are virtual and mapped into physical PARTIDs for the current Security state.

Configuration

This register is present only when FEAT_MPAM is implemented. Otherwise, direct accesses to MPAM0_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:48]

PMG_D, bits [47:40]

PMG_I, bits [39:32]

PARTID_D, bits [31:16]

PARTID_I, bits [15:0]

Accessing MPAM0_EL1

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

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

MRS <Xt>, MPAM0_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b1010	0b0101	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EL2Enabled() && MPAM2_EL2.TRAPMPAM0EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else X[t, 64] = MPAM0_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = MPAM0_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = MPAM0_EL1;

MSR MPAM0_EL1, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b000	0b1010	0b0101	0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EL2Enabled() && MPAM2_EL2.TRAPMPAM0EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else MPAM0_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && MPAM3_EL3.TRAPLOWER == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else MPAM0_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then MPAM0_EL1 = X[t, 64];

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																PMG_D								PMG_I
PARTID_D																PARTID_I

MPAM0_EL1, MPAM0 Register (EL1)

Purpose