SMPRIMAP

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SMPRIMAP_EL2, Streaming Mode Priority Mapping Register

Purpose

Maps the value in SMPRI_EL1 to a streaming execution priority value for instructions executed at EL1 and EL0 in the same Security states as EL2.

Configuration

This register is present only when FEAT_SME is implemented and FEAT_AA64 is implemented. Otherwise, direct accesses to SMPRIMAP_EL2 are UNDEFINED.

Attributes

Field descriptions

When all of the following are true, the value in SMPRI_EL1 is mapped to a streaming execution priority using this register:

The current Exception level is EL1 or EL0.
EL2 is implemented and enabled in the current Security state.
HCRX_EL2.SMPME is '1'.

Otherwise, SMPRI_EL1 holds the streaming execution priority value.

P15, bits [63:60]

Priority Mapping Entry 15. This entry is used when priority mapping is supported and enabled, and the SMPRI_EL1.Priority value is '15'.

This value is the highest streaming execution priority.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

P14, bits [59:56]

P13, bits [55:52]

P12, bits [51:48]

P11, bits [47:44]

P10, bits [43:40]

P9, bits [39:36]

P8, bits [35:32]

P7, bits [31:28]

P6, bits [27:24]

P5, bits [23:20]

P4, bits [19:16]

P3, bits [15:12]

P2, bits [11:8]

P1, bits [7:4]

P0, bits [3:0]

Priority Mapping Entry 0. This entry is used when priority mapping is supported and enabled, and the SMPRI_EL1.Priority value is '0'.

This value is the lowest streaming execution priority.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing SMPRIMAP_EL2

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

MRS <Xt>, SMPRIMAP_EL2

op0	op1	CRn	CRm	op2
0b11	0b100	0b0001	0b0010	0b101

if !(IsFeatureImplemented(FEAT_SME) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then X{64}(t) = NVMem(0x1F8); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && CPTR_EL3().ESM == '0' then Undefined(); elsif HaveEL(EL3) && CPTR_EL3().ESM == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = SMPRIMAP_EL2(); end; elsif PSTATE.EL == EL3 then if CPTR_EL3().ESM == '0' then AArch64_SystemAccessTrap(EL3, 0x18); else X{64}(t) = SMPRIMAP_EL2(); end; end;

MSR SMPRIMAP_EL2, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b100	0b0001	0b0010	0b101

if !(IsFeatureImplemented(FEAT_SME) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'1x1'} then NVMem(0x1F8) = X{64}(t); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && CPTR_EL3().ESM == '0' then Undefined(); elsif HaveEL(EL3) && CPTR_EL3().ESM == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else SMPRIMAP_EL2() = X{64}(t); end; elsif PSTATE.EL == EL3 then if CPTR_EL3().ESM == '0' then AArch64_SystemAccessTrap(EL3, 0x18); else SMPRIMAP_EL2() = X{64}(t); end; end;

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
P15				P14				P13				P12				P11				P10				P9				P8
P7				P6				P5				P4				P3				P2				P1				P0

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
P15				P14				P13				P12				P11				P10				P9				P8
P7				P6				P5				P4				P3				P2				P1				P0

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
P15				P14				P13				P12				P11				P10				P9				P8
P7				P6				P5				P4				P3				P2				P1				P0