The SMIDR_EL1 characteristics are:
Provides additional identification mechanisms for scheduling purposes, for a PE that supports Streaming SVE mode.
This register is present only when FEAT_SME is implemented. Otherwise, direct accesses to SMIDR_EL1 are UNDEFINED.
SMIDR_EL1 is a 64-bit register.
| 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 | Affinity2 | ||||||||||||||||||||||||||||||
| Implementer | Revision | SMPS | SH | RES0 | Affinity | ||||||||||||||||||||||||||
Reserved, RES0.
The most significant 20 bits of the SMCU affinity for this PE, to be used in conjunction with SMIDR_EL1.Affinity.
This field has an IMPLEMENTATION DEFINED value.
Access to this field is RO.
The Implementer code. This field must hold an implementer code that has been assigned by Arm.
The value of this field is an IMPLEMENTATION DEFINED choice of:
| Implementer | Meaning |
|---|---|
| 0x00 |
Reserved for software use. |
| 0x41 |
Arm Limited. |
| 0x42 |
Broadcom Corporation. |
| 0x43 |
Cavium Inc. |
| 0x44 |
Digital Equipment Corporation. |
| 0x46 |
Fujitsu Ltd. |
| 0x49 |
Infineon Technologies AG. |
| 0x4D |
Motorola or Freescale Semiconductor Inc. |
| 0x4E |
NVIDIA Corporation. |
| 0x50 |
Applied Micro Circuits Corporation. |
| 0x51 |
Qualcomm Inc. |
| 0x56 |
Marvell International Ltd. |
| 0x69 |
Intel Corporation. |
| 0xC0 |
Ampere Computing. |
Arm can assign codes that are not published in this manual. All values not assigned by Arm are reserved and must not be used.
It is not required that this value is the same as the value of MIDR_EL1.Implementer.
Access to this field is RO.
Revision number for the Streaming Mode Compute Unit (SMCU).
This field has an IMPLEMENTATION DEFINED value.
Access to this field is RO.
Indicates support for Streaming SVE mode execution priority.
The value of this field is an IMPLEMENTATION DEFINED choice of:
| SMPS | Meaning |
|---|---|
| 0b0 |
Priority control not supported. |
| 0b1 |
Priority control supported. |
Access to this field is RO.
Indicates whether the implementation of Streaming SVE mode in this PE is shared with other PEs.
The value of this field is an IMPLEMENTATION DEFINED choice of:
| SH | Meaning |
|---|---|
| 0b00 |
Refer to SMIDR_EL1.Affinity. |
| 0b01 |
Reserved. |
| 0b10 |
The implementation of Streaming SVE mode is not shared with other PEs. |
| 0b11 |
The implementation of Streaming SVE mode is shared with other PEs. |
Access to this field is RO.
Reserved, RES0.
The least significant 12 bits of the SMCU affinity for this PE.
If the implementation of Streaming SVE mode is shared, then the concatenated value SMIDR_EL1.{Affinity2,Affinity} identifies which shared SMCU is associated with the PE. The 32-bit value associated with each SMCU is unique within the system as a whole.
This field has an IMPLEMENTATION DEFINED value.
Access to this field is RO.
Accesses to this register use the following encodings in the System register encoding space:
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b001 | 0b0000 | 0b0000 | 0b110 |
if PSTATE.EL == EL0 then if IsFeatureImplemented(FEAT_IDST) then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); else UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.TID1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else X[t, 64] = SMIDR_EL1; elsif PSTATE.EL == EL2 then X[t, 64] = SMIDR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = SMIDR_EL1;
26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6
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