The EDPFR characteristics are:
Provides information about implemented PE features.
For general information about the interpretation of the ID registers, see 'Principles of the ID scheme for fields in ID registers' in the ARMv8 ARM.
It is IMPLEMENTATION DEFINED whether EDPFR is implemented in the Core power domain or in the Debug power domain.
EDPFR is a 64-bit register.
The EDPFR bit assignments are:
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 |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | UNKNOWN | AMU | MPAM | SEL2 | SVE | |||||||||||||||
UNK | GIC | AdvSIMD | FP | EL3 | EL2 | EL1 | EL0 | ||||||||||||||||||||||||
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 |
Reserved, RES0.
Reserved, UNKNOWN.
Activity Monitors Extension. Defined values are:
AMU | Meaning |
---|---|
0b0000 |
Activity Monitors Extension is not implemented. |
0b0001 |
Activity Monitors Extension version 1 is implemented. |
All other values are reserved.
ARMv8.4-AMU implements the functionality identified by the value 0b0001.
In ARMv8.0, ARMv8.1, ARMv8.2, and ARMv8.3, the only permitted value is 0b0000.
From ARMv8.4, the permitted values are 0b0000 and 0b0001.
Reserved, RES0.
MPAM Extension. Defined values are:
MPAM | Meaning |
---|---|
0b0000 |
MPAM is not implemented. |
0b0001 |
MPAM is implemented. |
All other values are reserved.
Reserved, RES0.
Secure EL2. Defined values are:
SEL2 | Meaning |
---|---|
0b0000 |
Secure EL2 is not implemented. |
0b0001 |
Secure EL2 is implemented. |
All other values are reserved.
Reserved, RES0.
Scalable Vector Extension. Defined values are:
SVE | Meaning |
---|---|
0b0000 |
SVE is not implemented. |
0b0001 |
SVE is implemented. |
All other values are reserved.
Reserved, RES0.
When the RAS Extension is implemented, this field is UNKNOWN. Otherwise, this field is RES0.
ARMv8.2 requires the implementation of the RAS Extension.
System register GIC interface support. Defined values are:
GIC | Meaning |
---|---|
0b0000 |
No System register interface to the GIC is supported. |
0b0001 |
System register interface to versions 3.0 and 4.0 of the GIC CPU interface is supported. |
All other values are reserved.
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.GIC.
Advanced SIMD. Defined values are:
AdvSIMD | Meaning |
---|---|
0b0000 |
Advanced SIMD is implemented, including support for the following SISD and SIMD operations:
|
0b0001 |
As for 0b0000, and also includes support for half-precision floating-point arithmetic. |
0b1111 |
Advanced SIMD is not implemented. |
All other values are reserved.
This field must have the same value as the FP field.
The permitted values are:
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.AdvSIMD.
Floating-point. Defined values are:
FP | Meaning |
---|---|
0b0000 |
Floating-point is implemented, and includes support for:
|
0b0001 |
As for 0b0000, and also includes support for half-precision floating-point arithmetic. |
0b1111 |
Floating-point is not implemented. |
All other values are reserved.
This field must have the same value as the AdvSIMD field.
The permitted values are:
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.FP.
AArch64 EL3 Exception level handling. Defined values are:
EL3 | Meaning |
---|---|
0b0000 |
EL3 is not implemented or cannot be executed in AArch64 state. |
0b0001 |
EL3 can be executed in AArch64 state only. |
0b0010 |
EL3 can be executed in either AArch64 or AArch32 state. |
When the value of EDAA32PFR.EL3 is non-zero, this field must be 0b0000.
All other values are reserved.
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.EL3.
AArch64 EL2 Exception level handling. Defined values are:
EL2 | Meaning |
---|---|
0b0000 |
EL2 is not implemented or cannot be executed in AArch64 state. |
0b0001 |
EL2 can be executed in AArch64 state only. |
0b0010 |
EL2 can be executed in either AArch64 or AArch32 state. |
When the value of EDAA32PFR.EL2 is non-zero, this field must be 0b0000.
All other values are reserved.
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.EL2.
AArch64 EL1 Exception level handling. Defined values are:
EL1 | Meaning |
---|---|
0b0000 |
EL1 can be executed in AArch32 state only. |
0b0001 |
EL1 can be executed in AArch64 state only. |
0b0010 |
EL1 can be executed in either AArch64 or AArch32 state. |
All other values are reserved.
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.EL1.
AArch64 EL0 Exception level handling. Defined values are:
EL0 | Meaning |
---|---|
0b0000 |
EL0 can be executed in AArch32 state only. |
0b0001 |
EL0 can be executed in AArch64 state only. |
0b0010 |
EL0 can be executed in either AArch64 or AArch32 state. |
All other values are reserved.
In an ARMv8-A implementation that supports AArch64 state in at least one Exception level, this field returns the value of ID_AA64PFR0_EL1.EL0.
Component | Offset | Instance | Range |
---|---|---|---|
Debug | 0xD20 | EDPFR | 31:0 |
This interface is accessible as follows:
Component | Offset | Instance | Range |
---|---|---|---|
Debug | 0xD24 | EDPFR | 63:32 |
This interface is accessible as follows:
15/10/2018 19:25; 79a37e9f651257790ccdbbdd2c8c3713837d12fb
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