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EDAA32PFR, External Debug AArch32 Processor Feature Register

The EDAA32PFR characteristics are:

Purpose

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'.

Configuration

It is IMPLEMENTATION DEFINED whether EDAA32PFR is implemented in the Core power domain or in the Debug power domain.

This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to EDAA32PFR are RES0.

Attributes

EDAA32PFR is a 64-bit register.

Field descriptions

The EDAA32PFR 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
RES0
RES0																EL3				EL2				PMSA				VMSA
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

Bits [63:16]

Reserved, RES0.

EL3, bits [15:12]

AArch32 EL3 Exception level handling. Defined values are:

EL3	Meaning
0b0000	EL3 is not implemented or can be executed in AArch64 state.
0b0001	EL3 can be executed in AArch32 state only.

When the value of EDPFR.EL3 is non-zero, this field must be 0b0000.

All other values are reserved.

Note

EDPFR.{EL1, EL0} indicate whether EL1 and EL0 can only be executed in AArch32 state.

EL2, bits [11:8]

AArch32 EL2 Exception level handling. Defined values are:

EL2	Meaning
0b0000	EL2 is not implemented or can be executed in AArch64 state.
0b0001	EL2 can be executed in AArch32 state only.

When the value of EDPFR.EL2 is non-zero, this field must be 0b0000.

All other values are reserved.

Note

EDPFR.{EL1, EL0} indicate whether EL1 and EL0 can only be executed in AArch32 state.

PMSA, bits [7:4]

Indicates support for a PMSA. Defined values are:

PMSA	Meaning
0b0000	PMSA not supported.
0b0100	Support for an Armv8-R PMSAv8-32.

All other values are reserved. In Armv8-A, the only permitted value is 0b0000.

VMSA, bits [3:0]

Indicates support for a VMSA. When the PMSA field is nonzero, determines support for a VMSA. When the PMSA field is 0b0000, VMSA is supported. Defined values are:

VMSA	Meaning
0b0000	VMSA not supported.