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# DBGAUTHSTATUS_EL1, Debug Authentication Status register

The DBGAUTHSTATUS_EL1 characteristics are:

## Purpose

Provides information about the state of the IMPLEMENTATION DEFINED authentication interface for debug.

## Configuration

External register DBGAUTHSTATUS_EL1 bits [31:0] are architecturally mapped to AArch64 System register DBGAUTHSTATUS_EL1[31:0] .

External register DBGAUTHSTATUS_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGAUTHSTATUS[31:0] .

It is IMPLEMENTATION DEFINED whether DBGAUTHSTATUS_EL1 is implemented in the Core power domain or in the Debug power domain.

If ARMv8.3-DoPD is implemented, this register is in the Core power domain. If ARMv8.3-DoPD is not implemented, this register is in the Debug power domain.

## Attributes

DBGAUTHSTATUS_EL1 is a 32-bit register.

## Field descriptions

The DBGAUTHSTATUS_EL1 bit assignments are:

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 | SNID | SID | NSNID | NSID

#### Bits [31:8]

Reserved, RES0.

#### SNID, bits [7:6]
When ARMv8.4-Debug is implemented:

Secure non-invasive debug.

ExternalSecureNoninvasiveDebugEnabled() == ExternalSecureInvasiveDebugEnabled().

This field has the same value as DBGAUTHSTATUS_EL1.SID.

####
Otherwise:

Secure non-invasive debug.

SNID | Meaning
--- | ---
0b00 | Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 1.
0b10 | Implemented and disabled. ExternalSecureNoninvasiveDebugEnabled() == FALSE.
0b11 | Implemented and enabled. ExternalSecureNoninvasiveDebugEnabled() == TRUE.

All other values are reserved.

#### SID, bits [5:4]

Secure invasive debug.

SID | Meaning
--- | ---
0b00 | Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 1.
0b10 | Implemented and disabled. ExternalSecureInvasiveDebugEnabled() == FALSE.
0b11 | Implemented and enabled. ExternalSecureInvasiveDebugEnabled() == TRUE.

All other values are reserved.

#### NSNID, bits [3:2]
When ARMv8.4-Debug is implemented:

Non-secure non-invasive debug.

NSNID | Meaning
--- | ---
0b00 | Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 0.
0b11 | Implemented and enabled. ExternalNoninvasiveDebugEnabled() == TRUE.

If the Effective value of SCR_EL3.NS is 1, or if EL3 is implemented and EL2 is not implemented, this field reads as 0b11.

All other values are reserved.

####
Otherwise:

Non-secure non-invasive debug.

NSNID | Meaning
--- | ---
0b00 | Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 0.
0b10 | Implemented and disabled. ExternalNoninvasiveDebugEnabled() == FALSE.
0b11 | Implemented and enabled. ExternalNoninvasiveDebugEnabled() == TRUE.

All other values are reserved.

#### NSID, bits [1:0]

Non-secure invasive debug.

NSID | Meaning
--- | ---
0b00 | Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 0.
0b10 | Implemented and disabled. ExternalInvasiveDebugEnabled() == FALSE.
0b11 | Implemented and enabled. ExternalInvasiveDebugEnabled() == TRUE.

All other values are reserved.

## Accessing the DBGAUTHSTATUS_EL1

#### DBGAUTHSTATUS_EL1 can be accessed through the external debug interface:

Component | Offset | Instance
--- | --- | ---
Debug | 0xFB8 | DBGAUTHSTATUS_EL1

This interface is accessible as follows:

- When ARMv8.3-DoPD is not implemented or IsCorePowered() access to this register is RO.
- Otherwise access to this register returns an Error.

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

15/04/2019 16:47; 8c23526ba8a13a72aada4137daf3e3977b49036e

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