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PMDEVID, Performance Monitors Device ID register

The PMDEVID characteristics are:

Purpose

Provides information about features of the Performance Monitors implementation.

Configuration

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.

This register is required from Armv8.2 and in any implementation that includes ARMv8.2-PCSample. Otherwise, its location is RES0.

Note

Before Armv8.2, the PC Sample-based Profiling Extension can be implemented in the external debug register space, as indicated by the value of EDDEVID.PCSample.

Attributes

PMDEVID is a 32-bit register.

Field descriptions

The PMDEVID bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0PCSample

Bits [31:4]

Reserved, RES0.

PCSample, bits [3:0]

Indicates the level of PC Sample-based Profiling support using Performance Monitors registers. Permitted values of this field are:

PCSampleMeaning
0b0000

PC Sample-based Profiling Extension is not implemented in the Performance Monitors register space.

0b0001

PC Sample-based Profiling Extension is implemented in the Performance Monitors register space.

All other values are reserved.

ARMv8.2-PCSample implements the functionality identified by the value 0b0001.

Accessing the PMDEVID

PMDEVID can be accessed through the external debug interface:

ComponentOffsetInstance
PMU0xFC8PMDEVID

This interface is accessible as follows:

  • When ARMv8.3-DoPD is not implemented or IsCorePowered() accesses to this register are RO.
  • Otherwise accesses to this register generate an error response.