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PMVCIDSR: CONTEXTIDR_EL1 and VMID Sample Register

Purpose

Contains the sampled CONTEXTIDR_EL1 and VMID values that are captured on reading PMU.PMPCSR.

Configuration

This register is present only when FEAT_PMUv3_EXT64 is implemented and FEAT_PCSRv8p2 is implemented. Otherwise, direct accesses to PMVCIDSR are RES0.

If FEAT_PMUv3_EXT32 is implemented, the same content is present in the same location, and can be accessed using PMVIDSR[31:0] and PMCID1SR[31:0].

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

PMVCIDSR is a 64-bit register.

This register is part of the PMU block.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
RES0VMID[15:8]VMID
CONTEXTIDR_EL1

Bits [63:48]

Reserved, RES0.

VMID[15:8], bits [47:40]

When FEAT_VMID16 is implemented:

Extension to VMID[7:0]. For more information, see VMID[7:0].

The reset behavior of this field is:



Otherwise:

Reserved, RES0.

VMID, bits [39:32]

VMID sample. The VMID associated with the most recent PMU.PMPCSR sample. When the most recent PMU.PMPCSR sample was generated:

Because the value written to PMVIDSR is an indirect read of the VMID value, it is CONSTRAINED UNPREDICTABLE whether PMVIDSR is set to the original or new value if PMU.PMPCSR samples:

The reset behavior of this field is:

CONTEXTIDR_EL1, bits [31:0]

Context ID. The value of CONTEXTIDR that is associated with the most recent PMU.PMPCSR sample. When the most recent PMU.PMPCSR sample is generated:

Because the value written to this register is an indirect read of CONTEXTIDR, it is CONSTRAINED UNPREDICTABLE whether this register is set to the original or new value if PMU.PMPCSR samples:

The reset behavior of this field is:

Accessing PMVCIDSR

IMPLEMENTATION DEFINED extensions to external debug might make the value of this register UNKNOWN, see 'Permitted behavior that might make the PC Sample-based profiling registers UNKNOWN'.

Accesses to this register use the following encodings:

Accessible at offset 0x208 from PMU