B1.121 Virtualization Processor ID Register

The VPIDR characteristics are:

Purpose
Holds the value of the Virtualization Processor ID. This is the value returned by Non-secure EL1 reads of MIDR. See Figure B1-50 MIDR bit assignments.
Usage constraints

This register is accessible as follows:

EL0

(NS)

EL0

(S)

EL1

(NS)

EL1

(S)

EL2

EL3

(SCR.NS = 1)

EL3

(SCR.NS = 0)

- - - - RW RW -
Configurations
There are no configuration notes.
Attributes

VPIDR is a 32-bit register.

VPIDR resets to the value of MIDR.

Figure B1-69 VPIDR bit assignments
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VPIDR, [31:0]

MIDR value returned by Non-secure PL1 reads of the MIDR. The MIDR description defines the subdivision of this value. See Figure B1-50 MIDR bit assignments.

To access the VPIDR:

MRC p15,4,<Rt>,c0,c0,0 ; Read VPIDR into Rt
MCR p15,4,<Rt>,c0,c0,0 ; Write Rt to VPIDR

Register access is encoded as follows:

Table B1-100 VPIDR access encoding

coproc opc1 CRn CRm opc2
1111 100 0000 0000 000
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