|Home > Register descriptions > AArch64 system registers > ID_PFR0_EL1, AArch32 Processor Feature Register 0, EL1|
The ID_PFR0_EL1 provides top-level information about the instruction sets supported by the core in AArch32.
ID_PFR0_EL1 is a 32-bit register, and is part of the Identification registers functional group.
This register is Read Only.
RAS extension version. The value is:
Version 1 of the RAS extension is present.
|This device does not disclose whether branch targets trained in one context can affect speculative execution in a different context.|
|Branch targets trained in one context cannot affect speculative execution in a different hardware described context. This is the reset value.|
Indicates support for Thumb Execution Environment (T32EE) instruction set. This value is:
| ||Core does not support the T32EE instruction set.|
Indicates support for Jazelle. This value is:
| ||Core supports trivial implementation of Jazelle.|
Indicates support for T32 instruction set. This value is:
| ||Core supports T32 encoding after the introduction of Thumb-2 technology, and for all 16-bit and 32-bit T32 basic instructions.|
Indicates support for A32 instruction set. This value is:
| ||A32 instruction set implemented.|
Bit fields and details that are not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.