This content has not been validated; it was AI-generated following the x86-64 ISA Documentation generation process to maintain high quality. However, as no human has verified this data, errors may exist. If the accuracy of this data is critical, please consult the Intel SDM. The model used to generate this is gemma4:31b

RDPKRU

RDPKRU reads the Protection Key Rights User (PKRU) register into a destination register.

The following table covers what the source and destinations can be.

DO NOT support LOCK

This instruction is only available when the processor supports Protection Keys for Userspace. It is supported in 64-bit mode and compatibility mode.

The instruction is not a privileged instruction; it can be executed in CPL 3. However, if the CR0.WP bit is not set, certain behaviors regarding page protections may vary.

To avoid an #UD (Undefined Opcode) exception, the software MUST ensure that the CPU supports the PKRU feature and that the corresponding feature flag is enabled in the processor. Use CPUID to verify support before execution.