12th Generation Intel® Core™ Processors

Datasheet, Volume 1 of 2

ID 655258
Date 06/15/2023
Document Table of Contents

Devil’s Gate Rock

Devil’s Gate Rock (DGR) is a BIOS hardening technology that splits SMI (System Management Interrupts) handlers into Ring 3 and Ring 0 portions.

Supervisor/user paging on the smaller Ring 0 portion will enforce access policy for all the ring 3 code with regard to the SMM state save, MSR registers, IO ports and other registers.

The Ring 0 portion can perform save/restore of register context to allow the Ring 3 section to make use of those registers without having access to the OS context or the ability to modify the OS context.

The Ring 0 portion is signed and provided by Intel. This portion is attested by the processor.