Re: [ros-dev] [ros-diffs] [ros-arm-bringup] 44841: NMI Support Patch 1: [HAL]: The I/O Permissions Map on a typical Privileged Mode x86 OS is all 0xFF's, so it's quite wasteful to copy-in/out the entire map each single BIOS Call. As an optimization, only save and restore non-0xFF entries. [NTOS]: Define and use constants for different IOPM values, instead of using hardcoded values.