UPDATED IO MEMORY MANAGEMENT UNIT IDENTITY SETTINGS FOR DMA REMAPPING

摘要

Disclosed is a system and method for updating IOMMU (Input Output Memory Management Unit) tables for remapping DMA (Direct Memory Access) range for a requested bus device when the device is active.

主权项

1. A method of identity map update for an IO memory management unit, said method comprising:
allocating, at a pre-boot component, a memory region, informing bus firmware component of said allocation, and updating a direct memory access remapping table; accessing, at said firmware component, said allocated memory region; reading, at an operating system component, said allocated memory range and updating said IO memory management unit identity map; and providing access to said memory range based on said identity map.