x86: Uncacheable Memory Access Support

This system performance enhancement is new in the Solaris Express 6/06 release.

On x86 and AMD64 architectures, modern graphics controller cards, such as NVIDIA or AGP require a mechanism to access uncacheable memory to enhance performance. The uncacheable memory access enables these graphic controller cards to keep coherency on the system with performance gain.

The uncacheable memory access support feature provides this functionality by using the ddi interfaces.

The following memory type are supported:

• Uncacheable (UC)

• Write-combining (WC)

For more information, see the following man pages:

• ddi_dma_mem_alloc(9F)

• devmap_devmem_setup(9F)