busdma know, so that on architectures where dma isn't always coherent, we
know we don't have to write-back/invalidates cachelines on DMA operations.
Reviewed by: andrew, mav
in some arm64 hardware, for example the AMD Opteron A1100.
Reviewed by: mav
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D8852
typically memory mapped bus, for example on the AMD Opteron A1100 the AHCI
device is mapped in the CPUs address space, and not through a PCI
controller.
Further work is needed for this to work with ACPI as this is expected to be
common on ARMv8 servers.
Reviewed by: mav, mmel
Obtained from: mmel, ABT Systems Ltd
Relnotes: yes
Sponsored by: SoftIron Inc
Differential Revision: https://reviews.freebsd.org/D4269
