Mapping non-prefetchable storage locations into memory mapped input/output space

摘要

A system including a host and a device. The device has at least one non-prefetchable storage location. The host and the device are configured to map the at least one non-prefetchable storage location into memory mapped input/output space that is addressed via greater than 32 address bits.

主权项

1. A system comprising:
a serial communication link; a host coupled to the serial communication link; and a device coupled to the serial communication link having at least one non-prefetchable storage location, wherein the host and the device are configured to map the at least one non-prefetchable storage location into memory mapped input/output space that is addressed via greater than 32 address bits based on system policy that ensures one of: 1) no bridges are in the system; and 2) a) the device is coupled to the host without an intervening bridge, and b) devices below a bridge are prohibited from doing peer-to-peer requests.