Method and system for preventing peripheral component interconne

Details Method and system for preventing peripheral component interconne Method and system for preventing peripheral component interconne

1996-12-13

1998-06-02

Ray, Gopal C.

395308, 395280, G06F 1342, G06F 1300

Patent

active

057614610

ABSTRACT:
A method for preventing peer-to-peer access across separate Peripheral Component Interconnect (PCI) host bridges within a data-processing system is described. In accordance with the method and system of the present invention, during an access request from a PCI device, a first determination is made as to whether or not the access request is for a system memory attached to a system bus. In response to a determination that the access request is not for a system memory attached to the system bus, another determination is made as to whether or not the access request is for a PCI device under the same PCI host bridge as the requesting PCI device. In response to a determination that the access request is not for a PCI device under the same PCI host bridge as the requesting PCI device, denying the access request such that a PCI peer-to-peer access across separate PCI host bridges within a data processing system is prevented.

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