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System and method for performing secure device communications in a peer-to-peer bus architecture

  • US 6,061,794 A
  • Filed: 09/30/1997
  • Issued: 05/09/2000
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Term
First Claim
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1. A method for protecting a first device coupled to an input/output (I/O) bus from being accessed in an unauthorized manner by a second device coupled to the I/O bus, the method comprising:

  • transmitting to the first device a request to perform a peer-to-peer operation across the I/O bus without intervention from an operating system;

    determining if said request is authentic as being dispatched from the second device;

    determining if the second device is authorized to request the first device to perform said peer-to-peer operation; and

    performing said peer-to-peer operation by said first device, without intervention from the operating system, if said request is authentic from the second device and if the second device is authorized to request said peer-to-peer operation.

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