Patents by Inventor Peter Giles Lloyd

Peter Giles Lloyd has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Data processing apparatus using privileged and non-privileged modes with multiple stacks
    Patent number: 9645949
    Abstract: Embodiments of the invention relate to a data processing apparatus including a processor adapted to operate under control of an executable comprising instructions, and in any of a plurality of operating modes including a non-privileged mode and a privileged mode, the apparatus comprising: means for storing a plurality of stacks; a first stack pointer register for storing a pointer to an address in a first of said stacks; a second stack pointer register for storing a pointer to an address in a second of said stacks, wherein said processing apparatus is adapted to use said second stack pointer when said processor is operating in either the non-privileged mode or the privileged mode; and means for transferring operation of said processor from the non-privileged mode to the privileged mode in response to at least one of said instructions. Embodiments of the invention also relate to a method of operating a data processing apparatus.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: May 9, 2017
    Assignee: Cambridge Consultants Ltd.
    Inventors: Alistair G. Morfey, Karl Leighton Swepson, Peter Giles Lloyd
  • DATA PROCESSING APPARATUS, FOR EXAMPLE USING MODES
    Publication number: 20120036341
    Abstract: Embodiments of the invention relate to a data processing apparatus including a processor adapted to operate under control of an executable comprising instructions, and in any of a plurality of operating modes including a non-privileged mode and a privileged mode, the apparatus comprising: means for storing a plurality of stacks; a first stack pointer register for storing a pointer to an address in a first of said stacks; a second stack pointer register for storing a pointer to an address in a second of said stacks, wherein said processing apparatus is adapted to use said second stack pointer when said processor is operating in either the non-privileged mode or the privileged mode; and means for transferring operation of said processor from the non-privileged mode to the privileged mode in response to at least one of said instructions. Embodiments of the invention also relate to a method of operating a data processing apparatus.
    Type: Application
    Filed: May 27, 2009
    Publication date: February 9, 2012
    Applicant: Cambridge Consultants Ltd.
    Inventors: Alistair G. Morfey, Karl Leighton Swepson, Peter Giles Lloyd