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    Subject[patch 00/11] GRU Driver

    This series of patches adds a driver for the SGI UV GRU. The driver is still
    in development but it currently compiles for both x86_64 & IA64. All simple
    regression tests pass on IA64. Although features remain to be added, I'd like to
    start the process of getting the driver into the kernel. Additional kernel
    drivers will depend on services provide by the GRU driver.

    The GRU is a hardware resource located in the system chipset. The GRU
    contains memory that is mmaped into the user address space. This memory is
    used to communicate with the GRU to perform functions such as load/store,
    scatter/gather, bcopy, AMOs, etc. The GRU is directly accessed by user
    instructions using user virtual addresses. GRU instructions (ex., bcopy) use
    user virtual addresses for operands.

    The GRU contains a large TLB that is functionally very similar to processor TLBs.
    Because the external contains a TLB with user virtual address, it requires
    callouts from the core VM system when certain types of changes are made to
    the process page tables. There are several MMUOPS patches currently being
    discussed but none has been accepted into the kernel. The GRU driver
    is built using version V18 from Andrea Arcangeli.

    --- jack

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