• Chris Metcalf's avatar
    arch/tile: Allow tilegx to build with either 16K or 64K page size · d5d14ed6
    Chris Metcalf authored
    This change introduces new flags for the hv_install_context()
    API that passes a page table pointer to the hypervisor.  Clients
    can explicitly request 4K, 16K, or 64K small pages when they
    install a new context.  In practice, the page size is fixed at
    kernel compile time and the same size is always requested every
    time a new page table is installed.
    
    The <hv/hypervisor.h> header changes so that it provides more abstract
    macros for managing "page" things like PFNs and page tables.  For
    example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old
    HV_PAGE_SIZE_SMALL.  The various PFN routines have been eliminated and
    only PA- or PTFN-based ones remain (since PTFNs are always expressed
    in fixed 2KB "page" size).  The page-table management macros are
    renamed with a leading underscore and take page-size arguments with
    the presumption that clients will use those macros in some single
    place to provide the "real" macros they will use themselves.
    
    I happened to notice the old hv_set_caching() API was totally broken
    (it assumed 4KB pages) so I changed it so it would nominally work
    correctly with other page sizes.
    
    Tag modules with the page size so you can't load a module built with
    a conflicting page size.  (And add a test for SMP while we're at it.)
    Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
    d5d14ed6
pgtable.c 17 KB