[Bug 223572] drm(4) pmap_mapdev()s PCI space addresses

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223572

            Bug ID: 223572
           Summary: drm(4) pmap_mapdev()s PCI space addresses
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jhibbits at FreeBSD.org

drm_get_resource_start() gets an rman resource start, which is not always
physical address.  On PowerPC, and any architecture that uses OFW/FDT, the
resources are specified in PCI space, not physical address space.  This causes
the wrong mappings to be generated, potentially stomping on real memory.

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