• Rik van Riel's avatar
    x86: 46 bit physical address support on 64 bits · c898faf9
    Rik van Riel authored
    Extend the maximum addressable memory on x86-64 from 2^44 to
    2^46 bytes. This requires some shuffling around of the vmalloc
    and virtual memmap memory areas, to keep them away from the
    direct mapping of up to 64TB of physical memory.
    
    This patch also introduces a guard hole between the vmalloc
    area and the virtual memory map space.  There's really no
    good reason why we wouldn't have a guard hole there.
    
    [ Impact: future hardware enablement ]
    Signed-off-by: default avatarRik van Riel <riel@redhat.com>
    LKML-Reference: <20090505172856.6820db22@cuia.bos.redhat.com>
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
    c898faf9
sparsemem.h 895 Bytes