[SCM] GNU Mach branch, master, updated. v1.7-64-g6555317

[Justus Winter]

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- Log -----------------------------------------------------------------
commit 65553178d1222b3291143bdddfef9478e0b09021
Author: Justus Winter <address@hidden>
Date:   Sat Oct 22 13:33:05 2016 +0200

    i386: Use discontiguous page directories when using PAE.
    
    Previously, we used contiguous page directories four pages in length
    when using PAE.  To prevent physical memory fragmentation, we need to
    use virtual memory for objects spanning multiple pages.  Virtual
    kernel memory, however, is a scarce commodity.
    
    * i386/intel/pmap.h (lin2pdenum): Never include the page directory pointer 
table index.
    (lin2pdenum_cont): New macro which does include said index.
    (struct pmap): Remove the directory base pointer when using PAE.
    * i386/intel/pmap.c (pmap_pde): Fix lookup.
    (pmap_pte): Fix check for uninitialized pmap.
    (pmap_bootstrap): Do not store the page directory base if PAE.
    (pmap_init): Reduce size of page directories to one page, use
    direct-mapped memory.
    (pmap_create): Allocate four page directories per pmap.
    (pmap_destroy): Adapt to the discontinuous directories.
    (pmap_collect): Likewise.
    * i386/i386/xen.h (hyp_mmu_update_la): Adapt code manipulating the
    kernels page directory.
    * i386/i386at/model_dep.c (i386at_init): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 i386/i386/xen.h         |    2 +-
 i386/i386at/model_dep.c |   16 +--
 i386/intel/pmap.c       |  304 +++++++++++++++++++++++++++++------------------
 i386/intel/pmap.h       |   14 ++-
 4 files changed, 205 insertions(+), 131 deletions(-)


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