[SCM] GNU Mach branch, master, updated. v1.4-417-g7b24514

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 7b24514f549f65ecc30ad06312a775b65ff99653
Merge: b9a59e4 2d91aea
Author: Samuel Thibault <address@hidden>
Date:   Mon Mar 3 00:58:06 2014 +0100

    Merge branch 'master' of git.savannah.gnu.org:/srv/git/hurd/gnumach

commit b9a59e483225093dec4e28ee5841b5b7f5e73562
Author: Samuel Thibault <address@hidden>
Date:   Mon Mar 3 00:50:33 2014 +0100

    Keep two virtual pages as mapping windows to access physical memory
    
    PCI devices expose their memory etc. way beyond last_phys_addr. Userland
    drivers opening /dev/mem need to open those too, even if phystokv() will
    not work for them.
    
    * i386/intel/pmap.h (pmap_mapwindow_t): New type.
    (pmap_get_mapwindow, pmap_put_mapwindow): New prototypes.
    (PMAP_NMAPWINDOWS): New macro.
    * i386/intel/pmap.c (mapwindows): New array.
    (pmap_get_mapwindow, pmap_put_mapwindow): New functions.
    (pmap_bootstrap, pmap_virtual_space): Reserve virtual pages for the mapping
    windows.
    * i386/i386/phys.c: Include <i386/model_dep.h>
    (INTEL_PTE_W, INTEL_PTE_R): New macros
    (pmap_zero_page, pmap_copy_page, copy_to_phys, copy_from_phys): Use
    `pmap_get_mapwindow' to temporarily map physical pages beyond 
last_phys_addr.

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

Summary of changes:
 i386/i386/phys.c  |   79 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 i386/intel/pmap.c |   43 ++++++++++++++++++++++++++++-
 i386/intel/pmap.h |   10 +++++++
 3 files changed, 127 insertions(+), 5 deletions(-)


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