[SCM] GNU Mach branch, master, updated. v1.8-363-gc442d1a6

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit c442d1a656e16d12cefe2d3e9b57f764ca4bc755
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Aug 27 20:28:26 2022 +0200

    x86_64 boothdr: Fix _start symbol for multiboot address overrides
    
    We shouldn't be needing that since we won't use a.out for 64bit, but using
    address override in the multiboot header could be useful at least for
    testing.

commit f90ba97d5091ad85f089817231f53e34a0f6f259
Author: Luca Dariz <luca.dariz@gmail.com>
Date:   Sat Feb 5 18:51:24 2022 +0100

    add support for booting from grub with x86_64
    
    * configure: compile for native x86_64 by default instead of xen
    * x86_64/Makefrag.am: introduce KERNEL_MAP_BASE to reuse the constant
      in both code and linker script
    * x86_64/ldscript: use a .boot section for the very first operations,
      until we reach long mode. This section is not really allocated, so
      it doesn't need to be freed later. The vm system is later
      initialized starting from .text and not including .boot
    * link kernel at 0x4000000 as the xen version, higher values causes
      linker errors
    * we can't use full segmentation in long mode, so we need to create a
      temporary mapping during early boot to be able to jump to high
      addresses
    * build direct map for first 4G in boothdr, it seems required by Linux
      drivers
    * add INTEL_PTE_PS bit definition to enable 2MB pages during bootstrap
    * ensure write bit is set in PDP entry access rights. This only
      applies to PAE-enabled kernels, mandatory for x86_64. On xen
      platform it seems to be handled differently
    
    Signed-off-by: Luca Dariz <luca@orpolo.org>
    Message-Id: <20220205175129.309469-2-luca@orpolo.org>

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

Summary of changes:
 configure.ac          |   3 +-
 i386/configfrag.ac    |   2 +
 i386/i386/i386asm.sym |   1 +
 i386/i386/vm_param.h  |   2 +-
 i386/intel/pmap.c     |   4 +-
 i386/intel/pmap.h     |   1 +
 x86_64/Makefrag.am    |  17 +++-
 x86_64/boothdr.S      | 236 ++++++++++++++++++++++++++++++++++++++++++++++++++
 x86_64/ldscript       |  28 +++---
 9 files changed, 278 insertions(+), 16 deletions(-)
 create mode 100644 x86_64/boothdr.S


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