[SCM] GNU Mach branch, master, updated. v1.8-837-g429762dc

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 429762dca4d313140067d14e1c448ee68d1644d2
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Mon Feb 5 23:22:00 2024 +0100

    apboot: avoid self-modifying code
    
    self-modifying code is generally frowned upon, Intel largely says the
    support is model-dependent.  We can as well just relocate from the C
    code like we did for the temporary gdt.

commit e211bdce3388a3c9e3dafab903dd53374f6d9759
Author: Damien Zammit <damien@zamaudio.com>
Date:   Mon Feb 5 23:10:45 2024 +0100

    smp: Remove hardcoded AP_BOOT_ADDR
    
    This took some time to figure out.
    Involves a hand-crafted 16 bit assembly instruction [1]
    because it requires an immediate for the memory address
    of far jump.  This required self-modifying code
    to inject the next instruction, therefore I added a near
    jump to clear the instruction cache queue in case the pipeline
    cached the unmodified jump location.
    
    [1] Intel Architecture Software Developer's Manual,
        Volume 2: Instruction Set Reference Manual

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

Summary of changes:
 i386/i386/cpuboot.S     | 26 +++++++++++++++++++-------
 i386/i386/mp_desc.c     |  5 +++--
 i386/i386/mp_desc.h     |  7 +++++--
 i386/i386at/model_dep.c | 23 +++++++++++++++++++++++
 4 files changed, 50 insertions(+), 11 deletions(-)


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