[SCM] GNU Mach branch, master, updated. v1.8-957-g106b0376

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 106b03767c910f9516347b9c6d7f7e009e0f1a09
Author: Damien Zammit via Bug reports for the GNU Hurd <bug-hurd@gnu.org>
Date:   Mon Dec 9 12:17:53 2024 +0000

    smp: Use logical destination not physical apic id
    
    Since modern x86 cpus only support 4 bits of destination field
    in ICR, we could only address up to 16 processors, assuming
    their physical APIC ID was < 0x10.  Some processors eg AMD fam15h
    have physical apic ids starting at 0x10 but only support 4 bits.
    So these lapics are unaddressable using physical destination mode.
    
    Therefore, we switch to using logical destinations for IPIs which
    gives us 8 bits of unique mask for addressing up to 8 groups of processors.
    
    INIT and STARTUP is not changed here.
    
    Message-ID: <20241209121706.879984-6-damien@zamaudio.com>

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

Summary of changes:
 i386/i386/apic.c      | 11 ++++++++---
 i386/i386/apic.h      |  4 ++++
 i386/i386/ast_check.c |  2 +-
 i386/i386/mp_desc.c   |  2 +-
 i386/i386/smp.c       | 14 +++++++-------
 i386/i386/smp.h       |  4 ++--
 6 files changed, 23 insertions(+), 14 deletions(-)


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