[SCM] GNU Mach branch, master, updated. v1.8-783-g60c53f56

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 60c53f565454a6afd8f0b80d36d791d50653751d
Author: Damien Zammit <damien@zamaudio.com>
Date:   Mon Oct 2 03:39:13 2023 +0000

    Fix interrupt handling
    
    Logic for interrupts:
    
    - interrupt.S raises spl (thus IF cleared)
    - interrupt.S EOI
    - interrupt.S calls the handler
       - for pure in-kernel handlers, they do whatever they want with IF
         cleared.
       - when a userland handler is registers, queue_intr masks the irq.
    - interrupt.S lowers spl with splx_cli, thus IF still cleared
    - iret, that sets IF
    
    - later on, userland acks the IRQ, that unmasks the irq
    
    The key to this change is that all interrupts, including IPIs, are
    treated the same way. Eg. the spl level is now raised before an IPI and
    restored after. Also, EOI is not needed inside irq_acknowledge.
    
    With this change and the experimental change not to dispatch threads
    direct to idle processors in the scheduler, I no longer observe kernel
    faults, but an occasional hang does occur.
    
    Message-Id: <20231002033906.124427-1-damien@zamaudio.com>

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

Summary of changes:
 device/intr.c           | 16 ++++++++++++++--
 i386/i386at/interrupt.S | 28 +++++++++++++---------------
 x86_64/interrupt.S      | 28 +++++++++++++---------------
 3 files changed, 40 insertions(+), 32 deletions(-)


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