Date: Thu, 16 Oct 2003 03:44:24 -0700 (PDT) From: Bruce Evans <bde@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/isa apic_vector.s Message-ID: <200310161044.h9GAiOpF073056@repoman.freebsd.org>
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bde 2003/10/16 03:44:24 PDT
FreeBSD src repository
Modified files:
sys/i386/isa apic_vector.s
Log:
Don't forget to load %es with the kernel data segment selector in
Xcpustop(). %es is used in at least the call to savectx() when savectx()
calls bcopy(), so not loading it was fatal if a stop IPI interrupts
user mode.
This reduces bugs starting and stopping CPUs for debuggers. CPUs are
stopped mainly in kdb_trap() and cpu_reset(). At reset time there is
a good chance that all the CPUs are in the kernel, so the bug was
probably harmless then.
Revision Changes Path
1.90 +3 -0 src/sys/i386/isa/apic_vector.s
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