Date: Thu, 8 May 2003 01:25:51 -0700 (PDT) From: Peter Wemm <peter@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/amd64/amd64 machdep.c trap.c Message-ID: <200305080825.h488Pp79021876@repoman.freebsd.org>
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peter 2003/05/08 01:25:51 PDT
FreeBSD src repository
Modified files:
sys/amd64/amd64 machdep.c trap.c
Log:
Oops. Turn T_PAGEFLT back into an interrupt gate. It is *critical*
that interrupts be disabled and remain disabled until %cr2 is read.
Otherwise we can preempt and another process can fault, and by the
time we read %cr2, we see a different processes fault address. This
Greatly Confuses vm_fault() (to say the least). The i386 port has
got this marked as a bug workaround for a Cyrix CPU, which is what
lead me astray. Its actually necessary for preemption, regardless
of whether Cyrix cpus had a bug or not.
Revision Changes Path
1.568 +1 -1 src/sys/amd64/amd64/machdep.c
1.253 +9 -1 src/sys/amd64/amd64/trap.c
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