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x86-64: Handle exception table entries during early boot

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If we get an exception during early boot, walk the exception table to
see if we should intercept it.  The main use case for this is to allow
rdmsr_safe()/wrmsr_safe() during CPU initialization.

Since the exception table is currently sorted at runtime, and fairly
late in startup, this code walks the exception table linearly.  We
obviously don't need to worry about modules, however: none have been
loaded at this point.

[ v2: Use early_fixup_exception() instead of linear search ]

Link: http://lkml.kernel.org/r/1334794610-5546-5-git-send-email-hpa@zytor.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2012-04-18 17:16:49 -07:00 • committed by H. Peter Anvin
parent 6a1ea279c2
commit 9900aa2f95
2 changed files with 58 additions and 20 deletions
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2
arch/x86/include/asm/segment.h
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@ -213,7 +213,7 @@
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];
extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][2+2+5];
/*
* Load a segment. Fall back on loading the zero