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x86: check for and defend against BIOS memory corruption

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Some BIOSes have been observed to corrupt memory in the low 64k.  This
change:
 - Reserves all memory which does not have to be in that area, to
   prevent it from being used as general memory by the kernel.  Things
   like the SMP trampoline are still in the memory, however.
 - Clears the reserved memory so we can observe changes to it.
 - Adds a function check_for_bios_corruption() which checks and reports on
   memory becoming unexpectedly non-zero.  Currently it's called in the
   x86 fault handler, and the powermanagement debug output.

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-09-07 01:51:32 -07:00
committed by Ingo Molnar
parent 7686ad5606
commit 5394f80f92
6 changed files with 110 additions and 0 deletions
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5
Documentation/kernel-parameters.txt
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@ -360,6 +360,11 @@ and is between 256 and 4096 characters. It is defined in the file
Format: <io>,<irq>,<mode>
See header of drivers/net/hamradio/baycom_ser_hdx.c.
bios_corruption_check=0/1 [X86]
Some BIOSes seem to corrupt the first 64k of memory
when doing things like suspend/resume. Setting this
option will scan the memory looking for corruption.
boot_delay= Milliseconds to delay each printk during boot.
Values larger than 10 seconds (10000) are changed to
no delay (0).