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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-09-07 01:51:32 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-07 17:39:59 +0200 |
| commit | 5394f80f92642c61fc2a95385be85f2fdcfb5adb (patch) | |
| tree | 313dd51430cf7ff7f7161019bb3d3bf89320357c /arch/x86/mm | |
| parent | 7686ad5606f08d9dfb33a2087a36c8366366015b (diff) | |
| download | op-kernel-dev-5394f80f92642c61fc2a95385be85f2fdcfb5adb.zip op-kernel-dev-5394f80f92642c61fc2a95385be85f2fdcfb5adb.tar.gz | |
x86: check for and defend against BIOS memory corruption
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>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/fault.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 455f3fe..5140bdf 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -848,6 +848,8 @@ no_context: * Oops. The kernel tried to access some bad page. We'll have to * terminate things with extreme prejudice. */ + check_for_bios_corruption(); + #ifdef CONFIG_X86_32 bust_spinlocks(1); #else |
