[PATCH] i386/x86-64: Check that MCFG points to an e820 reserved area

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This patch introduces a user for the e820_all_mapped function:

There have been several machines that don't have a working MMCONFIG,
often because of a buggy MCFG table in the ACPI bios.  This patch adds a
simple sanity check that detects a whole bunch of these cases, and when
it detects it, linux now boots rather than crash-and-burns.

The accuracy of this detection can in principle be improved if there was
a "is this entire range in e820 with THIS attribute", but no such
function exist and the complexity needed for this is not really worth
it; this simple check already catches most cases anyway.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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Arjan van de Ven 2006-04-07 19:49:30 +02:00 • committed by Linus Torvalds

parent 952223683e

commit 946f2ee5c7

2 changed files with 21 additions and 0 deletions

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11

arch/i386/pci/mmconfig.c

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10

arch/x86_64/pci/mmconfig.c

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