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x86, setup: guard against pre-ACPI 3 e820 code not updating %ecx
author
H. Peter Anvin
<hpa@zytor.com>
Wed, 1 Apr 2009 18:35:00 +0000
(11:35 -0700)
committer
H. Peter Anvin
<hpa@zytor.com>
Wed, 1 Apr 2009 18:35:00 +0000
(11:35 -0700)
Impact: BIOS bug safety
For pre-ACPI 3 BIOSes, pre-initialize the end of the e820 buffer just
in case the BIOS returns an unchanged %ecx but without actually
touching the ACPI 3 extended flags field.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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