x86-32: Use symbolic constants, safer CPUID when enabling EFER.NX

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Use symbolic constants rather than hard-coded values when setting
EFER.NX in head_32.S, and do a more rigorous test for the validity of
the response when probing for the extended CPUID range.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <1258154897-6770-2-git-send-email-hpa@zytor.com>
Acked-by: Kees Cook <kees.cook@canonical.com>

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H. Peter Anvin 2009-11-13 15:28:13 -08:00

parent 196cf0d67a

commit 8a50e5135a

1 changed files with 11 additions and 7 deletions

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arch/x86/kernel/head_32.S

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