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authorH.J. Lu <hjl.tools@gmail.com>2018-07-26 11:10:08 -0700
committerH.J. Lu <hjl.tools@gmail.com>2018-07-26 11:10:44 -0700
commit65d87ade1ee6f3ac099105e3511bd09bdc24cf3f (patch)
tree4a4a37507e6e33c4484f5a2f53883bc5052c927f /sysdeps/x86/cpu-features.c
parentc9dc4d5117afea7283d5fd80c80be8cc09cde84d (diff)
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x86: Correct index_cpu_LZCNT [BZ # 23456]
cpu-features.h has

 #define bit_cpu_LZCNT		(1 << 5)
 #define index_cpu_LZCNT	COMMON_CPUID_INDEX_1
 #define reg_LZCNT

But the LZCNT feature bit is in COMMON_CPUID_INDEX_80000001:

Initial EAX Value: 80000001H
ECX Extended Processor Signature and Feature Bits:
Bit 05: LZCNT available

index_cpu_LZCNT should be COMMON_CPUID_INDEX_80000001, not
COMMON_CPUID_INDEX_1.  The VMX feature bit is in COMMON_CPUID_INDEX_1:

Initial EAX Value: 01H
Feature Information Returned in the ECX Register:
5 VMX

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

	[BZ # 23456]
	* sysdeps/x86/cpu-features.h (index_cpu_LZCNT): Set to
	COMMON_CPUID_INDEX_80000001.
Diffstat (limited to 'sysdeps/x86/cpu-features.c')
0 files changed, 0 insertions, 0 deletions