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SYSENTER fix for x86_64 CPUs 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1565 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-09-03 16:25:14 +00:00
parent aa0bc6b68c
commit ca0d1734b4
1 changed files with 7 additions and 1 deletions
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8
kqemu.c
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@ -119,13 +119,19 @@ static void kqemu_update_cpuid(CPUState *env)
critical_features_mask =
CPUID_CMOV | CPUID_CX8 |
CPUID_FXSR | CPUID_MMX | CPUID_SSE |
CPUID_SSE2;
CPUID_SSE2 | CPUID_SEP;
if (!is_cpuid_supported()) {
features = 0;
} else {
cpuid(1, eax, ebx, ecx, edx);
features = edx;
}
#ifdef __x86_64__
/* NOTE: on x86_64 CPUs, SYSENTER is not supported in
compatibility mode, so in order to have the best performances
it is better not to use it */
features &= ~CPUID_SEP;
#endif
env->cpuid_features = (env->cpuid_features & ~critical_features_mask) |
(features & critical_features_mask);
/* XXX: we could update more of the target CPUID state so that the