static __init void xen_init_cpuid_mask(void)
{
unsigned int ax, bx, cx, dx;
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
(1 << X86_FEATURE_MCA) | /* disable MCA */
(1 << X86_FEATURE_ACC)); /* thermal monitoring */
if (!xen_initial_domain())
cpuid_leaf1_edx_mask &=
~((1 << X86_FEATURE_APIC) | /* disable local APIC */
(1 << X86_FEATURE_ACPI)); /* disable ACPI */
ax = 1;
cx = 0;
xen_cpuid(&ax, &bx, &cx, &dx);
/* cpuid claims we support xsave; try enabling it to see what happens */
if (cx & (1 << (X86_FEATURE_XSAVE % 32))) {
unsigned long cr4;
set_in_cr4(X86_CR4_OSXSAVE);
cr4 = read_cr4();
if ((cr4 & X86_CR4_OSXSAVE) == 0)
cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_XSAVE % 32));
clear_in_cr4(X86_CR4_OSXSAVE);
}
}
void __init stop_mce(void)
{
old_cr4 = read_cr4();
clear_in_cr4(X86_CR4_MCE);
}
static void cr4_pce_disable(void *arg)
{
clear_in_cr4(X86_CR4_PCE);
}
