static int __init detect_init_APIC (void)
{
/* Disabled by DMI scan or kernel option? */
if (dont_enable_local_apic)
return -1;
/* Don't force the APIC if the BIOS didn't enable it. Usually
it is broken in some way. */
if (!cpu_has_apic)
{
printk(KERN_INFO "APIC disabled by BIOS.\n");
return -1;
}
set_bit(X86_FEATURE_APIC, &boot_cpu_data.x86_capability);
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
boot_cpu_id = 0;
if (nmi_watchdog != NMI_NONE)
nmi_watchdog = NMI_LOCAL_APIC;
printk(KERN_INFO "Found and enabled local APIC!\n");
apic_pm_init1();
return 0;
}
static int __init detect_init_APIC (void)
{
u32 h, l, features;
extern void get_cpu_vendor(struct cpuinfo_x86*);
/* Workaround for us being called before identify_cpu(). */
get_cpu_vendor(&boot_cpu_data);
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1)
break;
goto no_apic;
case X86_VENDOR_INTEL:
if (boot_cpu_data.x86 == 6 ||
(boot_cpu_data.x86 == 15 && cpu_has_apic) ||
(boot_cpu_data.x86 == 5 && cpu_has_apic))
break;
goto no_apic;
default:
goto no_apic;
}
if (!cpu_has_apic) {
/*
* Some BIOSes disable the local APIC in the
* APIC_BASE MSR. This can only be done in
* software for Intel P6 and AMD K7 (Model > 1).
*/
rdmsr(MSR_IA32_APICBASE, l, h);
if (!(l & MSR_IA32_APICBASE_ENABLE)) {
printk("Local APIC disabled by BIOS -- reenabling.\n");
l &= ~MSR_IA32_APICBASE_BASE;
l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE;
wrmsr(MSR_IA32_APICBASE, l, h);
}
}
/*
* The APIC feature bit should now be enabled
* in `cpuid'
*/
features = cpuid_edx(1);
if (!(features & (1 << X86_FEATURE_APIC))) {
printk("Could not enable APIC!\n");
return -1;
}
set_bit(X86_FEATURE_APIC, &boot_cpu_data.x86_capability);
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
boot_cpu_physical_apicid = 0;
if (nmi_watchdog != NMI_NONE)
nmi_watchdog = NMI_LOCAL_APIC;
printk("Found and enabled local APIC!\n");
apic_pm_init1();
return 0;
no_apic:
printk("No local APIC present or hardware disabled\n");
return -1;
}
