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/* Copyright 2003 Andi Kleen, SuSE Labs.
* Subject to the GNU Public License, v.2
*
* Generic x86 APIC driver probe layer.
*/
#include <xen/cpumask.h>
#include <xen/string.h>
#include <xen/kernel.h>
#include <xen/ctype.h>
#include <xen/init.h>
#include <xen/param.h>
#include <asm/cache.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/mach-generic/mach_apic.h>
#include <asm/setup.h>
struct genapic __read_mostly genapic;
static const struct genapic *const __initconstrel apic_probe[] = {
&apic_bigsmp,
&apic_default, /* must be last */
NULL,
};
static bool __initdata forced_apic;
void __init generic_bigsmp_probe(void)
{
/*
* This routine is used to switch to bigsmp mode when
* - There is no apic= option specified by the user
* - generic_apic_probe() has choosen apic_default as the sub_arch
* - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
*/
if (!forced_apic && genapic.name == apic_default.name)
if (apic_bigsmp.probe()) {
genapic = apic_bigsmp;
printk(KERN_INFO "Overriding APIC driver with %s\n",
genapic.name);
}
}
static int __init cf_check genapic_apic_force(const char *str)
{
int i, rc = -EINVAL;
for (i = 0; apic_probe[i]; i++)
if (!strcmp(apic_probe[i]->name, str)) {
genapic = *apic_probe[i];
rc = 0;
}
return rc;
}
custom_param("apic", genapic_apic_force);
void __init generic_apic_probe(void)
{
int i;
record_boot_APIC_mode();
check_x2apic_preenabled();
forced_apic = genapic.name;
for (i = 0; !genapic.name && apic_probe[i]; i++) {
if (!apic_probe[i]->probe || apic_probe[i]->probe())
genapic = *apic_probe[i];
}
BUG_ON(!genapic.name);
printk(KERN_INFO "Using APIC driver %s\n", genapic.name);
}
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