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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/config.h>
#include <xen/cpumask.h>
#include <xen/string.h>
#include <xen/kernel.h>
#include <xen/ctype.h>
#include <xen/init.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>
extern const struct genapic apic_bigsmp;
const struct genapic *__read_mostly genapic;
const struct genapic *apic_probe[] __initdata = {
&apic_bigsmp,
&apic_default, /* must be last */
NULL,
};
static bool_t __initdata cmdline_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 (!cmdline_apic && genapic == &apic_default)
if (apic_bigsmp.probe()) {
genapic = &apic_bigsmp;
printk(KERN_INFO "Overriding APIC driver with %s\n",
genapic->name);
}
}
static void __init genapic_apic_force(char *str)
{
int i;
for (i = 0; apic_probe[i]; i++)
if (!strcmp(apic_probe[i]->name, str))
genapic = apic_probe[i];
}
custom_param("apic", genapic_apic_force);
void __init generic_apic_probe(void)
{
int i, changed;
record_boot_APIC_mode();
check_x2apic_preenabled();
cmdline_apic = changed = (genapic != NULL);
for (i = 0; !changed && apic_probe[i]; i++) {
if (apic_probe[i]->probe()) {
changed = 1;
genapic = apic_probe[i];
}
}
if (!changed)
genapic = &apic_default;
printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
}
/* These functions can switch the APIC even after the initial ->probe() */
int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid)
{
int i;
for (i = 0; apic_probe[i]; ++i) {
if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) {
if (!cmdline_apic) {
genapic = apic_probe[i];
printk(KERN_INFO "Switched to APIC driver `%s'.\n",
genapic->name);
}
return 1;
}
}
return 0;
}
int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
int i;
for (i = 0; apic_probe[i]; ++i) {
if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
if (!cmdline_apic) {
genapic = apic_probe[i];
printk(KERN_INFO "Switched to APIC driver `%s'.\n",
genapic->name);
}
return 1;
}
}
return 0;
}
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