root/arch/x86/mach-generic/probe.c

DEFINITIONS

1. parse_apic
2. generic_bigsmp_probe
3. generic_apic_probe
4. mps_oem_check
5. acpi_madt_oem_check
6. hard_smp_processor_id

/*
 * Copyright 2003 Andi Kleen, SuSE Labs.
 * Subject to the GNU Public License, v.2
 *
 * Generic x86 APIC driver probe layer.
 */
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/genapic.h>

extern struct genapic apic_numaq;
extern struct genapic apic_summit;
extern struct genapic apic_bigsmp;
extern struct genapic apic_es7000;
extern struct genapic apic_default;

struct genapic *genapic = &apic_default;

static struct genapic *apic_probe[] __initdata = {
#ifdef CONFIG_X86_NUMAQ
        &apic_numaq,
#endif
#ifdef CONFIG_X86_SUMMIT
        &apic_summit,
#endif
#ifdef CONFIG_X86_BIGSMP
        &apic_bigsmp,
#endif
#ifdef CONFIG_X86_ES7000
        &apic_es7000,
#endif
        &apic_default,  /* must be last */
        NULL,
};

static int cmdline_apic __initdata;
static int __init parse_apic(char *arg)
{
        int i;

        if (!arg)
                return -EINVAL;

        for (i = 0; apic_probe[i]; i++) {
                if (!strcmp(apic_probe[i]->name, arg)) {
                        genapic = apic_probe[i];
                        cmdline_apic = 1;
                        return 0;
                }
        }

        /* Parsed again by __setup for debug/verbose */
        return 0;
}
early_param("apic", parse_apic);

void __init generic_bigsmp_probe(void)
{
#ifdef CONFIG_X86_BIGSMP
        /*
         * This routine is used to switch to bigsmp mode when
         * - There is no apic= option specified by the user
         * - generic_apic_probe() has chosen 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);
                }
#endif
}

void __init generic_apic_probe(void)
{
        if (!cmdline_apic) {
                int i;
                for (i = 0; apic_probe[i]; i++) {
                        if (apic_probe[i]->probe()) {
                                genapic = apic_probe[i];
                                break;
                        }
                }
                /* Not visible without early console */
                if (!apic_probe[i])
                        panic("Didn't find an APIC driver");
        }
        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;
}

int hard_smp_processor_id(void)
{
        return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
}