path: root/arch/x86_64/kernel/mpparse.c

/*
 *	Intel Multiprocessor Specification 1.1 and 1.4
 *	compliant MP-table parsing routines.
 *
 *	(c) 1995 Alan Cox, Building #3 <alan@redhat.com>
 *	(c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
 *
 *	Fixes
 *		Erich Boleyn	:	MP v1.4 and additional changes.
 *		Alan Cox	:	Added EBDA scanning
 *		Ingo Molnar	:	various cleanups and rewrites
 *		Maciej W. Rozycki:	Bits for default MP configurations
 *		Paul Diefenbaugh:	Added full ACPI support
 */

#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/bootmem.h>
#include <linux/smp_lock.h>
#include <linux/kernel_stat.h>
#include <linux/mc146818rtc.h>
#include <linux/acpi.h>

#include <asm/smp.h>
#include <asm/mtrr.h>
#include <asm/mpspec.h>
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
#include <asm/proto.h>

/* Have we found an MP table */
int smp_found_config;
unsigned int __initdata maxcpus = NR_CPUS;

int acpi_found_madt;

/*
 * Various Linux-internal data structures created from the
 * MP-table.
 */
int apic_version [MAX_APICS];
unsigned char mp_bus_id_to_type [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
cpumask_t pci_bus_to_cpumask [256] = { [0 ... 255] = CPU_MASK_ALL };

static int mp_current_pci_id = 0;
/* I/O APIC entries */
struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];

/* # of MP IRQ source entries */
struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];

/* MP IRQ source entries */
int mp_irq_entries;

int nr_ioapics;
int pic_mode;
unsigned long mp_lapic_addr = 0;



/* Processor that is doing the boot up */
unsigned int boot_cpu_id = -1U;
/* Internal processor count */
static unsigned int num_processors = 0;

/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;

/* ACPI MADT entry parsing functions */
#ifdef CONFIG_ACPI_BOOT
extern struct acpi_boot_flags acpi_boot;
#ifdef CONFIG_X86_LOCAL_APIC
extern int acpi_parse_lapic (acpi_table_entry_header *header);
extern int acpi_parse_lapic_addr_ovr (acpi_table_entry_header *header);
extern int acpi_parse_lapic_nmi (acpi_table_entry_header *header);
#endif /*CONFIG_X86_LOCAL_APIC*/
#ifdef CONFIG_X86_IO_APIC
extern int acpi_parse_ioapic (acpi_table_entry_header *header);
#endif /*CONFIG_X86_IO_APIC*/
#endif /*CONFIG_ACPI_BOOT*/

u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };


/*
 * Intel MP BIOS table parsing routines:
 */

/*
 * Checksum an MP configuration block.
 */

static int __init mpf_checksum(unsigned char *mp, int len)
{
	int sum = 0;

	while (len--)
		sum += *mp++;

	return sum & 0xFF;
}

static void __init MP_processor_info (struct mpc_config_processor *m)
{
	int ver;
	static int found_bsp=0;

	if (!(m->mpc_cpuflag & CPU_ENABLED))
		return;

	printk(KERN_INFO "Processor #%d %d:%d APIC version %d\n",
		m->mpc_apicid,
	       (m->mpc_cpufeature & CPU_FAMILY_MASK)>>8,
	       (m->mpc_cpufeature & CPU_MODEL_MASK)>>4,
		m->mpc_apicver);

	if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
		Dprintk("    Bootup CPU\n");
		boot_cpu_id = m->mpc_apicid;
	}
	if (num_processors >= NR_CPUS) {
		printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
			" Processor ignored.\n", NR_CPUS);
		return;
	}

	num_processors++;

	if (m->mpc_apicid > MAX_APICS) {
		printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
			m->mpc_apicid, MAX_APICS);
		return;
	}
	ver = m->mpc_apicver;

	physid_set(m->mpc_apicid, phys_cpu_present_map);
	/*
	 * Validate version
	 */
	if (ver == 0x0) {
		printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
		ver = 0x10;
	}
	apic_version[m->mpc_apicid] = ver;
 	if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
 		/*
 		 * bios_cpu_apicid is required to have processors listed
 		 * in same order as logical cpu numbers. Hence the first
 		 * entry is BSP, and so on.
 		 */
 		bios_cpu_apicid[0] = m->mpc_apicid;
 		x86_cpu_to_apicid[0] = m->mpc_apicid;
 		found_bsp = 1;
 	} else {
 		bios_cpu_apicid[num_processors - found_bsp] = m->mpc_apicid;
 		x86_cpu_to_apicid[num_processors - found_bsp] = m->mpc_apicid;
 	}
}

static void __init MP_bus_info (struct mpc_config_bus *m)
{
	char str[7];

	memcpy(str, m->mpc_bustype, 6);
	str[6] = 0;
	Dprintk("Bus #%d is %s\n", m->mpc_busid, str);

	if (strncmp(str, "ISA", 3) == 0) {