path: root/arch/x86/kernel/mpparse_32.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/init.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/bootmem.h>
#include <linux/kernel_stat.h>
#include <linux/mc146818rtc.h>
#include <linux/bitops.h>

#include <asm/smp.h>
#include <asm/acpi.h>
#include <asm/mtrr.h>
#include <asm/mpspec.h>
#include <asm/io_apic.h>
#include <asm/bios_ebda.h>

#include <mach_apic.h>
#include <mach_apicdef.h>
#include <mach_mpparse.h>

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

/*
 * Various Linux-internal data structures created from the
 * MP-table.
 */
#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
int mp_bus_id_to_type [MAX_MP_BUSSES];
#endif
DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
static int mp_current_pci_id;

/* 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;

/* Make it easy to share the UP and SMP code: */
#ifndef CONFIG_X86_SMP
unsigned int num_processors;
unsigned disabled_cpus __cpuinitdata;
#ifndef CONFIG_X86_LOCAL_APIC
unsigned int boot_cpu_physical_apicid = -1U;
#endif
#endif

/* Make it easy to share the UP and SMP code: */
#ifndef CONFIG_X86_SMP
physid_mask_t phys_cpu_present_map;
#endif

/*
 * 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;
}

#ifdef CONFIG_X86_NUMAQ
/*
 * Have to match translation table entries to main table entries by counter
 * hence the mpc_record variable .... can't see a less disgusting way of
 * doing this ....
 */

static int mpc_record; 
static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __cpuinitdata;
#endif

static void __cpuinit generic_processor_info(int apicid, int version)
{
	int cpu;
	cpumask_t tmp_map;
	physid_mask_t phys_cpu;

	/*
	 * Validate version
	 */
	if (version == 0x0) {
		printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
				"fixing up to 0x10. (tell your hw vendor)\n",
				version);
		version = 0x10;
	}
	apic_version[apicid] = version;

	phys_cpu = apicid_to_cpu_present(apicid);
	physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);

	if (num_processors >= NR_CPUS) {
		printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
			"  Processor ignored.\n", NR_CPUS);
		return;
	}

	if (num_processors >= maxcpus) {
		printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
			" Processor ignored.\n", maxcpus);
		return;
	}

	num_processors++;
	cpus_complement(tmp_map, cpu_present_map);
	cpu = first_cpu(tmp_map);

	if (apicid == boot_cpu_physical_apicid)
		/*
		 * x86_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.
		 */
		cpu = 0;

	/*
	 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
	 * but we need to work other dependencies like SMP_SUSPEND etc
	 * before this can be done without some confusion.
	 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
	 *       - Ashok Raj <ashok.raj@intel.com>
	 */
	if (num_processors >