x86: merge mpparse_{32,64}.c

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1102 insertions, 0 deletions

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
new file mode 100644
index 00000000000..6e5e4547981
--- /dev/null
+++ b/arch/x86/kernel/mpparse.c
@@ -0,0 +1,1102 @@
+/*
+ *	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>
+ *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
+ */
+
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/kernel_stat.h>
+#include <linux/mc146818rtc.h>
+#include <linux/bitops.h>
+#include <linux/acpi.h>
+#include <linux/module.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>
+#include <asm/acpi.h>
+#include <asm/bios_ebda.h>
+
+#include <mach_apic.h>
+#ifdef CONFIG_X86_32
+#include <mach_apicdef.h>
+#include <mach_mpparse.h>
+#endif
+
+/* Have we found an MP table */
+int smp_found_config;
+
+/*
+ * 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;
+
+int pic_mode;
+
+/*
+ * 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 MP_processor_info(struct mpc_config_processor *m)
+{
+	int apicid;
+	char *bootup_cpu = "";
+
+	if (!(m->mpc_cpuflag & CPU_ENABLED)) {
+		disabled_cpus++;
+		return;
+	}
+#ifdef CONFIG_X86_NUMAQ
+	apicid = mpc_apic_id(m, translation_table[mpc_record]);
+#else
+	apicid = m->mpc_apicid;
+#endif
+	if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
+		bootup_cpu = " (Bootup-CPU)";
+		boot_cpu_physical_apicid = m->mpc_apicid;
+	}
+
+	printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
+	generic_processor_info(apicid, m->mpc_apicver);
+}
+
+static void __init MP_bus_info(struct mpc_config_bus *m)
+{
+	char str[7];
+
+	memcpy(str, m->mpc_bustype, 6);
+	str[6] = 0;
+
+#ifdef CONFIG_X86_NUMAQ
+	mpc_oem_bus_info(m, str, translation_table[mpc_record]);
+#else
+	Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
+#endif
+
+#if MAX_MP_BUSSES < 256
+	if (m->mpc_busid >= MAX_MP_BUSSES) {
+		printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
+		       " is too large, max. supported is %d\n",
+		       m->mpc_busid, str, MAX_MP_BUSSES - 1);
+		return;
+	}
+#endif
+
+	if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
+		 set_bit(m->mpc_busid, mp_bus_not_pci);
+#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
+#endif
+	} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
+#ifdef CONFIG_X86_NUMAQ
+		mpc_oem_pci_bus(m, translation_table[mpc_record]);
+#endif
+		clear_bit(m->mpc_busid, mp_bus_not_pci);
+		mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
+		mp_current_pci_id++;
+#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
+	} else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
+	} else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
+		mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
+#endif
+	} else
+		printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
+}
+
+#ifdef CONFIG_X86_IO_APIC
+
+static int bad_ioapic(unsigned long address)
+{
+	if (nr_ioapics >= MAX_IO_APICS) {
+		printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
+		       "(found %d)\n", MAX_IO_APICS, nr_ioapics);
+		panic("Recompile kernel with bigger MAX_IO_APICS!\n");
+	}
+	if (!address) {
+		printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
+		       " found in table, skipping!\n");
+		return 1;
+	}
+	return 0;
+}
+
+static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
+{
+	if (!(m->mpc_flags & MPC_APIC_USABLE))
+		return;
+
+	printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
+	       m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
+
+	if (bad_ioapic(m->mpc_apicaddr))
+		return;
+
+	mp_ioapics[nr_ioapics] = *m;
+	nr_ioapics++;
+}
+
+static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
+{
+	mp_irqs[mp_irq_entries] = *m;
+	Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
+		" IRQ %02x, APIC ID %x, APIC INT %02x\n",
+		m->mpc_irqtype, m->mpc_irqflag & 3,
+		(m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
+		m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
+	if (++mp_irq_entries == MAX_IRQ_SOURCES)
+		panic("Max # of irq sources exceeded!!\n");
+}
+
+#endif
+
+static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
+{
+	Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
+		" IRQ %02x, APIC ID %x, APIC LINT %02x\n",
+		m->mpc_irqtype, m->mpc_irqflag & 3,
+		(m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
+		m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
+}
+
+#ifdef CONFIG_X86_NUMAQ
+static void __init MP_translation_info(struct mpc_config_translation *m)
+{
+	printk(KERN_INFO
+	       "Translation: record %d, type %d, quad %d, global %d, local %d\n",
+	       mpc_record, m->trans_type, m->trans_quad, m->trans_global,
+	       m->trans_local);
+
+	if (mpc_record >= MAX_MPC_ENTRY)
+		printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
+	else
+		translation_table[mpc_record] = m;	/* stash this for later */
+	if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
+		node_set_online(m->trans_quad);
+}
+
+/*
+ * Read/parse the MPC oem tables
+ */
+
+static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
+				    unsigned short oemsize)
+{
+	int count = sizeof(*oemtable);	/* the header size */
+	unsigned char *oemptr = ((unsigned char *)oemtable) + count;
+
+	mpc_record = 0;
+	printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
+	       oemtable);
+	if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
+		printk(KERN_WARNING
+		       "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
+		       oemtable->oem_signature[0], oemtable->oem_signature[1],
+		       oemtable->oem_signature[2], oemtable->oem_signature[3]);
+		return;
+	}
+	if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
+		printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
+		return;
+	}
+	while (count < oemtable->oem_length) {
+		switch (*oemptr) {
+		case MP_TRANSLATION:
+			{
+				struct mpc_config_translation *m =
+				    (struct mpc_config_translation *)oemptr;
+				MP_translation_info(m);
+				oemptr += sizeof(*m);
+				count += sizeof(*m);
+				++mpc_record;
+				break;
+			}
+		default:
+			{
+				printk(KERN_WARNING
+				       "Unrecognised OEM table entry type! - %d\n",
+				       (int)*oemptr);
+				return;
+			}
+		}
+	}
+}
+
+static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
+				 char *productid)
+{
+	if (strncmp(oem, "IBM NUMA", 8))
+		printk("Warning!  May not be a NUMA-Q system!\n");
+	if (mpc->mpc_oemptr)
+		smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
+				 mpc->mpc_oemsize);
+}
+#endif /* CONFIG_X86_NUMAQ */
+
+/*
+ * Read/parse the MPC
+ */
+
+static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
+{
+	char str[16];
+	char oem[10];
+	int count = sizeof(*mpc);
+	unsigned char *mpt = ((unsigned char *)mpc) + count;
+
+	if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
+		printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
+		       mpc->mpc_signature[0], mpc->mpc_signature[1],
+		       mpc->mpc_signature[2], mpc->mpc_signature[3]);
+		return 0;
+	}
+	if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
+		printk(KERN_ERR "MPTABLE: checksum error!\n");
+		return 0;
+	}
+	if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
+		printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
+		       mpc->mpc_spec);
+		return 0;
+	}
+	if (!mpc->mpc_lapic) {
+		printk(KERN_ERR "MPTABLE: null local APIC address!\n");
+		return 0;
+	}
+	memcpy(oem, mpc->mpc_oem, 8);
+	oem[8] = 0;
+	printk(KERN_INFO "MPTABLE: OEM ID: %s ", oem);
+
+	memcpy(str, mpc->mpc_productid, 12);
+	str[12] = 0;
+	printk("Product ID: %s ", str);
+
+#ifdef CONFIG_X86_32
+	mps_oem_check(mpc, oem, str);
+#endif
+	printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
+
+	printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
+
+	/* save the local APIC address, it might be non-default */
+	if (!acpi_lapic)
+		mp_lapic_addr = mpc->mpc_lapic;
+
+	if (early)
+		return 1;
+
+	/*
+	 *      Now process the configuration blocks.
+	 */
+#ifdef CONFIG_X86_NUMAQ
+	mpc_record = 0;
+#endif
+	while (count < mpc->mpc_length) {
+		switch (*mpt) {
+		case MP_PROCESSOR:
+			{
+				struct mpc_config_processor *m =
+				    (struct mpc_config_processor *)mpt;
+				/* ACPI may have already provided this data */
+				if (!acpi_lapic)
+					MP_processor_info(m);
+				mpt += sizeof(*m);
+				count += sizeof(*m);
+				break;
+			}
+		case MP_BUS:
+			{
+				struct mpc_config_bus *m =
+				    (struct mpc_config_bus *)mpt;
+				MP_bus_info(m);
+				mpt += sizeof(*m);
+				count += sizeof(*m);
+				break;
+			}
+		case MP_IOAPIC:
+			{
+#ifdef CONFIG_X86_IO_APIC
+				struct mpc_config_ioapic *m =
+				    (struct mpc_config_ioapic *)mpt;
+				MP_ioapic_info(m);
+#endif
+				mpt += sizeof(struct mpc_config_ioapic);
+				count += sizeof(struct mpc_config_ioapic);
+				break;
+			}
+		case MP_INTSRC:
+			{
+#ifdef CONFIG_X86_IO_APIC
+				struct mpc_config_intsrc *m =
+				    (struct mpc_config_intsrc *)mpt;
+
+				MP_intsrc_info(m);
+#endif
+				mpt += sizeof(struct mpc_config_intsrc);
+				count += sizeof(struct mpc_config_intsrc);
+				break;
+			}
+		case MP_LINTSRC:
+			{
+				struct mpc_config_lintsrc *m =
+				    (struct mpc_config_lintsrc *)mpt;
+				MP_lintsrc_info(m);
+				mpt += sizeof(*m);
+				count += sizeof(*m);
+				break;
+			}
+		default:
+			{
+				count = mpc->mpc_length;
+				break;
+			}
+		}
+#ifdef CONFIG_X86_NUMAQ
+		++mpc_record;
+#endif
+	}
+	setup_apic_routing();
+	if (!num_processors)
+		printk(KERN_ERR "MPTABLE: no processors registered!\n");
+	return num_processors;
+}
+
+#ifdef CONFIG_X86_IO_APIC
+
+static int __init ELCR_trigger(unsigned int irq)
+{
+	unsigned int port;
+
+	port = 0x4d0 + (irq >> 3);
+	return (inb(port) >> (irq & 7)) & 1;
+}
+
+static void __init construct_default_ioirq_mptable(int mpc_default_type)
+{
+	struct mpc_config_intsrc intsrc;
+	int i;
+	int ELCR_fallback = 0;
+
+	intsrc.mpc_type = MP_INTSRC;
+	intsrc.mpc_irqflag = 0;	/* conforming */
+	intsrc.mpc_srcbus = 0;
+	intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
+
+	intsrc.mpc_irqtype = mp_INT;
+
+	/*
+	 *  If true, we have an ISA/PCI system with no IRQ entries
+	 *  in the MP table. To prevent the PCI interrupts from being set up
+	 *  incorrectly, we try to use the ELCR. The sanity check to see if
+	 *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
+	 *  never be level sensitive, so we simply see if the ELCR agrees.
+	 *  If it does, we assume it's valid.
+	 */
+	if (mpc_default_type == 5) {
+		printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
+		       "falling back to ELCR\n");
+
+		if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
+		    ELCR_trigger(13))
+			printk(KERN_ERR "ELCR contains invalid data... "
+			       "not using ELCR\n");
+		else {
+			printk(KERN_INFO
+			       "Using ELCR to identify PCI interrupts\n");
+			ELCR_fallback = 1;
+		}
+	}
+
+	for (i = 0; i < 16; i++) {
+		switch (mpc_default_type) {
+		case 2:
+			if (i == 0 || i == 13)
+				continue;	/* IRQ0 & IRQ13 not connected */
+			/* fall through */
+		default:
+			if (i == 2)
+				continue;	/* IRQ2 is never connected */
+		}
+
+		if (ELCR_fallback) {
+			/*
+			 *  If the ELCR indicates a level-sensitive interrupt, we
+			 *  copy that information over to the MP table in the
+			 *  irqflag field (level sensitive, active high polarity).
+			 */
+			if (ELCR_trigger(i))
+				intsrc.mpc_irqflag = 13;
+			else
+				intsrc.mpc_irqflag = 0;
+		}
+
+		intsrc.mpc_srcbusirq = i;
+		intsrc.mpc_dstirq = i ? i : 2;	/* IRQ0 to INTIN2 */
+		MP_intsrc_info(&intsrc);
+	}
+
+	intsrc.mpc_irqtype = mp_ExtINT;
+	intsrc.mpc_srcbusirq = 0;
+	intsrc.mpc_dstirq = 0;	/* 8259A to INTIN0 */
+	MP_intsrc_info(&intsrc);
+}
+
+#endif
+
+static inline void __init construct_default_ISA_mptable(int mpc_default_type)
+{
+	struct mpc_config_processor processor;
+	struct mpc_config_bus bus;
+#ifdef CONFIG_X86_IO_APIC
+	struct mpc_config_ioapic ioapic;
+#endif
+	struct mpc_config_lintsrc lintsrc;
+	int linttypes[2] = { mp_ExtINT, mp_NMI };
+	int i;
+
+	/*
+	 * local APIC has default address
+	 */
+	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+
+	/*
+	 * 2 CPUs, numbered 0 & 1.
+	 */
+	processor.mpc_type = MP_PROCESSOR;
+	/* Either an integrated APIC or a discrete 82489DX. */
+	processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
+	processor.mpc_cpuflag = CPU_ENABLED;
+	processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
+	    (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
+	processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
+	processor.mpc_reserved[0] = 0;
+	processor.mpc_reserved[1] = 0;
+	for (i = 0; i < 2; i++) {
+		processor.mpc_apicid = i;
+		MP_processor_info(&processor);
+	}
+
+	bus.mpc_type = MP_BUS;
+	bus.mpc_busid = 0;
+	switch (mpc_default_type) {
+	default:
+		printk(KERN_ERR "???\nUnknown standard configuration %d\n",
+		       mpc_default_type);
+		/* fall through */
+	case 1:
+	case 5:
+		memcpy(bus.mpc_bustype, "ISA   ", 6);
+		break;
+	case 2:
+	case 6:
+	case 3:
+		memcpy(bus.mpc_bustype, "EISA  ", 6);
+		break;
+	case 4:
+	case 7:
+		memcpy(bus.mpc_bustype, "MCA   ", 6);
+	}
+	MP_bus_info(&bus);
+	if (mpc_default_type > 4) {
+		bus.mpc_busid = 1;
+		memcpy(bus.mpc_bustype, "PCI   ", 6);
+		MP_bus_info(&bus);
+	}
+
+#ifdef CONFIG_X86_IO_APIC
+	ioapic.mpc_type = MP_IOAPIC;
+	ioapic.mpc_apicid = 2;
+	ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
+	ioapic.mpc_flags = MPC_APIC_USABLE;
+	ioapic.mpc_apicaddr = 0xFEC00000;
+	MP_ioapic_info(&ioapic);
+
+	/*
+	 * We set up most of the low 16 IO-APIC pins according to MPS rules.
+	 */
+	construct_default_ioirq_mptable(mpc_default_type);
+#endif
+	lintsrc.mpc_type = MP_LINTSRC;
+	lintsrc.mpc_irqflag = 0;	/* conforming */
+	lintsrc.mpc_srcbusid = 0;
+	lintsrc.mpc_srcbusirq = 0;
+	lintsrc.mpc_destapic = MP_APIC_ALL;
+	for (i = 0; i < 2; i++) {
+		lintsrc.mpc_irqtype = linttypes[i];
+		lintsrc.mpc_destapiclint = i;
+		MP_lintsrc_info(&lintsrc);
+	}
+}
+
+static struct intel_mp_floating *mpf_found;
+
+/*
+ * Scan the memory blocks for an SMP configuration block.
+ */
+static void __init __get_smp_config(unsigned early)
+{
+	struct intel_mp_floating *mpf = mpf_found;
+
+	if (acpi_lapic && early)
+		return;
+	/*
+	 * ACPI supports both logical (e.g. Hyper-Threading) and physical
+	 * processors, where MPS only supports physical.
+	 */
+	if (acpi_lapic && acpi_ioapic) {
+		printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
+		       "information\n");
+		return;
+	} else if (acpi_lapic)
+		printk(KERN_INFO "Using ACPI for processor (LAPIC) "
+		       "configuration information\n");
+
+	printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
+	       mpf->mpf_specification);
+#ifdef CONFIG_X86_32
+	if (mpf->mpf_feature2 & (1 << 7)) {
+		printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
+		pic_mode = 1;
+	} else {
+		printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
+		pic_mode = 0;
+	}
+#endif
+	/*
+	 * Now see if we need to read further.
+	 */
+	if (mpf->mpf_feature1 != 0) {
+		if (early) {
+			/*
+			 * local APIC has default address
+			 */
+			mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+			return;
+		}
+
+		printk(KERN_INFO "Default MP configuration #%d\n",
+		       mpf->mpf_feature1);
+		construct_default_ISA_mptable(mpf->mpf_feature1);
+
+	} else if (mpf->mpf_physptr) {
+
+		/*
+		 * Read the physical hardware table.  Anything here will
+		 * override the defaults.
+		 */
+		if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
+			smp_found_config = 0;
+			printk(KERN_ERR
+			       "BIOS bug, MP table errors detected!...\n");
+			printk(KERN_ERR "... disabling SMP support. "
+			       "(tell your hw vendor)\n");
+			return;
+		}
+
+		if (early)
+			return;
+#ifdef CONFIG_X86_IO_APIC
+		/*
+		 * If there are no explicit MP IRQ entries, then we are
+		 * broken.  We set up most of the low 16 IO-APIC pins to
+		 * ISA defaults and hope it will work.
+		 */
+		if (!mp_irq_entries) {
+			struct mpc_config_bus bus;
+
+			printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
+			       "using default mptable. "
+			       "(tell your hw vendor)\n");
+
+			bus.mpc_type = MP_BUS;
+			bus.mpc_busid = 0;
+			memcpy(bus.mpc_bustype, "ISA   ", 6);
+			MP_bus_info(&bus);
+
+			construct_default_ioirq_mptable(0);
+		}
+#endif
+	} else
+		BUG();
+
+	if (!early)
+		printk(KERN_INFO "Processors: %d\n", num_processors);
+	/*
+	 * Only use the first configuration found.
+	 */
+}
+
+void __init early_get_smp_config(void)
+{
+	__get_smp_config(1);
+}
+
+void __init get_smp_config(void)
+{
+	__get_smp_config(0);
+}
+
+static int __init smp_scan_config(unsigned long base, unsigned long length,
+				  unsigned reserve)
+{
+	extern void __bad_mpf_size(void);
+	unsigned int *bp = phys_to_virt(base);
+	struct intel_mp_floating *mpf;
+
+	Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
+	if (sizeof(*mpf) != 16)
+		__bad_mpf_size();
+
+	while (length > 0) {
+		mpf = (struct intel_mp_floating *)bp;
+		if ((*bp == SMP_MAGIC_IDENT) &&
+		    (mpf->mpf_length == 1) &&
+		    !mpf_checksum((unsigned char *)bp, 16) &&
+		    ((mpf->mpf_specification == 1)
+		     || (mpf->mpf_specification == 4))) {
+
+			smp_found_config = 1;
+			mpf_found = mpf;
+#ifdef CONFIG_X86_32
+			printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
+			       mpf, virt_to_phys(mpf));
+			reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
+					BOOTMEM_DEFAULT);
+			if (mpf->mpf_physptr) {
+				/*
+				 * We cannot access to MPC table to compute
+				 * table size yet, as only few megabytes from
+				 * the bottom is mapped now.
+				 * PC-9800's MPC table places on the very last
+				 * of physical memory; so that simply reserving
+				 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
+				 * in reserve_bootmem.
+				 */
+				unsigned long size = PAGE_SIZE;
+				unsigned long end = max_low_pfn * PAGE_SIZE;
+				if (mpf->mpf_physptr + size > end)
+					size = end - mpf->mpf_physptr;
+				reserve_bootmem(mpf->mpf_physptr, size,
+						BOOTMEM_DEFAULT);
+			}
+
+#else
+			if (!reserve)
+				return 1;
+
+			reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
+			if (mpf->mpf_physptr)
+				reserve_bootmem_generic(mpf->mpf_physptr,
+							PAGE_SIZE);
+#endif
+		return 1;
+		}
+		bp += 4;
+		length -= 16;
+	}
+	return 0;
+}
+
+static void __init __find_smp_config(unsigned reserve)
+{
+	unsigned int address;
+
+	/*
+	 * FIXME: Linux assumes you have 640K of base ram..
+	 * this continues the error...
+	 *
+	 * 1) Scan the bottom 1K for a signature
+	 * 2) Scan the top 1K of base RAM
+	 * 3) Scan the 64K of bios
+	 */
+	if (smp_scan_config(0x0, 0x400, reserve) ||
+	    smp_scan_config(639 * 0x400, 0x400, reserve) ||
+	    smp_scan_config(0xF0000, 0x10000, reserve))
+		return;
+	/*
+	 * If it is an SMP machine we should know now, unless the
+	 * configuration is in an EISA/MCA bus machine with an
+	 * extended bios data area.
+	 *
+	 * there is a real-mode segmented pointer pointing to the
+	 * 4K EBDA area at 0x40E, calculate and scan it here.
+	 *
+	 * NOTE! There are Linux loaders that will corrupt the EBDA
+	 * area, and as such this kind of SMP config may be less
+	 * trustworthy, simply because the SMP table may have been
+	 * stomped on during early boot. These loaders are buggy and
+	 * should be fixed.
+	 *
+	 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
+	 */
+
+	address = get_bios_ebda();
+	if (address)
+		smp_scan_config(address, 0x400, reserve);
+}
+
+void __init early_find_smp_config(void)
+{
+	__find_smp_config(0);
+}
+
+void __init find_smp_config(void)
+{
+	__find_smp_config(1);
+}
+
+/* --------------------------------------------------------------------------
+                            ACPI-based MP Configuration
+   -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI
+
+#ifdef	CONFIG_X86_IO_APIC
+
+#define MP_ISA_BUS		0
+#define MP_MAX_IOAPIC_PIN	127
+
+extern struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
+
+static int mp_find_ioapic(int gsi)
+{
+	int i = 0;
+
+	/* Find the IOAPIC that manages this GSI. */
+	for (i = 0; i < nr_ioapics; i++) {
+		if ((gsi >= mp_ioapic_routing[i].gsi_base)
+		    && (gsi <= mp_ioapic_routing[i].gsi_end))
+			return i;
+	}
+
+	printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
+	return -1;
+}
+
+static u8 uniq_ioapic_id(u8 id)
+{
+#ifdef CONFIG_X86_32
+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+	    !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
+		return io_apic_get_unique_id(nr_ioapics, id);
+	else
+		return id;
+#else
+	int i;
+	DECLARE_BITMAP(used, 256);
+	bitmap_zero(used, 256);
+	for (i = 0; i < nr_ioapics; i++) {
+		struct mpc_config_ioapic *ia = &mp_ioapics[i];
+		__set_bit(ia->mpc_apicid, used);
+	}
+	if (!test_bit(id, used))
+		return id;
+	return find_first_zero_bit(used, 256);
+#endif
+}
+
+void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
+{
+	int idx = 0;
+
+	if (bad_ioapic(address))
+		return;
+
+	idx = nr_ioapics;
+
+	mp_ioapics[idx].mpc_type = MP_IOAPIC;
+	mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
+	mp_ioapics[idx].mpc_apicaddr = address;
+
+	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
+	mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
+#ifdef CONFIG_X86_32
+	mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
+#else
+	mp_ioapics[idx].mpc_apicver = 0;
+#endif
+	/*
+	 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
+	 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
+	 */
+	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
+	mp_ioapic_routing[idx].gsi_base = gsi_base;
+	mp_ioapic_routing[idx].gsi_end = gsi_base +
+	    io_apic_get_redir_entries(idx);
+
+	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
+	       "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
+	       mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
+	       mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
+
+	nr_ioapics++;
+}
+
+void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
+{
+	struct mpc_config_intsrc intsrc;
+	int ioapic = -1;
+	int pin = -1;
+
+	/*
+	 * Convert 'gsi' to 'ioapic.pin'.
+	 */
+	ioapic = mp_find_ioapic(gsi);
+	if (ioapic < 0)
+		return;
+	pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
+
+	/*
+	 * TBD: This check is for faulty timer entries, where the override
+	 *      erroneously sets the trigger to level, resulting in a HUGE
+	 *      increase of timer interrupts!
+	 */
+	if ((bus_irq == 0) && (trigger == 3))
+		trigger = 1;
+
+	intsrc.mpc_type = MP_INTSRC;
+	intsrc.mpc_irqtype = mp_INT;
+	intsrc.mpc_irqflag = (trigger << 2) | polarity;
+	intsrc.mpc_srcbus = MP_ISA_BUS;
+	intsrc.mpc_srcbusirq = bus_irq;	/* IRQ */
+	intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;	/* APIC ID */
+	intsrc.mpc_dstirq = pin;	/* INTIN# */
+
+	Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
+		intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
+		(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
+		intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
+
+	mp_irqs[mp_irq_entries] = intsrc;
+	if (++mp_irq_entries == MAX_IRQ_SOURCES)
+		panic("Max # of irq sources exceeded!\n");
+}
+
+int es7000_plat;
+
+void __init mp_config_acpi_legacy_irqs(void)
+{
+	struct mpc_config_intsrc intsrc;
+	int i = 0;
+	int ioapic = -1;
+
+#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
+	/*
+	 * Fabricate the legacy ISA bus (bus #31).
+	 */
+	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
+#endif
+	set_bit(MP_ISA_BUS, mp_bus_not_pci);
+	Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
+
+	/*
+	 * Older generations of ES7000 have no legacy identity mappings
+	 */
+	if (es7000_plat == 1)
+		return;
+
+	/*
+	 * Locate the IOAPIC that manages the ISA IRQs (0-15).
+	 */
+	ioapic = mp_find_ioapic(0);
+	if (ioapic < 0)
+		return;
+
+	intsrc.mpc_type = MP_INTSRC;
+	intsrc.mpc_irqflag = 0;	/* Conforming */
+	intsrc.mpc_srcbus = MP_ISA_BUS;
+#ifdef CONFIG_X86_IO_APIC
+	intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
+#endif
+	/*
+	 * Use the default configuration for the IRQs 0-15.  Unless
+	 * overridden by (MADT) interrupt source override entries.
+	 */
+	for (i = 0; i < 16; i++) {
+		int idx;
+
+		for (idx = 0; idx < mp_irq_entries; idx++) {
+			struct mpc_config_intsrc *irq = mp_irqs + idx;
+
+			/* Do we already have a mapping for this ISA IRQ? */
+			if (irq->mpc_srcbus == MP_ISA_BUS
+			    && irq->mpc_srcbusirq == i)
+				break;
+
+			/* Do we already have a mapping for this IOAPIC pin */
+			if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
+			    (irq->mpc_dstirq == i))
+				break;
+		}
+
+		if (idx != mp_irq_entries) {
+			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
+			continue;	/* IRQ already used */
+		}
+
+		intsrc.mpc_irqtype = mp_INT;
+		intsrc.mpc_srcbusirq = i;	/* Identity mapped */
+		intsrc.mpc_dstirq = i;
+
+		Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
+			"%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
+			(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
+			intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
+			intsrc.mpc_dstirq);
+
+		mp_irqs[mp_irq_entries] = intsrc;
+		if (++mp_irq_entries == MAX_IRQ_SOURCES)
+			panic("Max # of irq sources exceeded!\n");
+	}
+}
+
+int mp_register_gsi(u32 gsi, int triggering, int polarity)
+{
+	int ioapic = -1;
+	int ioapic_pin = 0;
+	int idx, bit = 0;
+#ifdef CONFIG_X86_32
+#define MAX_GSI_NUM	4096
+#define IRQ_COMPRESSION_START	64
+
+	static int pci_irq = IRQ_COMPRESSION_START;
+	/*
+	 * Mapping between Global System Interrupts, which
+	 * represent all possible interrupts, and IRQs
+	 * assigned to actual devices.
+	 */
+	static int gsi_to_irq[MAX_GSI_NUM];
+#else
+
+	if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
+		return gsi;
+#endif
+
+	/* Don't set up the ACPI SCI because it's already set up */
+	if (acpi_gbl_FADT.sci_interrupt == gsi)
+		return gsi;
+
+	ioapic = mp_find_ioapic(gsi);
+	if (ioapic < 0) {
+		printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
+		return gsi;
+	}
+
+	ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
+
+#ifdef CONFIG_X86_32
+	if (ioapic_renumber_irq)
+		gsi = ioapic_renumber_irq(ioapic, gsi);
+#endif
+
+	/*
+	 * Avoid pin reprogramming.  PRTs typically include entries
+	 * with redundant pin->gsi mappings (but unique PCI devices);
+	 * we only program the IOAPIC on the first.
+	 */
+	bit = ioapic_pin % 32;
+	idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
+	if (idx > 3) {
+		printk(KERN_ERR "Invalid reference to IOAPIC pin "
+		       "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
+		       ioapic_pin);
+		return gsi;
+	}
+	if ((1 << bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
+		Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
+			mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
+#ifdef CONFIG_X86_32
+		return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
+#else
+		return gsi;
+#endif
+	}
+
+	mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1 << bit);
+#ifdef CONFIG_X86_32
+	/*
+	 * For GSI >= 64, use IRQ compression
+	 */
+	if ((gsi >= IRQ_COMPRESSION_START)
+	    && (triggering == ACPI_LEVEL_SENSITIVE)) {
+		/*
+		 * For PCI devices assign IRQs in order, avoiding gaps
+		 * due to unused I/O APIC pins.
+		 */
+		int irq = gsi;
+		if (gsi < MAX_GSI_NUM) {
+			/*
+			 * Retain the VIA chipset work-around (gsi > 15), but
+			 * avoid a problem where the 8254 timer (IRQ0) is setup
+			 * via an override (so it's not on pin 0 of the ioapic),
+			 * and at the same time, the pin 0 interrupt is a PCI
+			 * type.  The gsi > 15 test could cause these two pins
+			 * to be shared as IRQ0, and they are not shareable.
+			 * So test for this condition, and if necessary, avoid
+			 * the pin collision.
+			 */
+			gsi = pci_irq++;
+			/*
+			 * Don't assign IRQ used by ACPI SCI
+			 */
+			if (gsi == acpi_gbl_FADT.sci_interrupt)
+				gsi = pci_irq++;
+			gsi_to_irq[irq] = gsi;
+		} else {
+			printk(KERN_ERR "GSI %u is too high\n", gsi);
+			return gsi;
+		}
+	}
+#endif
+	io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
+				triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
+				polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
+	return gsi;
+}
+
+#endif /* CONFIG_X86_IO_APIC */
+#endif /* CONFIG_ACPI */