mpparse.c
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上传日期:2013-02-24
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文件大小:21k
- /*
- * Intel Multiprocessor Specificiation 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
- */
- #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 <asm/smp.h>
- #include <asm/mtrr.h>
- #include <asm/mpspec.h>
- #include <asm/pgalloc.h>
- /* Have we found an MP table */
- int smp_found_config;
- /*
- * Various Linux-internal data structures created from the
- * MP-table.
- */
- int apic_version [MAX_APICS];
- int mp_bus_id_to_type [MAX_MP_BUSSES];
- int mp_bus_id_to_node [MAX_MP_BUSSES];
- int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
- 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;
- unsigned long mp_lapic_addr;
- /* Processor that is doing the boot up */
- unsigned int boot_cpu_physical_apicid = -1U;
- unsigned int boot_cpu_logical_apicid = -1U;
- /* Internal processor count */
- static unsigned int num_processors;
- /* Bitmask of physically existing CPUs */
- unsigned long phys_cpu_present_map;
- /*
- * Intel MP BIOS table parsing routines:
- */
- #ifndef CONFIG_X86_VISWS_APIC
- /*
- * 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;
- }
- /*
- * Processor encoding in an MP configuration block
- */
- static char __init *mpc_family(int family,int model)
- {
- static char n[32];
- static char *model_defs[]=
- {
- "80486DX","80486DX",
- "80486SX","80486DX/2 or 80487",
- "80486SL","80486SX/2",
- "Unknown","80486DX/2-WB",
- "80486DX/4","80486DX/4-WB"
- };
- switch (family) {
- case 0x04:
- if (model < 10)
- return model_defs[model];
- break;
- case 0x05:
- return("Pentium(tm)");
- case 0x06:
- return("Pentium(tm) Pro");
- case 0x0F:
- if (model == 0x00)
- return("Pentium 4(tm)");
- if (model == 0x0F)
- return("Special controller");
- }
- sprintf(n,"Unknown CPU [%d:%d]",family, model);
- return n;
- }
- #ifdef CONFIG_X86_IO_APIC
- extern int have_acpi_tables; /* set by acpitable.c */
- #else
- #define have_acpi_tables (0)
- #endif
- /*
- * 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] __initdata;
- void __init MP_processor_info (struct mpc_config_processor *m)
- {
- int ver, quad, logical_apicid;
-
- if (!(m->mpc_cpuflag & CPU_ENABLED))
- return;
- logical_apicid = m->mpc_apicid;
- if (clustered_apic_mode) {
- quad = translation_table[mpc_record]->trans_quad;
- logical_apicid = (quad << 4) +
- (m->mpc_apicid ? m->mpc_apicid << 1 : 1);
- printk("Processor #%d %s APIC version %d (quad %d, apic %d)n",
- m->mpc_apicid,
- mpc_family((m->mpc_cpufeature & CPU_FAMILY_MASK)>>8 ,
- (m->mpc_cpufeature & CPU_MODEL_MASK)>>4),
- m->mpc_apicver, quad, logical_apicid);
- } else {
- printk("Processor #%d %s APIC version %dn",
- m->mpc_apicid,
- mpc_family((m->mpc_cpufeature & CPU_FAMILY_MASK)>>8 ,
- (m->mpc_cpufeature & CPU_MODEL_MASK)>>4),
- m->mpc_apicver);
- }
- if (m->mpc_featureflag&(1<<0))
- Dprintk(" Floating point unit present.n");
- if (m->mpc_featureflag&(1<<7))
- Dprintk(" Machine Exception supported.n");
- if (m->mpc_featureflag&(1<<8))
- Dprintk(" 64 bit compare & exchange supported.n");
- if (m->mpc_featureflag&(1<<9))
- Dprintk(" Internal APIC present.n");
- if (m->mpc_featureflag&(1<<11))
- Dprintk(" SEP present.n");
- if (m->mpc_featureflag&(1<<12))
- Dprintk(" MTRR present.n");
- if (m->mpc_featureflag&(1<<13))
- Dprintk(" PGE present.n");
- if (m->mpc_featureflag&(1<<14))
- Dprintk(" MCA present.n");
- if (m->mpc_featureflag&(1<<15))
- Dprintk(" CMOV present.n");
- if (m->mpc_featureflag&(1<<16))
- Dprintk(" PAT present.n");
- if (m->mpc_featureflag&(1<<17))
- Dprintk(" PSE present.n");
- if (m->mpc_featureflag&(1<<18))
- Dprintk(" PSN present.n");
- if (m->mpc_featureflag&(1<<19))
- Dprintk(" Cache Line Flush Instruction present.n");
- /* 20 Reserved */
- if (m->mpc_featureflag&(1<<21))
- Dprintk(" Debug Trace and EMON Store present.n");
- if (m->mpc_featureflag&(1<<22))
- Dprintk(" ACPI Thermal Throttle Registers present.n");
- if (m->mpc_featureflag&(1<<23))
- Dprintk(" MMX present.n");
- if (m->mpc_featureflag&(1<<24))
- Dprintk(" FXSR present.n");
- if (m->mpc_featureflag&(1<<25))
- Dprintk(" XMM present.n");
- if (m->mpc_featureflag&(1<<26))
- Dprintk(" Willamette New Instructions present.n");
- if (m->mpc_featureflag&(1<<27))
- Dprintk(" Self Snoop present.n");
- if (m->mpc_featureflag&(1<<28))
- Dprintk(" HT present.n");
- if (m->mpc_featureflag&(1<<29))
- Dprintk(" Thermal Monitor present.n");
- /* 30, 31 Reserved */
- if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
- Dprintk(" Bootup CPUn");
- boot_cpu_physical_apicid = m->mpc_apicid;
- boot_cpu_logical_apicid = logical_apicid;
- }
- num_processors++;
- if (m->mpc_apicid > MAX_APICS) {
- printk("Processor #%d INVALID. (Max ID: %d).n",
- m->mpc_apicid, MAX_APICS);
- return;
- }
- ver = m->mpc_apicver;
- if (clustered_apic_mode) {
- phys_cpu_present_map |= (logical_apicid&0xf) << (4*quad);
- } else {
- phys_cpu_present_map |= 1 << m->mpc_apicid;
- }
- /*
- * Validate version
- */
- if (ver == 0x0) {
- printk("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;
- }
- static void __init MP_bus_info (struct mpc_config_bus *m)
- {
- char str[7];
- memcpy(str, m->mpc_bustype, 6);
- str[6] = 0;
-
- if (clustered_apic_mode) {
- mp_bus_id_to_node[m->mpc_busid] = translation_table[mpc_record]->trans_quad;
- printk("Bus #%d is %s (node %d)n", m->mpc_busid, str, mp_bus_id_to_node[m->mpc_busid]);
- } else {
- Dprintk("Bus #%d is %sn", m->mpc_busid, str);
- }
- if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
- mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
- } 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_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
- mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
- mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
- mp_current_pci_id++;
- } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
- mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
- } else {
- printk("Unknown bustype %s - ignoringn", str);
- }
- }
- static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
- {
- if (!(m->mpc_flags & MPC_APIC_USABLE))
- return;
- printk("I/O APIC #%d Version %d at 0x%lX.n",
- m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
- if (nr_ioapics >= MAX_IO_APICS) {
- printk("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 (!m->mpc_apicaddr) {
- printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
- " found in MP table, skipping!n");
- 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 %02xn",
- 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");
- }
- 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 %02xn",
- m->mpc_irqtype, m->mpc_irqflag & 3,
- (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
- m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
- /*
- * Well it seems all SMP boards in existence
- * use ExtINT/LVT1 == LINT0 and
- * NMI/LVT2 == LINT1 - the following check
- * will show us if this assumptions is false.
- * Until then we do not have to add baggage.
- */
- if ((m->mpc_irqtype == mp_ExtINT) &&
- (m->mpc_destapiclint != 0))
- BUG();
- if ((m->mpc_irqtype == mp_NMI) &&
- (m->mpc_destapiclint != 1))
- BUG();
- }
- static void __init MP_translation_info (struct mpc_config_translation *m)
- {
- printk("Translation: record %d, type %d, quad %d, global %d, local %dn", mpc_record, m->trans_type,
- m->trans_quad, m->trans_global, m->trans_local);
- if (mpc_record >= MAX_MPC_ENTRY)
- printk("MAX_MPC_ENTRY exceeded!n");
- else
- translation_table[mpc_record] = m; /* stash this for later */
- }
- /*
- * 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;
-
- printk("Found an OEM MPC table at %8p - parsing it ... n", oemtable);
- if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
- {
- printk("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("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("Unrecognised OEM table entry type! - %dn", (int) *oemptr);
- return;
- }
- }
- }
- }
- /*
- * Read/parse the MPC
- */
- static int __init smp_read_mpc(struct mp_config_table *mpc)
- {
- char str[16];
- int count=sizeof(*mpc);
- unsigned char *mpt=((unsigned char *)mpc)+count;
- if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
- panic("SMP 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)) {
- panic("SMP mptable: checksum error!n");
- return 0;
- }
- if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
- printk(KERN_ERR "SMP mptable: bad table version (%d)!!n",
- mpc->mpc_spec);
- return 0;
- }
- if (!mpc->mpc_lapic) {
- printk(KERN_ERR "SMP mptable: null local APIC address!n");
- return 0;
- }
- memcpy(str,mpc->mpc_oem,8);
- str[8]=0;
- printk("OEM ID: %s ",str);
- memcpy(str,mpc->mpc_productid,12);
- str[12]=0;
- printk("Product ID: %s ",str);
- printk("APIC at: 0x%lXn",mpc->mpc_lapic);
- /* save the local APIC address, it might be non-default,
- * but only if we're not using the ACPI tables
- */
- if (!have_acpi_tables)
- mp_lapic_addr = mpc->mpc_lapic;
- if (clustered_apic_mode && mpc->mpc_oemptr) {
- /* We need to process the oem mpc tables to tell us which quad things are in ... */
- mpc_record = 0;
- smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr, mpc->mpc_oemsize);
- mpc_record = 0;
- }
- /*
- * Now process the configuration blocks.
- */
- while (count < mpc->mpc_length) {
- switch(*mpt) {
- case MP_PROCESSOR:
- {
- struct mpc_config_processor *m=
- (struct mpc_config_processor *)mpt;
- /* ACPI may already have provided this one for us */
- if (!have_acpi_tables)
- 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:
- {
- struct mpc_config_ioapic *m=
- (struct mpc_config_ioapic *)mpt;
- MP_ioapic_info(m);
- mpt+=sizeof(*m);
- count+=sizeof(*m);
- break;
- }
- case MP_INTSRC:
- {
- struct mpc_config_intsrc *m=
- (struct mpc_config_intsrc *)mpt;
- MP_intsrc_info(m);
- mpt+=sizeof(*m);
- count+=sizeof(*m);
- 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;
- }
- }
- ++mpc_record;
- }
- if (clustered_apic_mode && nr_ioapics > 2) {
- /* don't initialise IO apics on secondary quads */
- nr_ioapics = 2;
- }
- if (!num_processors)
- printk(KERN_ERR "SMP mptable: no processors registered!n");
- return num_processors;
- }
- 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("ISA/PCI bus type with no IRQ information... falling back to ELCRn");
- if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
- printk("ELCR contains invalid data... not using ELCRn");
- else {
- printk("Using ELCR to identify PCI interruptsn");
- 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);
- }
- static inline void __init construct_default_ISA_mptable(int mpc_default_type)
- {
- struct mpc_config_processor processor;
- struct mpc_config_bus bus;
- struct mpc_config_ioapic ioapic;
- 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("???nUnknown standard configuration %dn",
- 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);
- }
- 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);
- 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;
- extern void config_acpi_tables(void);
- /*
- * Scan the memory blocks for an SMP configuration block.
- */
- void __init get_smp_config (void)
- {
- struct intel_mp_floating *mpf = mpf_found;
- #ifdef CONFIG_X86_IO_APIC
- /*
- * Check if the ACPI tables are provided. Use them only to get
- * the processor information, mainly because it provides
- * the info on the logical processor(s), rather than the physical
- * processor(s) that are provided by the MPS. We attempt to
- * check only if the user provided a commandline override
- */
- config_acpi_tables();
- #endif
-
- printk("Intel MultiProcessor Specification v1.%dn", mpf->mpf_specification);
- if (mpf->mpf_feature2 & (1<<7)) {
- printk(" IMCR and PIC compatibility mode.n");
- pic_mode = 1;
- } else {
- printk(" Virtual Wire compatibility mode.n");
- pic_mode = 0;
- }
- /*
- * Now see if we need to read further.
- */
- if (mpf->mpf_feature1 != 0) {
- printk("Default MP configuration #%dn", 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((void *)mpf->mpf_physptr)) {
- 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 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("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);
- }
- } else
- BUG();
- printk("Processors: %dn", num_processors);
- /*
- * Only use the first configuration found.
- */
- }
- static int __init smp_scan_config (unsigned long base, unsigned long length)
- {
- unsigned long *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)
- printk("Error: MPF sizen");
- 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;
- printk("found SMP MP-table at %08lxn",
- virt_to_phys(mpf));
- reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
- if (mpf->mpf_physptr)
- reserve_bootmem(mpf->mpf_physptr, PAGE_SIZE);
- mpf_found = mpf;
- return 1;
- }
- bp += 4;
- length -= 16;
- }
- return 0;
- }
- void __init find_intel_smp (void)
- {
- 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) ||
- smp_scan_config(639*0x400,0x400) ||
- smp_scan_config(0xF0000,0x10000))
- 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.
- */
- address = *(unsigned short *)phys_to_virt(0x40E);
- address <<= 4;
- smp_scan_config(address, 0x1000);
- if (smp_found_config)
- printk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@vger.kernel.org if you experience SMP problems!n");
- }
- #else
- /*
- * The Visual Workstation is Intel MP compliant in the hardware
- * sense, but it doesnt have a BIOS(-configuration table).
- * No problem for Linux.
- */
- void __init find_visws_smp(void)
- {
- smp_found_config = 1;
- phys_cpu_present_map |= 2; /* or in id 1 */
- apic_version[1] |= 0x10; /* integrated APIC */
- apic_version[0] |= 0x10;
- mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
- }
- #endif
- /*
- * - Intel MP Configuration Table
- * - or SGI Visual Workstation configuration
- */
- void __init find_smp_config (void)
- {
- #ifdef CONFIG_X86_LOCAL_APIC
- find_intel_smp();
- #endif
- #ifdef CONFIG_VISWS
- find_visws_smp();
- #endif
- }