2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
5 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
6 * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
7 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/bootmem.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/mc146818rtc.h>
16 #include <linux/bitops.h>
17 #include <linux/acpi.h>
18 #include <linux/module.h>
22 #include <asm/mpspec.h>
23 #include <asm/pgalloc.h>
24 #include <asm/io_apic.h>
25 #include <asm/proto.h>
27 #include <asm/bios_ebda.h>
29 #include <asm/trampoline.h>
31 #include <mach_apic.h>
33 #include <mach_apicdef.h>
34 #include <mach_mpparse.h>
37 int enable_update_mptable;
40 * Checksum an MP configuration block.
43 static int __init mpf_checksum(unsigned char *mp, int len)
53 #ifdef CONFIG_X86_NUMAQ
56 * Have to match translation table entries to main table entries by counter
57 * hence the mpc_record variable .... can't see a less disgusting way of
60 struct mpc_config_translation {
61 unsigned char mpc_type;
62 unsigned char trans_len;
63 unsigned char trans_type;
64 unsigned char trans_quad;
65 unsigned char trans_global;
66 unsigned char trans_local;
67 unsigned short trans_reserved;
71 static int mpc_record;
72 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
75 static inline int generate_logical_apicid(int quad, int phys_apicid)
77 return (quad << 4) + (phys_apicid ? phys_apicid << 1 : 1);
81 static inline int mpc_apic_id(struct mpc_config_processor *m,
82 struct mpc_config_translation *translation_record)
84 int quad = translation_record->trans_quad;
85 int logical_apicid = generate_logical_apicid(quad, m->mpc_apicid);
87 printk(KERN_DEBUG "Processor #%d %u:%u APIC version %d (quad %d, apic %d)\n",
89 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
90 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
91 m->mpc_apicver, quad, logical_apicid);
92 return logical_apicid;
95 int mp_bus_id_to_node[MAX_MP_BUSSES];
97 int mp_bus_id_to_local[MAX_MP_BUSSES];
99 static void mpc_oem_bus_info(struct mpc_config_bus *m, char *name,
100 struct mpc_config_translation *translation)
102 int quad = translation->trans_quad;
103 int local = translation->trans_local;
105 mp_bus_id_to_node[m->mpc_busid] = quad;
106 mp_bus_id_to_local[m->mpc_busid] = local;
107 printk(KERN_INFO "Bus #%d is %s (node %d)\n",
108 m->mpc_busid, name, quad);
111 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
112 static void mpc_oem_pci_bus(struct mpc_config_bus *m,
113 struct mpc_config_translation *translation)
115 int quad = translation->trans_quad;
116 int local = translation->trans_local;
118 quad_local_to_mp_bus_id[quad][local] = m->mpc_busid;
123 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
126 char *bootup_cpu = "";
128 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
132 #ifdef CONFIG_X86_NUMAQ
134 apicid = mpc_apic_id(m, translation_table[mpc_record]);
136 apicid = m->mpc_apicid;
138 apicid = m->mpc_apicid;
140 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
141 bootup_cpu = " (Bootup-CPU)";
142 boot_cpu_physical_apicid = m->mpc_apicid;
145 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
146 generic_processor_info(apicid, m->mpc_apicver);
149 #ifdef CONFIG_X86_IO_APIC
150 static void __init MP_bus_info(struct mpc_config_bus *m)
153 memcpy(str, m->mpc_bustype, 6);
156 #ifdef CONFIG_X86_NUMAQ
158 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
160 printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
163 #if MAX_MP_BUSSES < 256
164 if (m->mpc_busid >= MAX_MP_BUSSES) {
165 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
166 " is too large, max. supported is %d\n",
167 m->mpc_busid, str, MAX_MP_BUSSES - 1);
172 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
173 set_bit(m->mpc_busid, mp_bus_not_pci);
174 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
175 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
177 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
178 #ifdef CONFIG_X86_NUMAQ
180 mpc_oem_pci_bus(m, translation_table[mpc_record]);
182 clear_bit(m->mpc_busid, mp_bus_not_pci);
183 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
184 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
185 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
186 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
187 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
188 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
191 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
195 #ifdef CONFIG_X86_IO_APIC
197 static int bad_ioapic(unsigned long address)
199 if (nr_ioapics >= MAX_IO_APICS) {
200 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
201 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
202 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
205 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
206 " found in table, skipping!\n");
212 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
214 if (!(m->mpc_flags & MPC_APIC_USABLE))
217 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
218 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
220 if (bad_ioapic(m->mpc_apicaddr))
223 mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
224 mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
225 mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
226 mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
227 mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
231 static void print_MP_intsrc_info(struct mpc_config_intsrc *m)
233 printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
234 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
235 m->mpc_irqtype, m->mpc_irqflag & 3,
236 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
237 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
240 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
242 printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
243 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
244 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
245 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
246 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
249 static void assign_to_mp_irq(struct mpc_config_intsrc *m,
250 struct mp_config_intsrc *mp_irq)
252 mp_irq->mp_dstapic = m->mpc_dstapic;
253 mp_irq->mp_type = m->mpc_type;
254 mp_irq->mp_irqtype = m->mpc_irqtype;
255 mp_irq->mp_irqflag = m->mpc_irqflag;
256 mp_irq->mp_srcbus = m->mpc_srcbus;
257 mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
258 mp_irq->mp_dstirq = m->mpc_dstirq;
261 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
262 struct mpc_config_intsrc *m)
264 m->mpc_dstapic = mp_irq->mp_dstapic;
265 m->mpc_type = mp_irq->mp_type;
266 m->mpc_irqtype = mp_irq->mp_irqtype;
267 m->mpc_irqflag = mp_irq->mp_irqflag;
268 m->mpc_srcbus = mp_irq->mp_srcbus;
269 m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
270 m->mpc_dstirq = mp_irq->mp_dstirq;
273 static int mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
274 struct mpc_config_intsrc *m)
276 if (mp_irq->mp_dstapic != m->mpc_dstapic)
278 if (mp_irq->mp_type != m->mpc_type)
280 if (mp_irq->mp_irqtype != m->mpc_irqtype)
282 if (mp_irq->mp_irqflag != m->mpc_irqflag)
284 if (mp_irq->mp_srcbus != m->mpc_srcbus)
286 if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
288 if (mp_irq->mp_dstirq != m->mpc_dstirq)
294 void MP_intsrc_info(struct mpc_config_intsrc *m)
298 print_MP_intsrc_info(m);
300 if (enable_update_mptable)
301 for (i = 0; i < mp_irq_entries; i++) {
302 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
306 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
307 if (++mp_irq_entries == MAX_IRQ_SOURCES)
308 panic("Max # of irq sources exceeded!!\n");
313 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
315 printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
316 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
317 m->mpc_irqtype, m->mpc_irqflag & 3,
318 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
319 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
322 #ifdef CONFIG_X86_NUMAQ
323 static void __init MP_translation_info(struct mpc_config_translation *m)
326 "Translation: record %d, type %d, quad %d, global %d, local %d\n",
327 mpc_record, m->trans_type, m->trans_quad, m->trans_global,
330 if (mpc_record >= MAX_MPC_ENTRY)
331 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
333 translation_table[mpc_record] = m; /* stash this for later */
334 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
335 node_set_online(m->trans_quad);
339 * Read/parse the MPC oem tables
342 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
343 unsigned short oemsize)
345 int count = sizeof(*oemtable); /* the header size */
346 unsigned char *oemptr = ((unsigned char *)oemtable) + count;
349 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
351 if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
353 "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
354 oemtable->oem_signature[0], oemtable->oem_signature[1],
355 oemtable->oem_signature[2], oemtable->oem_signature[3]);
358 if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
359 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
362 while (count < oemtable->oem_length) {
366 struct mpc_config_translation *m =
367 (struct mpc_config_translation *)oemptr;
368 MP_translation_info(m);
369 oemptr += sizeof(*m);
377 "Unrecognised OEM table entry type! - %d\n",
385 void numaq_mps_oem_check(struct mp_config_table *mpc, char *oem,
388 if (strncmp(oem, "IBM NUMA", 8))
389 printk("Warning! Not a NUMA-Q system!\n");
394 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
397 #endif /* CONFIG_X86_NUMAQ */
403 static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
407 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
408 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
409 mpc->mpc_signature[0], mpc->mpc_signature[1],
410 mpc->mpc_signature[2], mpc->mpc_signature[3]);
413 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
414 printk(KERN_ERR "MPTABLE: checksum error!\n");
417 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
418 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
422 if (!mpc->mpc_lapic) {
423 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
426 memcpy(oem, mpc->mpc_oem, 8);
428 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
430 memcpy(str, mpc->mpc_productid, 12);
433 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
435 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
440 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
445 int count = sizeof(*mpc);
446 unsigned char *mpt = ((unsigned char *)mpc) + count;
448 if (!smp_check_mpc(mpc, oem, str))
453 * need to make sure summit and es7000's mps_oem_check is safe to be
454 * called early via genericarch 's mps_oem_check
457 #ifdef CONFIG_X86_NUMAQ
458 numaq_mps_oem_check(mpc, oem, str);
461 mps_oem_check(mpc, oem, str);
464 /* save the local APIC address, it might be non-default */
466 mp_lapic_addr = mpc->mpc_lapic;
472 * Now process the configuration blocks.
474 #ifdef CONFIG_X86_NUMAQ
477 while (count < mpc->mpc_length) {
481 struct mpc_config_processor *m =
482 (struct mpc_config_processor *)mpt;
483 /* ACPI may have already provided this data */
485 MP_processor_info(m);
492 struct mpc_config_bus *m =
493 (struct mpc_config_bus *)mpt;
494 #ifdef CONFIG_X86_IO_APIC
503 #ifdef CONFIG_X86_IO_APIC
504 struct mpc_config_ioapic *m =
505 (struct mpc_config_ioapic *)mpt;
508 mpt += sizeof(struct mpc_config_ioapic);
509 count += sizeof(struct mpc_config_ioapic);
514 #ifdef CONFIG_X86_IO_APIC
515 struct mpc_config_intsrc *m =
516 (struct mpc_config_intsrc *)mpt;
520 mpt += sizeof(struct mpc_config_intsrc);
521 count += sizeof(struct mpc_config_intsrc);
526 struct mpc_config_lintsrc *m =
527 (struct mpc_config_lintsrc *)mpt;
535 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
536 printk(KERN_ERR "type %x\n", *mpt);
537 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
538 1, mpc, mpc->mpc_length, 1);
539 count = mpc->mpc_length;
542 #ifdef CONFIG_X86_NUMAQ
547 #ifdef CONFIG_X86_GENERICARCH
548 generic_bigsmp_probe();
551 setup_apic_routing();
553 printk(KERN_ERR "MPTABLE: no processors registered!\n");
554 return num_processors;
557 #ifdef CONFIG_X86_IO_APIC
559 static int __init ELCR_trigger(unsigned int irq)
563 port = 0x4d0 + (irq >> 3);
564 return (inb(port) >> (irq & 7)) & 1;
567 static void __init construct_default_ioirq_mptable(int mpc_default_type)
569 struct mpc_config_intsrc intsrc;
571 int ELCR_fallback = 0;
573 intsrc.mpc_type = MP_INTSRC;
574 intsrc.mpc_irqflag = 0; /* conforming */
575 intsrc.mpc_srcbus = 0;
576 intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
578 intsrc.mpc_irqtype = mp_INT;
581 * If true, we have an ISA/PCI system with no IRQ entries
582 * in the MP table. To prevent the PCI interrupts from being set up
583 * incorrectly, we try to use the ELCR. The sanity check to see if
584 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
585 * never be level sensitive, so we simply see if the ELCR agrees.
586 * If it does, we assume it's valid.
588 if (mpc_default_type == 5) {
589 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
590 "falling back to ELCR\n");
592 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
594 printk(KERN_ERR "ELCR contains invalid data... "
598 "Using ELCR to identify PCI interrupts\n");
603 for (i = 0; i < 16; i++) {
604 switch (mpc_default_type) {
606 if (i == 0 || i == 13)
607 continue; /* IRQ0 & IRQ13 not connected */
611 continue; /* IRQ2 is never connected */
616 * If the ELCR indicates a level-sensitive interrupt, we
617 * copy that information over to the MP table in the
618 * irqflag field (level sensitive, active high polarity).
621 intsrc.mpc_irqflag = 13;
623 intsrc.mpc_irqflag = 0;
626 intsrc.mpc_srcbusirq = i;
627 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
628 MP_intsrc_info(&intsrc);
631 intsrc.mpc_irqtype = mp_ExtINT;
632 intsrc.mpc_srcbusirq = 0;
633 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
634 MP_intsrc_info(&intsrc);
638 static void construct_ioapic_table(int mpc_default_type)
640 struct mpc_config_ioapic ioapic;
641 struct mpc_config_bus bus;
643 bus.mpc_type = MP_BUS;
645 switch (mpc_default_type) {
647 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
652 memcpy(bus.mpc_bustype, "ISA ", 6);
657 memcpy(bus.mpc_bustype, "EISA ", 6);
661 memcpy(bus.mpc_bustype, "MCA ", 6);
664 if (mpc_default_type > 4) {
666 memcpy(bus.mpc_bustype, "PCI ", 6);
670 ioapic.mpc_type = MP_IOAPIC;
671 ioapic.mpc_apicid = 2;
672 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
673 ioapic.mpc_flags = MPC_APIC_USABLE;
674 ioapic.mpc_apicaddr = 0xFEC00000;
675 MP_ioapic_info(&ioapic);
678 * We set up most of the low 16 IO-APIC pins according to MPS rules.
680 construct_default_ioirq_mptable(mpc_default_type);
683 static inline void construct_ioapic_table(int mpc_default_type) { }
686 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
688 struct mpc_config_processor processor;
689 struct mpc_config_lintsrc lintsrc;
690 int linttypes[2] = { mp_ExtINT, mp_NMI };
694 * local APIC has default address
696 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
699 * 2 CPUs, numbered 0 & 1.
701 processor.mpc_type = MP_PROCESSOR;
702 /* Either an integrated APIC or a discrete 82489DX. */
703 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
704 processor.mpc_cpuflag = CPU_ENABLED;
705 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
706 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
707 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
708 processor.mpc_reserved[0] = 0;
709 processor.mpc_reserved[1] = 0;
710 for (i = 0; i < 2; i++) {
711 processor.mpc_apicid = i;
712 MP_processor_info(&processor);
715 construct_ioapic_table(mpc_default_type);
717 lintsrc.mpc_type = MP_LINTSRC;
718 lintsrc.mpc_irqflag = 0; /* conforming */
719 lintsrc.mpc_srcbusid = 0;
720 lintsrc.mpc_srcbusirq = 0;
721 lintsrc.mpc_destapic = MP_APIC_ALL;
722 for (i = 0; i < 2; i++) {
723 lintsrc.mpc_irqtype = linttypes[i];
724 lintsrc.mpc_destapiclint = i;
725 MP_lintsrc_info(&lintsrc);
729 static struct intel_mp_floating *mpf_found;
732 * Scan the memory blocks for an SMP configuration block.
734 static void __init __get_smp_config(unsigned early)
736 struct intel_mp_floating *mpf = mpf_found;
738 if (acpi_lapic && early)
741 * ACPI supports both logical (e.g. Hyper-Threading) and physical
742 * processors, where MPS only supports physical.
744 if (acpi_lapic && acpi_ioapic) {
745 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
748 } else if (acpi_lapic)
749 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
750 "configuration information\n");
752 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
753 mpf->mpf_specification);
754 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
755 if (mpf->mpf_feature2 & (1 << 7)) {
756 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
759 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
764 * Now see if we need to read further.
766 if (mpf->mpf_feature1 != 0) {
769 * local APIC has default address
771 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
775 printk(KERN_INFO "Default MP configuration #%d\n",
777 construct_default_ISA_mptable(mpf->mpf_feature1);
779 } else if (mpf->mpf_physptr) {
782 * Read the physical hardware table. Anything here will
783 * override the defaults.
785 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
786 #ifdef CONFIG_X86_LOCAL_APIC
787 smp_found_config = 0;
790 "BIOS bug, MP table errors detected!...\n");
791 printk(KERN_ERR "... disabling SMP support. "
792 "(tell your hw vendor)\n");
798 #ifdef CONFIG_X86_IO_APIC
800 * If there are no explicit MP IRQ entries, then we are
801 * broken. We set up most of the low 16 IO-APIC pins to
802 * ISA defaults and hope it will work.
804 if (!mp_irq_entries) {
805 struct mpc_config_bus bus;
807 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
808 "using default mptable. "
809 "(tell your hw vendor)\n");
811 bus.mpc_type = MP_BUS;
813 memcpy(bus.mpc_bustype, "ISA ", 6);
816 construct_default_ioirq_mptable(0);
823 printk(KERN_INFO "Processors: %d\n", num_processors);
825 * Only use the first configuration found.
829 void __init early_get_smp_config(void)
834 void __init get_smp_config(void)
839 static int __init smp_scan_config(unsigned long base, unsigned long length,
842 unsigned int *bp = phys_to_virt(base);
843 struct intel_mp_floating *mpf;
845 printk(KERN_DEBUG "Scan SMP from %p for %ld bytes.\n", bp, length);
846 BUILD_BUG_ON(sizeof(*mpf) != 16);
849 mpf = (struct intel_mp_floating *)bp;
850 if ((*bp == SMP_MAGIC_IDENT) &&
851 (mpf->mpf_length == 1) &&
852 !mpf_checksum((unsigned char *)bp, 16) &&
853 ((mpf->mpf_specification == 1)
854 || (mpf->mpf_specification == 4))) {
855 #ifdef CONFIG_X86_LOCAL_APIC
856 smp_found_config = 1;
860 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
861 mpf, virt_to_phys(mpf));
865 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
867 if (mpf->mpf_physptr) {
868 unsigned long size = PAGE_SIZE;
871 * We cannot access to MPC table to compute
872 * table size yet, as only few megabytes from
873 * the bottom is mapped now.
874 * PC-9800's MPC table places on the very last
875 * of physical memory; so that simply reserving
876 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
877 * in reserve_bootmem.
879 unsigned long end = max_low_pfn * PAGE_SIZE;
880 if (mpf->mpf_physptr + size > end)
881 size = end - mpf->mpf_physptr;
883 reserve_bootmem_generic(mpf->mpf_physptr, size,
895 static void __init __find_smp_config(unsigned reserve)
897 unsigned int address;
900 * FIXME: Linux assumes you have 640K of base ram..
901 * this continues the error...
903 * 1) Scan the bottom 1K for a signature
904 * 2) Scan the top 1K of base RAM
905 * 3) Scan the 64K of bios
907 if (smp_scan_config(0x0, 0x400, reserve) ||
908 smp_scan_config(639 * 0x400, 0x400, reserve) ||
909 smp_scan_config(0xF0000, 0x10000, reserve))
912 * If it is an SMP machine we should know now, unless the
913 * configuration is in an EISA/MCA bus machine with an
914 * extended bios data area.
916 * there is a real-mode segmented pointer pointing to the
917 * 4K EBDA area at 0x40E, calculate and scan it here.
919 * NOTE! There are Linux loaders that will corrupt the EBDA
920 * area, and as such this kind of SMP config may be less
921 * trustworthy, simply because the SMP table may have been
922 * stomped on during early boot. These loaders are buggy and
925 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
928 address = get_bios_ebda();
930 smp_scan_config(address, 0x400, reserve);
933 void __init early_find_smp_config(void)
935 __find_smp_config(0);
938 void __init find_smp_config(void)
940 __find_smp_config(1);
943 #ifdef CONFIG_X86_IO_APIC
944 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
946 static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
950 if (m->mpc_irqtype != mp_INT)
953 if (m->mpc_irqflag != 0x0f)
958 for (i = 0; i < mp_irq_entries; i++) {
959 if (mp_irqs[i].mp_irqtype != mp_INT)
962 if (mp_irqs[i].mp_irqflag != 0x0f)
965 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
967 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
970 /* already claimed */
981 #define SPARE_SLOT_NUM 20
983 static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
986 static int __init replace_intsrc_all(struct mp_config_table *mpc,
987 unsigned long mpc_new_phys,
988 unsigned long mpc_new_length)
990 #ifdef CONFIG_X86_IO_APIC
995 int count = sizeof(*mpc);
996 unsigned char *mpt = ((unsigned char *)mpc) + count;
998 printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
999 while (count < mpc->mpc_length) {
1003 struct mpc_config_processor *m =
1004 (struct mpc_config_processor *)mpt;
1006 count += sizeof(*m);
1011 struct mpc_config_bus *m =
1012 (struct mpc_config_bus *)mpt;
1014 count += sizeof(*m);
1019 mpt += sizeof(struct mpc_config_ioapic);
1020 count += sizeof(struct mpc_config_ioapic);
1025 #ifdef CONFIG_X86_IO_APIC
1026 struct mpc_config_intsrc *m =
1027 (struct mpc_config_intsrc *)mpt;
1029 printk(KERN_INFO "OLD ");
1030 print_MP_intsrc_info(m);
1031 i = get_MP_intsrc_index(m);
1033 assign_to_mpc_intsrc(&mp_irqs[i], m);
1034 printk(KERN_INFO "NEW ");
1035 print_mp_irq_info(&mp_irqs[i]);
1037 /* legacy, do nothing */
1038 } else if (nr_m_spare < SPARE_SLOT_NUM) {
1040 * not found (-1), or duplicated (-2)
1041 * are invalid entries,
1042 * we need to use the slot later
1044 m_spare[nr_m_spare] = m;
1048 mpt += sizeof(struct mpc_config_intsrc);
1049 count += sizeof(struct mpc_config_intsrc);
1054 struct mpc_config_lintsrc *m =
1055 (struct mpc_config_lintsrc *)mpt;
1057 count += sizeof(*m);
1062 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
1063 printk(KERN_ERR "type %x\n", *mpt);
1064 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
1065 1, mpc, mpc->mpc_length, 1);
1070 #ifdef CONFIG_X86_IO_APIC
1071 for (i = 0; i < mp_irq_entries; i++) {
1075 if (mp_irqs[i].mp_irqtype != mp_INT)
1078 if (mp_irqs[i].mp_irqflag != 0x0f)
1081 if (nr_m_spare > 0) {
1082 printk(KERN_INFO "*NEW* found ");
1084 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
1085 m_spare[nr_m_spare] = NULL;
1087 struct mpc_config_intsrc *m =
1088 (struct mpc_config_intsrc *)mpt;
1089 count += sizeof(struct mpc_config_intsrc);
1090 if (!mpc_new_phys) {
1091 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
1093 if (count <= mpc_new_length)
1094 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
1096 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
1100 assign_to_mpc_intsrc(&mp_irqs[i], m);
1101 mpc->mpc_length = count;
1102 mpt += sizeof(struct mpc_config_intsrc);
1104 print_mp_irq_info(&mp_irqs[i]);
1108 /* update checksum */
1109 mpc->mpc_checksum = 0;
1110 mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
1116 static int __init update_mptable_setup(char *str)
1118 enable_update_mptable = 1;
1121 early_param("update_mptable", update_mptable_setup);
1123 static unsigned long __initdata mpc_new_phys;
1124 static unsigned long mpc_new_length __initdata = 4096;
1126 /* alloc_mptable or alloc_mptable=4k */
1127 static int __initdata alloc_mptable;
1128 static int __init parse_alloc_mptable_opt(char *p)
1130 enable_update_mptable = 1;
1134 mpc_new_length = memparse(p, &p);
1137 early_param("alloc_mptable", parse_alloc_mptable_opt);
1139 void __init early_reserve_e820_mpc_new(void)
1141 if (enable_update_mptable && alloc_mptable) {
1143 #ifdef CONFIG_X86_TRAMPOLINE
1144 startt = TRAMPOLINE_BASE;
1146 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1150 static int __init update_mp_table(void)
1154 struct intel_mp_floating *mpf;
1155 struct mp_config_table *mpc;
1156 struct mp_config_table *mpc_new;
1158 if (!enable_update_mptable)
1166 * Now see if we need to go further.
1168 if (mpf->mpf_feature1 != 0)
1171 if (!mpf->mpf_physptr)
1174 mpc = phys_to_virt(mpf->mpf_physptr);
1176 if (!smp_check_mpc(mpc, oem, str))
1179 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1180 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1182 if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1184 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1188 if (!mpc_new_phys) {
1189 unsigned char old, new;
1190 /* check if we can change the postion */
1191 mpc->mpc_checksum = 0;
1192 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1193 mpc->mpc_checksum = 0xff;
1194 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1196 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1199 printk(KERN_INFO "use in-positon replacing\n");
1201 mpf->mpf_physptr = mpc_new_phys;
1202 mpc_new = phys_to_virt(mpc_new_phys);
1203 memcpy(mpc_new, mpc, mpc->mpc_length);
1205 /* check if we can modify that */
1206 if (mpc_new_phys - mpf->mpf_physptr) {
1207 struct intel_mp_floating *mpf_new;
1208 /* steal 16 bytes from [0, 1k) */
1209 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1210 mpf_new = phys_to_virt(0x400 - 16);
1211 memcpy(mpf_new, mpf, 16);
1213 mpf->mpf_physptr = mpc_new_phys;
1215 mpf->mpf_checksum = 0;
1216 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1217 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1221 * only replace the one with mp_INT and
1222 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1223 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1224 * may need pci=routeirq for all coverage
1226 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1231 late_initcall(update_mp_table);