2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/bootmem.h>
14 #include <linux/memblock.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/mc146818rtc.h>
17 #include <linux/bitops.h>
18 #include <linux/acpi.h>
19 #include <linux/module.h>
20 #include <linux/smp.h>
21 #include <linux/pci.h>
24 #include <asm/mpspec.h>
25 #include <asm/pgalloc.h>
26 #include <asm/io_apic.h>
27 #include <asm/proto.h>
28 #include <asm/bios_ebda.h>
30 #include <asm/setup.h>
35 * Checksum an MP configuration block.
38 static int __init mpf_checksum(unsigned char *mp, int len)
48 int __init default_mpc_apic_id(struct mpc_cpu *m)
53 static void __init MP_processor_info(struct mpc_cpu *m)
56 char *bootup_cpu = "";
58 if (!(m->cpuflag & CPU_ENABLED)) {
63 apicid = x86_init.mpparse.mpc_apic_id(m);
65 if (m->cpuflag & CPU_BOOTPROCESSOR) {
66 bootup_cpu = " (Bootup-CPU)";
67 boot_cpu_physical_apicid = m->apicid;
70 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
71 generic_processor_info(apicid, m->apicver);
74 #ifdef CONFIG_X86_IO_APIC
75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
77 memcpy(str, m->bustype, 6);
79 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
82 static void __init MP_bus_info(struct mpc_bus *m)
86 x86_init.mpparse.mpc_oem_bus_info(m, str);
88 #if MAX_MP_BUSSES < 256
89 if (m->busid >= MAX_MP_BUSSES) {
90 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
91 " is too large, max. supported is %d\n",
92 m->busid, str, MAX_MP_BUSSES - 1);
97 set_bit(m->busid, mp_bus_not_pci);
98 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
100 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
102 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
103 if (x86_init.mpparse.mpc_oem_pci_bus)
104 x86_init.mpparse.mpc_oem_pci_bus(m);
106 clear_bit(m->busid, mp_bus_not_pci);
108 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
109 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
110 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
113 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
116 static void __init MP_ioapic_info(struct mpc_ioapic *m)
118 if (m->flags & MPC_APIC_USABLE)
119 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
122 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
124 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
125 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
126 mp_irq->irqtype, mp_irq->irqflag & 3,
127 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
128 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
131 #else /* CONFIG_X86_IO_APIC */
132 static inline void __init MP_bus_info(struct mpc_bus *m) {}
133 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
134 #endif /* CONFIG_X86_IO_APIC */
136 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
138 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
139 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
140 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
141 m->srcbusirq, m->destapic, m->destapiclint);
147 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
150 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
151 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
152 mpc->signature[0], mpc->signature[1],
153 mpc->signature[2], mpc->signature[3]);
156 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
157 printk(KERN_ERR "MPTABLE: checksum error!\n");
160 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
161 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
166 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
169 memcpy(oem, mpc->oem, 8);
171 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
173 memcpy(str, mpc->productid, 12);
176 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
178 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
183 static void skip_entry(unsigned char **ptr, int *count, int size)
189 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
191 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
193 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
194 1, mpc, mpc->length, 1);
197 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
199 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
204 int count = sizeof(*mpc);
205 unsigned char *mpt = ((unsigned char *)mpc) + count;
207 if (!smp_check_mpc(mpc, oem, str))
211 generic_mps_oem_check(mpc, oem, str);
213 /* Initialize the lapic mapping */
215 register_lapic_address(mpc->lapic);
221 x86_init.mpparse.smp_read_mpc_oem(mpc);
224 * Now process the configuration blocks.
226 x86_init.mpparse.mpc_record(0);
228 while (count < mpc->length) {
231 /* ACPI may have already provided this data */
233 MP_processor_info((struct mpc_cpu *)mpt);
234 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
237 MP_bus_info((struct mpc_bus *)mpt);
238 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
241 MP_ioapic_info((struct mpc_ioapic *)mpt);
242 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
245 mp_save_irq((struct mpc_intsrc *)mpt);
246 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
249 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
250 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
254 smp_dump_mptable(mpc, mpt);
258 x86_init.mpparse.mpc_record(1);
262 printk(KERN_ERR "MPTABLE: no processors registered!\n");
263 return num_processors;
266 #ifdef CONFIG_X86_IO_APIC
268 static int __init ELCR_trigger(unsigned int irq)
272 port = 0x4d0 + (irq >> 3);
273 return (inb(port) >> (irq & 7)) & 1;
276 static void __init construct_default_ioirq_mptable(int mpc_default_type)
278 struct mpc_intsrc intsrc;
280 int ELCR_fallback = 0;
282 intsrc.type = MP_INTSRC;
283 intsrc.irqflag = 0; /* conforming */
285 intsrc.dstapic = mpc_ioapic_id(0);
287 intsrc.irqtype = mp_INT;
290 * If true, we have an ISA/PCI system with no IRQ entries
291 * in the MP table. To prevent the PCI interrupts from being set up
292 * incorrectly, we try to use the ELCR. The sanity check to see if
293 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
294 * never be level sensitive, so we simply see if the ELCR agrees.
295 * If it does, we assume it's valid.
297 if (mpc_default_type == 5) {
298 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
299 "falling back to ELCR\n");
301 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
303 printk(KERN_ERR "ELCR contains invalid data... "
307 "Using ELCR to identify PCI interrupts\n");
312 for (i = 0; i < 16; i++) {
313 switch (mpc_default_type) {
315 if (i == 0 || i == 13)
316 continue; /* IRQ0 & IRQ13 not connected */
320 continue; /* IRQ2 is never connected */
325 * If the ELCR indicates a level-sensitive interrupt, we
326 * copy that information over to the MP table in the
327 * irqflag field (level sensitive, active high polarity).
335 intsrc.srcbusirq = i;
336 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
337 mp_save_irq(&intsrc);
340 intsrc.irqtype = mp_ExtINT;
341 intsrc.srcbusirq = 0;
342 intsrc.dstirq = 0; /* 8259A to INTIN0 */
343 mp_save_irq(&intsrc);
347 static void __init construct_ioapic_table(int mpc_default_type)
349 struct mpc_ioapic ioapic;
354 switch (mpc_default_type) {
356 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
361 memcpy(bus.bustype, "ISA ", 6);
366 memcpy(bus.bustype, "EISA ", 6);
370 if (mpc_default_type > 4) {
372 memcpy(bus.bustype, "PCI ", 6);
376 ioapic.type = MP_IOAPIC;
378 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
379 ioapic.flags = MPC_APIC_USABLE;
380 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
381 MP_ioapic_info(&ioapic);
384 * We set up most of the low 16 IO-APIC pins according to MPS rules.
386 construct_default_ioirq_mptable(mpc_default_type);
389 static inline void __init construct_ioapic_table(int mpc_default_type) { }
392 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
394 struct mpc_cpu processor;
395 struct mpc_lintsrc lintsrc;
396 int linttypes[2] = { mp_ExtINT, mp_NMI };
400 * local APIC has default address
402 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
405 * 2 CPUs, numbered 0 & 1.
407 processor.type = MP_PROCESSOR;
408 /* Either an integrated APIC or a discrete 82489DX. */
409 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
410 processor.cpuflag = CPU_ENABLED;
411 processor.cpufeature = (boot_cpu_data.x86 << 8) |
412 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
413 processor.featureflag = boot_cpu_data.x86_capability[0];
414 processor.reserved[0] = 0;
415 processor.reserved[1] = 0;
416 for (i = 0; i < 2; i++) {
417 processor.apicid = i;
418 MP_processor_info(&processor);
421 construct_ioapic_table(mpc_default_type);
423 lintsrc.type = MP_LINTSRC;
424 lintsrc.irqflag = 0; /* conforming */
425 lintsrc.srcbusid = 0;
426 lintsrc.srcbusirq = 0;
427 lintsrc.destapic = MP_APIC_ALL;
428 for (i = 0; i < 2; i++) {
429 lintsrc.irqtype = linttypes[i];
430 lintsrc.destapiclint = i;
431 MP_lintsrc_info(&lintsrc);
435 static struct mpf_intel *mpf_found;
437 static unsigned long __init get_mpc_size(unsigned long physptr)
439 struct mpc_table *mpc;
442 mpc = early_ioremap(physptr, PAGE_SIZE);
444 early_iounmap(mpc, PAGE_SIZE);
445 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
450 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
452 struct mpc_table *mpc;
455 size = get_mpc_size(mpf->physptr);
456 mpc = early_ioremap(mpf->physptr, size);
458 * Read the physical hardware table. Anything here will
459 * override the defaults.
461 if (!smp_read_mpc(mpc, early)) {
462 #ifdef CONFIG_X86_LOCAL_APIC
463 smp_found_config = 0;
465 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
466 "... disabling SMP support. (tell your hw vendor)\n");
467 early_iounmap(mpc, size);
470 early_iounmap(mpc, size);
475 #ifdef CONFIG_X86_IO_APIC
477 * If there are no explicit MP IRQ entries, then we are
478 * broken. We set up most of the low 16 IO-APIC pins to
479 * ISA defaults and hope it will work.
481 if (!mp_irq_entries) {
484 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
485 "using default mptable. (tell your hw vendor)\n");
489 memcpy(bus.bustype, "ISA ", 6);
492 construct_default_ioirq_mptable(0);
500 * Scan the memory blocks for an SMP configuration block.
502 void __init default_get_smp_config(unsigned int early)
504 struct mpf_intel *mpf = mpf_found;
509 if (acpi_lapic && early)
513 * MPS doesn't support hyperthreading, aka only have
514 * thread 0 apic id in MPS table
516 if (acpi_lapic && acpi_ioapic)
519 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
521 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
522 if (mpf->feature2 & (1 << 7)) {
523 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
526 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
531 * Now see if we need to read further.
533 if (mpf->feature1 != 0) {
536 * local APIC has default address
538 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
542 printk(KERN_INFO "Default MP configuration #%d\n",
544 construct_default_ISA_mptable(mpf->feature1);
546 } else if (mpf->physptr) {
547 if (check_physptr(mpf, early))
553 printk(KERN_INFO "Processors: %d\n", num_processors);
555 * Only use the first configuration found.
559 static void __init smp_reserve_memory(struct mpf_intel *mpf)
561 memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
564 static int __init smp_scan_config(unsigned long base, unsigned long length)
566 unsigned int *bp = phys_to_virt(base);
567 struct mpf_intel *mpf;
570 apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
571 base, base + length - 1);
572 BUILD_BUG_ON(sizeof(*mpf) != 16);
575 mpf = (struct mpf_intel *)bp;
576 if ((*bp == SMP_MAGIC_IDENT) &&
577 (mpf->length == 1) &&
578 !mpf_checksum((unsigned char *)bp, 16) &&
579 ((mpf->specification == 1)
580 || (mpf->specification == 4))) {
581 #ifdef CONFIG_X86_LOCAL_APIC
582 smp_found_config = 1;
586 printk(KERN_INFO "found SMP MP-table at [mem %#010llx-%#010llx] mapped at [%p]\n",
587 (unsigned long long) virt_to_phys(mpf),
588 (unsigned long long) virt_to_phys(mpf) +
589 sizeof(*mpf) - 1, mpf);
591 mem = virt_to_phys(mpf);
592 memblock_reserve(mem, sizeof(*mpf));
594 smp_reserve_memory(mpf);
604 void __init default_find_smp_config(void)
606 unsigned int address;
609 * FIXME: Linux assumes you have 640K of base ram..
610 * this continues the error...
612 * 1) Scan the bottom 1K for a signature
613 * 2) Scan the top 1K of base RAM
614 * 3) Scan the 64K of bios
616 if (smp_scan_config(0x0, 0x400) ||
617 smp_scan_config(639 * 0x400, 0x400) ||
618 smp_scan_config(0xF0000, 0x10000))
621 * If it is an SMP machine we should know now, unless the
622 * configuration is in an EISA bus machine with an
623 * extended bios data area.
625 * there is a real-mode segmented pointer pointing to the
626 * 4K EBDA area at 0x40E, calculate and scan it here.
628 * NOTE! There are Linux loaders that will corrupt the EBDA
629 * area, and as such this kind of SMP config may be less
630 * trustworthy, simply because the SMP table may have been
631 * stomped on during early boot. These loaders are buggy and
634 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
637 address = get_bios_ebda();
639 smp_scan_config(address, 0x400);
642 #ifdef CONFIG_X86_IO_APIC
643 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
645 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
649 if (m->irqtype != mp_INT)
652 if (m->irqflag != 0x0f)
657 for (i = 0; i < mp_irq_entries; i++) {
658 if (mp_irqs[i].irqtype != mp_INT)
661 if (mp_irqs[i].irqflag != 0x0f)
664 if (mp_irqs[i].srcbus != m->srcbus)
666 if (mp_irqs[i].srcbusirq != m->srcbusirq)
669 /* already claimed */
680 #define SPARE_SLOT_NUM 20
682 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
684 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
688 apic_printk(APIC_VERBOSE, "OLD ");
689 print_mp_irq_info(m);
691 i = get_MP_intsrc_index(m);
693 memcpy(m, &mp_irqs[i], sizeof(*m));
694 apic_printk(APIC_VERBOSE, "NEW ");
695 print_mp_irq_info(&mp_irqs[i]);
699 /* legacy, do nothing */
702 if (*nr_m_spare < SPARE_SLOT_NUM) {
704 * not found (-1), or duplicated (-2) are invalid entries,
705 * we need to use the slot later
707 m_spare[*nr_m_spare] = m;
713 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
715 if (!mpc_new_phys || count <= mpc_new_length) {
716 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
722 #else /* CONFIG_X86_IO_APIC */
724 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
725 #endif /* CONFIG_X86_IO_APIC */
727 static int __init replace_intsrc_all(struct mpc_table *mpc,
728 unsigned long mpc_new_phys,
729 unsigned long mpc_new_length)
731 #ifdef CONFIG_X86_IO_APIC
734 int count = sizeof(*mpc);
736 unsigned char *mpt = ((unsigned char *)mpc) + count;
738 printk(KERN_INFO "mpc_length %x\n", mpc->length);
739 while (count < mpc->length) {
742 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
745 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
748 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
751 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
752 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
755 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
759 smp_dump_mptable(mpc, mpt);
764 #ifdef CONFIG_X86_IO_APIC
765 for (i = 0; i < mp_irq_entries; i++) {
769 if (mp_irqs[i].irqtype != mp_INT)
772 if (mp_irqs[i].irqflag != 0x0f)
775 if (nr_m_spare > 0) {
776 apic_printk(APIC_VERBOSE, "*NEW* found\n");
778 memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
779 m_spare[nr_m_spare] = NULL;
781 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
782 count += sizeof(struct mpc_intsrc);
783 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
785 memcpy(m, &mp_irqs[i], sizeof(*m));
787 mpt += sizeof(struct mpc_intsrc);
789 print_mp_irq_info(&mp_irqs[i]);
793 /* update checksum */
795 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
800 int enable_update_mptable;
802 static int __init update_mptable_setup(char *str)
804 enable_update_mptable = 1;
810 early_param("update_mptable", update_mptable_setup);
812 static unsigned long __initdata mpc_new_phys;
813 static unsigned long mpc_new_length __initdata = 4096;
815 /* alloc_mptable or alloc_mptable=4k */
816 static int __initdata alloc_mptable;
817 static int __init parse_alloc_mptable_opt(char *p)
819 enable_update_mptable = 1;
826 mpc_new_length = memparse(p, &p);
829 early_param("alloc_mptable", parse_alloc_mptable_opt);
831 void __init early_reserve_e820_mpc_new(void)
833 if (enable_update_mptable && alloc_mptable)
834 mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
837 static int __init update_mp_table(void)
841 struct mpf_intel *mpf;
842 struct mpc_table *mpc, *mpc_new;
844 if (!enable_update_mptable)
852 * Now see if we need to go further.
854 if (mpf->feature1 != 0)
860 mpc = phys_to_virt(mpf->physptr);
862 if (!smp_check_mpc(mpc, oem, str))
865 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
866 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
868 if (mpc_new_phys && mpc->length > mpc_new_length) {
870 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
875 unsigned char old, new;
876 /* check if we can change the position */
878 old = mpf_checksum((unsigned char *)mpc, mpc->length);
879 mpc->checksum = 0xff;
880 new = mpf_checksum((unsigned char *)mpc, mpc->length);
882 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
885 printk(KERN_INFO "use in-position replacing\n");
887 mpf->physptr = mpc_new_phys;
888 mpc_new = phys_to_virt(mpc_new_phys);
889 memcpy(mpc_new, mpc, mpc->length);
891 /* check if we can modify that */
892 if (mpc_new_phys - mpf->physptr) {
893 struct mpf_intel *mpf_new;
894 /* steal 16 bytes from [0, 1k) */
895 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
896 mpf_new = phys_to_virt(0x400 - 16);
897 memcpy(mpf_new, mpf, 16);
899 mpf->physptr = mpc_new_phys;
902 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
903 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
907 * only replace the one with mp_INT and
908 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
909 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
910 * may need pci=routeirq for all coverage
912 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
917 late_initcall(update_mp_table);