2 * Intel Multiprocessor Specification 1.1 and 1.4
3 * compliant MP-table parsing routines.
5 * (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
6 * (c) 1998, 1999, 2000, 2009 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/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/trampoline.h>
31 #include <asm/setup.h>
36 * Checksum an MP configuration block.
39 static int __init mpf_checksum(unsigned char *mp, int len)
49 int __init default_mpc_apic_id(struct mpc_cpu *m)
54 static void __init MP_processor_info(struct mpc_cpu *m)
57 char *bootup_cpu = "";
59 if (!(m->cpuflag & CPU_ENABLED)) {
64 apicid = x86_init.mpparse.mpc_apic_id(m);
66 if (m->cpuflag & CPU_BOOTPROCESSOR) {
67 bootup_cpu = " (Bootup-CPU)";
68 boot_cpu_physical_apicid = m->apicid;
71 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
72 generic_processor_info(apicid, m->apicver);
75 #ifdef CONFIG_X86_IO_APIC
76 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
78 memcpy(str, m->bustype, 6);
80 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
83 static void __init MP_bus_info(struct mpc_bus *m)
87 x86_init.mpparse.mpc_oem_bus_info(m, str);
89 #if MAX_MP_BUSSES < 256
90 if (m->busid >= MAX_MP_BUSSES) {
91 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
92 " is too large, max. supported is %d\n",
93 m->busid, str, MAX_MP_BUSSES - 1);
98 set_bit(m->busid, mp_bus_not_pci);
99 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
101 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
103 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
104 if (x86_init.mpparse.mpc_oem_pci_bus)
105 x86_init.mpparse.mpc_oem_pci_bus(m);
107 clear_bit(m->busid, mp_bus_not_pci);
109 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
110 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
111 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
114 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
117 static void __init MP_ioapic_info(struct mpc_ioapic *m)
119 if (m->flags & MPC_APIC_USABLE)
120 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
123 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
125 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
126 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
127 mp_irq->irqtype, mp_irq->irqflag & 3,
128 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
129 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
132 #else /* CONFIG_X86_IO_APIC */
133 static inline void __init MP_bus_info(struct mpc_bus *m) {}
134 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
135 #endif /* CONFIG_X86_IO_APIC */
137 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
139 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
140 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
141 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
142 m->srcbusirq, m->destapic, m->destapiclint);
148 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
151 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
152 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
153 mpc->signature[0], mpc->signature[1],
154 mpc->signature[2], mpc->signature[3]);
157 if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
158 printk(KERN_ERR "MPTABLE: checksum error!\n");
161 if (mpc->spec != 0x01 && mpc->spec != 0x04) {
162 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
167 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
170 memcpy(oem, mpc->oem, 8);
172 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
174 memcpy(str, mpc->productid, 12);
177 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
179 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
184 static void skip_entry(unsigned char **ptr, int *count, int size)
190 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
192 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
194 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
195 1, mpc, mpc->length, 1);
198 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
200 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
205 int count = sizeof(*mpc);
206 unsigned char *mpt = ((unsigned char *)mpc) + count;
208 if (!smp_check_mpc(mpc, oem, str))
212 generic_mps_oem_check(mpc, oem, str);
214 /* Initialize the lapic mapping */
216 register_lapic_address(mpc->lapic);
222 x86_init.mpparse.smp_read_mpc_oem(mpc);
225 * Now process the configuration blocks.
227 x86_init.mpparse.mpc_record(0);
229 while (count < mpc->length) {
232 /* ACPI may have already provided this data */
234 MP_processor_info((struct mpc_cpu *)mpt);
235 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
238 MP_bus_info((struct mpc_bus *)mpt);
239 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
242 MP_ioapic_info((struct mpc_ioapic *)mpt);
243 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
246 mp_save_irq((struct mpc_intsrc *)mpt);
247 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
250 MP_lintsrc_info((struct mpc_lintsrc *)mpt);
251 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
255 smp_dump_mptable(mpc, mpt);
259 x86_init.mpparse.mpc_record(1);
263 printk(KERN_ERR "MPTABLE: no processors registered!\n");
264 return num_processors;
267 #ifdef CONFIG_X86_IO_APIC
269 static int __init ELCR_trigger(unsigned int irq)
273 port = 0x4d0 + (irq >> 3);
274 return (inb(port) >> (irq & 7)) & 1;
277 static void __init construct_default_ioirq_mptable(int mpc_default_type)
279 struct mpc_intsrc intsrc;
281 int ELCR_fallback = 0;
283 intsrc.type = MP_INTSRC;
284 intsrc.irqflag = 0; /* conforming */
286 intsrc.dstapic = mpc_ioapic_id(0);
288 intsrc.irqtype = mp_INT;
291 * If true, we have an ISA/PCI system with no IRQ entries
292 * in the MP table. To prevent the PCI interrupts from being set up
293 * incorrectly, we try to use the ELCR. The sanity check to see if
294 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
295 * never be level sensitive, so we simply see if the ELCR agrees.
296 * If it does, we assume it's valid.
298 if (mpc_default_type == 5) {
299 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
300 "falling back to ELCR\n");
302 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
304 printk(KERN_ERR "ELCR contains invalid data... "
308 "Using ELCR to identify PCI interrupts\n");
313 for (i = 0; i < 16; i++) {
314 switch (mpc_default_type) {
316 if (i == 0 || i == 13)
317 continue; /* IRQ0 & IRQ13 not connected */
321 continue; /* IRQ2 is never connected */
326 * If the ELCR indicates a level-sensitive interrupt, we
327 * copy that information over to the MP table in the
328 * irqflag field (level sensitive, active high polarity).
336 intsrc.srcbusirq = i;
337 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
338 mp_save_irq(&intsrc);
341 intsrc.irqtype = mp_ExtINT;
342 intsrc.srcbusirq = 0;
343 intsrc.dstirq = 0; /* 8259A to INTIN0 */
344 mp_save_irq(&intsrc);
348 static void __init construct_ioapic_table(int mpc_default_type)
350 struct mpc_ioapic ioapic;
355 switch (mpc_default_type) {
357 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
362 memcpy(bus.bustype, "ISA ", 6);
367 memcpy(bus.bustype, "EISA ", 6);
371 if (mpc_default_type > 4) {
373 memcpy(bus.bustype, "PCI ", 6);
377 ioapic.type = MP_IOAPIC;
379 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
380 ioapic.flags = MPC_APIC_USABLE;
381 ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
382 MP_ioapic_info(&ioapic);
385 * We set up most of the low 16 IO-APIC pins according to MPS rules.
387 construct_default_ioirq_mptable(mpc_default_type);
390 static inline void __init construct_ioapic_table(int mpc_default_type) { }
393 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
395 struct mpc_cpu processor;
396 struct mpc_lintsrc lintsrc;
397 int linttypes[2] = { mp_ExtINT, mp_NMI };
401 * local APIC has default address
403 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
406 * 2 CPUs, numbered 0 & 1.
408 processor.type = MP_PROCESSOR;
409 /* Either an integrated APIC or a discrete 82489DX. */
410 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
411 processor.cpuflag = CPU_ENABLED;
412 processor.cpufeature = (boot_cpu_data.x86 << 8) |
413 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
414 processor.featureflag = boot_cpu_data.x86_capability[0];
415 processor.reserved[0] = 0;
416 processor.reserved[1] = 0;
417 for (i = 0; i < 2; i++) {
418 processor.apicid = i;
419 MP_processor_info(&processor);
422 construct_ioapic_table(mpc_default_type);
424 lintsrc.type = MP_LINTSRC;
425 lintsrc.irqflag = 0; /* conforming */
426 lintsrc.srcbusid = 0;
427 lintsrc.srcbusirq = 0;
428 lintsrc.destapic = MP_APIC_ALL;
429 for (i = 0; i < 2; i++) {
430 lintsrc.irqtype = linttypes[i];
431 lintsrc.destapiclint = i;
432 MP_lintsrc_info(&lintsrc);
436 static struct mpf_intel *mpf_found;
438 static unsigned long __init get_mpc_size(unsigned long physptr)
440 struct mpc_table *mpc;
443 mpc = early_ioremap(physptr, PAGE_SIZE);
445 early_iounmap(mpc, PAGE_SIZE);
446 apic_printk(APIC_VERBOSE, " mpc: %lx-%lx\n", physptr, physptr + size);
451 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
453 struct mpc_table *mpc;
456 size = get_mpc_size(mpf->physptr);
457 mpc = early_ioremap(mpf->physptr, size);
459 * Read the physical hardware table. Anything here will
460 * override the defaults.
462 if (!smp_read_mpc(mpc, early)) {
463 #ifdef CONFIG_X86_LOCAL_APIC
464 smp_found_config = 0;
466 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
467 "... disabling SMP support. (tell your hw vendor)\n");
468 early_iounmap(mpc, size);
471 early_iounmap(mpc, size);
476 #ifdef CONFIG_X86_IO_APIC
478 * If there are no explicit MP IRQ entries, then we are
479 * broken. We set up most of the low 16 IO-APIC pins to
480 * ISA defaults and hope it will work.
482 if (!mp_irq_entries) {
485 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
486 "using default mptable. (tell your hw vendor)\n");
490 memcpy(bus.bustype, "ISA ", 6);
493 construct_default_ioirq_mptable(0);
501 * Scan the memory blocks for an SMP configuration block.
503 void __init default_get_smp_config(unsigned int early)
505 struct mpf_intel *mpf = mpf_found;
510 if (acpi_lapic && early)
514 * MPS doesn't support hyperthreading, aka only have
515 * thread 0 apic id in MPS table
517 if (acpi_lapic && acpi_ioapic)
520 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
522 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
523 if (mpf->feature2 & (1 << 7)) {
524 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
527 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
532 * Now see if we need to read further.
534 if (mpf->feature1 != 0) {
537 * local APIC has default address
539 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
543 printk(KERN_INFO "Default MP configuration #%d\n",
545 construct_default_ISA_mptable(mpf->feature1);
547 } else if (mpf->physptr) {
548 if (check_physptr(mpf, early))
554 printk(KERN_INFO "Processors: %d\n", num_processors);
556 * Only use the first configuration found.
560 static void __init smp_reserve_memory(struct mpf_intel *mpf)
562 memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
565 static int __init smp_scan_config(unsigned long base, unsigned long length)
567 unsigned int *bp = phys_to_virt(base);
568 struct mpf_intel *mpf;
571 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
573 BUILD_BUG_ON(sizeof(*mpf) != 16);
576 mpf = (struct mpf_intel *)bp;
577 if ((*bp == SMP_MAGIC_IDENT) &&
578 (mpf->length == 1) &&
579 !mpf_checksum((unsigned char *)bp, 16) &&
580 ((mpf->specification == 1)
581 || (mpf->specification == 4))) {
582 #ifdef CONFIG_X86_LOCAL_APIC
583 smp_found_config = 1;
587 printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
588 mpf, (u64)virt_to_phys(mpf));
590 mem = virt_to_phys(mpf);
591 memblock_reserve(mem, sizeof(*mpf));
593 smp_reserve_memory(mpf);
603 void __init default_find_smp_config(void)
605 unsigned int address;
608 * FIXME: Linux assumes you have 640K of base ram..
609 * this continues the error...
611 * 1) Scan the bottom 1K for a signature
612 * 2) Scan the top 1K of base RAM
613 * 3) Scan the 64K of bios
615 if (smp_scan_config(0x0, 0x400) ||
616 smp_scan_config(639 * 0x400, 0x400) ||
617 smp_scan_config(0xF0000, 0x10000))
620 * If it is an SMP machine we should know now, unless the
621 * configuration is in an EISA bus machine with an
622 * extended bios data area.
624 * there is a real-mode segmented pointer pointing to the
625 * 4K EBDA area at 0x40E, calculate and scan it here.
627 * NOTE! There are Linux loaders that will corrupt the EBDA
628 * area, and as such this kind of SMP config may be less
629 * trustworthy, simply because the SMP table may have been
630 * stomped on during early boot. These loaders are buggy and
633 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
636 address = get_bios_ebda();
638 smp_scan_config(address, 0x400);
641 #ifdef CONFIG_X86_IO_APIC
642 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
644 static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
648 if (m->irqtype != mp_INT)
651 if (m->irqflag != 0x0f)
656 for (i = 0; i < mp_irq_entries; i++) {
657 if (mp_irqs[i].irqtype != mp_INT)
660 if (mp_irqs[i].irqflag != 0x0f)
663 if (mp_irqs[i].srcbus != m->srcbus)
665 if (mp_irqs[i].srcbusirq != m->srcbusirq)
668 /* already claimed */
679 #define SPARE_SLOT_NUM 20
681 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
683 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
687 apic_printk(APIC_VERBOSE, "OLD ");
688 print_mp_irq_info(m);
690 i = get_MP_intsrc_index(m);
692 memcpy(m, &mp_irqs[i], sizeof(*m));
693 apic_printk(APIC_VERBOSE, "NEW ");
694 print_mp_irq_info(&mp_irqs[i]);
698 /* legacy, do nothing */
701 if (*nr_m_spare < SPARE_SLOT_NUM) {
703 * not found (-1), or duplicated (-2) are invalid entries,
704 * we need to use the slot later
706 m_spare[*nr_m_spare] = m;
712 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
714 if (!mpc_new_phys || count <= mpc_new_length) {
715 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
721 #else /* CONFIG_X86_IO_APIC */
723 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
724 #endif /* CONFIG_X86_IO_APIC */
726 static int __init replace_intsrc_all(struct mpc_table *mpc,
727 unsigned long mpc_new_phys,
728 unsigned long mpc_new_length)
730 #ifdef CONFIG_X86_IO_APIC
733 int count = sizeof(*mpc);
735 unsigned char *mpt = ((unsigned char *)mpc) + count;
737 printk(KERN_INFO "mpc_length %x\n", mpc->length);
738 while (count < mpc->length) {
741 skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
744 skip_entry(&mpt, &count, sizeof(struct mpc_bus));
747 skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
750 check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
751 skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
754 skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
758 smp_dump_mptable(mpc, mpt);
763 #ifdef CONFIG_X86_IO_APIC
764 for (i = 0; i < mp_irq_entries; i++) {
768 if (mp_irqs[i].irqtype != mp_INT)
771 if (mp_irqs[i].irqflag != 0x0f)
774 if (nr_m_spare > 0) {
775 apic_printk(APIC_VERBOSE, "*NEW* found\n");
777 memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
778 m_spare[nr_m_spare] = NULL;
780 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
781 count += sizeof(struct mpc_intsrc);
782 if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
784 memcpy(m, &mp_irqs[i], sizeof(*m));
786 mpt += sizeof(struct mpc_intsrc);
788 print_mp_irq_info(&mp_irqs[i]);
792 /* update checksum */
794 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
799 int enable_update_mptable;
801 static int __init update_mptable_setup(char *str)
803 enable_update_mptable = 1;
809 early_param("update_mptable", update_mptable_setup);
811 static unsigned long __initdata mpc_new_phys;
812 static unsigned long mpc_new_length __initdata = 4096;
814 /* alloc_mptable or alloc_mptable=4k */
815 static int __initdata alloc_mptable;
816 static int __init parse_alloc_mptable_opt(char *p)
818 enable_update_mptable = 1;
825 mpc_new_length = memparse(p, &p);
828 early_param("alloc_mptable", parse_alloc_mptable_opt);
830 void __init early_reserve_e820_mpc_new(void)
832 if (enable_update_mptable && alloc_mptable)
833 mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
836 static int __init update_mp_table(void)
840 struct mpf_intel *mpf;
841 struct mpc_table *mpc, *mpc_new;
843 if (!enable_update_mptable)
851 * Now see if we need to go further.
853 if (mpf->feature1 != 0)
859 mpc = phys_to_virt(mpf->physptr);
861 if (!smp_check_mpc(mpc, oem, str))
864 printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
865 printk(KERN_INFO "physptr: %x\n", mpf->physptr);
867 if (mpc_new_phys && mpc->length > mpc_new_length) {
869 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
874 unsigned char old, new;
875 /* check if we can change the position */
877 old = mpf_checksum((unsigned char *)mpc, mpc->length);
878 mpc->checksum = 0xff;
879 new = mpf_checksum((unsigned char *)mpc, mpc->length);
881 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
884 printk(KERN_INFO "use in-position replacing\n");
886 mpf->physptr = mpc_new_phys;
887 mpc_new = phys_to_virt(mpc_new_phys);
888 memcpy(mpc_new, mpc, mpc->length);
890 /* check if we can modify that */
891 if (mpc_new_phys - mpf->physptr) {
892 struct mpf_intel *mpf_new;
893 /* steal 16 bytes from [0, 1k) */
894 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
895 mpf_new = phys_to_virt(0x400 - 16);
896 memcpy(mpf_new, mpf, 16);
898 mpf->physptr = mpc_new_phys;
901 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
902 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
906 * only replace the one with mp_INT and
907 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
908 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
909 * may need pci=routeirq for all coverage
911 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
916 late_initcall(update_mp_table);