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>
9 * Erich Boleyn : MP v1.4 and additional changes.
10 * Alan Cox : Added EBDA scanning
11 * Ingo Molnar : various cleanups and rewrites
12 * Maciej W. Rozycki: Bits for default MP configurations
13 * Paul Diefenbaugh: Added full ACPI support
17 #include <linux/init.h>
18 #include <linux/acpi.h>
19 #include <linux/delay.h>
20 #include <linux/config.h>
21 #include <linux/bootmem.h>
22 #include <linux/smp_lock.h>
23 #include <linux/kernel_stat.h>
24 #include <linux/mc146818rtc.h>
25 #include <linux/bitops.h>
30 #include <asm/mpspec.h>
31 #include <asm/io_apic.h>
33 #include <mach_apic.h>
34 #include <mach_mpparse.h>
35 #include <bios_ebda.h>
37 /* Have we found an MP table */
39 unsigned int __initdata maxcpus = NR_CPUS;
42 * Various Linux-internal data structures created from the
45 int apic_version [MAX_APICS];
46 int mp_bus_id_to_type [MAX_MP_BUSSES];
47 int mp_bus_id_to_node [MAX_MP_BUSSES];
48 int mp_bus_id_to_local [MAX_MP_BUSSES];
49 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
50 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
51 static int mp_current_pci_id;
53 /* I/O APIC entries */
54 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
56 /* # of MP IRQ source entries */
57 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
59 /* MP IRQ source entries */
65 unsigned long mp_lapic_addr;
67 unsigned int def_to_bigsmp = 0;
69 /* Processor that is doing the boot up */
70 unsigned int boot_cpu_physical_apicid = -1U;
71 /* Internal processor count */
72 static unsigned int __devinitdata num_processors;
74 /* Bitmask of physically existing CPUs */
75 physid_mask_t phys_cpu_present_map;
77 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
80 * Intel MP BIOS table parsing routines:
85 * Checksum an MP configuration block.
88 static int __init mpf_checksum(unsigned char *mp, int len)
99 * Have to match translation table entries to main table entries by counter
100 * hence the mpc_record variable .... can't see a less disgusting way of
104 static int mpc_record;
105 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
107 #ifdef CONFIG_X86_NUMAQ
108 static int MP_valid_apicid(int apicid, int version)
110 return hweight_long(apicid & 0xf) == 1 && (apicid >> 4) != 0xf;
113 static int MP_valid_apicid(int apicid, int version)
116 return apicid < 0xff;
122 static void __devinit MP_processor_info (struct mpc_config_processor *m)
125 physid_mask_t phys_cpu;
127 if (!(m->mpc_cpuflag & CPU_ENABLED))
130 apicid = mpc_apic_id(m, translation_table[mpc_record]);
132 if (m->mpc_featureflag&(1<<0))
133 Dprintk(" Floating point unit present.\n");
134 if (m->mpc_featureflag&(1<<7))
135 Dprintk(" Machine Exception supported.\n");
136 if (m->mpc_featureflag&(1<<8))
137 Dprintk(" 64 bit compare & exchange supported.\n");
138 if (m->mpc_featureflag&(1<<9))
139 Dprintk(" Internal APIC present.\n");
140 if (m->mpc_featureflag&(1<<11))
141 Dprintk(" SEP present.\n");
142 if (m->mpc_featureflag&(1<<12))
143 Dprintk(" MTRR present.\n");
144 if (m->mpc_featureflag&(1<<13))
145 Dprintk(" PGE present.\n");
146 if (m->mpc_featureflag&(1<<14))
147 Dprintk(" MCA present.\n");
148 if (m->mpc_featureflag&(1<<15))
149 Dprintk(" CMOV present.\n");
150 if (m->mpc_featureflag&(1<<16))
151 Dprintk(" PAT present.\n");
152 if (m->mpc_featureflag&(1<<17))
153 Dprintk(" PSE present.\n");
154 if (m->mpc_featureflag&(1<<18))
155 Dprintk(" PSN present.\n");
156 if (m->mpc_featureflag&(1<<19))
157 Dprintk(" Cache Line Flush Instruction present.\n");
159 if (m->mpc_featureflag&(1<<21))
160 Dprintk(" Debug Trace and EMON Store present.\n");
161 if (m->mpc_featureflag&(1<<22))
162 Dprintk(" ACPI Thermal Throttle Registers present.\n");
163 if (m->mpc_featureflag&(1<<23))
164 Dprintk(" MMX present.\n");
165 if (m->mpc_featureflag&(1<<24))
166 Dprintk(" FXSR present.\n");
167 if (m->mpc_featureflag&(1<<25))
168 Dprintk(" XMM present.\n");
169 if (m->mpc_featureflag&(1<<26))
170 Dprintk(" Willamette New Instructions present.\n");
171 if (m->mpc_featureflag&(1<<27))
172 Dprintk(" Self Snoop present.\n");
173 if (m->mpc_featureflag&(1<<28))
174 Dprintk(" HT present.\n");
175 if (m->mpc_featureflag&(1<<29))
176 Dprintk(" Thermal Monitor present.\n");
177 /* 30, 31 Reserved */
180 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
181 Dprintk(" Bootup CPU\n");
182 boot_cpu_physical_apicid = m->mpc_apicid;
185 ver = m->mpc_apicver;
187 if (!MP_valid_apicid(apicid, ver)) {
188 printk(KERN_WARNING "Processor #%d INVALID. (Max ID: %d).\n",
189 m->mpc_apicid, MAX_APICS);
197 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
198 "fixing up to 0x10. (tell your hw vendor)\n",
202 apic_version[m->mpc_apicid] = ver;
204 phys_cpu = apicid_to_cpu_present(apicid);
205 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
207 if (num_processors >= NR_CPUS) {
208 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
209 " Processor ignored.\n", NR_CPUS);
213 if (num_processors >= maxcpus) {
214 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
215 " Processor ignored.\n", maxcpus);
219 cpu_set(num_processors, cpu_possible_map);
222 if ((num_processors > 8) &&
224 (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)) ||
225 (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)))
230 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
233 static void __init MP_bus_info (struct mpc_config_bus *m)
237 memcpy(str, m->mpc_bustype, 6);
240 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
242 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
243 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
244 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
245 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
246 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
247 mpc_oem_pci_bus(m, translation_table[mpc_record]);
248 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
249 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
251 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
252 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
253 } else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
254 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
256 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
260 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
262 if (!(m->mpc_flags & MPC_APIC_USABLE))
265 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
266 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
267 if (nr_ioapics >= MAX_IO_APICS) {
268 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
269 MAX_IO_APICS, nr_ioapics);
270 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
272 if (!m->mpc_apicaddr) {
273 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
274 " found in MP table, skipping!\n");
277 mp_ioapics[nr_ioapics] = *m;
281 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
283 mp_irqs [mp_irq_entries] = *m;
284 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
285 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
286 m->mpc_irqtype, m->mpc_irqflag & 3,
287 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
288 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
289 if (++mp_irq_entries == MAX_IRQ_SOURCES)
290 panic("Max # of irq sources exceeded!!\n");
293 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
295 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
296 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
297 m->mpc_irqtype, m->mpc_irqflag & 3,
298 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
299 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
301 * Well it seems all SMP boards in existence
302 * use ExtINT/LVT1 == LINT0 and
303 * NMI/LVT2 == LINT1 - the following check
304 * will show us if this assumptions is false.
305 * Until then we do not have to add baggage.
307 if ((m->mpc_irqtype == mp_ExtINT) &&
308 (m->mpc_destapiclint != 0))
310 if ((m->mpc_irqtype == mp_NMI) &&
311 (m->mpc_destapiclint != 1))
315 #ifdef CONFIG_X86_NUMAQ
316 static void __init MP_translation_info (struct mpc_config_translation *m)
318 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);
320 if (mpc_record >= MAX_MPC_ENTRY)
321 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
323 translation_table[mpc_record] = m; /* stash this for later */
324 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
325 node_set_online(m->trans_quad);
329 * Read/parse the MPC oem tables
332 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
333 unsigned short oemsize)
335 int count = sizeof (*oemtable); /* the header size */
336 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
339 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
340 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
342 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
343 oemtable->oem_signature[0],
344 oemtable->oem_signature[1],
345 oemtable->oem_signature[2],
346 oemtable->oem_signature[3]);
349 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
351 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
354 while (count < oemtable->oem_length) {
358 struct mpc_config_translation *m=
359 (struct mpc_config_translation *)oemptr;
360 MP_translation_info(m);
361 oemptr += sizeof(*m);
368 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
375 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
378 if (strncmp(oem, "IBM NUMA", 8))
379 printk("Warning! May not be a NUMA-Q system!\n");
381 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
384 #endif /* CONFIG_X86_NUMAQ */
390 static int __init smp_read_mpc(struct mp_config_table *mpc)
394 int count=sizeof(*mpc);
395 unsigned char *mpt=((unsigned char *)mpc)+count;
397 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
398 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
399 *(u32 *)mpc->mpc_signature);
402 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
403 printk(KERN_ERR "SMP mptable: checksum error!\n");
406 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
407 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
411 if (!mpc->mpc_lapic) {
412 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
415 memcpy(oem,mpc->mpc_oem,8);
417 printk(KERN_INFO "OEM ID: %s ",oem);
419 memcpy(str,mpc->mpc_productid,12);
421 printk("Product ID: %s ",str);
423 mps_oem_check(mpc, oem, str);
425 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
428 * Save the local APIC address (it might be non-default) -- but only
429 * if we're not using ACPI.
432 mp_lapic_addr = mpc->mpc_lapic;
435 * Now process the configuration blocks.
438 while (count < mpc->mpc_length) {
442 struct mpc_config_processor *m=
443 (struct mpc_config_processor *)mpt;
444 /* ACPI may have already provided this data */
446 MP_processor_info(m);
453 struct mpc_config_bus *m=
454 (struct mpc_config_bus *)mpt;
462 struct mpc_config_ioapic *m=
463 (struct mpc_config_ioapic *)mpt;
471 struct mpc_config_intsrc *m=
472 (struct mpc_config_intsrc *)mpt;
481 struct mpc_config_lintsrc *m=
482 (struct mpc_config_lintsrc *)mpt;
490 count = mpc->mpc_length;
496 clustered_apic_check();
498 printk(KERN_ERR "SMP mptable: no processors registered!\n");
499 return num_processors;
502 static int __init ELCR_trigger(unsigned int irq)
506 port = 0x4d0 + (irq >> 3);
507 return (inb(port) >> (irq & 7)) & 1;
510 static void __init construct_default_ioirq_mptable(int mpc_default_type)
512 struct mpc_config_intsrc intsrc;
514 int ELCR_fallback = 0;
516 intsrc.mpc_type = MP_INTSRC;
517 intsrc.mpc_irqflag = 0; /* conforming */
518 intsrc.mpc_srcbus = 0;
519 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
521 intsrc.mpc_irqtype = mp_INT;
524 * If true, we have an ISA/PCI system with no IRQ entries
525 * in the MP table. To prevent the PCI interrupts from being set up
526 * incorrectly, we try to use the ELCR. The sanity check to see if
527 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
528 * never be level sensitive, so we simply see if the ELCR agrees.
529 * If it does, we assume it's valid.
531 if (mpc_default_type == 5) {
532 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
534 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
535 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
537 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
542 for (i = 0; i < 16; i++) {
543 switch (mpc_default_type) {
545 if (i == 0 || i == 13)
546 continue; /* IRQ0 & IRQ13 not connected */
550 continue; /* IRQ2 is never connected */
555 * If the ELCR indicates a level-sensitive interrupt, we
556 * copy that information over to the MP table in the
557 * irqflag field (level sensitive, active high polarity).
560 intsrc.mpc_irqflag = 13;
562 intsrc.mpc_irqflag = 0;
565 intsrc.mpc_srcbusirq = i;
566 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
567 MP_intsrc_info(&intsrc);
570 intsrc.mpc_irqtype = mp_ExtINT;
571 intsrc.mpc_srcbusirq = 0;
572 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
573 MP_intsrc_info(&intsrc);
576 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
578 struct mpc_config_processor processor;
579 struct mpc_config_bus bus;
580 struct mpc_config_ioapic ioapic;
581 struct mpc_config_lintsrc lintsrc;
582 int linttypes[2] = { mp_ExtINT, mp_NMI };
586 * local APIC has default address
588 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
591 * 2 CPUs, numbered 0 & 1.
593 processor.mpc_type = MP_PROCESSOR;
594 /* Either an integrated APIC or a discrete 82489DX. */
595 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
596 processor.mpc_cpuflag = CPU_ENABLED;
597 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
598 (boot_cpu_data.x86_model << 4) |
599 boot_cpu_data.x86_mask;
600 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
601 processor.mpc_reserved[0] = 0;
602 processor.mpc_reserved[1] = 0;
603 for (i = 0; i < 2; i++) {
604 processor.mpc_apicid = i;
605 MP_processor_info(&processor);
608 bus.mpc_type = MP_BUS;
610 switch (mpc_default_type) {
613 printk(KERN_ERR "Unknown standard configuration %d\n",
618 memcpy(bus.mpc_bustype, "ISA ", 6);
623 memcpy(bus.mpc_bustype, "EISA ", 6);
627 memcpy(bus.mpc_bustype, "MCA ", 6);
630 if (mpc_default_type > 4) {
632 memcpy(bus.mpc_bustype, "PCI ", 6);
636 ioapic.mpc_type = MP_IOAPIC;
637 ioapic.mpc_apicid = 2;
638 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
639 ioapic.mpc_flags = MPC_APIC_USABLE;
640 ioapic.mpc_apicaddr = 0xFEC00000;
641 MP_ioapic_info(&ioapic);
644 * We set up most of the low 16 IO-APIC pins according to MPS rules.
646 construct_default_ioirq_mptable(mpc_default_type);
648 lintsrc.mpc_type = MP_LINTSRC;
649 lintsrc.mpc_irqflag = 0; /* conforming */
650 lintsrc.mpc_srcbusid = 0;
651 lintsrc.mpc_srcbusirq = 0;
652 lintsrc.mpc_destapic = MP_APIC_ALL;
653 for (i = 0; i < 2; i++) {
654 lintsrc.mpc_irqtype = linttypes[i];
655 lintsrc.mpc_destapiclint = i;
656 MP_lintsrc_info(&lintsrc);
660 static struct intel_mp_floating *mpf_found;
663 * Scan the memory blocks for an SMP configuration block.
665 void __init get_smp_config (void)
667 struct intel_mp_floating *mpf = mpf_found;
670 * ACPI supports both logical (e.g. Hyper-Threading) and physical
671 * processors, where MPS only supports physical.
673 if (acpi_lapic && acpi_ioapic) {
674 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
678 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
680 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
681 if (mpf->mpf_feature2 & (1<<7)) {
682 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
685 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
690 * Now see if we need to read further.
692 if (mpf->mpf_feature1 != 0) {
694 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
695 construct_default_ISA_mptable(mpf->mpf_feature1);
697 } else if (mpf->mpf_physptr) {
700 * Read the physical hardware table. Anything here will
701 * override the defaults.
703 if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
704 smp_found_config = 0;
705 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
706 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
710 * If there are no explicit MP IRQ entries, then we are
711 * broken. We set up most of the low 16 IO-APIC pins to
712 * ISA defaults and hope it will work.
714 if (!mp_irq_entries) {
715 struct mpc_config_bus bus;
717 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
719 bus.mpc_type = MP_BUS;
721 memcpy(bus.mpc_bustype, "ISA ", 6);
724 construct_default_ioirq_mptable(0);
730 printk(KERN_INFO "Processors: %d\n", num_processors);
732 * Only use the first configuration found.
736 static int __init smp_scan_config (unsigned long base, unsigned long length)
738 unsigned long *bp = phys_to_virt(base);
739 struct intel_mp_floating *mpf;
741 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
742 if (sizeof(*mpf) != 16)
743 printk("Error: MPF size\n");
746 mpf = (struct intel_mp_floating *)bp;
747 if ((*bp == SMP_MAGIC_IDENT) &&
748 (mpf->mpf_length == 1) &&
749 !mpf_checksum((unsigned char *)bp, 16) &&
750 ((mpf->mpf_specification == 1)
751 || (mpf->mpf_specification == 4)) ) {
753 smp_found_config = 1;
754 printk(KERN_INFO "found SMP MP-table at %08lx\n",
756 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
757 if (mpf->mpf_physptr) {
759 * We cannot access to MPC table to compute
760 * table size yet, as only few megabytes from
761 * the bottom is mapped now.
762 * PC-9800's MPC table places on the very last
763 * of physical memory; so that simply reserving
764 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
765 * in reserve_bootmem.
767 unsigned long size = PAGE_SIZE;
768 unsigned long end = max_low_pfn * PAGE_SIZE;
769 if (mpf->mpf_physptr + size > end)
770 size = end - mpf->mpf_physptr;
771 reserve_bootmem(mpf->mpf_physptr, size);
783 void __init find_smp_config (void)
785 unsigned int address;
788 * FIXME: Linux assumes you have 640K of base ram..
789 * this continues the error...
791 * 1) Scan the bottom 1K for a signature
792 * 2) Scan the top 1K of base RAM
793 * 3) Scan the 64K of bios
795 if (smp_scan_config(0x0,0x400) ||
796 smp_scan_config(639*0x400,0x400) ||
797 smp_scan_config(0xF0000,0x10000))
800 * If it is an SMP machine we should know now, unless the
801 * configuration is in an EISA/MCA bus machine with an
802 * extended bios data area.
804 * there is a real-mode segmented pointer pointing to the
805 * 4K EBDA area at 0x40E, calculate and scan it here.
807 * NOTE! There are Linux loaders that will corrupt the EBDA
808 * area, and as such this kind of SMP config may be less
809 * trustworthy, simply because the SMP table may have been
810 * stomped on during early boot. These loaders are buggy and
813 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
816 address = get_bios_ebda();
818 smp_scan_config(address, 0x400);
821 /* --------------------------------------------------------------------------
822 ACPI-based MP Configuration
823 -------------------------------------------------------------------------- */
827 void __init mp_register_lapic_address (
830 mp_lapic_addr = (unsigned long) address;
832 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
834 if (boot_cpu_physical_apicid == -1U)
835 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
837 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
841 void __devinit mp_register_lapic (
845 struct mpc_config_processor processor;
848 if (MAX_APICS - id <= 0) {
849 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
854 if (id == boot_cpu_physical_apicid)
857 processor.mpc_type = MP_PROCESSOR;
858 processor.mpc_apicid = id;
859 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
860 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
861 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
862 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
863 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
864 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
865 processor.mpc_reserved[0] = 0;
866 processor.mpc_reserved[1] = 0;
868 MP_processor_info(&processor);
871 #ifdef CONFIG_X86_IO_APIC
874 #define MP_MAX_IOAPIC_PIN 127
876 static struct mp_ioapic_routing {
880 u32 pin_programmed[4];
881 } mp_ioapic_routing[MAX_IO_APICS];
884 static int mp_find_ioapic (
889 /* Find the IOAPIC that manages this GSI. */
890 for (i = 0; i < nr_ioapics; i++) {
891 if ((gsi >= mp_ioapic_routing[i].gsi_base)
892 && (gsi <= mp_ioapic_routing[i].gsi_end))
896 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
902 void __init mp_register_ioapic (
909 if (nr_ioapics >= MAX_IO_APICS) {
910 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
911 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
912 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
915 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
916 " found in MADT table, skipping!\n");
922 mp_ioapics[idx].mpc_type = MP_IOAPIC;
923 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
924 mp_ioapics[idx].mpc_apicaddr = address;
926 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
927 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))
928 mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
930 mp_ioapics[idx].mpc_apicid = id;
931 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
934 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
935 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
937 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
938 mp_ioapic_routing[idx].gsi_base = gsi_base;
939 mp_ioapic_routing[idx].gsi_end = gsi_base +
940 io_apic_get_redir_entries(idx);
942 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
943 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
944 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
945 mp_ioapic_routing[idx].gsi_base,
946 mp_ioapic_routing[idx].gsi_end);
952 void __init mp_override_legacy_irq (
958 struct mpc_config_intsrc intsrc;
963 * Convert 'gsi' to 'ioapic.pin'.
965 ioapic = mp_find_ioapic(gsi);
968 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
971 * TBD: This check is for faulty timer entries, where the override
972 * erroneously sets the trigger to level, resulting in a HUGE
973 * increase of timer interrupts!
975 if ((bus_irq == 0) && (trigger == 3))
978 intsrc.mpc_type = MP_INTSRC;
979 intsrc.mpc_irqtype = mp_INT;
980 intsrc.mpc_irqflag = (trigger << 2) | polarity;
981 intsrc.mpc_srcbus = MP_ISA_BUS;
982 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
983 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
984 intsrc.mpc_dstirq = pin; /* INTIN# */
986 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
987 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
988 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
989 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
991 mp_irqs[mp_irq_entries] = intsrc;
992 if (++mp_irq_entries == MAX_IRQ_SOURCES)
993 panic("Max # of irq sources exceeded!\n");
1000 void __init mp_config_acpi_legacy_irqs (void)
1002 struct mpc_config_intsrc intsrc;
1007 * Fabricate the legacy ISA bus (bus #31).
1009 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1010 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1013 * Older generations of ES7000 have no legacy identity mappings
1015 if (es7000_plat == 1)
1019 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1021 ioapic = mp_find_ioapic(0);
1025 intsrc.mpc_type = MP_INTSRC;
1026 intsrc.mpc_irqflag = 0; /* Conforming */
1027 intsrc.mpc_srcbus = MP_ISA_BUS;
1028 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1031 * Use the default configuration for the IRQs 0-15. Unless
1032 * overriden by (MADT) interrupt source override entries.
1034 for (i = 0; i < 16; i++) {
1037 for (idx = 0; idx < mp_irq_entries; idx++) {
1038 struct mpc_config_intsrc *irq = mp_irqs + idx;
1040 /* Do we already have a mapping for this ISA IRQ? */
1041 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1044 /* Do we already have a mapping for this IOAPIC pin */
1045 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1046 (irq->mpc_dstirq == i))
1050 if (idx != mp_irq_entries) {
1051 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1052 continue; /* IRQ already used */
1055 intsrc.mpc_irqtype = mp_INT;
1056 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1057 intsrc.mpc_dstirq = i;
1059 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1060 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1061 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1062 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1065 mp_irqs[mp_irq_entries] = intsrc;
1066 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1067 panic("Max # of irq sources exceeded!\n");
1071 #define MAX_GSI_NUM 4096
1073 int mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
1078 static int pci_irq = 16;
1080 * Mapping between Global System Interrups, which
1081 * represent all possible interrupts, and IRQs
1082 * assigned to actual devices.
1084 static int gsi_to_irq[MAX_GSI_NUM];
1086 /* Don't set up the ACPI SCI because it's already set up */
1087 if (acpi_fadt.sci_int == gsi)
1090 ioapic = mp_find_ioapic(gsi);
1092 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1096 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1098 if (ioapic_renumber_irq)
1099 gsi = ioapic_renumber_irq(ioapic, gsi);
1102 * Avoid pin reprogramming. PRTs typically include entries
1103 * with redundant pin->gsi mappings (but unique PCI devices);
1104 * we only program the IOAPIC on the first.
1106 bit = ioapic_pin % 32;
1107 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1109 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1110 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1114 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1115 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1116 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1117 return gsi_to_irq[gsi];
1120 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1124 * For PCI devices assign IRQs in order, avoiding gaps
1125 * due to unused I/O APIC pins.
1128 if (gsi < MAX_GSI_NUM) {
1132 * Don't assign IRQ used by ACPI SCI
1134 if (gsi == acpi_fadt.sci_int)
1136 gsi_to_irq[irq] = gsi;
1138 printk(KERN_ERR "GSI %u is too high\n", gsi);
1143 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1144 edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
1145 active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
1149 #endif /* CONFIG_X86_IO_APIC */
1150 #endif /* CONFIG_ACPI */