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))
229 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
232 static void __init MP_bus_info (struct mpc_config_bus *m)
236 memcpy(str, m->mpc_bustype, 6);
239 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
241 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
242 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
243 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
244 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
245 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
246 mpc_oem_pci_bus(m, translation_table[mpc_record]);
247 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
248 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
250 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
251 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
252 } else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
253 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
255 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
259 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
261 if (!(m->mpc_flags & MPC_APIC_USABLE))
264 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
265 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
266 if (nr_ioapics >= MAX_IO_APICS) {
267 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
268 MAX_IO_APICS, nr_ioapics);
269 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
271 if (!m->mpc_apicaddr) {
272 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
273 " found in MP table, skipping!\n");
276 mp_ioapics[nr_ioapics] = *m;
280 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
282 mp_irqs [mp_irq_entries] = *m;
283 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
284 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
285 m->mpc_irqtype, m->mpc_irqflag & 3,
286 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
287 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
288 if (++mp_irq_entries == MAX_IRQ_SOURCES)
289 panic("Max # of irq sources exceeded!!\n");
292 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
294 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
295 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
296 m->mpc_irqtype, m->mpc_irqflag & 3,
297 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
298 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
300 * Well it seems all SMP boards in existence
301 * use ExtINT/LVT1 == LINT0 and
302 * NMI/LVT2 == LINT1 - the following check
303 * will show us if this assumptions is false.
304 * Until then we do not have to add baggage.
306 if ((m->mpc_irqtype == mp_ExtINT) &&
307 (m->mpc_destapiclint != 0))
309 if ((m->mpc_irqtype == mp_NMI) &&
310 (m->mpc_destapiclint != 1))
314 #ifdef CONFIG_X86_NUMAQ
315 static void __init MP_translation_info (struct mpc_config_translation *m)
317 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);
319 if (mpc_record >= MAX_MPC_ENTRY)
320 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
322 translation_table[mpc_record] = m; /* stash this for later */
323 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
324 node_set_online(m->trans_quad);
328 * Read/parse the MPC oem tables
331 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
332 unsigned short oemsize)
334 int count = sizeof (*oemtable); /* the header size */
335 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
338 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
339 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
341 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
342 oemtable->oem_signature[0],
343 oemtable->oem_signature[1],
344 oemtable->oem_signature[2],
345 oemtable->oem_signature[3]);
348 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
350 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
353 while (count < oemtable->oem_length) {
357 struct mpc_config_translation *m=
358 (struct mpc_config_translation *)oemptr;
359 MP_translation_info(m);
360 oemptr += sizeof(*m);
367 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
374 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
377 if (strncmp(oem, "IBM NUMA", 8))
378 printk("Warning! May not be a NUMA-Q system!\n");
380 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
383 #endif /* CONFIG_X86_NUMAQ */
389 static int __init smp_read_mpc(struct mp_config_table *mpc)
393 int count=sizeof(*mpc);
394 unsigned char *mpt=((unsigned char *)mpc)+count;
396 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
397 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
398 *(u32 *)mpc->mpc_signature);
401 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
402 printk(KERN_ERR "SMP mptable: checksum error!\n");
405 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
406 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
410 if (!mpc->mpc_lapic) {
411 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
414 memcpy(oem,mpc->mpc_oem,8);
416 printk(KERN_INFO "OEM ID: %s ",oem);
418 memcpy(str,mpc->mpc_productid,12);
420 printk("Product ID: %s ",str);
422 mps_oem_check(mpc, oem, str);
424 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
427 * Save the local APIC address (it might be non-default) -- but only
428 * if we're not using ACPI.
431 mp_lapic_addr = mpc->mpc_lapic;
434 * Now process the configuration blocks.
437 while (count < mpc->mpc_length) {
441 struct mpc_config_processor *m=
442 (struct mpc_config_processor *)mpt;
443 /* ACPI may have already provided this data */
445 MP_processor_info(m);
452 struct mpc_config_bus *m=
453 (struct mpc_config_bus *)mpt;
461 struct mpc_config_ioapic *m=
462 (struct mpc_config_ioapic *)mpt;
470 struct mpc_config_intsrc *m=
471 (struct mpc_config_intsrc *)mpt;
480 struct mpc_config_lintsrc *m=
481 (struct mpc_config_lintsrc *)mpt;
489 count = mpc->mpc_length;
495 clustered_apic_check();
497 printk(KERN_ERR "SMP mptable: no processors registered!\n");
498 return num_processors;
501 static int __init ELCR_trigger(unsigned int irq)
505 port = 0x4d0 + (irq >> 3);
506 return (inb(port) >> (irq & 7)) & 1;
509 static void __init construct_default_ioirq_mptable(int mpc_default_type)
511 struct mpc_config_intsrc intsrc;
513 int ELCR_fallback = 0;
515 intsrc.mpc_type = MP_INTSRC;
516 intsrc.mpc_irqflag = 0; /* conforming */
517 intsrc.mpc_srcbus = 0;
518 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
520 intsrc.mpc_irqtype = mp_INT;
523 * If true, we have an ISA/PCI system with no IRQ entries
524 * in the MP table. To prevent the PCI interrupts from being set up
525 * incorrectly, we try to use the ELCR. The sanity check to see if
526 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
527 * never be level sensitive, so we simply see if the ELCR agrees.
528 * If it does, we assume it's valid.
530 if (mpc_default_type == 5) {
531 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
533 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
534 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
536 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
541 for (i = 0; i < 16; i++) {
542 switch (mpc_default_type) {
544 if (i == 0 || i == 13)
545 continue; /* IRQ0 & IRQ13 not connected */
549 continue; /* IRQ2 is never connected */
554 * If the ELCR indicates a level-sensitive interrupt, we
555 * copy that information over to the MP table in the
556 * irqflag field (level sensitive, active high polarity).
559 intsrc.mpc_irqflag = 13;
561 intsrc.mpc_irqflag = 0;
564 intsrc.mpc_srcbusirq = i;
565 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
566 MP_intsrc_info(&intsrc);
569 intsrc.mpc_irqtype = mp_ExtINT;
570 intsrc.mpc_srcbusirq = 0;
571 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
572 MP_intsrc_info(&intsrc);
575 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
577 struct mpc_config_processor processor;
578 struct mpc_config_bus bus;
579 struct mpc_config_ioapic ioapic;
580 struct mpc_config_lintsrc lintsrc;
581 int linttypes[2] = { mp_ExtINT, mp_NMI };
585 * local APIC has default address
587 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
590 * 2 CPUs, numbered 0 & 1.
592 processor.mpc_type = MP_PROCESSOR;
593 /* Either an integrated APIC or a discrete 82489DX. */
594 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
595 processor.mpc_cpuflag = CPU_ENABLED;
596 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
597 (boot_cpu_data.x86_model << 4) |
598 boot_cpu_data.x86_mask;
599 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
600 processor.mpc_reserved[0] = 0;
601 processor.mpc_reserved[1] = 0;
602 for (i = 0; i < 2; i++) {
603 processor.mpc_apicid = i;
604 MP_processor_info(&processor);
607 bus.mpc_type = MP_BUS;
609 switch (mpc_default_type) {
612 printk(KERN_ERR "Unknown standard configuration %d\n",
617 memcpy(bus.mpc_bustype, "ISA ", 6);
622 memcpy(bus.mpc_bustype, "EISA ", 6);
626 memcpy(bus.mpc_bustype, "MCA ", 6);
629 if (mpc_default_type > 4) {
631 memcpy(bus.mpc_bustype, "PCI ", 6);
635 ioapic.mpc_type = MP_IOAPIC;
636 ioapic.mpc_apicid = 2;
637 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
638 ioapic.mpc_flags = MPC_APIC_USABLE;
639 ioapic.mpc_apicaddr = 0xFEC00000;
640 MP_ioapic_info(&ioapic);
643 * We set up most of the low 16 IO-APIC pins according to MPS rules.
645 construct_default_ioirq_mptable(mpc_default_type);
647 lintsrc.mpc_type = MP_LINTSRC;
648 lintsrc.mpc_irqflag = 0; /* conforming */
649 lintsrc.mpc_srcbusid = 0;
650 lintsrc.mpc_srcbusirq = 0;
651 lintsrc.mpc_destapic = MP_APIC_ALL;
652 for (i = 0; i < 2; i++) {
653 lintsrc.mpc_irqtype = linttypes[i];
654 lintsrc.mpc_destapiclint = i;
655 MP_lintsrc_info(&lintsrc);
659 static struct intel_mp_floating *mpf_found;
662 * Scan the memory blocks for an SMP configuration block.
664 void __init get_smp_config (void)
666 struct intel_mp_floating *mpf = mpf_found;
669 * ACPI supports both logical (e.g. Hyper-Threading) and physical
670 * processors, where MPS only supports physical.
672 if (acpi_lapic && acpi_ioapic) {
673 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
677 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
679 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
680 if (mpf->mpf_feature2 & (1<<7)) {
681 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
684 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
689 * Now see if we need to read further.
691 if (mpf->mpf_feature1 != 0) {
693 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
694 construct_default_ISA_mptable(mpf->mpf_feature1);
696 } else if (mpf->mpf_physptr) {
699 * Read the physical hardware table. Anything here will
700 * override the defaults.
702 if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
703 smp_found_config = 0;
704 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
705 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
709 * If there are no explicit MP IRQ entries, then we are
710 * broken. We set up most of the low 16 IO-APIC pins to
711 * ISA defaults and hope it will work.
713 if (!mp_irq_entries) {
714 struct mpc_config_bus bus;
716 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
718 bus.mpc_type = MP_BUS;
720 memcpy(bus.mpc_bustype, "ISA ", 6);
723 construct_default_ioirq_mptable(0);
729 printk(KERN_INFO "Processors: %d\n", num_processors);
731 * Only use the first configuration found.
735 static int __init smp_scan_config (unsigned long base, unsigned long length)
737 unsigned long *bp = phys_to_virt(base);
738 struct intel_mp_floating *mpf;
740 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
741 if (sizeof(*mpf) != 16)
742 printk("Error: MPF size\n");
745 mpf = (struct intel_mp_floating *)bp;
746 if ((*bp == SMP_MAGIC_IDENT) &&
747 (mpf->mpf_length == 1) &&
748 !mpf_checksum((unsigned char *)bp, 16) &&
749 ((mpf->mpf_specification == 1)
750 || (mpf->mpf_specification == 4)) ) {
752 smp_found_config = 1;
753 printk(KERN_INFO "found SMP MP-table at %08lx\n",
755 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
756 if (mpf->mpf_physptr) {
758 * We cannot access to MPC table to compute
759 * table size yet, as only few megabytes from
760 * the bottom is mapped now.
761 * PC-9800's MPC table places on the very last
762 * of physical memory; so that simply reserving
763 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
764 * in reserve_bootmem.
766 unsigned long size = PAGE_SIZE;
767 unsigned long end = max_low_pfn * PAGE_SIZE;
768 if (mpf->mpf_physptr + size > end)
769 size = end - mpf->mpf_physptr;
770 reserve_bootmem(mpf->mpf_physptr, size);
782 void __init find_smp_config (void)
784 unsigned int address;
787 * FIXME: Linux assumes you have 640K of base ram..
788 * this continues the error...
790 * 1) Scan the bottom 1K for a signature
791 * 2) Scan the top 1K of base RAM
792 * 3) Scan the 64K of bios
794 if (smp_scan_config(0x0,0x400) ||
795 smp_scan_config(639*0x400,0x400) ||
796 smp_scan_config(0xF0000,0x10000))
799 * If it is an SMP machine we should know now, unless the
800 * configuration is in an EISA/MCA bus machine with an
801 * extended bios data area.
803 * there is a real-mode segmented pointer pointing to the
804 * 4K EBDA area at 0x40E, calculate and scan it here.
806 * NOTE! There are Linux loaders that will corrupt the EBDA
807 * area, and as such this kind of SMP config may be less
808 * trustworthy, simply because the SMP table may have been
809 * stomped on during early boot. These loaders are buggy and
812 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
815 address = get_bios_ebda();
817 smp_scan_config(address, 0x400);
820 /* --------------------------------------------------------------------------
821 ACPI-based MP Configuration
822 -------------------------------------------------------------------------- */
826 void __init mp_register_lapic_address (
829 mp_lapic_addr = (unsigned long) address;
831 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
833 if (boot_cpu_physical_apicid == -1U)
834 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
836 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
840 void __devinit mp_register_lapic (
844 struct mpc_config_processor processor;
847 if (MAX_APICS - id <= 0) {
848 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
853 if (id == boot_cpu_physical_apicid)
856 processor.mpc_type = MP_PROCESSOR;
857 processor.mpc_apicid = id;
858 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
859 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
860 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
861 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
862 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
863 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
864 processor.mpc_reserved[0] = 0;
865 processor.mpc_reserved[1] = 0;
867 MP_processor_info(&processor);
870 #ifdef CONFIG_X86_IO_APIC
873 #define MP_MAX_IOAPIC_PIN 127
875 static struct mp_ioapic_routing {
879 u32 pin_programmed[4];
880 } mp_ioapic_routing[MAX_IO_APICS];
883 static int mp_find_ioapic (
888 /* Find the IOAPIC that manages this GSI. */
889 for (i = 0; i < nr_ioapics; i++) {
890 if ((gsi >= mp_ioapic_routing[i].gsi_base)
891 && (gsi <= mp_ioapic_routing[i].gsi_end))
895 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
901 void __init mp_register_ioapic (
908 if (nr_ioapics >= MAX_IO_APICS) {
909 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
910 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
911 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
914 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
915 " found in MADT table, skipping!\n");
921 mp_ioapics[idx].mpc_type = MP_IOAPIC;
922 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
923 mp_ioapics[idx].mpc_apicaddr = address;
925 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
926 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))
927 mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
929 mp_ioapics[idx].mpc_apicid = id;
930 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
933 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
934 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
936 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
937 mp_ioapic_routing[idx].gsi_base = gsi_base;
938 mp_ioapic_routing[idx].gsi_end = gsi_base +
939 io_apic_get_redir_entries(idx);
941 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
942 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
943 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
944 mp_ioapic_routing[idx].gsi_base,
945 mp_ioapic_routing[idx].gsi_end);
951 void __init mp_override_legacy_irq (
957 struct mpc_config_intsrc intsrc;
962 * Convert 'gsi' to 'ioapic.pin'.
964 ioapic = mp_find_ioapic(gsi);
967 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
970 * TBD: This check is for faulty timer entries, where the override
971 * erroneously sets the trigger to level, resulting in a HUGE
972 * increase of timer interrupts!
974 if ((bus_irq == 0) && (trigger == 3))
977 intsrc.mpc_type = MP_INTSRC;
978 intsrc.mpc_irqtype = mp_INT;
979 intsrc.mpc_irqflag = (trigger << 2) | polarity;
980 intsrc.mpc_srcbus = MP_ISA_BUS;
981 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
982 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
983 intsrc.mpc_dstirq = pin; /* INTIN# */
985 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
986 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
987 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
988 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
990 mp_irqs[mp_irq_entries] = intsrc;
991 if (++mp_irq_entries == MAX_IRQ_SOURCES)
992 panic("Max # of irq sources exceeded!\n");
999 void __init mp_config_acpi_legacy_irqs (void)
1001 struct mpc_config_intsrc intsrc;
1006 * Fabricate the legacy ISA bus (bus #31).
1008 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1009 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1012 * Older generations of ES7000 have no legacy identity mappings
1014 if (es7000_plat == 1)
1018 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1020 ioapic = mp_find_ioapic(0);
1024 intsrc.mpc_type = MP_INTSRC;
1025 intsrc.mpc_irqflag = 0; /* Conforming */
1026 intsrc.mpc_srcbus = MP_ISA_BUS;
1027 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1030 * Use the default configuration for the IRQs 0-15. Unless
1031 * overriden by (MADT) interrupt source override entries.
1033 for (i = 0; i < 16; i++) {
1036 for (idx = 0; idx < mp_irq_entries; idx++) {
1037 struct mpc_config_intsrc *irq = mp_irqs + idx;
1039 /* Do we already have a mapping for this ISA IRQ? */
1040 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1043 /* Do we already have a mapping for this IOAPIC pin */
1044 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1045 (irq->mpc_dstirq == i))
1049 if (idx != mp_irq_entries) {
1050 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1051 continue; /* IRQ already used */
1054 intsrc.mpc_irqtype = mp_INT;
1055 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1056 intsrc.mpc_dstirq = i;
1058 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1059 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1060 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1061 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1064 mp_irqs[mp_irq_entries] = intsrc;
1065 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1066 panic("Max # of irq sources exceeded!\n");
1070 #define MAX_GSI_NUM 4096
1072 int mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
1077 static int pci_irq = 16;
1079 * Mapping between Global System Interrups, which
1080 * represent all possible interrupts, and IRQs
1081 * assigned to actual devices.
1083 static int gsi_to_irq[MAX_GSI_NUM];
1085 /* Don't set up the ACPI SCI because it's already set up */
1086 if (acpi_fadt.sci_int == gsi)
1089 ioapic = mp_find_ioapic(gsi);
1091 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1095 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1097 if (ioapic_renumber_irq)
1098 gsi = ioapic_renumber_irq(ioapic, gsi);
1101 * Avoid pin reprogramming. PRTs typically include entries
1102 * with redundant pin->gsi mappings (but unique PCI devices);
1103 * we only program the IOAPIC on the first.
1105 bit = ioapic_pin % 32;
1106 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1108 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1109 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1113 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1114 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1115 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1116 return gsi_to_irq[gsi];
1119 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1123 * For PCI devices assign IRQs in order, avoiding gaps
1124 * due to unused I/O APIC pins.
1127 if (gsi < MAX_GSI_NUM) {
1131 * Don't assign IRQ used by ACPI SCI
1133 if (gsi == acpi_fadt.sci_int)
1135 gsi_to_irq[irq] = gsi;
1137 printk(KERN_ERR "GSI %u is too high\n", gsi);
1142 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1143 edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
1144 active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
1148 #endif /* CONFIG_X86_IO_APIC */
1149 #endif /* CONFIG_ACPI */