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 static void __devinit MP_processor_info (struct mpc_config_processor *m)
110 physid_mask_t phys_cpu;
112 if (!(m->mpc_cpuflag & CPU_ENABLED))
115 apicid = mpc_apic_id(m, translation_table[mpc_record]);
117 if (m->mpc_featureflag&(1<<0))
118 Dprintk(" Floating point unit present.\n");
119 if (m->mpc_featureflag&(1<<7))
120 Dprintk(" Machine Exception supported.\n");
121 if (m->mpc_featureflag&(1<<8))
122 Dprintk(" 64 bit compare & exchange supported.\n");
123 if (m->mpc_featureflag&(1<<9))
124 Dprintk(" Internal APIC present.\n");
125 if (m->mpc_featureflag&(1<<11))
126 Dprintk(" SEP present.\n");
127 if (m->mpc_featureflag&(1<<12))
128 Dprintk(" MTRR present.\n");
129 if (m->mpc_featureflag&(1<<13))
130 Dprintk(" PGE present.\n");
131 if (m->mpc_featureflag&(1<<14))
132 Dprintk(" MCA present.\n");
133 if (m->mpc_featureflag&(1<<15))
134 Dprintk(" CMOV present.\n");
135 if (m->mpc_featureflag&(1<<16))
136 Dprintk(" PAT present.\n");
137 if (m->mpc_featureflag&(1<<17))
138 Dprintk(" PSE present.\n");
139 if (m->mpc_featureflag&(1<<18))
140 Dprintk(" PSN present.\n");
141 if (m->mpc_featureflag&(1<<19))
142 Dprintk(" Cache Line Flush Instruction present.\n");
144 if (m->mpc_featureflag&(1<<21))
145 Dprintk(" Debug Trace and EMON Store present.\n");
146 if (m->mpc_featureflag&(1<<22))
147 Dprintk(" ACPI Thermal Throttle Registers present.\n");
148 if (m->mpc_featureflag&(1<<23))
149 Dprintk(" MMX present.\n");
150 if (m->mpc_featureflag&(1<<24))
151 Dprintk(" FXSR present.\n");
152 if (m->mpc_featureflag&(1<<25))
153 Dprintk(" XMM present.\n");
154 if (m->mpc_featureflag&(1<<26))
155 Dprintk(" Willamette New Instructions present.\n");
156 if (m->mpc_featureflag&(1<<27))
157 Dprintk(" Self Snoop present.\n");
158 if (m->mpc_featureflag&(1<<28))
159 Dprintk(" HT present.\n");
160 if (m->mpc_featureflag&(1<<29))
161 Dprintk(" Thermal Monitor present.\n");
162 /* 30, 31 Reserved */
165 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
166 Dprintk(" Bootup CPU\n");
167 boot_cpu_physical_apicid = m->mpc_apicid;
170 ver = m->mpc_apicver;
176 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
177 "fixing up to 0x10. (tell your hw vendor)\n",
181 apic_version[m->mpc_apicid] = ver;
183 phys_cpu = apicid_to_cpu_present(apicid);
184 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
186 if (num_processors >= NR_CPUS) {
187 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
188 " Processor ignored.\n", NR_CPUS);
192 if (num_processors >= maxcpus) {
193 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
194 " Processor ignored.\n", maxcpus);
198 cpu_set(num_processors, cpu_possible_map);
202 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
203 * but we need to work other dependencies like SMP_SUSPEND etc
204 * before this can be done without some confusion.
205 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
206 * - Ashok Raj <ashok.raj@intel.com>
208 if (num_processors > 8) {
209 switch (boot_cpu_data.x86_vendor) {
210 case X86_VENDOR_INTEL:
211 if (!APIC_XAPIC(ver)) {
215 /* If P4 and above fall through */
220 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
223 static void __init MP_bus_info (struct mpc_config_bus *m)
227 memcpy(str, m->mpc_bustype, 6);
230 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
232 if (m->mpc_busid >= MAX_MP_BUSSES) {
233 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
234 " is too large, max. supported is %d\n",
235 m->mpc_busid, str, MAX_MP_BUSSES - 1);
239 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
240 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
241 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
242 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
243 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
244 mpc_oem_pci_bus(m, translation_table[mpc_record]);
245 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
246 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
248 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
249 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
250 } else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
251 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
253 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
257 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
259 if (!(m->mpc_flags & MPC_APIC_USABLE))
262 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
263 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
264 if (nr_ioapics >= MAX_IO_APICS) {
265 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
266 MAX_IO_APICS, nr_ioapics);
267 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
269 if (!m->mpc_apicaddr) {
270 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
271 " found in MP table, skipping!\n");
274 mp_ioapics[nr_ioapics] = *m;
278 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
280 mp_irqs [mp_irq_entries] = *m;
281 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
282 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
283 m->mpc_irqtype, m->mpc_irqflag & 3,
284 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
285 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
286 if (++mp_irq_entries == MAX_IRQ_SOURCES)
287 panic("Max # of irq sources exceeded!!\n");
290 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
292 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
293 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
294 m->mpc_irqtype, m->mpc_irqflag & 3,
295 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
296 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
298 * Well it seems all SMP boards in existence
299 * use ExtINT/LVT1 == LINT0 and
300 * NMI/LVT2 == LINT1 - the following check
301 * will show us if this assumptions is false.
302 * Until then we do not have to add baggage.
304 if ((m->mpc_irqtype == mp_ExtINT) &&
305 (m->mpc_destapiclint != 0))
307 if ((m->mpc_irqtype == mp_NMI) &&
308 (m->mpc_destapiclint != 1))
312 #ifdef CONFIG_X86_NUMAQ
313 static void __init MP_translation_info (struct mpc_config_translation *m)
315 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);
317 if (mpc_record >= MAX_MPC_ENTRY)
318 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
320 translation_table[mpc_record] = m; /* stash this for later */
321 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
322 node_set_online(m->trans_quad);
326 * Read/parse the MPC oem tables
329 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
330 unsigned short oemsize)
332 int count = sizeof (*oemtable); /* the header size */
333 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
336 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
337 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
339 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
340 oemtable->oem_signature[0],
341 oemtable->oem_signature[1],
342 oemtable->oem_signature[2],
343 oemtable->oem_signature[3]);
346 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
348 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
351 while (count < oemtable->oem_length) {
355 struct mpc_config_translation *m=
356 (struct mpc_config_translation *)oemptr;
357 MP_translation_info(m);
358 oemptr += sizeof(*m);
365 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
372 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
375 if (strncmp(oem, "IBM NUMA", 8))
376 printk("Warning! May not be a NUMA-Q system!\n");
378 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
381 #endif /* CONFIG_X86_NUMAQ */
387 static int __init smp_read_mpc(struct mp_config_table *mpc)
391 int count=sizeof(*mpc);
392 unsigned char *mpt=((unsigned char *)mpc)+count;
394 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
395 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
396 *(u32 *)mpc->mpc_signature);
399 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
400 printk(KERN_ERR "SMP mptable: checksum error!\n");
403 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
404 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
408 if (!mpc->mpc_lapic) {
409 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
412 memcpy(oem,mpc->mpc_oem,8);
414 printk(KERN_INFO "OEM ID: %s ",oem);
416 memcpy(str,mpc->mpc_productid,12);
418 printk("Product ID: %s ",str);
420 mps_oem_check(mpc, oem, str);
422 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
425 * Save the local APIC address (it might be non-default) -- but only
426 * if we're not using ACPI.
429 mp_lapic_addr = mpc->mpc_lapic;
432 * Now process the configuration blocks.
435 while (count < mpc->mpc_length) {
439 struct mpc_config_processor *m=
440 (struct mpc_config_processor *)mpt;
441 /* ACPI may have already provided this data */
443 MP_processor_info(m);
450 struct mpc_config_bus *m=
451 (struct mpc_config_bus *)mpt;
459 struct mpc_config_ioapic *m=
460 (struct mpc_config_ioapic *)mpt;
468 struct mpc_config_intsrc *m=
469 (struct mpc_config_intsrc *)mpt;
478 struct mpc_config_lintsrc *m=
479 (struct mpc_config_lintsrc *)mpt;
487 count = mpc->mpc_length;
493 clustered_apic_check();
495 printk(KERN_ERR "SMP mptable: no processors registered!\n");
496 return num_processors;
499 static int __init ELCR_trigger(unsigned int irq)
503 port = 0x4d0 + (irq >> 3);
504 return (inb(port) >> (irq & 7)) & 1;
507 static void __init construct_default_ioirq_mptable(int mpc_default_type)
509 struct mpc_config_intsrc intsrc;
511 int ELCR_fallback = 0;
513 intsrc.mpc_type = MP_INTSRC;
514 intsrc.mpc_irqflag = 0; /* conforming */
515 intsrc.mpc_srcbus = 0;
516 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
518 intsrc.mpc_irqtype = mp_INT;
521 * If true, we have an ISA/PCI system with no IRQ entries
522 * in the MP table. To prevent the PCI interrupts from being set up
523 * incorrectly, we try to use the ELCR. The sanity check to see if
524 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
525 * never be level sensitive, so we simply see if the ELCR agrees.
526 * If it does, we assume it's valid.
528 if (mpc_default_type == 5) {
529 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
531 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
532 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
534 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
539 for (i = 0; i < 16; i++) {
540 switch (mpc_default_type) {
542 if (i == 0 || i == 13)
543 continue; /* IRQ0 & IRQ13 not connected */
547 continue; /* IRQ2 is never connected */
552 * If the ELCR indicates a level-sensitive interrupt, we
553 * copy that information over to the MP table in the
554 * irqflag field (level sensitive, active high polarity).
557 intsrc.mpc_irqflag = 13;
559 intsrc.mpc_irqflag = 0;
562 intsrc.mpc_srcbusirq = i;
563 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
564 MP_intsrc_info(&intsrc);
567 intsrc.mpc_irqtype = mp_ExtINT;
568 intsrc.mpc_srcbusirq = 0;
569 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
570 MP_intsrc_info(&intsrc);
573 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
575 struct mpc_config_processor processor;
576 struct mpc_config_bus bus;
577 struct mpc_config_ioapic ioapic;
578 struct mpc_config_lintsrc lintsrc;
579 int linttypes[2] = { mp_ExtINT, mp_NMI };
583 * local APIC has default address
585 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
588 * 2 CPUs, numbered 0 & 1.
590 processor.mpc_type = MP_PROCESSOR;
591 /* Either an integrated APIC or a discrete 82489DX. */
592 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
593 processor.mpc_cpuflag = CPU_ENABLED;
594 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
595 (boot_cpu_data.x86_model << 4) |
596 boot_cpu_data.x86_mask;
597 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
598 processor.mpc_reserved[0] = 0;
599 processor.mpc_reserved[1] = 0;
600 for (i = 0; i < 2; i++) {
601 processor.mpc_apicid = i;
602 MP_processor_info(&processor);
605 bus.mpc_type = MP_BUS;
607 switch (mpc_default_type) {
610 printk(KERN_ERR "Unknown standard configuration %d\n",
615 memcpy(bus.mpc_bustype, "ISA ", 6);
620 memcpy(bus.mpc_bustype, "EISA ", 6);
624 memcpy(bus.mpc_bustype, "MCA ", 6);
627 if (mpc_default_type > 4) {
629 memcpy(bus.mpc_bustype, "PCI ", 6);
633 ioapic.mpc_type = MP_IOAPIC;
634 ioapic.mpc_apicid = 2;
635 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
636 ioapic.mpc_flags = MPC_APIC_USABLE;
637 ioapic.mpc_apicaddr = 0xFEC00000;
638 MP_ioapic_info(&ioapic);
641 * We set up most of the low 16 IO-APIC pins according to MPS rules.
643 construct_default_ioirq_mptable(mpc_default_type);
645 lintsrc.mpc_type = MP_LINTSRC;
646 lintsrc.mpc_irqflag = 0; /* conforming */
647 lintsrc.mpc_srcbusid = 0;
648 lintsrc.mpc_srcbusirq = 0;
649 lintsrc.mpc_destapic = MP_APIC_ALL;
650 for (i = 0; i < 2; i++) {
651 lintsrc.mpc_irqtype = linttypes[i];
652 lintsrc.mpc_destapiclint = i;
653 MP_lintsrc_info(&lintsrc);
657 static struct intel_mp_floating *mpf_found;
660 * Scan the memory blocks for an SMP configuration block.
662 void __init get_smp_config (void)
664 struct intel_mp_floating *mpf = mpf_found;
667 * ACPI supports both logical (e.g. Hyper-Threading) and physical
668 * processors, where MPS only supports physical.
670 if (acpi_lapic && acpi_ioapic) {
671 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
675 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
677 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
678 if (mpf->mpf_feature2 & (1<<7)) {
679 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
682 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
687 * Now see if we need to read further.
689 if (mpf->mpf_feature1 != 0) {
691 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
692 construct_default_ISA_mptable(mpf->mpf_feature1);
694 } else if (mpf->mpf_physptr) {
697 * Read the physical hardware table. Anything here will
698 * override the defaults.
700 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
701 smp_found_config = 0;
702 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
703 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
707 * If there are no explicit MP IRQ entries, then we are
708 * broken. We set up most of the low 16 IO-APIC pins to
709 * ISA defaults and hope it will work.
711 if (!mp_irq_entries) {
712 struct mpc_config_bus bus;
714 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
716 bus.mpc_type = MP_BUS;
718 memcpy(bus.mpc_bustype, "ISA ", 6);
721 construct_default_ioirq_mptable(0);
727 printk(KERN_INFO "Processors: %d\n", num_processors);
729 * Only use the first configuration found.
733 static int __init smp_scan_config (unsigned long base, unsigned long length)
735 unsigned long *bp = phys_to_virt(base);
736 struct intel_mp_floating *mpf;
738 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
739 if (sizeof(*mpf) != 16)
740 printk("Error: MPF size\n");
743 mpf = (struct intel_mp_floating *)bp;
744 if ((*bp == SMP_MAGIC_IDENT) &&
745 (mpf->mpf_length == 1) &&
746 !mpf_checksum((unsigned char *)bp, 16) &&
747 ((mpf->mpf_specification == 1)
748 || (mpf->mpf_specification == 4)) ) {
750 smp_found_config = 1;
751 printk(KERN_INFO "found SMP MP-table at %08lx\n",
753 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
754 if (mpf->mpf_physptr) {
756 * We cannot access to MPC table to compute
757 * table size yet, as only few megabytes from
758 * the bottom is mapped now.
759 * PC-9800's MPC table places on the very last
760 * of physical memory; so that simply reserving
761 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
762 * in reserve_bootmem.
764 unsigned long size = PAGE_SIZE;
765 unsigned long end = max_low_pfn * PAGE_SIZE;
766 if (mpf->mpf_physptr + size > end)
767 size = end - mpf->mpf_physptr;
768 reserve_bootmem(mpf->mpf_physptr, size);
780 void __init find_smp_config (void)
782 unsigned int address;
785 * FIXME: Linux assumes you have 640K of base ram..
786 * this continues the error...
788 * 1) Scan the bottom 1K for a signature
789 * 2) Scan the top 1K of base RAM
790 * 3) Scan the 64K of bios
792 if (smp_scan_config(0x0,0x400) ||
793 smp_scan_config(639*0x400,0x400) ||
794 smp_scan_config(0xF0000,0x10000))
797 * If it is an SMP machine we should know now, unless the
798 * configuration is in an EISA/MCA bus machine with an
799 * extended bios data area.
801 * there is a real-mode segmented pointer pointing to the
802 * 4K EBDA area at 0x40E, calculate and scan it here.
804 * NOTE! There are Linux loaders that will corrupt the EBDA
805 * area, and as such this kind of SMP config may be less
806 * trustworthy, simply because the SMP table may have been
807 * stomped on during early boot. These loaders are buggy and
810 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
813 address = get_bios_ebda();
815 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 (
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)
928 && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
929 tmpid = io_apic_get_unique_id(idx, id);
936 mp_ioapics[idx].mpc_apicid = tmpid;
937 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
940 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
941 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
943 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
944 mp_ioapic_routing[idx].gsi_base = gsi_base;
945 mp_ioapic_routing[idx].gsi_end = gsi_base +
946 io_apic_get_redir_entries(idx);
948 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
949 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
950 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
951 mp_ioapic_routing[idx].gsi_base,
952 mp_ioapic_routing[idx].gsi_end);
958 void __init mp_override_legacy_irq (
964 struct mpc_config_intsrc intsrc;
969 * Convert 'gsi' to 'ioapic.pin'.
971 ioapic = mp_find_ioapic(gsi);
974 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
977 * TBD: This check is for faulty timer entries, where the override
978 * erroneously sets the trigger to level, resulting in a HUGE
979 * increase of timer interrupts!
981 if ((bus_irq == 0) && (trigger == 3))
984 intsrc.mpc_type = MP_INTSRC;
985 intsrc.mpc_irqtype = mp_INT;
986 intsrc.mpc_irqflag = (trigger << 2) | polarity;
987 intsrc.mpc_srcbus = MP_ISA_BUS;
988 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
989 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
990 intsrc.mpc_dstirq = pin; /* INTIN# */
992 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
993 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
994 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
995 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
997 mp_irqs[mp_irq_entries] = intsrc;
998 if (++mp_irq_entries == MAX_IRQ_SOURCES)
999 panic("Max # of irq sources exceeded!\n");
1004 void __init mp_config_acpi_legacy_irqs (void)
1006 struct mpc_config_intsrc intsrc;
1011 * Fabricate the legacy ISA bus (bus #31).
1013 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1014 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1017 * Older generations of ES7000 have no legacy identity mappings
1019 if (es7000_plat == 1)
1023 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1025 ioapic = mp_find_ioapic(0);
1029 intsrc.mpc_type = MP_INTSRC;
1030 intsrc.mpc_irqflag = 0; /* Conforming */
1031 intsrc.mpc_srcbus = MP_ISA_BUS;
1032 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1035 * Use the default configuration for the IRQs 0-15. Unless
1036 * overriden by (MADT) interrupt source override entries.
1038 for (i = 0; i < 16; i++) {
1041 for (idx = 0; idx < mp_irq_entries; idx++) {
1042 struct mpc_config_intsrc *irq = mp_irqs + idx;
1044 /* Do we already have a mapping for this ISA IRQ? */
1045 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1048 /* Do we already have a mapping for this IOAPIC pin */
1049 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1050 (irq->mpc_dstirq == i))
1054 if (idx != mp_irq_entries) {
1055 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1056 continue; /* IRQ already used */
1059 intsrc.mpc_irqtype = mp_INT;
1060 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1061 intsrc.mpc_dstirq = i;
1063 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1064 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1065 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1066 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1069 mp_irqs[mp_irq_entries] = intsrc;
1070 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1071 panic("Max # of irq sources exceeded!\n");
1075 #define MAX_GSI_NUM 4096
1077 int mp_register_gsi (u32 gsi, int triggering, int polarity)
1082 static int pci_irq = 16;
1084 * Mapping between Global System Interrups, which
1085 * represent all possible interrupts, and IRQs
1086 * assigned to actual devices.
1088 static int gsi_to_irq[MAX_GSI_NUM];
1090 /* Don't set up the ACPI SCI because it's already set up */
1091 if (acpi_fadt.sci_int == gsi)
1094 ioapic = mp_find_ioapic(gsi);
1096 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1100 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1102 if (ioapic_renumber_irq)
1103 gsi = ioapic_renumber_irq(ioapic, gsi);
1106 * Avoid pin reprogramming. PRTs typically include entries
1107 * with redundant pin->gsi mappings (but unique PCI devices);
1108 * we only program the IOAPIC on the first.
1110 bit = ioapic_pin % 32;
1111 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1113 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1114 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1118 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1119 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1120 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1121 return gsi_to_irq[gsi];
1124 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1126 if (triggering == ACPI_LEVEL_SENSITIVE) {
1128 * For PCI devices assign IRQs in order, avoiding gaps
1129 * due to unused I/O APIC pins.
1132 if (gsi < MAX_GSI_NUM) {
1134 * Retain the VIA chipset work-around (gsi > 15), but
1135 * avoid a problem where the 8254 timer (IRQ0) is setup
1136 * via an override (so it's not on pin 0 of the ioapic),
1137 * and at the same time, the pin 0 interrupt is a PCI
1138 * type. The gsi > 15 test could cause these two pins
1139 * to be shared as IRQ0, and they are not shareable.
1140 * So test for this condition, and if necessary, avoid
1141 * the pin collision.
1143 if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
1146 * Don't assign IRQ used by ACPI SCI
1148 if (gsi == acpi_fadt.sci_int)
1150 gsi_to_irq[irq] = gsi;
1152 printk(KERN_ERR "GSI %u is too high\n", gsi);
1157 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1158 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1159 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1163 #endif /* CONFIG_X86_IO_APIC */
1164 #endif /* CONFIG_ACPI */