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;
41 #ifdef CONFIG_HOTPLUG_CPU
42 #define CPU_HOTPLUG_ENABLED (1)
44 #define CPU_HOTPLUG_ENABLED (0)
48 * Various Linux-internal data structures created from the
51 int apic_version [MAX_APICS];
52 int mp_bus_id_to_type [MAX_MP_BUSSES];
53 int mp_bus_id_to_node [MAX_MP_BUSSES];
54 int mp_bus_id_to_local [MAX_MP_BUSSES];
55 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
56 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
57 static int mp_current_pci_id;
59 /* I/O APIC entries */
60 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
62 /* # of MP IRQ source entries */
63 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
65 /* MP IRQ source entries */
71 unsigned long mp_lapic_addr;
73 unsigned int def_to_bigsmp = 0;
75 /* Processor that is doing the boot up */
76 unsigned int boot_cpu_physical_apicid = -1U;
77 /* Internal processor count */
78 static unsigned int __devinitdata num_processors;
80 /* Bitmask of physically existing CPUs */
81 physid_mask_t phys_cpu_present_map;
83 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
86 * Intel MP BIOS table parsing routines:
91 * Checksum an MP configuration block.
94 static int __init mpf_checksum(unsigned char *mp, int len)
105 * Have to match translation table entries to main table entries by counter
106 * hence the mpc_record variable .... can't see a less disgusting way of
110 static int mpc_record;
111 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
113 #ifdef CONFIG_X86_NUMAQ
114 static int MP_valid_apicid(int apicid, int version)
116 return hweight_long(apicid & 0xf) == 1 && (apicid >> 4) != 0xf;
119 static int MP_valid_apicid(int apicid, int version)
122 return apicid < 0xff;
128 static void __devinit MP_processor_info (struct mpc_config_processor *m)
131 physid_mask_t phys_cpu;
133 if (!(m->mpc_cpuflag & CPU_ENABLED))
136 apicid = mpc_apic_id(m, translation_table[mpc_record]);
138 if (m->mpc_featureflag&(1<<0))
139 Dprintk(" Floating point unit present.\n");
140 if (m->mpc_featureflag&(1<<7))
141 Dprintk(" Machine Exception supported.\n");
142 if (m->mpc_featureflag&(1<<8))
143 Dprintk(" 64 bit compare & exchange supported.\n");
144 if (m->mpc_featureflag&(1<<9))
145 Dprintk(" Internal APIC present.\n");
146 if (m->mpc_featureflag&(1<<11))
147 Dprintk(" SEP present.\n");
148 if (m->mpc_featureflag&(1<<12))
149 Dprintk(" MTRR present.\n");
150 if (m->mpc_featureflag&(1<<13))
151 Dprintk(" PGE present.\n");
152 if (m->mpc_featureflag&(1<<14))
153 Dprintk(" MCA present.\n");
154 if (m->mpc_featureflag&(1<<15))
155 Dprintk(" CMOV present.\n");
156 if (m->mpc_featureflag&(1<<16))
157 Dprintk(" PAT present.\n");
158 if (m->mpc_featureflag&(1<<17))
159 Dprintk(" PSE present.\n");
160 if (m->mpc_featureflag&(1<<18))
161 Dprintk(" PSN present.\n");
162 if (m->mpc_featureflag&(1<<19))
163 Dprintk(" Cache Line Flush Instruction present.\n");
165 if (m->mpc_featureflag&(1<<21))
166 Dprintk(" Debug Trace and EMON Store present.\n");
167 if (m->mpc_featureflag&(1<<22))
168 Dprintk(" ACPI Thermal Throttle Registers present.\n");
169 if (m->mpc_featureflag&(1<<23))
170 Dprintk(" MMX present.\n");
171 if (m->mpc_featureflag&(1<<24))
172 Dprintk(" FXSR present.\n");
173 if (m->mpc_featureflag&(1<<25))
174 Dprintk(" XMM present.\n");
175 if (m->mpc_featureflag&(1<<26))
176 Dprintk(" Willamette New Instructions present.\n");
177 if (m->mpc_featureflag&(1<<27))
178 Dprintk(" Self Snoop present.\n");
179 if (m->mpc_featureflag&(1<<28))
180 Dprintk(" HT present.\n");
181 if (m->mpc_featureflag&(1<<29))
182 Dprintk(" Thermal Monitor present.\n");
183 /* 30, 31 Reserved */
186 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
187 Dprintk(" Bootup CPU\n");
188 boot_cpu_physical_apicid = m->mpc_apicid;
191 ver = m->mpc_apicver;
193 if (!MP_valid_apicid(apicid, ver)) {
194 printk(KERN_WARNING "Processor #%d INVALID. (Max ID: %d).\n",
195 m->mpc_apicid, MAX_APICS);
203 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
204 "fixing up to 0x10. (tell your hw vendor)\n",
208 apic_version[m->mpc_apicid] = ver;
210 phys_cpu = apicid_to_cpu_present(apicid);
211 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
213 if (num_processors >= NR_CPUS) {
214 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
215 " Processor ignored.\n", NR_CPUS);
219 if (num_processors >= maxcpus) {
220 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
221 " Processor ignored.\n", maxcpus);
225 cpu_set(num_processors, cpu_possible_map);
228 if (CPU_HOTPLUG_ENABLED || (num_processors > 8)) {
229 switch (boot_cpu_data.x86_vendor) {
230 case X86_VENDOR_INTEL:
231 if (!APIC_XAPIC(ver)) {
235 /* If P4 and above fall through */
240 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
243 static void __init MP_bus_info (struct mpc_config_bus *m)
247 memcpy(str, m->mpc_bustype, 6);
250 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
252 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
253 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
254 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
255 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
256 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
257 mpc_oem_pci_bus(m, translation_table[mpc_record]);
258 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
259 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
261 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
262 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
263 } else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
264 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
266 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
270 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
272 if (!(m->mpc_flags & MPC_APIC_USABLE))
275 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
276 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
277 if (nr_ioapics >= MAX_IO_APICS) {
278 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
279 MAX_IO_APICS, nr_ioapics);
280 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
282 if (!m->mpc_apicaddr) {
283 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
284 " found in MP table, skipping!\n");
287 mp_ioapics[nr_ioapics] = *m;
291 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
293 mp_irqs [mp_irq_entries] = *m;
294 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
295 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
296 m->mpc_irqtype, m->mpc_irqflag & 3,
297 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
298 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
299 if (++mp_irq_entries == MAX_IRQ_SOURCES)
300 panic("Max # of irq sources exceeded!!\n");
303 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
305 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
306 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
307 m->mpc_irqtype, m->mpc_irqflag & 3,
308 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
309 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
311 * Well it seems all SMP boards in existence
312 * use ExtINT/LVT1 == LINT0 and
313 * NMI/LVT2 == LINT1 - the following check
314 * will show us if this assumptions is false.
315 * Until then we do not have to add baggage.
317 if ((m->mpc_irqtype == mp_ExtINT) &&
318 (m->mpc_destapiclint != 0))
320 if ((m->mpc_irqtype == mp_NMI) &&
321 (m->mpc_destapiclint != 1))
325 #ifdef CONFIG_X86_NUMAQ
326 static void __init MP_translation_info (struct mpc_config_translation *m)
328 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);
330 if (mpc_record >= MAX_MPC_ENTRY)
331 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
333 translation_table[mpc_record] = m; /* stash this for later */
334 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
335 node_set_online(m->trans_quad);
339 * Read/parse the MPC oem tables
342 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
343 unsigned short oemsize)
345 int count = sizeof (*oemtable); /* the header size */
346 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
349 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
350 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
352 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
353 oemtable->oem_signature[0],
354 oemtable->oem_signature[1],
355 oemtable->oem_signature[2],
356 oemtable->oem_signature[3]);
359 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
361 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
364 while (count < oemtable->oem_length) {
368 struct mpc_config_translation *m=
369 (struct mpc_config_translation *)oemptr;
370 MP_translation_info(m);
371 oemptr += sizeof(*m);
378 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
385 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
388 if (strncmp(oem, "IBM NUMA", 8))
389 printk("Warning! May not be a NUMA-Q system!\n");
391 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
394 #endif /* CONFIG_X86_NUMAQ */
400 static int __init smp_read_mpc(struct mp_config_table *mpc)
404 int count=sizeof(*mpc);
405 unsigned char *mpt=((unsigned char *)mpc)+count;
407 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
408 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
409 *(u32 *)mpc->mpc_signature);
412 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
413 printk(KERN_ERR "SMP mptable: checksum error!\n");
416 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
417 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
421 if (!mpc->mpc_lapic) {
422 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
425 memcpy(oem,mpc->mpc_oem,8);
427 printk(KERN_INFO "OEM ID: %s ",oem);
429 memcpy(str,mpc->mpc_productid,12);
431 printk("Product ID: %s ",str);
433 mps_oem_check(mpc, oem, str);
435 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
438 * Save the local APIC address (it might be non-default) -- but only
439 * if we're not using ACPI.
442 mp_lapic_addr = mpc->mpc_lapic;
445 * Now process the configuration blocks.
448 while (count < mpc->mpc_length) {
452 struct mpc_config_processor *m=
453 (struct mpc_config_processor *)mpt;
454 /* ACPI may have already provided this data */
456 MP_processor_info(m);
463 struct mpc_config_bus *m=
464 (struct mpc_config_bus *)mpt;
472 struct mpc_config_ioapic *m=
473 (struct mpc_config_ioapic *)mpt;
481 struct mpc_config_intsrc *m=
482 (struct mpc_config_intsrc *)mpt;
491 struct mpc_config_lintsrc *m=
492 (struct mpc_config_lintsrc *)mpt;
500 count = mpc->mpc_length;
506 clustered_apic_check();
508 printk(KERN_ERR "SMP mptable: no processors registered!\n");
509 return num_processors;
512 static int __init ELCR_trigger(unsigned int irq)
516 port = 0x4d0 + (irq >> 3);
517 return (inb(port) >> (irq & 7)) & 1;
520 static void __init construct_default_ioirq_mptable(int mpc_default_type)
522 struct mpc_config_intsrc intsrc;
524 int ELCR_fallback = 0;
526 intsrc.mpc_type = MP_INTSRC;
527 intsrc.mpc_irqflag = 0; /* conforming */
528 intsrc.mpc_srcbus = 0;
529 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
531 intsrc.mpc_irqtype = mp_INT;
534 * If true, we have an ISA/PCI system with no IRQ entries
535 * in the MP table. To prevent the PCI interrupts from being set up
536 * incorrectly, we try to use the ELCR. The sanity check to see if
537 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
538 * never be level sensitive, so we simply see if the ELCR agrees.
539 * If it does, we assume it's valid.
541 if (mpc_default_type == 5) {
542 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
544 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
545 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
547 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
552 for (i = 0; i < 16; i++) {
553 switch (mpc_default_type) {
555 if (i == 0 || i == 13)
556 continue; /* IRQ0 & IRQ13 not connected */
560 continue; /* IRQ2 is never connected */
565 * If the ELCR indicates a level-sensitive interrupt, we
566 * copy that information over to the MP table in the
567 * irqflag field (level sensitive, active high polarity).
570 intsrc.mpc_irqflag = 13;
572 intsrc.mpc_irqflag = 0;
575 intsrc.mpc_srcbusirq = i;
576 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
577 MP_intsrc_info(&intsrc);
580 intsrc.mpc_irqtype = mp_ExtINT;
581 intsrc.mpc_srcbusirq = 0;
582 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
583 MP_intsrc_info(&intsrc);
586 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
588 struct mpc_config_processor processor;
589 struct mpc_config_bus bus;
590 struct mpc_config_ioapic ioapic;
591 struct mpc_config_lintsrc lintsrc;
592 int linttypes[2] = { mp_ExtINT, mp_NMI };
596 * local APIC has default address
598 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
601 * 2 CPUs, numbered 0 & 1.
603 processor.mpc_type = MP_PROCESSOR;
604 /* Either an integrated APIC or a discrete 82489DX. */
605 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
606 processor.mpc_cpuflag = CPU_ENABLED;
607 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
608 (boot_cpu_data.x86_model << 4) |
609 boot_cpu_data.x86_mask;
610 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
611 processor.mpc_reserved[0] = 0;
612 processor.mpc_reserved[1] = 0;
613 for (i = 0; i < 2; i++) {
614 processor.mpc_apicid = i;
615 MP_processor_info(&processor);
618 bus.mpc_type = MP_BUS;
620 switch (mpc_default_type) {
623 printk(KERN_ERR "Unknown standard configuration %d\n",
628 memcpy(bus.mpc_bustype, "ISA ", 6);
633 memcpy(bus.mpc_bustype, "EISA ", 6);
637 memcpy(bus.mpc_bustype, "MCA ", 6);
640 if (mpc_default_type > 4) {
642 memcpy(bus.mpc_bustype, "PCI ", 6);
646 ioapic.mpc_type = MP_IOAPIC;
647 ioapic.mpc_apicid = 2;
648 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
649 ioapic.mpc_flags = MPC_APIC_USABLE;
650 ioapic.mpc_apicaddr = 0xFEC00000;
651 MP_ioapic_info(&ioapic);
654 * We set up most of the low 16 IO-APIC pins according to MPS rules.
656 construct_default_ioirq_mptable(mpc_default_type);
658 lintsrc.mpc_type = MP_LINTSRC;
659 lintsrc.mpc_irqflag = 0; /* conforming */
660 lintsrc.mpc_srcbusid = 0;
661 lintsrc.mpc_srcbusirq = 0;
662 lintsrc.mpc_destapic = MP_APIC_ALL;
663 for (i = 0; i < 2; i++) {
664 lintsrc.mpc_irqtype = linttypes[i];
665 lintsrc.mpc_destapiclint = i;
666 MP_lintsrc_info(&lintsrc);
670 static struct intel_mp_floating *mpf_found;
673 * Scan the memory blocks for an SMP configuration block.
675 void __init get_smp_config (void)
677 struct intel_mp_floating *mpf = mpf_found;
680 * ACPI supports both logical (e.g. Hyper-Threading) and physical
681 * processors, where MPS only supports physical.
683 if (acpi_lapic && acpi_ioapic) {
684 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
688 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
690 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
691 if (mpf->mpf_feature2 & (1<<7)) {
692 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
695 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
700 * Now see if we need to read further.
702 if (mpf->mpf_feature1 != 0) {
704 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
705 construct_default_ISA_mptable(mpf->mpf_feature1);
707 } else if (mpf->mpf_physptr) {
710 * Read the physical hardware table. Anything here will
711 * override the defaults.
713 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
714 smp_found_config = 0;
715 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
716 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
720 * If there are no explicit MP IRQ entries, then we are
721 * broken. We set up most of the low 16 IO-APIC pins to
722 * ISA defaults and hope it will work.
724 if (!mp_irq_entries) {
725 struct mpc_config_bus bus;
727 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
729 bus.mpc_type = MP_BUS;
731 memcpy(bus.mpc_bustype, "ISA ", 6);
734 construct_default_ioirq_mptable(0);
740 printk(KERN_INFO "Processors: %d\n", num_processors);
742 * Only use the first configuration found.
746 static int __init smp_scan_config (unsigned long base, unsigned long length)
748 unsigned long *bp = phys_to_virt(base);
749 struct intel_mp_floating *mpf;
751 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
752 if (sizeof(*mpf) != 16)
753 printk("Error: MPF size\n");
756 mpf = (struct intel_mp_floating *)bp;
757 if ((*bp == SMP_MAGIC_IDENT) &&
758 (mpf->mpf_length == 1) &&
759 !mpf_checksum((unsigned char *)bp, 16) &&
760 ((mpf->mpf_specification == 1)
761 || (mpf->mpf_specification == 4)) ) {
763 smp_found_config = 1;
764 printk(KERN_INFO "found SMP MP-table at %08lx\n",
766 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
767 if (mpf->mpf_physptr) {
769 * We cannot access to MPC table to compute
770 * table size yet, as only few megabytes from
771 * the bottom is mapped now.
772 * PC-9800's MPC table places on the very last
773 * of physical memory; so that simply reserving
774 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
775 * in reserve_bootmem.
777 unsigned long size = PAGE_SIZE;
778 unsigned long end = max_low_pfn * PAGE_SIZE;
779 if (mpf->mpf_physptr + size > end)
780 size = end - mpf->mpf_physptr;
781 reserve_bootmem(mpf->mpf_physptr, size);
793 void __init find_smp_config (void)
795 unsigned int address;
798 * FIXME: Linux assumes you have 640K of base ram..
799 * this continues the error...
801 * 1) Scan the bottom 1K for a signature
802 * 2) Scan the top 1K of base RAM
803 * 3) Scan the 64K of bios
805 if (smp_scan_config(0x0,0x400) ||
806 smp_scan_config(639*0x400,0x400) ||
807 smp_scan_config(0xF0000,0x10000))
810 * If it is an SMP machine we should know now, unless the
811 * configuration is in an EISA/MCA bus machine with an
812 * extended bios data area.
814 * there is a real-mode segmented pointer pointing to the
815 * 4K EBDA area at 0x40E, calculate and scan it here.
817 * NOTE! There are Linux loaders that will corrupt the EBDA
818 * area, and as such this kind of SMP config may be less
819 * trustworthy, simply because the SMP table may have been
820 * stomped on during early boot. These loaders are buggy and
823 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
826 address = get_bios_ebda();
828 smp_scan_config(address, 0x400);
833 /* --------------------------------------------------------------------------
834 ACPI-based MP Configuration
835 -------------------------------------------------------------------------- */
839 void __init mp_register_lapic_address (
842 mp_lapic_addr = (unsigned long) address;
844 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
846 if (boot_cpu_physical_apicid == -1U)
847 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
849 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
853 void __devinit mp_register_lapic (
857 struct mpc_config_processor processor;
860 if (MAX_APICS - id <= 0) {
861 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
866 if (id == boot_cpu_physical_apicid)
869 processor.mpc_type = MP_PROCESSOR;
870 processor.mpc_apicid = id;
871 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
872 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
873 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
874 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
875 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
876 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
877 processor.mpc_reserved[0] = 0;
878 processor.mpc_reserved[1] = 0;
880 MP_processor_info(&processor);
883 #ifdef CONFIG_X86_IO_APIC
886 #define MP_MAX_IOAPIC_PIN 127
888 static struct mp_ioapic_routing {
892 u32 pin_programmed[4];
893 } mp_ioapic_routing[MAX_IO_APICS];
896 static int mp_find_ioapic (
901 /* Find the IOAPIC that manages this GSI. */
902 for (i = 0; i < nr_ioapics; i++) {
903 if ((gsi >= mp_ioapic_routing[i].gsi_base)
904 && (gsi <= mp_ioapic_routing[i].gsi_end))
908 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
914 void __init mp_register_ioapic (
922 if (nr_ioapics >= MAX_IO_APICS) {
923 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
924 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
925 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
928 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
929 " found in MADT table, skipping!\n");
935 mp_ioapics[idx].mpc_type = MP_IOAPIC;
936 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
937 mp_ioapics[idx].mpc_apicaddr = address;
939 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
940 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
941 && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
942 tmpid = io_apic_get_unique_id(idx, id);
949 mp_ioapics[idx].mpc_apicid = tmpid;
950 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
953 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
954 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
956 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
957 mp_ioapic_routing[idx].gsi_base = gsi_base;
958 mp_ioapic_routing[idx].gsi_end = gsi_base +
959 io_apic_get_redir_entries(idx);
961 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
962 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
963 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
964 mp_ioapic_routing[idx].gsi_base,
965 mp_ioapic_routing[idx].gsi_end);
971 void __init mp_override_legacy_irq (
977 struct mpc_config_intsrc intsrc;
982 * Convert 'gsi' to 'ioapic.pin'.
984 ioapic = mp_find_ioapic(gsi);
987 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
990 * TBD: This check is for faulty timer entries, where the override
991 * erroneously sets the trigger to level, resulting in a HUGE
992 * increase of timer interrupts!
994 if ((bus_irq == 0) && (trigger == 3))
997 intsrc.mpc_type = MP_INTSRC;
998 intsrc.mpc_irqtype = mp_INT;
999 intsrc.mpc_irqflag = (trigger << 2) | polarity;
1000 intsrc.mpc_srcbus = MP_ISA_BUS;
1001 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
1002 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
1003 intsrc.mpc_dstirq = pin; /* INTIN# */
1005 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
1006 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1007 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1008 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
1010 mp_irqs[mp_irq_entries] = intsrc;
1011 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1012 panic("Max # of irq sources exceeded!\n");
1017 void __init mp_config_acpi_legacy_irqs (void)
1019 struct mpc_config_intsrc intsrc;
1024 * Fabricate the legacy ISA bus (bus #31).
1026 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1027 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1030 * Older generations of ES7000 have no legacy identity mappings
1032 if (es7000_plat == 1)
1036 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1038 ioapic = mp_find_ioapic(0);
1042 intsrc.mpc_type = MP_INTSRC;
1043 intsrc.mpc_irqflag = 0; /* Conforming */
1044 intsrc.mpc_srcbus = MP_ISA_BUS;
1045 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1048 * Use the default configuration for the IRQs 0-15. Unless
1049 * overriden by (MADT) interrupt source override entries.
1051 for (i = 0; i < 16; i++) {
1054 for (idx = 0; idx < mp_irq_entries; idx++) {
1055 struct mpc_config_intsrc *irq = mp_irqs + idx;
1057 /* Do we already have a mapping for this ISA IRQ? */
1058 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1061 /* Do we already have a mapping for this IOAPIC pin */
1062 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1063 (irq->mpc_dstirq == i))
1067 if (idx != mp_irq_entries) {
1068 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1069 continue; /* IRQ already used */
1072 intsrc.mpc_irqtype = mp_INT;
1073 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1074 intsrc.mpc_dstirq = i;
1076 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1077 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1078 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1079 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1082 mp_irqs[mp_irq_entries] = intsrc;
1083 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1084 panic("Max # of irq sources exceeded!\n");
1088 #define MAX_GSI_NUM 4096
1090 int mp_register_gsi (u32 gsi, int triggering, int polarity)
1095 static int pci_irq = 16;
1097 * Mapping between Global System Interrups, which
1098 * represent all possible interrupts, and IRQs
1099 * assigned to actual devices.
1101 static int gsi_to_irq[MAX_GSI_NUM];
1103 /* Don't set up the ACPI SCI because it's already set up */
1104 if (acpi_fadt.sci_int == gsi)
1107 ioapic = mp_find_ioapic(gsi);
1109 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1113 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1115 if (ioapic_renumber_irq)
1116 gsi = ioapic_renumber_irq(ioapic, gsi);
1119 * Avoid pin reprogramming. PRTs typically include entries
1120 * with redundant pin->gsi mappings (but unique PCI devices);
1121 * we only program the IOAPIC on the first.
1123 bit = ioapic_pin % 32;
1124 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1126 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1127 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1131 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1132 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1133 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1134 return gsi_to_irq[gsi];
1137 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1139 if (triggering == ACPI_LEVEL_SENSITIVE) {
1141 * For PCI devices assign IRQs in order, avoiding gaps
1142 * due to unused I/O APIC pins.
1145 if (gsi < MAX_GSI_NUM) {
1149 * Don't assign IRQ used by ACPI SCI
1151 if (gsi == acpi_fadt.sci_int)
1153 gsi_to_irq[irq] = gsi;
1155 printk(KERN_ERR "GSI %u is too high\n", gsi);
1160 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1161 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1162 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1166 #endif /* CONFIG_X86_IO_APIC */
1167 #endif /* CONFIG_ACPI */