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/irq.h>
18 #include <linux/init.h>
19 #include <linux/acpi.h>
20 #include <linux/delay.h>
21 #include <linux/config.h>
22 #include <linux/bootmem.h>
23 #include <linux/smp_lock.h>
24 #include <linux/kernel_stat.h>
25 #include <linux/mc146818rtc.h>
26 #include <linux/bitops.h>
31 #include <asm/mpspec.h>
32 #include <asm/io_apic.h>
34 #include <mach_apic.h>
35 #include <mach_mpparse.h>
36 #include <bios_ebda.h>
38 /* Have we found an MP table */
40 unsigned int __initdata maxcpus = NR_CPUS;
43 * Various Linux-internal data structures created from the
46 int apic_version [MAX_APICS];
47 int mp_bus_id_to_type [MAX_MP_BUSSES];
48 int mp_bus_id_to_node [MAX_MP_BUSSES];
49 int mp_bus_id_to_local [MAX_MP_BUSSES];
50 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
51 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
52 static int mp_current_pci_id;
54 /* I/O APIC entries */
55 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
57 /* # of MP IRQ source entries */
58 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
60 /* MP IRQ source entries */
66 unsigned long mp_lapic_addr;
68 unsigned int def_to_bigsmp = 0;
70 /* Processor that is doing the boot up */
71 unsigned int boot_cpu_physical_apicid = -1U;
72 /* Internal processor count */
73 static unsigned int __initdata num_processors;
75 /* Bitmask of physically existing CPUs */
76 physid_mask_t phys_cpu_present_map;
78 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
81 * Intel MP BIOS table parsing routines:
86 * Checksum an MP configuration block.
89 static int __init mpf_checksum(unsigned char *mp, int len)
100 * Have to match translation table entries to main table entries by counter
101 * hence the mpc_record variable .... can't see a less disgusting way of
105 static int mpc_record;
106 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
108 #ifdef CONFIG_X86_NUMAQ
109 static int MP_valid_apicid(int apicid, int version)
111 return hweight_long(apicid & 0xf) == 1 && (apicid >> 4) != 0xf;
114 static int MP_valid_apicid(int apicid, int version)
117 return apicid < 0xff;
123 static void __init MP_processor_info (struct mpc_config_processor *m)
125 int ver, apicid, cpu, found_bsp = 0;
128 if (!(m->mpc_cpuflag & CPU_ENABLED))
131 apicid = mpc_apic_id(m, translation_table[mpc_record]);
133 if (m->mpc_featureflag&(1<<0))
134 Dprintk(" Floating point unit present.\n");
135 if (m->mpc_featureflag&(1<<7))
136 Dprintk(" Machine Exception supported.\n");
137 if (m->mpc_featureflag&(1<<8))
138 Dprintk(" 64 bit compare & exchange supported.\n");
139 if (m->mpc_featureflag&(1<<9))
140 Dprintk(" Internal APIC present.\n");
141 if (m->mpc_featureflag&(1<<11))
142 Dprintk(" SEP present.\n");
143 if (m->mpc_featureflag&(1<<12))
144 Dprintk(" MTRR present.\n");
145 if (m->mpc_featureflag&(1<<13))
146 Dprintk(" PGE present.\n");
147 if (m->mpc_featureflag&(1<<14))
148 Dprintk(" MCA present.\n");
149 if (m->mpc_featureflag&(1<<15))
150 Dprintk(" CMOV present.\n");
151 if (m->mpc_featureflag&(1<<16))
152 Dprintk(" PAT present.\n");
153 if (m->mpc_featureflag&(1<<17))
154 Dprintk(" PSE present.\n");
155 if (m->mpc_featureflag&(1<<18))
156 Dprintk(" PSN present.\n");
157 if (m->mpc_featureflag&(1<<19))
158 Dprintk(" Cache Line Flush Instruction present.\n");
160 if (m->mpc_featureflag&(1<<21))
161 Dprintk(" Debug Trace and EMON Store present.\n");
162 if (m->mpc_featureflag&(1<<22))
163 Dprintk(" ACPI Thermal Throttle Registers present.\n");
164 if (m->mpc_featureflag&(1<<23))
165 Dprintk(" MMX present.\n");
166 if (m->mpc_featureflag&(1<<24))
167 Dprintk(" FXSR present.\n");
168 if (m->mpc_featureflag&(1<<25))
169 Dprintk(" XMM present.\n");
170 if (m->mpc_featureflag&(1<<26))
171 Dprintk(" Willamette New Instructions present.\n");
172 if (m->mpc_featureflag&(1<<27))
173 Dprintk(" Self Snoop present.\n");
174 if (m->mpc_featureflag&(1<<28))
175 Dprintk(" HT present.\n");
176 if (m->mpc_featureflag&(1<<29))
177 Dprintk(" Thermal Monitor present.\n");
178 /* 30, 31 Reserved */
181 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
182 Dprintk(" Bootup CPU\n");
183 boot_cpu_physical_apicid = m->mpc_apicid;
187 if (num_processors >= NR_CPUS) {
188 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
189 " Processor ignored.\n", NR_CPUS);
193 if (num_processors >= maxcpus) {
194 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
195 " Processor ignored.\n", maxcpus);
199 ver = m->mpc_apicver;
201 if (!MP_valid_apicid(apicid, ver)) {
202 printk(KERN_WARNING "Processor #%d INVALID. (Max ID: %d).\n",
203 m->mpc_apicid, MAX_APICS);
211 cpu = num_processors - 1;
212 cpu_set(cpu, cpu_possible_map);
213 tmp = apicid_to_cpu_present(apicid);
214 physids_or(phys_cpu_present_map, phys_cpu_present_map, tmp);
220 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
223 apic_version[m->mpc_apicid] = ver;
224 if ((num_processors > 8) &&
226 (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
231 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
234 static void __init MP_bus_info (struct mpc_config_bus *m)
238 memcpy(str, m->mpc_bustype, 6);
241 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
243 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
244 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
245 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
246 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
247 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
248 mpc_oem_pci_bus(m, translation_table[mpc_record]);
249 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
250 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
252 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
253 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
254 } else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
255 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
257 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
261 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
263 if (!(m->mpc_flags & MPC_APIC_USABLE))
266 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
267 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
268 if (nr_ioapics >= MAX_IO_APICS) {
269 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
270 MAX_IO_APICS, nr_ioapics);
271 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
273 if (!m->mpc_apicaddr) {
274 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
275 " found in MP table, skipping!\n");
278 mp_ioapics[nr_ioapics] = *m;
282 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
284 mp_irqs [mp_irq_entries] = *m;
285 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
286 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
287 m->mpc_irqtype, m->mpc_irqflag & 3,
288 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
289 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
290 if (++mp_irq_entries == MAX_IRQ_SOURCES)
291 panic("Max # of irq sources exceeded!!\n");
294 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
296 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
297 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
298 m->mpc_irqtype, m->mpc_irqflag & 3,
299 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
300 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
302 * Well it seems all SMP boards in existence
303 * use ExtINT/LVT1 == LINT0 and
304 * NMI/LVT2 == LINT1 - the following check
305 * will show us if this assumptions is false.
306 * Until then we do not have to add baggage.
308 if ((m->mpc_irqtype == mp_ExtINT) &&
309 (m->mpc_destapiclint != 0))
311 if ((m->mpc_irqtype == mp_NMI) &&
312 (m->mpc_destapiclint != 1))
316 #ifdef CONFIG_X86_NUMAQ
317 static void __init MP_translation_info (struct mpc_config_translation *m)
319 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);
321 if (mpc_record >= MAX_MPC_ENTRY)
322 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
324 translation_table[mpc_record] = m; /* stash this for later */
325 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
326 node_set_online(m->trans_quad);
330 * Read/parse the MPC oem tables
333 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
334 unsigned short oemsize)
336 int count = sizeof (*oemtable); /* the header size */
337 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
340 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
341 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
343 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
344 oemtable->oem_signature[0],
345 oemtable->oem_signature[1],
346 oemtable->oem_signature[2],
347 oemtable->oem_signature[3]);
350 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
352 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
355 while (count < oemtable->oem_length) {
359 struct mpc_config_translation *m=
360 (struct mpc_config_translation *)oemptr;
361 MP_translation_info(m);
362 oemptr += sizeof(*m);
369 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
376 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
379 if (strncmp(oem, "IBM NUMA", 8))
380 printk("Warning! May not be a NUMA-Q system!\n");
382 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
385 #endif /* CONFIG_X86_NUMAQ */
391 static int __init smp_read_mpc(struct mp_config_table *mpc)
395 int count=sizeof(*mpc);
396 unsigned char *mpt=((unsigned char *)mpc)+count;
398 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
399 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
400 *(u32 *)mpc->mpc_signature);
403 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
404 printk(KERN_ERR "SMP mptable: checksum error!\n");
407 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
408 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
412 if (!mpc->mpc_lapic) {
413 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
416 memcpy(oem,mpc->mpc_oem,8);
418 printk(KERN_INFO "OEM ID: %s ",oem);
420 memcpy(str,mpc->mpc_productid,12);
422 printk("Product ID: %s ",str);
424 mps_oem_check(mpc, oem, str);
426 printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
429 * Save the local APIC address (it might be non-default) -- but only
430 * if we're not using ACPI.
433 mp_lapic_addr = mpc->mpc_lapic;
436 * Now process the configuration blocks.
439 while (count < mpc->mpc_length) {
443 struct mpc_config_processor *m=
444 (struct mpc_config_processor *)mpt;
445 /* ACPI may have already provided this data */
447 MP_processor_info(m);
454 struct mpc_config_bus *m=
455 (struct mpc_config_bus *)mpt;
463 struct mpc_config_ioapic *m=
464 (struct mpc_config_ioapic *)mpt;
472 struct mpc_config_intsrc *m=
473 (struct mpc_config_intsrc *)mpt;
482 struct mpc_config_lintsrc *m=
483 (struct mpc_config_lintsrc *)mpt;
491 count = mpc->mpc_length;
497 clustered_apic_check();
499 printk(KERN_ERR "SMP mptable: no processors registered!\n");
500 return num_processors;
503 static int __init ELCR_trigger(unsigned int irq)
507 port = 0x4d0 + (irq >> 3);
508 return (inb(port) >> (irq & 7)) & 1;
511 static void __init construct_default_ioirq_mptable(int mpc_default_type)
513 struct mpc_config_intsrc intsrc;
515 int ELCR_fallback = 0;
517 intsrc.mpc_type = MP_INTSRC;
518 intsrc.mpc_irqflag = 0; /* conforming */
519 intsrc.mpc_srcbus = 0;
520 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
522 intsrc.mpc_irqtype = mp_INT;
525 * If true, we have an ISA/PCI system with no IRQ entries
526 * in the MP table. To prevent the PCI interrupts from being set up
527 * incorrectly, we try to use the ELCR. The sanity check to see if
528 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
529 * never be level sensitive, so we simply see if the ELCR agrees.
530 * If it does, we assume it's valid.
532 if (mpc_default_type == 5) {
533 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
535 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
536 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
538 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
543 for (i = 0; i < 16; i++) {
544 switch (mpc_default_type) {
546 if (i == 0 || i == 13)
547 continue; /* IRQ0 & IRQ13 not connected */
551 continue; /* IRQ2 is never connected */
556 * If the ELCR indicates a level-sensitive interrupt, we
557 * copy that information over to the MP table in the
558 * irqflag field (level sensitive, active high polarity).
561 intsrc.mpc_irqflag = 13;
563 intsrc.mpc_irqflag = 0;
566 intsrc.mpc_srcbusirq = i;
567 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
568 MP_intsrc_info(&intsrc);
571 intsrc.mpc_irqtype = mp_ExtINT;
572 intsrc.mpc_srcbusirq = 0;
573 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
574 MP_intsrc_info(&intsrc);
577 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
579 struct mpc_config_processor processor;
580 struct mpc_config_bus bus;
581 struct mpc_config_ioapic ioapic;
582 struct mpc_config_lintsrc lintsrc;
583 int linttypes[2] = { mp_ExtINT, mp_NMI };
587 * local APIC has default address
589 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
592 * 2 CPUs, numbered 0 & 1.
594 processor.mpc_type = MP_PROCESSOR;
595 /* Either an integrated APIC or a discrete 82489DX. */
596 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
597 processor.mpc_cpuflag = CPU_ENABLED;
598 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
599 (boot_cpu_data.x86_model << 4) |
600 boot_cpu_data.x86_mask;
601 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
602 processor.mpc_reserved[0] = 0;
603 processor.mpc_reserved[1] = 0;
604 for (i = 0; i < 2; i++) {
605 processor.mpc_apicid = i;
606 MP_processor_info(&processor);
609 bus.mpc_type = MP_BUS;
611 switch (mpc_default_type) {
614 printk(KERN_ERR "Unknown standard configuration %d\n",
619 memcpy(bus.mpc_bustype, "ISA ", 6);
624 memcpy(bus.mpc_bustype, "EISA ", 6);
628 memcpy(bus.mpc_bustype, "MCA ", 6);
631 if (mpc_default_type > 4) {
633 memcpy(bus.mpc_bustype, "PCI ", 6);
637 ioapic.mpc_type = MP_IOAPIC;
638 ioapic.mpc_apicid = 2;
639 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
640 ioapic.mpc_flags = MPC_APIC_USABLE;
641 ioapic.mpc_apicaddr = 0xFEC00000;
642 MP_ioapic_info(&ioapic);
645 * We set up most of the low 16 IO-APIC pins according to MPS rules.
647 construct_default_ioirq_mptable(mpc_default_type);
649 lintsrc.mpc_type = MP_LINTSRC;
650 lintsrc.mpc_irqflag = 0; /* conforming */
651 lintsrc.mpc_srcbusid = 0;
652 lintsrc.mpc_srcbusirq = 0;
653 lintsrc.mpc_destapic = MP_APIC_ALL;
654 for (i = 0; i < 2; i++) {
655 lintsrc.mpc_irqtype = linttypes[i];
656 lintsrc.mpc_destapiclint = i;
657 MP_lintsrc_info(&lintsrc);
661 static struct intel_mp_floating *mpf_found;
664 * Scan the memory blocks for an SMP configuration block.
666 void __init get_smp_config (void)
668 struct intel_mp_floating *mpf = mpf_found;
671 * ACPI may be used to obtain the entire SMP configuration or just to
672 * enumerate/configure processors (CONFIG_ACPI_BOOT). Note that
673 * ACPI supports both logical (e.g. Hyper-Threading) and physical
674 * processors, where MPS only supports physical.
676 if (acpi_lapic && acpi_ioapic) {
677 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
681 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
683 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
684 if (mpf->mpf_feature2 & (1<<7)) {
685 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
688 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
693 * Now see if we need to read further.
695 if (mpf->mpf_feature1 != 0) {
697 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
698 construct_default_ISA_mptable(mpf->mpf_feature1);
700 } else if (mpf->mpf_physptr) {
703 * Read the physical hardware table. Anything here will
704 * override the defaults.
706 if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
707 smp_found_config = 0;
708 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
709 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
713 * If there are no explicit MP IRQ entries, then we are
714 * broken. We set up most of the low 16 IO-APIC pins to
715 * ISA defaults and hope it will work.
717 if (!mp_irq_entries) {
718 struct mpc_config_bus bus;
720 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
722 bus.mpc_type = MP_BUS;
724 memcpy(bus.mpc_bustype, "ISA ", 6);
727 construct_default_ioirq_mptable(0);
733 printk(KERN_INFO "Processors: %d\n", num_processors);
735 * Only use the first configuration found.
739 static int __init smp_scan_config (unsigned long base, unsigned long length)
741 unsigned long *bp = phys_to_virt(base);
742 struct intel_mp_floating *mpf;
744 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
745 if (sizeof(*mpf) != 16)
746 printk("Error: MPF size\n");
749 mpf = (struct intel_mp_floating *)bp;
750 if ((*bp == SMP_MAGIC_IDENT) &&
751 (mpf->mpf_length == 1) &&
752 !mpf_checksum((unsigned char *)bp, 16) &&
753 ((mpf->mpf_specification == 1)
754 || (mpf->mpf_specification == 4)) ) {
756 smp_found_config = 1;
757 printk(KERN_INFO "found SMP MP-table at %08lx\n",
759 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
760 if (mpf->mpf_physptr) {
762 * We cannot access to MPC table to compute
763 * table size yet, as only few megabytes from
764 * the bottom is mapped now.
765 * PC-9800's MPC table places on the very last
766 * of physical memory; so that simply reserving
767 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
768 * in reserve_bootmem.
770 unsigned long size = PAGE_SIZE;
771 unsigned long end = max_low_pfn * PAGE_SIZE;
772 if (mpf->mpf_physptr + size > end)
773 size = end - mpf->mpf_physptr;
774 reserve_bootmem(mpf->mpf_physptr, size);
786 void __init find_smp_config (void)
788 unsigned int address;
791 * FIXME: Linux assumes you have 640K of base ram..
792 * this continues the error...
794 * 1) Scan the bottom 1K for a signature
795 * 2) Scan the top 1K of base RAM
796 * 3) Scan the 64K of bios
798 if (smp_scan_config(0x0,0x400) ||
799 smp_scan_config(639*0x400,0x400) ||
800 smp_scan_config(0xF0000,0x10000))
803 * If it is an SMP machine we should know now, unless the
804 * configuration is in an EISA/MCA bus machine with an
805 * extended bios data area.
807 * there is a real-mode segmented pointer pointing to the
808 * 4K EBDA area at 0x40E, calculate and scan it here.
810 * NOTE! There are Linux loaders that will corrupt the EBDA
811 * area, and as such this kind of SMP config may be less
812 * trustworthy, simply because the SMP table may have been
813 * stomped on during early boot. These loaders are buggy and
816 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
819 address = get_bios_ebda();
821 smp_scan_config(address, 0x400);
824 /* --------------------------------------------------------------------------
825 ACPI-based MP Configuration
826 -------------------------------------------------------------------------- */
828 #ifdef CONFIG_ACPI_BOOT
830 void __init mp_register_lapic_address (
833 mp_lapic_addr = (unsigned long) address;
835 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
837 if (boot_cpu_physical_apicid == -1U)
838 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
840 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
844 void __init mp_register_lapic (
848 struct mpc_config_processor processor;
851 if (MAX_APICS - id <= 0) {
852 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
857 if (id == boot_cpu_physical_apicid)
860 processor.mpc_type = MP_PROCESSOR;
861 processor.mpc_apicid = id;
862 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
863 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
864 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
865 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
866 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
867 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
868 processor.mpc_reserved[0] = 0;
869 processor.mpc_reserved[1] = 0;
871 MP_processor_info(&processor);
874 #if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_ACPI_BOOT))
877 #define MP_MAX_IOAPIC_PIN 127
879 static struct mp_ioapic_routing {
883 u32 pin_programmed[4];
884 } mp_ioapic_routing[MAX_IO_APICS];
887 static int mp_find_ioapic (
892 /* Find the IOAPIC that manages this GSI. */
893 for (i = 0; i < nr_ioapics; i++) {
894 if ((gsi >= mp_ioapic_routing[i].gsi_base)
895 && (gsi <= mp_ioapic_routing[i].gsi_end))
899 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
905 void __init mp_register_ioapic (
912 if (nr_ioapics >= MAX_IO_APICS) {
913 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
914 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
915 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
918 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
919 " found in MADT table, skipping!\n");
925 mp_ioapics[idx].mpc_type = MP_IOAPIC;
926 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
927 mp_ioapics[idx].mpc_apicaddr = address;
929 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
930 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))
931 mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
933 mp_ioapics[idx].mpc_apicid = id;
934 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
937 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
938 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
940 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
941 mp_ioapic_routing[idx].gsi_base = gsi_base;
942 mp_ioapic_routing[idx].gsi_end = gsi_base +
943 io_apic_get_redir_entries(idx);
945 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
946 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
947 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
948 mp_ioapic_routing[idx].gsi_base,
949 mp_ioapic_routing[idx].gsi_end);
955 void __init mp_override_legacy_irq (
961 struct mpc_config_intsrc intsrc;
966 * Convert 'gsi' to 'ioapic.pin'.
968 ioapic = mp_find_ioapic(gsi);
971 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
974 * TBD: This check is for faulty timer entries, where the override
975 * erroneously sets the trigger to level, resulting in a HUGE
976 * increase of timer interrupts!
978 if ((bus_irq == 0) && (trigger == 3))
981 intsrc.mpc_type = MP_INTSRC;
982 intsrc.mpc_irqtype = mp_INT;
983 intsrc.mpc_irqflag = (trigger << 2) | polarity;
984 intsrc.mpc_srcbus = MP_ISA_BUS;
985 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
986 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
987 intsrc.mpc_dstirq = pin; /* INTIN# */
989 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
990 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
991 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
992 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
994 mp_irqs[mp_irq_entries] = intsrc;
995 if (++mp_irq_entries == MAX_IRQ_SOURCES)
996 panic("Max # of irq sources exceeded!\n");
1003 void __init mp_config_acpi_legacy_irqs (void)
1005 struct mpc_config_intsrc intsrc;
1010 * Fabricate the legacy ISA bus (bus #31).
1012 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1013 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
1016 * Older generations of ES7000 have no legacy identity mappings
1018 if (es7000_plat == 1)
1022 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1024 ioapic = mp_find_ioapic(0);
1028 intsrc.mpc_type = MP_INTSRC;
1029 intsrc.mpc_irqflag = 0; /* Conforming */
1030 intsrc.mpc_srcbus = MP_ISA_BUS;
1031 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1034 * Use the default configuration for the IRQs 0-15. Unless
1035 * overriden by (MADT) interrupt source override entries.
1037 for (i = 0; i < 16; i++) {
1040 for (idx = 0; idx < mp_irq_entries; idx++) {
1041 struct mpc_config_intsrc *irq = mp_irqs + idx;
1043 /* Do we already have a mapping for this ISA IRQ? */
1044 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1047 /* Do we already have a mapping for this IOAPIC pin */
1048 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1049 (irq->mpc_dstirq == i))
1053 if (idx != mp_irq_entries) {
1054 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1055 continue; /* IRQ already used */
1058 intsrc.mpc_irqtype = mp_INT;
1059 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1060 intsrc.mpc_dstirq = i;
1062 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1063 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1064 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1065 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1068 mp_irqs[mp_irq_entries] = intsrc;
1069 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1070 panic("Max # of irq sources exceeded!\n");
1074 #define MAX_GSI_NUM 4096
1076 int mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
1081 static int pci_irq = 16;
1083 * Mapping between Global System Interrups, which
1084 * represent all possible interrupts, and IRQs
1085 * assigned to actual devices.
1087 static int gsi_to_irq[MAX_GSI_NUM];
1089 #ifdef CONFIG_ACPI_BUS
1090 /* Don't set up the ACPI SCI because it's already set up */
1091 if (acpi_fadt.sci_int == gsi)
1095 ioapic = mp_find_ioapic(gsi);
1097 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1101 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1103 if (ioapic_renumber_irq)
1104 gsi = ioapic_renumber_irq(ioapic, gsi);
1107 * Avoid pin reprogramming. PRTs typically include entries
1108 * with redundant pin->gsi mappings (but unique PCI devices);
1109 * we only program the IOAPIC on the first.
1111 bit = ioapic_pin % 32;
1112 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1114 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1115 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1119 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1120 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1121 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1122 return gsi_to_irq[gsi];
1125 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1129 * For PCI devices assign IRQs in order, avoiding gaps
1130 * due to unused I/O APIC pins.
1133 if (gsi < MAX_GSI_NUM) {
1136 #ifdef CONFIG_ACPI_BUS
1138 * Don't assign IRQ used by ACPI SCI
1140 if (gsi == acpi_fadt.sci_int)
1143 gsi_to_irq[irq] = gsi;
1145 printk(KERN_ERR "GSI %u is too high\n", gsi);
1150 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1151 edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
1152 active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
1156 #endif /*CONFIG_X86_IO_APIC && (CONFIG_ACPI_INTERPRETER || CONFIG_ACPI_BOOT)*/
1157 #endif /*CONFIG_ACPI_BOOT*/