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/bootmem.h>
21 #include <linux/kernel_stat.h>
22 #include <linux/mc146818rtc.h>
23 #include <linux/bitops.h>
28 #include <asm/mpspec.h>
29 #include <asm/io_apic.h>
31 #include <mach_apic.h>
32 #include <mach_apicdef.h>
33 #include <mach_mpparse.h>
34 #include <bios_ebda.h>
36 /* Have we found an MP table */
38 unsigned int __cpuinitdata maxcpus = NR_CPUS;
41 * Various Linux-internal data structures created from the
44 int apic_version [MAX_APICS];
45 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
46 int mp_bus_id_to_type [MAX_MP_BUSSES];
48 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
49 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
50 static int mp_current_pci_id;
52 /* I/O APIC entries */
53 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
55 /* # of MP IRQ source entries */
56 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
58 /* MP IRQ source entries */
64 unsigned long mp_lapic_addr;
66 unsigned int def_to_bigsmp = 0;
68 /* Processor that is doing the boot up */
69 unsigned int boot_cpu_physical_apicid = -1U;
70 /* Internal processor count */
71 unsigned int num_processors;
73 unsigned disabled_cpus __cpuinitdata;
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] __cpuinitdata;
108 static void __cpuinit MP_processor_info (struct mpc_config_processor *m)
111 physid_mask_t phys_cpu;
113 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
118 apicid = mpc_apic_id(m, translation_table[mpc_record]);
120 if (m->mpc_featureflag&(1<<0))
121 Dprintk(" Floating point unit present.\n");
122 if (m->mpc_featureflag&(1<<7))
123 Dprintk(" Machine Exception supported.\n");
124 if (m->mpc_featureflag&(1<<8))
125 Dprintk(" 64 bit compare & exchange supported.\n");
126 if (m->mpc_featureflag&(1<<9))
127 Dprintk(" Internal APIC present.\n");
128 if (m->mpc_featureflag&(1<<11))
129 Dprintk(" SEP present.\n");
130 if (m->mpc_featureflag&(1<<12))
131 Dprintk(" MTRR present.\n");
132 if (m->mpc_featureflag&(1<<13))
133 Dprintk(" PGE present.\n");
134 if (m->mpc_featureflag&(1<<14))
135 Dprintk(" MCA present.\n");
136 if (m->mpc_featureflag&(1<<15))
137 Dprintk(" CMOV present.\n");
138 if (m->mpc_featureflag&(1<<16))
139 Dprintk(" PAT present.\n");
140 if (m->mpc_featureflag&(1<<17))
141 Dprintk(" PSE present.\n");
142 if (m->mpc_featureflag&(1<<18))
143 Dprintk(" PSN present.\n");
144 if (m->mpc_featureflag&(1<<19))
145 Dprintk(" Cache Line Flush Instruction present.\n");
147 if (m->mpc_featureflag&(1<<21))
148 Dprintk(" Debug Trace and EMON Store present.\n");
149 if (m->mpc_featureflag&(1<<22))
150 Dprintk(" ACPI Thermal Throttle Registers present.\n");
151 if (m->mpc_featureflag&(1<<23))
152 Dprintk(" MMX present.\n");
153 if (m->mpc_featureflag&(1<<24))
154 Dprintk(" FXSR present.\n");
155 if (m->mpc_featureflag&(1<<25))
156 Dprintk(" XMM present.\n");
157 if (m->mpc_featureflag&(1<<26))
158 Dprintk(" Willamette New Instructions present.\n");
159 if (m->mpc_featureflag&(1<<27))
160 Dprintk(" Self Snoop present.\n");
161 if (m->mpc_featureflag&(1<<28))
162 Dprintk(" HT present.\n");
163 if (m->mpc_featureflag&(1<<29))
164 Dprintk(" Thermal Monitor present.\n");
165 /* 30, 31 Reserved */
168 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
169 Dprintk(" Bootup CPU\n");
170 boot_cpu_physical_apicid = m->mpc_apicid;
173 ver = m->mpc_apicver;
179 printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
180 "fixing up to 0x10. (tell your hw vendor)\n",
184 apic_version[m->mpc_apicid] = ver;
186 phys_cpu = apicid_to_cpu_present(apicid);
187 physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
189 if (num_processors >= NR_CPUS) {
190 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
191 " Processor ignored.\n", NR_CPUS);
195 if (num_processors >= maxcpus) {
196 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
197 " Processor ignored.\n", maxcpus);
201 cpu_set(num_processors, cpu_possible_map);
205 * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
206 * but we need to work other dependencies like SMP_SUSPEND etc
207 * before this can be done without some confusion.
208 * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
209 * - Ashok Raj <ashok.raj@intel.com>
211 if (num_processors > 8) {
212 switch (boot_cpu_data.x86_vendor) {
213 case X86_VENDOR_INTEL:
214 if (!APIC_XAPIC(ver)) {
218 /* If P4 and above fall through */
223 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
226 static void __init MP_bus_info (struct mpc_config_bus *m)
230 memcpy(str, m->mpc_bustype, 6);
233 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
235 #if MAX_MP_BUSSES < 256
236 if (m->mpc_busid >= MAX_MP_BUSSES) {
237 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
238 " is too large, max. supported is %d\n",
239 m->mpc_busid, str, MAX_MP_BUSSES - 1);
244 set_bit(m->mpc_busid, mp_bus_not_pci);
245 if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
246 mpc_oem_pci_bus(m, translation_table[mpc_record]);
247 clear_bit(m->mpc_busid, mp_bus_not_pci);
248 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
250 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
251 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
252 } else 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_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
257 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
259 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
264 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
266 if (!(m->mpc_flags & MPC_APIC_USABLE))
269 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
270 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
271 if (nr_ioapics >= MAX_IO_APICS) {
272 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
273 MAX_IO_APICS, nr_ioapics);
274 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
276 if (!m->mpc_apicaddr) {
277 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
278 " found in MP table, skipping!\n");
281 mp_ioapics[nr_ioapics] = *m;
285 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
287 mp_irqs [mp_irq_entries] = *m;
288 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
289 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
290 m->mpc_irqtype, m->mpc_irqflag & 3,
291 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
292 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
293 if (++mp_irq_entries == MAX_IRQ_SOURCES)
294 panic("Max # of irq sources exceeded!!\n");
297 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
299 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
300 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
301 m->mpc_irqtype, m->mpc_irqflag & 3,
302 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
303 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
306 #ifdef CONFIG_X86_NUMAQ
307 static void __init MP_translation_info (struct mpc_config_translation *m)
309 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);
311 if (mpc_record >= MAX_MPC_ENTRY)
312 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
314 translation_table[mpc_record] = m; /* stash this for later */
315 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
316 node_set_online(m->trans_quad);
320 * Read/parse the MPC oem tables
323 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
324 unsigned short oemsize)
326 int count = sizeof (*oemtable); /* the header size */
327 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
330 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
331 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
333 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
334 oemtable->oem_signature[0],
335 oemtable->oem_signature[1],
336 oemtable->oem_signature[2],
337 oemtable->oem_signature[3]);
340 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
342 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
345 while (count < oemtable->oem_length) {
349 struct mpc_config_translation *m=
350 (struct mpc_config_translation *)oemptr;
351 MP_translation_info(m);
352 oemptr += sizeof(*m);
359 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
366 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
369 if (strncmp(oem, "IBM NUMA", 8))
370 printk("Warning! May not be a NUMA-Q system!\n");
372 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
375 #endif /* CONFIG_X86_NUMAQ */
381 static int __init smp_read_mpc(struct mp_config_table *mpc)
385 int count=sizeof(*mpc);
386 unsigned char *mpt=((unsigned char *)mpc)+count;
388 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
389 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
390 *(u32 *)mpc->mpc_signature);
393 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
394 printk(KERN_ERR "SMP mptable: checksum error!\n");
397 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
398 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
402 if (!mpc->mpc_lapic) {
403 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
406 memcpy(oem,mpc->mpc_oem,8);
408 printk(KERN_INFO "OEM ID: %s ",oem);
410 memcpy(str,mpc->mpc_productid,12);
412 printk("Product ID: %s ",str);
414 mps_oem_check(mpc, oem, str);
416 printk("APIC at: 0x%X\n", mpc->mpc_lapic);
419 * Save the local APIC address (it might be non-default) -- but only
420 * if we're not using ACPI.
423 mp_lapic_addr = mpc->mpc_lapic;
426 * Now process the configuration blocks.
429 while (count < mpc->mpc_length) {
433 struct mpc_config_processor *m=
434 (struct mpc_config_processor *)mpt;
435 /* ACPI may have already provided this data */
437 MP_processor_info(m);
444 struct mpc_config_bus *m=
445 (struct mpc_config_bus *)mpt;
453 struct mpc_config_ioapic *m=
454 (struct mpc_config_ioapic *)mpt;
462 struct mpc_config_intsrc *m=
463 (struct mpc_config_intsrc *)mpt;
472 struct mpc_config_lintsrc *m=
473 (struct mpc_config_lintsrc *)mpt;
481 count = mpc->mpc_length;
487 setup_apic_routing();
489 printk(KERN_ERR "SMP mptable: no processors registered!\n");
490 return num_processors;
493 static int __init ELCR_trigger(unsigned int irq)
497 port = 0x4d0 + (irq >> 3);
498 return (inb(port) >> (irq & 7)) & 1;
501 static void __init construct_default_ioirq_mptable(int mpc_default_type)
503 struct mpc_config_intsrc intsrc;
505 int ELCR_fallback = 0;
507 intsrc.mpc_type = MP_INTSRC;
508 intsrc.mpc_irqflag = 0; /* conforming */
509 intsrc.mpc_srcbus = 0;
510 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
512 intsrc.mpc_irqtype = mp_INT;
515 * If true, we have an ISA/PCI system with no IRQ entries
516 * in the MP table. To prevent the PCI interrupts from being set up
517 * incorrectly, we try to use the ELCR. The sanity check to see if
518 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
519 * never be level sensitive, so we simply see if the ELCR agrees.
520 * If it does, we assume it's valid.
522 if (mpc_default_type == 5) {
523 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
525 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
526 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
528 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
533 for (i = 0; i < 16; i++) {
534 switch (mpc_default_type) {
536 if (i == 0 || i == 13)
537 continue; /* IRQ0 & IRQ13 not connected */
541 continue; /* IRQ2 is never connected */
546 * If the ELCR indicates a level-sensitive interrupt, we
547 * copy that information over to the MP table in the
548 * irqflag field (level sensitive, active high polarity).
551 intsrc.mpc_irqflag = 13;
553 intsrc.mpc_irqflag = 0;
556 intsrc.mpc_srcbusirq = i;
557 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
558 MP_intsrc_info(&intsrc);
561 intsrc.mpc_irqtype = mp_ExtINT;
562 intsrc.mpc_srcbusirq = 0;
563 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
564 MP_intsrc_info(&intsrc);
567 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
569 struct mpc_config_processor processor;
570 struct mpc_config_bus bus;
571 struct mpc_config_ioapic ioapic;
572 struct mpc_config_lintsrc lintsrc;
573 int linttypes[2] = { mp_ExtINT, mp_NMI };
577 * local APIC has default address
579 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
582 * 2 CPUs, numbered 0 & 1.
584 processor.mpc_type = MP_PROCESSOR;
585 /* Either an integrated APIC or a discrete 82489DX. */
586 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
587 processor.mpc_cpuflag = CPU_ENABLED;
588 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
589 (boot_cpu_data.x86_model << 4) |
590 boot_cpu_data.x86_mask;
591 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
592 processor.mpc_reserved[0] = 0;
593 processor.mpc_reserved[1] = 0;
594 for (i = 0; i < 2; i++) {
595 processor.mpc_apicid = i;
596 MP_processor_info(&processor);
599 bus.mpc_type = MP_BUS;
601 switch (mpc_default_type) {
604 printk(KERN_ERR "Unknown standard configuration %d\n",
609 memcpy(bus.mpc_bustype, "ISA ", 6);
614 memcpy(bus.mpc_bustype, "EISA ", 6);
618 memcpy(bus.mpc_bustype, "MCA ", 6);
621 if (mpc_default_type > 4) {
623 memcpy(bus.mpc_bustype, "PCI ", 6);
627 ioapic.mpc_type = MP_IOAPIC;
628 ioapic.mpc_apicid = 2;
629 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
630 ioapic.mpc_flags = MPC_APIC_USABLE;
631 ioapic.mpc_apicaddr = 0xFEC00000;
632 MP_ioapic_info(&ioapic);
635 * We set up most of the low 16 IO-APIC pins according to MPS rules.
637 construct_default_ioirq_mptable(mpc_default_type);
639 lintsrc.mpc_type = MP_LINTSRC;
640 lintsrc.mpc_irqflag = 0; /* conforming */
641 lintsrc.mpc_srcbusid = 0;
642 lintsrc.mpc_srcbusirq = 0;
643 lintsrc.mpc_destapic = MP_APIC_ALL;
644 for (i = 0; i < 2; i++) {
645 lintsrc.mpc_irqtype = linttypes[i];
646 lintsrc.mpc_destapiclint = i;
647 MP_lintsrc_info(&lintsrc);
651 static struct intel_mp_floating *mpf_found;
654 * Scan the memory blocks for an SMP configuration block.
656 void __init get_smp_config (void)
658 struct intel_mp_floating *mpf = mpf_found;
661 * ACPI supports both logical (e.g. Hyper-Threading) and physical
662 * processors, where MPS only supports physical.
664 if (acpi_lapic && acpi_ioapic) {
665 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
669 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
671 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
672 if (mpf->mpf_feature2 & (1<<7)) {
673 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
676 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
681 * Now see if we need to read further.
683 if (mpf->mpf_feature1 != 0) {
685 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
686 construct_default_ISA_mptable(mpf->mpf_feature1);
688 } else if (mpf->mpf_physptr) {
691 * Read the physical hardware table. Anything here will
692 * override the defaults.
694 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
695 smp_found_config = 0;
696 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
697 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
701 * If there are no explicit MP IRQ entries, then we are
702 * broken. We set up most of the low 16 IO-APIC pins to
703 * ISA defaults and hope it will work.
705 if (!mp_irq_entries) {
706 struct mpc_config_bus bus;
708 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
710 bus.mpc_type = MP_BUS;
712 memcpy(bus.mpc_bustype, "ISA ", 6);
715 construct_default_ioirq_mptable(0);
721 printk(KERN_INFO "Processors: %d\n", num_processors);
723 * Only use the first configuration found.
727 static int __init smp_scan_config (unsigned long base, unsigned long length)
729 unsigned long *bp = phys_to_virt(base);
730 struct intel_mp_floating *mpf;
732 printk(KERN_INFO "Scan SMP from %p for %ld bytes.\n", bp,length);
733 if (sizeof(*mpf) != 16)
734 printk("Error: MPF size\n");
737 mpf = (struct intel_mp_floating *)bp;
738 if ((*bp == SMP_MAGIC_IDENT) &&
739 (mpf->mpf_length == 1) &&
740 !mpf_checksum((unsigned char *)bp, 16) &&
741 ((mpf->mpf_specification == 1)
742 || (mpf->mpf_specification == 4)) ) {
744 smp_found_config = 1;
745 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
746 mpf, virt_to_phys(mpf));
747 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
749 if (mpf->mpf_physptr) {
751 * We cannot access to MPC table to compute
752 * table size yet, as only few megabytes from
753 * the bottom is mapped now.
754 * PC-9800's MPC table places on the very last
755 * of physical memory; so that simply reserving
756 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
757 * in reserve_bootmem.
759 unsigned long size = PAGE_SIZE;
760 unsigned long end = max_low_pfn * PAGE_SIZE;
761 if (mpf->mpf_physptr + size > end)
762 size = end - mpf->mpf_physptr;
763 reserve_bootmem(mpf->mpf_physptr, size,
776 void __init find_smp_config (void)
778 unsigned int address;
781 * FIXME: Linux assumes you have 640K of base ram..
782 * this continues the error...
784 * 1) Scan the bottom 1K for a signature
785 * 2) Scan the top 1K of base RAM
786 * 3) Scan the 64K of bios
788 if (smp_scan_config(0x0,0x400) ||
789 smp_scan_config(639*0x400,0x400) ||
790 smp_scan_config(0xF0000,0x10000))
793 * If it is an SMP machine we should know now, unless the
794 * configuration is in an EISA/MCA bus machine with an
795 * extended bios data area.
797 * there is a real-mode segmented pointer pointing to the
798 * 4K EBDA area at 0x40E, calculate and scan it here.
800 * NOTE! There are Linux loaders that will corrupt the EBDA
801 * area, and as such this kind of SMP config may be less
802 * trustworthy, simply because the SMP table may have been
803 * stomped on during early boot. These loaders are buggy and
806 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
809 address = get_bios_ebda();
811 smp_scan_config(address, 0x400);
816 /* --------------------------------------------------------------------------
817 ACPI-based MP Configuration
818 -------------------------------------------------------------------------- */
822 void __init mp_register_lapic_address(u64 address)
824 mp_lapic_addr = (unsigned long) address;
826 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
828 if (boot_cpu_physical_apicid == -1U)
829 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
831 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
834 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
836 struct mpc_config_processor processor;
839 if (MAX_APICS - id <= 0) {
840 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
845 if (id == boot_cpu_physical_apicid)
848 processor.mpc_type = MP_PROCESSOR;
849 processor.mpc_apicid = id;
850 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
851 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
852 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
853 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
854 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
855 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
856 processor.mpc_reserved[0] = 0;
857 processor.mpc_reserved[1] = 0;
859 MP_processor_info(&processor);
862 #ifdef CONFIG_X86_IO_APIC
865 #define MP_MAX_IOAPIC_PIN 127
867 static struct mp_ioapic_routing {
871 u32 pin_programmed[4];
872 } mp_ioapic_routing[MAX_IO_APICS];
874 static int mp_find_ioapic (int gsi)
878 /* Find the IOAPIC that manages this GSI. */
879 for (i = 0; i < nr_ioapics; i++) {
880 if ((gsi >= mp_ioapic_routing[i].gsi_base)
881 && (gsi <= mp_ioapic_routing[i].gsi_end))
885 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
890 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
895 if (nr_ioapics >= MAX_IO_APICS) {
896 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
897 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
898 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
901 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
902 " found in MADT table, skipping!\n");
908 mp_ioapics[idx].mpc_type = MP_IOAPIC;
909 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
910 mp_ioapics[idx].mpc_apicaddr = address;
912 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
913 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
914 && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
915 tmpid = io_apic_get_unique_id(idx, id);
922 mp_ioapics[idx].mpc_apicid = tmpid;
923 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
926 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
927 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
929 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
930 mp_ioapic_routing[idx].gsi_base = gsi_base;
931 mp_ioapic_routing[idx].gsi_end = gsi_base +
932 io_apic_get_redir_entries(idx);
934 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
935 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
936 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
937 mp_ioapic_routing[idx].gsi_base,
938 mp_ioapic_routing[idx].gsi_end);
942 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
944 struct mpc_config_intsrc intsrc;
949 * Convert 'gsi' to 'ioapic.pin'.
951 ioapic = mp_find_ioapic(gsi);
954 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
957 * TBD: This check is for faulty timer entries, where the override
958 * erroneously sets the trigger to level, resulting in a HUGE
959 * increase of timer interrupts!
961 if ((bus_irq == 0) && (trigger == 3))
964 intsrc.mpc_type = MP_INTSRC;
965 intsrc.mpc_irqtype = mp_INT;
966 intsrc.mpc_irqflag = (trigger << 2) | polarity;
967 intsrc.mpc_srcbus = MP_ISA_BUS;
968 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
969 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
970 intsrc.mpc_dstirq = pin; /* INTIN# */
972 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
973 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
974 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
975 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
977 mp_irqs[mp_irq_entries] = intsrc;
978 if (++mp_irq_entries == MAX_IRQ_SOURCES)
979 panic("Max # of irq sources exceeded!\n");
982 void __init mp_config_acpi_legacy_irqs (void)
984 struct mpc_config_intsrc intsrc;
988 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
990 * Fabricate the legacy ISA bus (bus #31).
992 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
994 set_bit(MP_ISA_BUS, mp_bus_not_pci);
995 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
998 * Older generations of ES7000 have no legacy identity mappings
1000 if (es7000_plat == 1)
1004 * Locate the IOAPIC that manages the ISA IRQs (0-15).
1006 ioapic = mp_find_ioapic(0);
1010 intsrc.mpc_type = MP_INTSRC;
1011 intsrc.mpc_irqflag = 0; /* Conforming */
1012 intsrc.mpc_srcbus = MP_ISA_BUS;
1013 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1016 * Use the default configuration for the IRQs 0-15. Unless
1017 * overridden by (MADT) interrupt source override entries.
1019 for (i = 0; i < 16; i++) {
1022 for (idx = 0; idx < mp_irq_entries; idx++) {
1023 struct mpc_config_intsrc *irq = mp_irqs + idx;
1025 /* Do we already have a mapping for this ISA IRQ? */
1026 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1029 /* Do we already have a mapping for this IOAPIC pin */
1030 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1031 (irq->mpc_dstirq == i))
1035 if (idx != mp_irq_entries) {
1036 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1037 continue; /* IRQ already used */
1040 intsrc.mpc_irqtype = mp_INT;
1041 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1042 intsrc.mpc_dstirq = i;
1044 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1045 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1046 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1047 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1050 mp_irqs[mp_irq_entries] = intsrc;
1051 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1052 panic("Max # of irq sources exceeded!\n");
1056 #define MAX_GSI_NUM 4096
1057 #define IRQ_COMPRESSION_START 64
1059 int mp_register_gsi(u32 gsi, int triggering, int polarity)
1064 static int pci_irq = IRQ_COMPRESSION_START;
1066 * Mapping between Global System Interrupts, which
1067 * represent all possible interrupts, and IRQs
1068 * assigned to actual devices.
1070 static int gsi_to_irq[MAX_GSI_NUM];
1072 /* Don't set up the ACPI SCI because it's already set up */
1073 if (acpi_gbl_FADT.sci_interrupt == gsi)
1076 ioapic = mp_find_ioapic(gsi);
1078 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1082 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1084 if (ioapic_renumber_irq)
1085 gsi = ioapic_renumber_irq(ioapic, gsi);
1088 * Avoid pin reprogramming. PRTs typically include entries
1089 * with redundant pin->gsi mappings (but unique PCI devices);
1090 * we only program the IOAPIC on the first.
1092 bit = ioapic_pin % 32;
1093 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1095 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1096 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1100 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1101 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1102 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1103 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1106 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1109 * For GSI >= 64, use IRQ compression
1111 if ((gsi >= IRQ_COMPRESSION_START)
1112 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1114 * For PCI devices assign IRQs in order, avoiding gaps
1115 * due to unused I/O APIC pins.
1118 if (gsi < MAX_GSI_NUM) {
1120 * Retain the VIA chipset work-around (gsi > 15), but
1121 * avoid a problem where the 8254 timer (IRQ0) is setup
1122 * via an override (so it's not on pin 0 of the ioapic),
1123 * and at the same time, the pin 0 interrupt is a PCI
1124 * type. The gsi > 15 test could cause these two pins
1125 * to be shared as IRQ0, and they are not shareable.
1126 * So test for this condition, and if necessary, avoid
1127 * the pin collision.
1129 if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
1132 * Don't assign IRQ used by ACPI SCI
1134 if (gsi == acpi_gbl_FADT.sci_interrupt)
1136 gsi_to_irq[irq] = gsi;
1138 printk(KERN_ERR "GSI %u is too high\n", gsi);
1143 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1144 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1145 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1149 #endif /* CONFIG_X86_IO_APIC */
1150 #endif /* CONFIG_ACPI */