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 int mp_bus_id_to_type [MAX_MP_BUSSES];
46 int mp_bus_id_to_node [MAX_MP_BUSSES];
47 int mp_bus_id_to_local [MAX_MP_BUSSES];
48 int quad_local_to_mp_bus_id [NR_CPUS/4][4];
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 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
245 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
246 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
247 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
248 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
249 mpc_oem_pci_bus(m, translation_table[mpc_record]);
250 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
251 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
253 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
254 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
256 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
260 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
262 if (!(m->mpc_flags & MPC_APIC_USABLE))
265 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
266 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
267 if (nr_ioapics >= MAX_IO_APICS) {
268 printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
269 MAX_IO_APICS, nr_ioapics);
270 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
272 if (!m->mpc_apicaddr) {
273 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
274 " found in MP table, skipping!\n");
277 mp_ioapics[nr_ioapics] = *m;
281 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
283 mp_irqs [mp_irq_entries] = *m;
284 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
285 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
286 m->mpc_irqtype, m->mpc_irqflag & 3,
287 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
288 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
289 if (++mp_irq_entries == MAX_IRQ_SOURCES)
290 panic("Max # of irq sources exceeded!!\n");
293 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
295 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
296 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
297 m->mpc_irqtype, m->mpc_irqflag & 3,
298 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
299 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
302 #ifdef CONFIG_X86_NUMAQ
303 static void __init MP_translation_info (struct mpc_config_translation *m)
305 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);
307 if (mpc_record >= MAX_MPC_ENTRY)
308 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
310 translation_table[mpc_record] = m; /* stash this for later */
311 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
312 node_set_online(m->trans_quad);
316 * Read/parse the MPC oem tables
319 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
320 unsigned short oemsize)
322 int count = sizeof (*oemtable); /* the header size */
323 unsigned char *oemptr = ((unsigned char *)oemtable)+count;
326 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
327 if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
329 printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
330 oemtable->oem_signature[0],
331 oemtable->oem_signature[1],
332 oemtable->oem_signature[2],
333 oemtable->oem_signature[3]);
336 if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
338 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
341 while (count < oemtable->oem_length) {
345 struct mpc_config_translation *m=
346 (struct mpc_config_translation *)oemptr;
347 MP_translation_info(m);
348 oemptr += sizeof(*m);
355 printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
362 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
365 if (strncmp(oem, "IBM NUMA", 8))
366 printk("Warning! May not be a NUMA-Q system!\n");
368 smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
371 #endif /* CONFIG_X86_NUMAQ */
377 static int __init smp_read_mpc(struct mp_config_table *mpc)
381 int count=sizeof(*mpc);
382 unsigned char *mpt=((unsigned char *)mpc)+count;
384 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
385 printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
386 *(u32 *)mpc->mpc_signature);
389 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
390 printk(KERN_ERR "SMP mptable: checksum error!\n");
393 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
394 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
398 if (!mpc->mpc_lapic) {
399 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
402 memcpy(oem,mpc->mpc_oem,8);
404 printk(KERN_INFO "OEM ID: %s ",oem);
406 memcpy(str,mpc->mpc_productid,12);
408 printk("Product ID: %s ",str);
410 mps_oem_check(mpc, oem, str);
412 printk("APIC at: 0x%X\n", mpc->mpc_lapic);
415 * Save the local APIC address (it might be non-default) -- but only
416 * if we're not using ACPI.
419 mp_lapic_addr = mpc->mpc_lapic;
422 * Now process the configuration blocks.
425 while (count < mpc->mpc_length) {
429 struct mpc_config_processor *m=
430 (struct mpc_config_processor *)mpt;
431 /* ACPI may have already provided this data */
433 MP_processor_info(m);
440 struct mpc_config_bus *m=
441 (struct mpc_config_bus *)mpt;
449 struct mpc_config_ioapic *m=
450 (struct mpc_config_ioapic *)mpt;
458 struct mpc_config_intsrc *m=
459 (struct mpc_config_intsrc *)mpt;
468 struct mpc_config_lintsrc *m=
469 (struct mpc_config_lintsrc *)mpt;
477 count = mpc->mpc_length;
483 setup_apic_routing();
485 printk(KERN_ERR "SMP mptable: no processors registered!\n");
486 return num_processors;
489 static int __init ELCR_trigger(unsigned int irq)
493 port = 0x4d0 + (irq >> 3);
494 return (inb(port) >> (irq & 7)) & 1;
497 static void __init construct_default_ioirq_mptable(int mpc_default_type)
499 struct mpc_config_intsrc intsrc;
501 int ELCR_fallback = 0;
503 intsrc.mpc_type = MP_INTSRC;
504 intsrc.mpc_irqflag = 0; /* conforming */
505 intsrc.mpc_srcbus = 0;
506 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
508 intsrc.mpc_irqtype = mp_INT;
511 * If true, we have an ISA/PCI system with no IRQ entries
512 * in the MP table. To prevent the PCI interrupts from being set up
513 * incorrectly, we try to use the ELCR. The sanity check to see if
514 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
515 * never be level sensitive, so we simply see if the ELCR agrees.
516 * If it does, we assume it's valid.
518 if (mpc_default_type == 5) {
519 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
521 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
522 printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
524 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
529 for (i = 0; i < 16; i++) {
530 switch (mpc_default_type) {
532 if (i == 0 || i == 13)
533 continue; /* IRQ0 & IRQ13 not connected */
537 continue; /* IRQ2 is never connected */
542 * If the ELCR indicates a level-sensitive interrupt, we
543 * copy that information over to the MP table in the
544 * irqflag field (level sensitive, active high polarity).
547 intsrc.mpc_irqflag = 13;
549 intsrc.mpc_irqflag = 0;
552 intsrc.mpc_srcbusirq = i;
553 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
554 MP_intsrc_info(&intsrc);
557 intsrc.mpc_irqtype = mp_ExtINT;
558 intsrc.mpc_srcbusirq = 0;
559 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
560 MP_intsrc_info(&intsrc);
563 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
565 struct mpc_config_processor processor;
566 struct mpc_config_bus bus;
567 struct mpc_config_ioapic ioapic;
568 struct mpc_config_lintsrc lintsrc;
569 int linttypes[2] = { mp_ExtINT, mp_NMI };
573 * local APIC has default address
575 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
578 * 2 CPUs, numbered 0 & 1.
580 processor.mpc_type = MP_PROCESSOR;
581 /* Either an integrated APIC or a discrete 82489DX. */
582 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
583 processor.mpc_cpuflag = CPU_ENABLED;
584 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
585 (boot_cpu_data.x86_model << 4) |
586 boot_cpu_data.x86_mask;
587 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
588 processor.mpc_reserved[0] = 0;
589 processor.mpc_reserved[1] = 0;
590 for (i = 0; i < 2; i++) {
591 processor.mpc_apicid = i;
592 MP_processor_info(&processor);
595 bus.mpc_type = MP_BUS;
597 switch (mpc_default_type) {
600 printk(KERN_ERR "Unknown standard configuration %d\n",
605 memcpy(bus.mpc_bustype, "ISA ", 6);
610 memcpy(bus.mpc_bustype, "EISA ", 6);
614 memcpy(bus.mpc_bustype, "MCA ", 6);
617 if (mpc_default_type > 4) {
619 memcpy(bus.mpc_bustype, "PCI ", 6);
623 ioapic.mpc_type = MP_IOAPIC;
624 ioapic.mpc_apicid = 2;
625 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
626 ioapic.mpc_flags = MPC_APIC_USABLE;
627 ioapic.mpc_apicaddr = 0xFEC00000;
628 MP_ioapic_info(&ioapic);
631 * We set up most of the low 16 IO-APIC pins according to MPS rules.
633 construct_default_ioirq_mptable(mpc_default_type);
635 lintsrc.mpc_type = MP_LINTSRC;
636 lintsrc.mpc_irqflag = 0; /* conforming */
637 lintsrc.mpc_srcbusid = 0;
638 lintsrc.mpc_srcbusirq = 0;
639 lintsrc.mpc_destapic = MP_APIC_ALL;
640 for (i = 0; i < 2; i++) {
641 lintsrc.mpc_irqtype = linttypes[i];
642 lintsrc.mpc_destapiclint = i;
643 MP_lintsrc_info(&lintsrc);
647 static struct intel_mp_floating *mpf_found;
650 * Scan the memory blocks for an SMP configuration block.
652 void __init get_smp_config (void)
654 struct intel_mp_floating *mpf = mpf_found;
657 * ACPI supports both logical (e.g. Hyper-Threading) and physical
658 * processors, where MPS only supports physical.
660 if (acpi_lapic && acpi_ioapic) {
661 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
665 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
667 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
668 if (mpf->mpf_feature2 & (1<<7)) {
669 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
672 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
677 * Now see if we need to read further.
679 if (mpf->mpf_feature1 != 0) {
681 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
682 construct_default_ISA_mptable(mpf->mpf_feature1);
684 } else if (mpf->mpf_physptr) {
687 * Read the physical hardware table. Anything here will
688 * override the defaults.
690 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
691 smp_found_config = 0;
692 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
693 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
697 * If there are no explicit MP IRQ entries, then we are
698 * broken. We set up most of the low 16 IO-APIC pins to
699 * ISA defaults and hope it will work.
701 if (!mp_irq_entries) {
702 struct mpc_config_bus bus;
704 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
706 bus.mpc_type = MP_BUS;
708 memcpy(bus.mpc_bustype, "ISA ", 6);
711 construct_default_ioirq_mptable(0);
717 printk(KERN_INFO "Processors: %d\n", num_processors);
719 * Only use the first configuration found.
723 static int __init smp_scan_config (unsigned long base, unsigned long length)
725 unsigned long *bp = phys_to_virt(base);
726 struct intel_mp_floating *mpf;
728 printk(KERN_INFO "Scan SMP from %p for %ld bytes.\n", bp,length);
729 if (sizeof(*mpf) != 16)
730 printk("Error: MPF size\n");
733 mpf = (struct intel_mp_floating *)bp;
734 if ((*bp == SMP_MAGIC_IDENT) &&
735 (mpf->mpf_length == 1) &&
736 !mpf_checksum((unsigned char *)bp, 16) &&
737 ((mpf->mpf_specification == 1)
738 || (mpf->mpf_specification == 4)) ) {
740 smp_found_config = 1;
741 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
742 mpf, virt_to_phys(mpf));
743 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
745 if (mpf->mpf_physptr) {
747 * We cannot access to MPC table to compute
748 * table size yet, as only few megabytes from
749 * the bottom is mapped now.
750 * PC-9800's MPC table places on the very last
751 * of physical memory; so that simply reserving
752 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
753 * in reserve_bootmem.
755 unsigned long size = PAGE_SIZE;
756 unsigned long end = max_low_pfn * PAGE_SIZE;
757 if (mpf->mpf_physptr + size > end)
758 size = end - mpf->mpf_physptr;
759 reserve_bootmem(mpf->mpf_physptr, size,
772 void __init find_smp_config (void)
774 unsigned int address;
777 * FIXME: Linux assumes you have 640K of base ram..
778 * this continues the error...
780 * 1) Scan the bottom 1K for a signature
781 * 2) Scan the top 1K of base RAM
782 * 3) Scan the 64K of bios
784 if (smp_scan_config(0x0,0x400) ||
785 smp_scan_config(639*0x400,0x400) ||
786 smp_scan_config(0xF0000,0x10000))
789 * If it is an SMP machine we should know now, unless the
790 * configuration is in an EISA/MCA bus machine with an
791 * extended bios data area.
793 * there is a real-mode segmented pointer pointing to the
794 * 4K EBDA area at 0x40E, calculate and scan it here.
796 * NOTE! There are Linux loaders that will corrupt the EBDA
797 * area, and as such this kind of SMP config may be less
798 * trustworthy, simply because the SMP table may have been
799 * stomped on during early boot. These loaders are buggy and
802 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
805 address = get_bios_ebda();
807 smp_scan_config(address, 0x400);
812 /* --------------------------------------------------------------------------
813 ACPI-based MP Configuration
814 -------------------------------------------------------------------------- */
818 void __init mp_register_lapic_address(u64 address)
820 mp_lapic_addr = (unsigned long) address;
822 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
824 if (boot_cpu_physical_apicid == -1U)
825 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
827 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
830 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
832 struct mpc_config_processor processor;
835 if (MAX_APICS - id <= 0) {
836 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
841 if (id == boot_cpu_physical_apicid)
844 processor.mpc_type = MP_PROCESSOR;
845 processor.mpc_apicid = id;
846 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
847 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
848 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
849 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
850 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
851 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
852 processor.mpc_reserved[0] = 0;
853 processor.mpc_reserved[1] = 0;
855 MP_processor_info(&processor);
858 #ifdef CONFIG_X86_IO_APIC
861 #define MP_MAX_IOAPIC_PIN 127
863 static struct mp_ioapic_routing {
867 u32 pin_programmed[4];
868 } mp_ioapic_routing[MAX_IO_APICS];
870 static int mp_find_ioapic (int gsi)
874 /* Find the IOAPIC that manages this GSI. */
875 for (i = 0; i < nr_ioapics; i++) {
876 if ((gsi >= mp_ioapic_routing[i].gsi_base)
877 && (gsi <= mp_ioapic_routing[i].gsi_end))
881 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
886 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
891 if (nr_ioapics >= MAX_IO_APICS) {
892 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
893 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
894 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
897 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
898 " found in MADT table, skipping!\n");
904 mp_ioapics[idx].mpc_type = MP_IOAPIC;
905 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
906 mp_ioapics[idx].mpc_apicaddr = address;
908 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
909 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
910 && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
911 tmpid = io_apic_get_unique_id(idx, id);
918 mp_ioapics[idx].mpc_apicid = tmpid;
919 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
922 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
923 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
925 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
926 mp_ioapic_routing[idx].gsi_base = gsi_base;
927 mp_ioapic_routing[idx].gsi_end = gsi_base +
928 io_apic_get_redir_entries(idx);
930 printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
931 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
932 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
933 mp_ioapic_routing[idx].gsi_base,
934 mp_ioapic_routing[idx].gsi_end);
938 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
940 struct mpc_config_intsrc intsrc;
945 * Convert 'gsi' to 'ioapic.pin'.
947 ioapic = mp_find_ioapic(gsi);
950 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
953 * TBD: This check is for faulty timer entries, where the override
954 * erroneously sets the trigger to level, resulting in a HUGE
955 * increase of timer interrupts!
957 if ((bus_irq == 0) && (trigger == 3))
960 intsrc.mpc_type = MP_INTSRC;
961 intsrc.mpc_irqtype = mp_INT;
962 intsrc.mpc_irqflag = (trigger << 2) | polarity;
963 intsrc.mpc_srcbus = MP_ISA_BUS;
964 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
965 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
966 intsrc.mpc_dstirq = pin; /* INTIN# */
968 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
969 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
970 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
971 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
973 mp_irqs[mp_irq_entries] = intsrc;
974 if (++mp_irq_entries == MAX_IRQ_SOURCES)
975 panic("Max # of irq sources exceeded!\n");
978 void __init mp_config_acpi_legacy_irqs (void)
980 struct mpc_config_intsrc intsrc;
985 * Fabricate the legacy ISA bus (bus #31).
987 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
988 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
991 * Older generations of ES7000 have no legacy identity mappings
993 if (es7000_plat == 1)
997 * Locate the IOAPIC that manages the ISA IRQs (0-15).
999 ioapic = mp_find_ioapic(0);
1003 intsrc.mpc_type = MP_INTSRC;
1004 intsrc.mpc_irqflag = 0; /* Conforming */
1005 intsrc.mpc_srcbus = MP_ISA_BUS;
1006 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
1009 * Use the default configuration for the IRQs 0-15. Unless
1010 * overridden by (MADT) interrupt source override entries.
1012 for (i = 0; i < 16; i++) {
1015 for (idx = 0; idx < mp_irq_entries; idx++) {
1016 struct mpc_config_intsrc *irq = mp_irqs + idx;
1018 /* Do we already have a mapping for this ISA IRQ? */
1019 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
1022 /* Do we already have a mapping for this IOAPIC pin */
1023 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
1024 (irq->mpc_dstirq == i))
1028 if (idx != mp_irq_entries) {
1029 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1030 continue; /* IRQ already used */
1033 intsrc.mpc_irqtype = mp_INT;
1034 intsrc.mpc_srcbusirq = i; /* Identity mapped */
1035 intsrc.mpc_dstirq = i;
1037 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
1038 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
1039 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
1040 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
1043 mp_irqs[mp_irq_entries] = intsrc;
1044 if (++mp_irq_entries == MAX_IRQ_SOURCES)
1045 panic("Max # of irq sources exceeded!\n");
1049 #define MAX_GSI_NUM 4096
1050 #define IRQ_COMPRESSION_START 64
1052 int mp_register_gsi(u32 gsi, int triggering, int polarity)
1057 static int pci_irq = IRQ_COMPRESSION_START;
1059 * Mapping between Global System Interrupts, which
1060 * represent all possible interrupts, and IRQs
1061 * assigned to actual devices.
1063 static int gsi_to_irq[MAX_GSI_NUM];
1065 /* Don't set up the ACPI SCI because it's already set up */
1066 if (acpi_gbl_FADT.sci_interrupt == gsi)
1069 ioapic = mp_find_ioapic(gsi);
1071 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1075 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1077 if (ioapic_renumber_irq)
1078 gsi = ioapic_renumber_irq(ioapic, gsi);
1081 * Avoid pin reprogramming. PRTs typically include entries
1082 * with redundant pin->gsi mappings (but unique PCI devices);
1083 * we only program the IOAPIC on the first.
1085 bit = ioapic_pin % 32;
1086 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
1088 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1089 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1093 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
1094 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1095 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1096 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1099 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
1102 * For GSI >= 64, use IRQ compression
1104 if ((gsi >= IRQ_COMPRESSION_START)
1105 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1107 * For PCI devices assign IRQs in order, avoiding gaps
1108 * due to unused I/O APIC pins.
1111 if (gsi < MAX_GSI_NUM) {
1113 * Retain the VIA chipset work-around (gsi > 15), but
1114 * avoid a problem where the 8254 timer (IRQ0) is setup
1115 * via an override (so it's not on pin 0 of the ioapic),
1116 * and at the same time, the pin 0 interrupt is a PCI
1117 * type. The gsi > 15 test could cause these two pins
1118 * to be shared as IRQ0, and they are not shareable.
1119 * So test for this condition, and if necessary, avoid
1120 * the pin collision.
1122 if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
1125 * Don't assign IRQ used by ACPI SCI
1127 if (gsi == acpi_gbl_FADT.sci_interrupt)
1129 gsi_to_irq[irq] = gsi;
1131 printk(KERN_ERR "GSI %u is too high\n", gsi);
1136 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1137 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1138 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1142 #endif /* CONFIG_X86_IO_APIC */
1143 #endif /* CONFIG_ACPI */