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/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/acpi.h>
26 #include <linux/module.h>
30 #include <asm/mpspec.h>
31 #include <asm/pgalloc.h>
32 #include <asm/io_apic.h>
33 #include <asm/proto.h>
36 /* Have we found an MP table */
38 unsigned int __initdata maxcpus = NR_CPUS;
43 * Various Linux-internal data structures created from the
46 int apic_version [MAX_APICS];
47 unsigned char mp_bus_id_to_type [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
48 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
50 static int mp_current_pci_id = 0;
51 /* I/O APIC entries */
52 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
54 /* # of MP IRQ source entries */
55 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
57 /* MP IRQ source entries */
62 unsigned long mp_lapic_addr = 0;
66 /* Processor that is doing the boot up */
67 unsigned int boot_cpu_id = -1U;
68 /* Internal processor count */
69 static unsigned int num_processors = 0;
71 /* Bitmask of physically existing CPUs */
72 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
74 /* ACPI MADT entry parsing functions */
76 extern struct acpi_boot_flags acpi_boot;
77 #ifdef CONFIG_X86_LOCAL_APIC
78 extern int acpi_parse_lapic (acpi_table_entry_header *header);
79 extern int acpi_parse_lapic_addr_ovr (acpi_table_entry_header *header);
80 extern int acpi_parse_lapic_nmi (acpi_table_entry_header *header);
81 #endif /*CONFIG_X86_LOCAL_APIC*/
82 #ifdef CONFIG_X86_IO_APIC
83 extern int acpi_parse_ioapic (acpi_table_entry_header *header);
84 #endif /*CONFIG_X86_IO_APIC*/
85 #endif /*CONFIG_ACPI*/
87 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
91 * Intel MP BIOS table parsing routines:
95 * Checksum an MP configuration block.
98 static int __init mpf_checksum(unsigned char *mp, int len)
108 static void __init MP_processor_info (struct mpc_config_processor *m)
111 static int found_bsp=0;
113 if (!(m->mpc_cpuflag & CPU_ENABLED))
116 printk(KERN_INFO "Processor #%d %d:%d APIC version %d\n",
118 (m->mpc_cpufeature & CPU_FAMILY_MASK)>>8,
119 (m->mpc_cpufeature & CPU_MODEL_MASK)>>4,
122 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
123 Dprintk(" Bootup CPU\n");
124 boot_cpu_id = m->mpc_apicid;
126 if (num_processors >= NR_CPUS) {
127 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
128 " Processor ignored.\n", NR_CPUS);
132 cpu = num_processors++;
134 if (m->mpc_apicid > MAX_APICS) {
135 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
136 m->mpc_apicid, MAX_APICS);
139 ver = m->mpc_apicver;
141 physid_set(m->mpc_apicid, phys_cpu_present_map);
146 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
149 apic_version[m->mpc_apicid] = ver;
150 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
152 * bios_cpu_apicid is required to have processors listed
153 * in same order as logical cpu numbers. Hence the first
154 * entry is BSP, and so on.
158 bios_cpu_apicid[0] = m->mpc_apicid;
159 x86_cpu_to_apicid[0] = m->mpc_apicid;
162 cpu = num_processors - found_bsp;
163 bios_cpu_apicid[cpu] = m->mpc_apicid;
164 x86_cpu_to_apicid[cpu] = m->mpc_apicid;
166 cpu_set(cpu, cpu_possible_map);
167 cpu_set(cpu, cpu_present_map);
170 static void __init MP_bus_info (struct mpc_config_bus *m)
174 memcpy(str, m->mpc_bustype, 6);
176 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
178 if (strncmp(str, "ISA", 3) == 0) {
179 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
180 } else if (strncmp(str, "EISA", 4) == 0) {
181 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
182 } else if (strncmp(str, "PCI", 3) == 0) {
183 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
184 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
186 } else if (strncmp(str, "MCA", 3) == 0) {
187 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
189 printk(KERN_ERR "Unknown bustype %s\n", str);
193 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
195 if (!(m->mpc_flags & MPC_APIC_USABLE))
198 printk("I/O APIC #%d Version %d at 0x%X.\n",
199 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
200 if (nr_ioapics >= MAX_IO_APICS) {
201 printk(KERN_ERR "Max # of I/O APICs (%d) exceeded (found %d).\n",
202 MAX_IO_APICS, nr_ioapics);
203 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
205 if (!m->mpc_apicaddr) {
206 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
207 " found in MP table, skipping!\n");
210 mp_ioapics[nr_ioapics] = *m;
214 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
216 mp_irqs [mp_irq_entries] = *m;
217 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
218 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
219 m->mpc_irqtype, m->mpc_irqflag & 3,
220 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
221 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
222 if (++mp_irq_entries == MAX_IRQ_SOURCES)
223 panic("Max # of irq sources exceeded!!\n");
226 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
228 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
229 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
230 m->mpc_irqtype, m->mpc_irqflag & 3,
231 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
232 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
234 * Well it seems all SMP boards in existence
235 * use ExtINT/LVT1 == LINT0 and
236 * NMI/LVT2 == LINT1 - the following check
237 * will show us if this assumptions is false.
238 * Until then we do not have to add baggage.
240 if ((m->mpc_irqtype == mp_ExtINT) &&
241 (m->mpc_destapiclint != 0))
243 if ((m->mpc_irqtype == mp_NMI) &&
244 (m->mpc_destapiclint != 1))
252 static int __init smp_read_mpc(struct mp_config_table *mpc)
255 int count=sizeof(*mpc);
256 unsigned char *mpt=((unsigned char *)mpc)+count;
258 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
259 printk("SMP mptable: bad signature [%c%c%c%c]!\n",
260 mpc->mpc_signature[0],
261 mpc->mpc_signature[1],
262 mpc->mpc_signature[2],
263 mpc->mpc_signature[3]);
266 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
267 printk("SMP mptable: checksum error!\n");
270 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
271 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
275 if (!mpc->mpc_lapic) {
276 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
279 memcpy(str,mpc->mpc_oem,8);
281 printk(KERN_INFO "OEM ID: %s ",str);
283 memcpy(str,mpc->mpc_productid,12);
285 printk(KERN_INFO "Product ID: %s ",str);
287 printk(KERN_INFO "APIC at: 0x%X\n",mpc->mpc_lapic);
289 /* save the local APIC address, it might be non-default */
291 mp_lapic_addr = mpc->mpc_lapic;
294 * Now process the configuration blocks.
296 while (count < mpc->mpc_length) {
300 struct mpc_config_processor *m=
301 (struct mpc_config_processor *)mpt;
303 MP_processor_info(m);
310 struct mpc_config_bus *m=
311 (struct mpc_config_bus *)mpt;
319 struct mpc_config_ioapic *m=
320 (struct mpc_config_ioapic *)mpt;
328 struct mpc_config_intsrc *m=
329 (struct mpc_config_intsrc *)mpt;
338 struct mpc_config_lintsrc *m=
339 (struct mpc_config_lintsrc *)mpt;
347 clustered_apic_check();
349 printk(KERN_ERR "SMP mptable: no processors registered!\n");
350 return num_processors;
353 static int __init ELCR_trigger(unsigned int irq)
357 port = 0x4d0 + (irq >> 3);
358 return (inb(port) >> (irq & 7)) & 1;
361 static void __init construct_default_ioirq_mptable(int mpc_default_type)
363 struct mpc_config_intsrc intsrc;
365 int ELCR_fallback = 0;
367 intsrc.mpc_type = MP_INTSRC;
368 intsrc.mpc_irqflag = 0; /* conforming */
369 intsrc.mpc_srcbus = 0;
370 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
372 intsrc.mpc_irqtype = mp_INT;
375 * If true, we have an ISA/PCI system with no IRQ entries
376 * in the MP table. To prevent the PCI interrupts from being set up
377 * incorrectly, we try to use the ELCR. The sanity check to see if
378 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
379 * never be level sensitive, so we simply see if the ELCR agrees.
380 * If it does, we assume it's valid.
382 if (mpc_default_type == 5) {
383 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
385 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
386 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
388 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
393 for (i = 0; i < 16; i++) {
394 switch (mpc_default_type) {
396 if (i == 0 || i == 13)
397 continue; /* IRQ0 & IRQ13 not connected */
401 continue; /* IRQ2 is never connected */
406 * If the ELCR indicates a level-sensitive interrupt, we
407 * copy that information over to the MP table in the
408 * irqflag field (level sensitive, active high polarity).
411 intsrc.mpc_irqflag = 13;
413 intsrc.mpc_irqflag = 0;
416 intsrc.mpc_srcbusirq = i;
417 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
418 MP_intsrc_info(&intsrc);
421 intsrc.mpc_irqtype = mp_ExtINT;
422 intsrc.mpc_srcbusirq = 0;
423 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
424 MP_intsrc_info(&intsrc);
427 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
429 struct mpc_config_processor processor;
430 struct mpc_config_bus bus;
431 struct mpc_config_ioapic ioapic;
432 struct mpc_config_lintsrc lintsrc;
433 int linttypes[2] = { mp_ExtINT, mp_NMI };
437 * local APIC has default address
439 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
442 * 2 CPUs, numbered 0 & 1.
444 processor.mpc_type = MP_PROCESSOR;
445 /* Either an integrated APIC or a discrete 82489DX. */
446 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
447 processor.mpc_cpuflag = CPU_ENABLED;
448 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
449 (boot_cpu_data.x86_model << 4) |
450 boot_cpu_data.x86_mask;
451 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
452 processor.mpc_reserved[0] = 0;
453 processor.mpc_reserved[1] = 0;
454 for (i = 0; i < 2; i++) {
455 processor.mpc_apicid = i;
456 MP_processor_info(&processor);
459 bus.mpc_type = MP_BUS;
461 switch (mpc_default_type) {
463 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
468 memcpy(bus.mpc_bustype, "ISA ", 6);
473 memcpy(bus.mpc_bustype, "EISA ", 6);
477 memcpy(bus.mpc_bustype, "MCA ", 6);
480 if (mpc_default_type > 4) {
482 memcpy(bus.mpc_bustype, "PCI ", 6);
486 ioapic.mpc_type = MP_IOAPIC;
487 ioapic.mpc_apicid = 2;
488 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
489 ioapic.mpc_flags = MPC_APIC_USABLE;
490 ioapic.mpc_apicaddr = 0xFEC00000;
491 MP_ioapic_info(&ioapic);
494 * We set up most of the low 16 IO-APIC pins according to MPS rules.
496 construct_default_ioirq_mptable(mpc_default_type);
498 lintsrc.mpc_type = MP_LINTSRC;
499 lintsrc.mpc_irqflag = 0; /* conforming */
500 lintsrc.mpc_srcbusid = 0;
501 lintsrc.mpc_srcbusirq = 0;
502 lintsrc.mpc_destapic = MP_APIC_ALL;
503 for (i = 0; i < 2; i++) {
504 lintsrc.mpc_irqtype = linttypes[i];
505 lintsrc.mpc_destapiclint = i;
506 MP_lintsrc_info(&lintsrc);
510 static struct intel_mp_floating *mpf_found;
513 * Scan the memory blocks for an SMP configuration block.
515 void __init get_smp_config (void)
517 struct intel_mp_floating *mpf = mpf_found;
520 * ACPI supports both logical (e.g. Hyper-Threading) and physical
521 * processors, where MPS only supports physical.
523 if (acpi_lapic && acpi_ioapic) {
524 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
528 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
530 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
531 if (mpf->mpf_feature2 & (1<<7)) {
532 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
535 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
540 * Now see if we need to read further.
542 if (mpf->mpf_feature1 != 0) {
544 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
545 construct_default_ISA_mptable(mpf->mpf_feature1);
547 } else if (mpf->mpf_physptr) {
550 * Read the physical hardware table. Anything here will
551 * override the defaults.
553 if (!smp_read_mpc((void *)(unsigned long)mpf->mpf_physptr)) {
554 smp_found_config = 0;
555 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
556 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
560 * If there are no explicit MP IRQ entries, then we are
561 * broken. We set up most of the low 16 IO-APIC pins to
562 * ISA defaults and hope it will work.
564 if (!mp_irq_entries) {
565 struct mpc_config_bus bus;
567 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
569 bus.mpc_type = MP_BUS;
571 memcpy(bus.mpc_bustype, "ISA ", 6);
574 construct_default_ioirq_mptable(0);
580 printk(KERN_INFO "Processors: %d\n", num_processors);
582 * Only use the first configuration found.
586 static int __init smp_scan_config (unsigned long base, unsigned long length)
588 extern void __bad_mpf_size(void);
589 unsigned int *bp = phys_to_virt(base);
590 struct intel_mp_floating *mpf;
592 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
593 if (sizeof(*mpf) != 16)
597 mpf = (struct intel_mp_floating *)bp;
598 if ((*bp == SMP_MAGIC_IDENT) &&
599 (mpf->mpf_length == 1) &&
600 !mpf_checksum((unsigned char *)bp, 16) &&
601 ((mpf->mpf_specification == 1)
602 || (mpf->mpf_specification == 4)) ) {
604 smp_found_config = 1;
605 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
606 if (mpf->mpf_physptr)
607 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
617 void __init find_intel_smp (void)
619 unsigned int address;
622 * FIXME: Linux assumes you have 640K of base ram..
623 * this continues the error...
625 * 1) Scan the bottom 1K for a signature
626 * 2) Scan the top 1K of base RAM
627 * 3) Scan the 64K of bios
629 if (smp_scan_config(0x0,0x400) ||
630 smp_scan_config(639*0x400,0x400) ||
631 smp_scan_config(0xF0000,0x10000))
634 * If it is an SMP machine we should know now, unless the
635 * configuration is in an EISA/MCA bus machine with an
636 * extended bios data area.
638 * there is a real-mode segmented pointer pointing to the
639 * 4K EBDA area at 0x40E, calculate and scan it here.
641 * NOTE! There are Linux loaders that will corrupt the EBDA
642 * area, and as such this kind of SMP config may be less
643 * trustworthy, simply because the SMP table may have been
644 * stomped on during early boot. These loaders are buggy and
648 address = *(unsigned short *)phys_to_virt(0x40E);
650 if (smp_scan_config(address, 0x1000))
653 /* If we have come this far, we did not find an MP table */
654 printk(KERN_INFO "No mptable found.\n");
658 * - Intel MP Configuration Table
660 void __init find_smp_config (void)
662 #ifdef CONFIG_X86_LOCAL_APIC
668 /* --------------------------------------------------------------------------
669 ACPI-based MP Configuration
670 -------------------------------------------------------------------------- */
674 void __init mp_register_lapic_address (
677 mp_lapic_addr = (unsigned long) address;
679 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
681 if (boot_cpu_id == -1U)
682 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
684 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
688 void __init mp_register_lapic (
692 struct mpc_config_processor processor;
695 if (id >= MAX_APICS) {
696 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
701 if (id == boot_cpu_physical_apicid)
704 processor.mpc_type = MP_PROCESSOR;
705 processor.mpc_apicid = id;
706 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
707 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
708 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
709 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
710 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
711 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
712 processor.mpc_reserved[0] = 0;
713 processor.mpc_reserved[1] = 0;
715 MP_processor_info(&processor);
718 #ifdef CONFIG_X86_IO_APIC
721 #define MP_MAX_IOAPIC_PIN 127
723 static struct mp_ioapic_routing {
727 u32 pin_programmed[4];
728 } mp_ioapic_routing[MAX_IO_APICS];
731 static int mp_find_ioapic (
736 /* Find the IOAPIC that manages this GSI. */
737 for (i = 0; i < nr_ioapics; i++) {
738 if ((gsi >= mp_ioapic_routing[i].gsi_start)
739 && (gsi <= mp_ioapic_routing[i].gsi_end))
743 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
749 void __init mp_register_ioapic (
756 if (nr_ioapics >= MAX_IO_APICS) {
757 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
758 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
759 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
762 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
763 " found in MADT table, skipping!\n");
769 mp_ioapics[idx].mpc_type = MP_IOAPIC;
770 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
771 mp_ioapics[idx].mpc_apicaddr = address;
773 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
774 mp_ioapics[idx].mpc_apicid = id;
775 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
778 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
779 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
781 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
782 mp_ioapic_routing[idx].gsi_start = gsi_base;
783 mp_ioapic_routing[idx].gsi_end = gsi_base +
784 io_apic_get_redir_entries(idx);
786 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
787 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
788 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
789 mp_ioapic_routing[idx].gsi_start,
790 mp_ioapic_routing[idx].gsi_end);
796 void __init mp_override_legacy_irq (
802 struct mpc_config_intsrc intsrc;
807 * Convert 'gsi' to 'ioapic.pin'.
809 ioapic = mp_find_ioapic(gsi);
812 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
815 * TBD: This check is for faulty timer entries, where the override
816 * erroneously sets the trigger to level, resulting in a HUGE
817 * increase of timer interrupts!
819 if ((bus_irq == 0) && (trigger == 3))
822 intsrc.mpc_type = MP_INTSRC;
823 intsrc.mpc_irqtype = mp_INT;
824 intsrc.mpc_irqflag = (trigger << 2) | polarity;
825 intsrc.mpc_srcbus = MP_ISA_BUS;
826 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
827 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
828 intsrc.mpc_dstirq = pin; /* INTIN# */
830 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
831 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
832 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
833 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
835 mp_irqs[mp_irq_entries] = intsrc;
836 if (++mp_irq_entries == MAX_IRQ_SOURCES)
837 panic("Max # of irq sources exceeded!\n");
843 void __init mp_config_acpi_legacy_irqs (void)
845 struct mpc_config_intsrc intsrc;
850 * Fabricate the legacy ISA bus (bus #31).
852 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
853 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
856 * Locate the IOAPIC that manages the ISA IRQs (0-15).
858 ioapic = mp_find_ioapic(0);
862 intsrc.mpc_type = MP_INTSRC;
863 intsrc.mpc_irqflag = 0; /* Conforming */
864 intsrc.mpc_srcbus = MP_ISA_BUS;
865 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
868 * Use the default configuration for the IRQs 0-15. Unless
869 * overridden by (MADT) interrupt source override entries.
871 for (i = 0; i < 16; i++) {
874 for (idx = 0; idx < mp_irq_entries; idx++) {
875 struct mpc_config_intsrc *irq = mp_irqs + idx;
877 /* Do we already have a mapping for this ISA IRQ? */
878 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
881 /* Do we already have a mapping for this IOAPIC pin */
882 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
883 (irq->mpc_dstirq == i))
887 if (idx != mp_irq_entries) {
888 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
889 continue; /* IRQ already used */
892 intsrc.mpc_irqtype = mp_INT;
893 intsrc.mpc_srcbusirq = i; /* Identity mapped */
894 intsrc.mpc_dstirq = i;
896 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
897 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
898 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
899 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
902 mp_irqs[mp_irq_entries] = intsrc;
903 if (++mp_irq_entries == MAX_IRQ_SOURCES)
904 panic("Max # of irq sources exceeded!\n");
910 #define MAX_GSI_NUM 4096
912 int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
917 static int pci_irq = 16;
919 * Mapping between Global System Interrupts, which
920 * represent all possible interrupts, to the IRQs
921 * assigned to actual devices.
923 static int gsi_to_irq[MAX_GSI_NUM];
925 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
928 /* Don't set up the ACPI SCI because it's already set up */
929 if (acpi_fadt.sci_int == gsi)
932 ioapic = mp_find_ioapic(gsi);
934 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
938 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
941 * Avoid pin reprogramming. PRTs typically include entries
942 * with redundant pin->gsi mappings (but unique PCI devices);
943 * we only program the IOAPIC on the first.
945 bit = ioapic_pin % 32;
946 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
948 printk(KERN_ERR "Invalid reference to IOAPIC pin "
949 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
953 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
954 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
955 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
956 return gsi_to_irq[gsi];
959 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
963 * For PCI devices assign IRQs in order, avoiding gaps
964 * due to unused I/O APIC pins.
967 if (gsi < MAX_GSI_NUM) {
971 * Don't assign IRQ used by ACPI SCI
973 if (gsi == acpi_fadt.sci_int)
975 gsi_to_irq[irq] = gsi;
977 printk(KERN_ERR "GSI %u is too high\n", gsi);
982 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
983 edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
984 active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
988 #endif /*CONFIG_X86_IO_APIC*/
989 #endif /*CONFIG_ACPI*/