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/delay.h>
19 #include <linux/config.h>
20 #include <linux/bootmem.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/acpi.h>
25 #include <linux/module.h>
29 #include <asm/mpspec.h>
30 #include <asm/pgalloc.h>
31 #include <asm/io_apic.h>
32 #include <asm/proto.h>
35 /* Have we found an MP table */
37 unsigned int __initdata maxcpus = NR_CPUS;
42 * Various Linux-internal data structures created from the
45 int apic_version [MAX_APICS];
46 unsigned char mp_bus_id_to_type [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
47 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
49 static int mp_current_pci_id = 0;
50 /* I/O APIC entries */
51 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
53 /* # of MP IRQ source entries */
54 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
56 /* MP IRQ source entries */
61 unsigned long mp_lapic_addr = 0;
65 /* Processor that is doing the boot up */
66 unsigned int boot_cpu_id = -1U;
67 /* Internal processor count */
68 static unsigned int num_processors = 0;
70 /* Bitmask of physically existing CPUs */
71 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
73 /* ACPI MADT entry parsing functions */
75 extern struct acpi_boot_flags acpi_boot;
76 #ifdef CONFIG_X86_LOCAL_APIC
77 extern int acpi_parse_lapic (acpi_table_entry_header *header);
78 extern int acpi_parse_lapic_addr_ovr (acpi_table_entry_header *header);
79 extern int acpi_parse_lapic_nmi (acpi_table_entry_header *header);
80 #endif /*CONFIG_X86_LOCAL_APIC*/
81 #ifdef CONFIG_X86_IO_APIC
82 extern int acpi_parse_ioapic (acpi_table_entry_header *header);
83 #endif /*CONFIG_X86_IO_APIC*/
84 #endif /*CONFIG_ACPI*/
86 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
90 * Intel MP BIOS table parsing routines:
94 * Checksum an MP configuration block.
97 static int __init mpf_checksum(unsigned char *mp, int len)
107 static void __init MP_processor_info (struct mpc_config_processor *m)
110 static int found_bsp=0;
112 if (!(m->mpc_cpuflag & CPU_ENABLED))
115 printk(KERN_INFO "Processor #%d %d:%d APIC version %d\n",
117 (m->mpc_cpufeature & CPU_FAMILY_MASK)>>8,
118 (m->mpc_cpufeature & CPU_MODEL_MASK)>>4,
121 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
122 Dprintk(" Bootup CPU\n");
123 boot_cpu_id = m->mpc_apicid;
125 if (num_processors >= NR_CPUS) {
126 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
127 " Processor ignored.\n", NR_CPUS);
131 cpu = num_processors++;
133 if (m->mpc_apicid > MAX_APICS) {
134 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
135 m->mpc_apicid, MAX_APICS);
138 ver = m->mpc_apicver;
140 physid_set(m->mpc_apicid, phys_cpu_present_map);
145 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
148 apic_version[m->mpc_apicid] = ver;
149 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
151 * bios_cpu_apicid is required to have processors listed
152 * in same order as logical cpu numbers. Hence the first
153 * entry is BSP, and so on.
157 bios_cpu_apicid[0] = m->mpc_apicid;
158 x86_cpu_to_apicid[0] = m->mpc_apicid;
161 cpu = num_processors - found_bsp;
162 bios_cpu_apicid[cpu] = m->mpc_apicid;
163 x86_cpu_to_apicid[cpu] = m->mpc_apicid;
165 cpu_set(cpu, cpu_possible_map);
166 cpu_set(cpu, cpu_present_map);
169 static void __init MP_bus_info (struct mpc_config_bus *m)
173 memcpy(str, m->mpc_bustype, 6);
175 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
177 if (strncmp(str, "ISA", 3) == 0) {
178 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
179 } else if (strncmp(str, "EISA", 4) == 0) {
180 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
181 } else if (strncmp(str, "PCI", 3) == 0) {
182 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
183 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
185 } else if (strncmp(str, "MCA", 3) == 0) {
186 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
188 printk(KERN_ERR "Unknown bustype %s\n", str);
192 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
194 if (!(m->mpc_flags & MPC_APIC_USABLE))
197 printk("I/O APIC #%d Version %d at 0x%X.\n",
198 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
199 if (nr_ioapics >= MAX_IO_APICS) {
200 printk(KERN_ERR "Max # of I/O APICs (%d) exceeded (found %d).\n",
201 MAX_IO_APICS, nr_ioapics);
202 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
204 if (!m->mpc_apicaddr) {
205 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
206 " found in MP table, skipping!\n");
209 mp_ioapics[nr_ioapics] = *m;
213 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
215 mp_irqs [mp_irq_entries] = *m;
216 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
217 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
218 m->mpc_irqtype, m->mpc_irqflag & 3,
219 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
220 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
221 if (++mp_irq_entries == MAX_IRQ_SOURCES)
222 panic("Max # of irq sources exceeded!!\n");
225 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
227 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
228 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
229 m->mpc_irqtype, m->mpc_irqflag & 3,
230 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
231 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
233 * Well it seems all SMP boards in existence
234 * use ExtINT/LVT1 == LINT0 and
235 * NMI/LVT2 == LINT1 - the following check
236 * will show us if this assumptions is false.
237 * Until then we do not have to add baggage.
239 if ((m->mpc_irqtype == mp_ExtINT) &&
240 (m->mpc_destapiclint != 0))
242 if ((m->mpc_irqtype == mp_NMI) &&
243 (m->mpc_destapiclint != 1))
251 static int __init smp_read_mpc(struct mp_config_table *mpc)
254 int count=sizeof(*mpc);
255 unsigned char *mpt=((unsigned char *)mpc)+count;
257 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
258 printk("SMP mptable: bad signature [%c%c%c%c]!\n",
259 mpc->mpc_signature[0],
260 mpc->mpc_signature[1],
261 mpc->mpc_signature[2],
262 mpc->mpc_signature[3]);
265 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
266 printk("SMP mptable: checksum error!\n");
269 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
270 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
274 if (!mpc->mpc_lapic) {
275 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
278 memcpy(str,mpc->mpc_oem,8);
280 printk(KERN_INFO "OEM ID: %s ",str);
282 memcpy(str,mpc->mpc_productid,12);
284 printk(KERN_INFO "Product ID: %s ",str);
286 printk(KERN_INFO "APIC at: 0x%X\n",mpc->mpc_lapic);
288 /* save the local APIC address, it might be non-default */
290 mp_lapic_addr = mpc->mpc_lapic;
293 * Now process the configuration blocks.
295 while (count < mpc->mpc_length) {
299 struct mpc_config_processor *m=
300 (struct mpc_config_processor *)mpt;
302 MP_processor_info(m);
309 struct mpc_config_bus *m=
310 (struct mpc_config_bus *)mpt;
318 struct mpc_config_ioapic *m=
319 (struct mpc_config_ioapic *)mpt;
327 struct mpc_config_intsrc *m=
328 (struct mpc_config_intsrc *)mpt;
337 struct mpc_config_lintsrc *m=
338 (struct mpc_config_lintsrc *)mpt;
346 clustered_apic_check();
348 printk(KERN_ERR "SMP mptable: no processors registered!\n");
349 return num_processors;
352 static int __init ELCR_trigger(unsigned int irq)
356 port = 0x4d0 + (irq >> 3);
357 return (inb(port) >> (irq & 7)) & 1;
360 static void __init construct_default_ioirq_mptable(int mpc_default_type)
362 struct mpc_config_intsrc intsrc;
364 int ELCR_fallback = 0;
366 intsrc.mpc_type = MP_INTSRC;
367 intsrc.mpc_irqflag = 0; /* conforming */
368 intsrc.mpc_srcbus = 0;
369 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
371 intsrc.mpc_irqtype = mp_INT;
374 * If true, we have an ISA/PCI system with no IRQ entries
375 * in the MP table. To prevent the PCI interrupts from being set up
376 * incorrectly, we try to use the ELCR. The sanity check to see if
377 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
378 * never be level sensitive, so we simply see if the ELCR agrees.
379 * If it does, we assume it's valid.
381 if (mpc_default_type == 5) {
382 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
384 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
385 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
387 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
392 for (i = 0; i < 16; i++) {
393 switch (mpc_default_type) {
395 if (i == 0 || i == 13)
396 continue; /* IRQ0 & IRQ13 not connected */
400 continue; /* IRQ2 is never connected */
405 * If the ELCR indicates a level-sensitive interrupt, we
406 * copy that information over to the MP table in the
407 * irqflag field (level sensitive, active high polarity).
410 intsrc.mpc_irqflag = 13;
412 intsrc.mpc_irqflag = 0;
415 intsrc.mpc_srcbusirq = i;
416 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
417 MP_intsrc_info(&intsrc);
420 intsrc.mpc_irqtype = mp_ExtINT;
421 intsrc.mpc_srcbusirq = 0;
422 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
423 MP_intsrc_info(&intsrc);
426 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
428 struct mpc_config_processor processor;
429 struct mpc_config_bus bus;
430 struct mpc_config_ioapic ioapic;
431 struct mpc_config_lintsrc lintsrc;
432 int linttypes[2] = { mp_ExtINT, mp_NMI };
436 * local APIC has default address
438 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
441 * 2 CPUs, numbered 0 & 1.
443 processor.mpc_type = MP_PROCESSOR;
444 /* Either an integrated APIC or a discrete 82489DX. */
445 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
446 processor.mpc_cpuflag = CPU_ENABLED;
447 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
448 (boot_cpu_data.x86_model << 4) |
449 boot_cpu_data.x86_mask;
450 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
451 processor.mpc_reserved[0] = 0;
452 processor.mpc_reserved[1] = 0;
453 for (i = 0; i < 2; i++) {
454 processor.mpc_apicid = i;
455 MP_processor_info(&processor);
458 bus.mpc_type = MP_BUS;
460 switch (mpc_default_type) {
462 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
467 memcpy(bus.mpc_bustype, "ISA ", 6);
472 memcpy(bus.mpc_bustype, "EISA ", 6);
476 memcpy(bus.mpc_bustype, "MCA ", 6);
479 if (mpc_default_type > 4) {
481 memcpy(bus.mpc_bustype, "PCI ", 6);
485 ioapic.mpc_type = MP_IOAPIC;
486 ioapic.mpc_apicid = 2;
487 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
488 ioapic.mpc_flags = MPC_APIC_USABLE;
489 ioapic.mpc_apicaddr = 0xFEC00000;
490 MP_ioapic_info(&ioapic);
493 * We set up most of the low 16 IO-APIC pins according to MPS rules.
495 construct_default_ioirq_mptable(mpc_default_type);
497 lintsrc.mpc_type = MP_LINTSRC;
498 lintsrc.mpc_irqflag = 0; /* conforming */
499 lintsrc.mpc_srcbusid = 0;
500 lintsrc.mpc_srcbusirq = 0;
501 lintsrc.mpc_destapic = MP_APIC_ALL;
502 for (i = 0; i < 2; i++) {
503 lintsrc.mpc_irqtype = linttypes[i];
504 lintsrc.mpc_destapiclint = i;
505 MP_lintsrc_info(&lintsrc);
509 static struct intel_mp_floating *mpf_found;
512 * Scan the memory blocks for an SMP configuration block.
514 void __init get_smp_config (void)
516 struct intel_mp_floating *mpf = mpf_found;
519 * ACPI supports both logical (e.g. Hyper-Threading) and physical
520 * processors, where MPS only supports physical.
522 if (acpi_lapic && acpi_ioapic) {
523 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
527 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
529 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
530 if (mpf->mpf_feature2 & (1<<7)) {
531 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
534 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
539 * Now see if we need to read further.
541 if (mpf->mpf_feature1 != 0) {
543 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
544 construct_default_ISA_mptable(mpf->mpf_feature1);
546 } else if (mpf->mpf_physptr) {
549 * Read the physical hardware table. Anything here will
550 * override the defaults.
552 if (!smp_read_mpc((void *)(unsigned long)mpf->mpf_physptr)) {
553 smp_found_config = 0;
554 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
555 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
559 * If there are no explicit MP IRQ entries, then we are
560 * broken. We set up most of the low 16 IO-APIC pins to
561 * ISA defaults and hope it will work.
563 if (!mp_irq_entries) {
564 struct mpc_config_bus bus;
566 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
568 bus.mpc_type = MP_BUS;
570 memcpy(bus.mpc_bustype, "ISA ", 6);
573 construct_default_ioirq_mptable(0);
579 printk(KERN_INFO "Processors: %d\n", num_processors);
581 * Only use the first configuration found.
585 static int __init smp_scan_config (unsigned long base, unsigned long length)
587 extern void __bad_mpf_size(void);
588 unsigned int *bp = phys_to_virt(base);
589 struct intel_mp_floating *mpf;
591 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
592 if (sizeof(*mpf) != 16)
596 mpf = (struct intel_mp_floating *)bp;
597 if ((*bp == SMP_MAGIC_IDENT) &&
598 (mpf->mpf_length == 1) &&
599 !mpf_checksum((unsigned char *)bp, 16) &&
600 ((mpf->mpf_specification == 1)
601 || (mpf->mpf_specification == 4)) ) {
603 smp_found_config = 1;
604 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
605 if (mpf->mpf_physptr)
606 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
616 void __init find_intel_smp (void)
618 unsigned int address;
621 * FIXME: Linux assumes you have 640K of base ram..
622 * this continues the error...
624 * 1) Scan the bottom 1K for a signature
625 * 2) Scan the top 1K of base RAM
626 * 3) Scan the 64K of bios
628 if (smp_scan_config(0x0,0x400) ||
629 smp_scan_config(639*0x400,0x400) ||
630 smp_scan_config(0xF0000,0x10000))
633 * If it is an SMP machine we should know now, unless the
634 * configuration is in an EISA/MCA bus machine with an
635 * extended bios data area.
637 * there is a real-mode segmented pointer pointing to the
638 * 4K EBDA area at 0x40E, calculate and scan it here.
640 * NOTE! There are Linux loaders that will corrupt the EBDA
641 * area, and as such this kind of SMP config may be less
642 * trustworthy, simply because the SMP table may have been
643 * stomped on during early boot. These loaders are buggy and
647 address = *(unsigned short *)phys_to_virt(0x40E);
649 if (smp_scan_config(address, 0x1000))
652 /* If we have come this far, we did not find an MP table */
653 printk(KERN_INFO "No mptable found.\n");
657 * - Intel MP Configuration Table
659 void __init find_smp_config (void)
661 #ifdef CONFIG_X86_LOCAL_APIC
667 /* --------------------------------------------------------------------------
668 ACPI-based MP Configuration
669 -------------------------------------------------------------------------- */
673 void __init mp_register_lapic_address (
676 mp_lapic_addr = (unsigned long) address;
678 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
680 if (boot_cpu_id == -1U)
681 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
683 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
687 void __init mp_register_lapic (
691 struct mpc_config_processor processor;
694 if (id >= MAX_APICS) {
695 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
700 if (id == boot_cpu_physical_apicid)
703 processor.mpc_type = MP_PROCESSOR;
704 processor.mpc_apicid = id;
705 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
706 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
707 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
708 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
709 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
710 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
711 processor.mpc_reserved[0] = 0;
712 processor.mpc_reserved[1] = 0;
714 MP_processor_info(&processor);
717 #ifdef CONFIG_X86_IO_APIC
720 #define MP_MAX_IOAPIC_PIN 127
722 static struct mp_ioapic_routing {
726 u32 pin_programmed[4];
727 } mp_ioapic_routing[MAX_IO_APICS];
730 static int mp_find_ioapic (
735 /* Find the IOAPIC that manages this GSI. */
736 for (i = 0; i < nr_ioapics; i++) {
737 if ((gsi >= mp_ioapic_routing[i].gsi_start)
738 && (gsi <= mp_ioapic_routing[i].gsi_end))
742 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
748 void __init mp_register_ioapic (
755 if (nr_ioapics >= MAX_IO_APICS) {
756 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
757 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
758 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
761 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
762 " found in MADT table, skipping!\n");
768 mp_ioapics[idx].mpc_type = MP_IOAPIC;
769 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
770 mp_ioapics[idx].mpc_apicaddr = address;
772 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
773 mp_ioapics[idx].mpc_apicid = id;
774 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
777 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
778 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
780 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
781 mp_ioapic_routing[idx].gsi_start = gsi_base;
782 mp_ioapic_routing[idx].gsi_end = gsi_base +
783 io_apic_get_redir_entries(idx);
785 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
786 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
787 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
788 mp_ioapic_routing[idx].gsi_start,
789 mp_ioapic_routing[idx].gsi_end);
795 void __init mp_override_legacy_irq (
801 struct mpc_config_intsrc intsrc;
806 * Convert 'gsi' to 'ioapic.pin'.
808 ioapic = mp_find_ioapic(gsi);
811 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
814 * TBD: This check is for faulty timer entries, where the override
815 * erroneously sets the trigger to level, resulting in a HUGE
816 * increase of timer interrupts!
818 if ((bus_irq == 0) && (trigger == 3))
821 intsrc.mpc_type = MP_INTSRC;
822 intsrc.mpc_irqtype = mp_INT;
823 intsrc.mpc_irqflag = (trigger << 2) | polarity;
824 intsrc.mpc_srcbus = MP_ISA_BUS;
825 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
826 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
827 intsrc.mpc_dstirq = pin; /* INTIN# */
829 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
830 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
831 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
832 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
834 mp_irqs[mp_irq_entries] = intsrc;
835 if (++mp_irq_entries == MAX_IRQ_SOURCES)
836 panic("Max # of irq sources exceeded!\n");
842 void __init mp_config_acpi_legacy_irqs (void)
844 struct mpc_config_intsrc intsrc;
849 * Fabricate the legacy ISA bus (bus #31).
851 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
852 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
855 * Locate the IOAPIC that manages the ISA IRQs (0-15).
857 ioapic = mp_find_ioapic(0);
861 intsrc.mpc_type = MP_INTSRC;
862 intsrc.mpc_irqflag = 0; /* Conforming */
863 intsrc.mpc_srcbus = MP_ISA_BUS;
864 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
867 * Use the default configuration for the IRQs 0-15. Unless
868 * overridden by (MADT) interrupt source override entries.
870 for (i = 0; i < 16; i++) {
873 for (idx = 0; idx < mp_irq_entries; idx++) {
874 struct mpc_config_intsrc *irq = mp_irqs + idx;
876 /* Do we already have a mapping for this ISA IRQ? */
877 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
880 /* Do we already have a mapping for this IOAPIC pin */
881 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
882 (irq->mpc_dstirq == i))
886 if (idx != mp_irq_entries) {
887 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
888 continue; /* IRQ already used */
891 intsrc.mpc_irqtype = mp_INT;
892 intsrc.mpc_srcbusirq = i; /* Identity mapped */
893 intsrc.mpc_dstirq = i;
895 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
896 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
897 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
898 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
901 mp_irqs[mp_irq_entries] = intsrc;
902 if (++mp_irq_entries == MAX_IRQ_SOURCES)
903 panic("Max # of irq sources exceeded!\n");
909 #define MAX_GSI_NUM 4096
911 int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
916 static int pci_irq = 16;
918 * Mapping between Global System Interrupts, which
919 * represent all possible interrupts, to the IRQs
920 * assigned to actual devices.
922 static int gsi_to_irq[MAX_GSI_NUM];
924 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
927 /* Don't set up the ACPI SCI because it's already set up */
928 if (acpi_fadt.sci_int == gsi)
931 ioapic = mp_find_ioapic(gsi);
933 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
937 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
940 * Avoid pin reprogramming. PRTs typically include entries
941 * with redundant pin->gsi mappings (but unique PCI devices);
942 * we only program the IOAPIC on the first.
944 bit = ioapic_pin % 32;
945 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
947 printk(KERN_ERR "Invalid reference to IOAPIC pin "
948 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
952 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
953 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
954 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
955 return gsi_to_irq[gsi];
958 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
962 * For PCI devices assign IRQs in order, avoiding gaps
963 * due to unused I/O APIC pins.
966 if (gsi < MAX_GSI_NUM) {
970 * Don't assign IRQ used by ACPI SCI
972 if (gsi == acpi_fadt.sci_int)
974 gsi_to_irq[irq] = gsi;
976 printk(KERN_ERR "GSI %u is too high\n", gsi);
981 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
982 edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
983 active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
987 #endif /*CONFIG_X86_IO_APIC*/
988 #endif /*CONFIG_ACPI*/