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/bootmem.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/mc146818rtc.h>
22 #include <linux/acpi.h>
23 #include <linux/module.h>
27 #include <asm/mpspec.h>
28 #include <asm/pgalloc.h>
29 #include <asm/io_apic.h>
30 #include <asm/proto.h>
33 /* Have we found an MP table */
37 * Various Linux-internal data structures created from the
40 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
41 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
43 static int mp_current_pci_id = 0;
44 /* I/O APIC entries */
45 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
47 /* # of MP IRQ source entries */
48 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
50 /* MP IRQ source entries */
54 unsigned long mp_lapic_addr = 0;
58 /* Processor that is doing the boot up */
59 unsigned int boot_cpu_id = -1U;
60 EXPORT_SYMBOL(boot_cpu_id);
62 /* Internal processor count */
63 unsigned int num_processors __cpuinitdata = 0;
65 unsigned disabled_cpus __cpuinitdata;
67 /* Bitmask of physically existing CPUs */
68 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
70 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
74 * Intel MP BIOS table parsing routines:
78 * Checksum an MP configuration block.
81 static int __init mpf_checksum(unsigned char *mp, int len)
91 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
95 char *bootup_cpu = "";
97 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
101 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
102 bootup_cpu = " (Bootup-CPU)";
103 boot_cpu_id = m->mpc_apicid;
106 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
108 if (num_processors >= NR_CPUS) {
109 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
110 " Processor ignored.\n", NR_CPUS);
115 cpus_complement(tmp_map, cpu_present_map);
116 cpu = first_cpu(tmp_map);
118 physid_set(m->mpc_apicid, phys_cpu_present_map);
119 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
121 * bios_cpu_apicid is required to have processors listed
122 * in same order as logical cpu numbers. Hence the first
123 * entry is BSP, and so on.
127 bios_cpu_apicid[cpu] = m->mpc_apicid;
129 * We get called early in the the start_kernel initialization
130 * process when the per_cpu data area is not yet setup, so we
131 * use a static array that is removed after the per_cpu data
134 if (x86_cpu_to_apicid_ptr) {
135 u8 *x86_cpu_to_apicid = (u8 *)x86_cpu_to_apicid_ptr;
136 x86_cpu_to_apicid[cpu] = m->mpc_apicid;
138 per_cpu(x86_cpu_to_apicid, cpu) = m->mpc_apicid;
141 cpu_set(cpu, cpu_possible_map);
142 cpu_set(cpu, cpu_present_map);
145 static void __init MP_bus_info (struct mpc_config_bus *m)
149 memcpy(str, m->mpc_bustype, 6);
151 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
153 if (strncmp(str, "ISA", 3) == 0) {
154 set_bit(m->mpc_busid, mp_bus_not_pci);
155 } else if (strncmp(str, "PCI", 3) == 0) {
156 clear_bit(m->mpc_busid, mp_bus_not_pci);
157 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
160 printk(KERN_ERR "Unknown bustype %s\n", str);
164 static int bad_ioapic(unsigned long address)
166 if (nr_ioapics >= MAX_IO_APICS) {
167 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
168 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
169 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
172 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
173 " found in table, skipping!\n");
179 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
181 if (!(m->mpc_flags & MPC_APIC_USABLE))
184 printk("I/O APIC #%d at 0x%X.\n",
185 m->mpc_apicid, m->mpc_apicaddr);
187 if (bad_ioapic(m->mpc_apicaddr))
190 mp_ioapics[nr_ioapics] = *m;
194 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
196 mp_irqs [mp_irq_entries] = *m;
197 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
198 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
199 m->mpc_irqtype, m->mpc_irqflag & 3,
200 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
201 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
202 if (++mp_irq_entries >= MAX_IRQ_SOURCES)
203 panic("Max # of irq sources exceeded!!\n");
206 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
208 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
209 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
210 m->mpc_irqtype, m->mpc_irqflag & 3,
211 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
212 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
219 static int __init smp_read_mpc(struct mp_config_table *mpc)
222 int count=sizeof(*mpc);
223 unsigned char *mpt=((unsigned char *)mpc)+count;
225 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
226 printk("MPTABLE: bad signature [%c%c%c%c]!\n",
227 mpc->mpc_signature[0],
228 mpc->mpc_signature[1],
229 mpc->mpc_signature[2],
230 mpc->mpc_signature[3]);
233 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
234 printk("MPTABLE: checksum error!\n");
237 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
238 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
242 if (!mpc->mpc_lapic) {
243 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
246 memcpy(str,mpc->mpc_oem,8);
248 printk(KERN_INFO "MPTABLE: OEM ID: %s ",str);
250 memcpy(str,mpc->mpc_productid,12);
252 printk("MPTABLE: Product ID: %s ",str);
254 printk("MPTABLE: APIC at: 0x%X\n",mpc->mpc_lapic);
256 /* save the local APIC address, it might be non-default */
258 mp_lapic_addr = mpc->mpc_lapic;
261 * Now process the configuration blocks.
263 while (count < mpc->mpc_length) {
267 struct mpc_config_processor *m=
268 (struct mpc_config_processor *)mpt;
270 MP_processor_info(m);
277 struct mpc_config_bus *m=
278 (struct mpc_config_bus *)mpt;
286 struct mpc_config_ioapic *m=
287 (struct mpc_config_ioapic *)mpt;
295 struct mpc_config_intsrc *m=
296 (struct mpc_config_intsrc *)mpt;
305 struct mpc_config_lintsrc *m=
306 (struct mpc_config_lintsrc *)mpt;
314 setup_apic_routing();
316 printk(KERN_ERR "MPTABLE: no processors registered!\n");
317 return num_processors;
320 static int __init ELCR_trigger(unsigned int irq)
324 port = 0x4d0 + (irq >> 3);
325 return (inb(port) >> (irq & 7)) & 1;
328 static void __init construct_default_ioirq_mptable(int mpc_default_type)
330 struct mpc_config_intsrc intsrc;
332 int ELCR_fallback = 0;
334 intsrc.mpc_type = MP_INTSRC;
335 intsrc.mpc_irqflag = 0; /* conforming */
336 intsrc.mpc_srcbus = 0;
337 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
339 intsrc.mpc_irqtype = mp_INT;
342 * If true, we have an ISA/PCI system with no IRQ entries
343 * in the MP table. To prevent the PCI interrupts from being set up
344 * incorrectly, we try to use the ELCR. The sanity check to see if
345 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
346 * never be level sensitive, so we simply see if the ELCR agrees.
347 * If it does, we assume it's valid.
349 if (mpc_default_type == 5) {
350 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
352 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
353 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
355 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
360 for (i = 0; i < 16; i++) {
361 switch (mpc_default_type) {
363 if (i == 0 || i == 13)
364 continue; /* IRQ0 & IRQ13 not connected */
368 continue; /* IRQ2 is never connected */
373 * If the ELCR indicates a level-sensitive interrupt, we
374 * copy that information over to the MP table in the
375 * irqflag field (level sensitive, active high polarity).
378 intsrc.mpc_irqflag = 13;
380 intsrc.mpc_irqflag = 0;
383 intsrc.mpc_srcbusirq = i;
384 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
385 MP_intsrc_info(&intsrc);
388 intsrc.mpc_irqtype = mp_ExtINT;
389 intsrc.mpc_srcbusirq = 0;
390 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
391 MP_intsrc_info(&intsrc);
394 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
396 struct mpc_config_processor processor;
397 struct mpc_config_bus bus;
398 struct mpc_config_ioapic ioapic;
399 struct mpc_config_lintsrc lintsrc;
400 int linttypes[2] = { mp_ExtINT, mp_NMI };
404 * local APIC has default address
406 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
409 * 2 CPUs, numbered 0 & 1.
411 processor.mpc_type = MP_PROCESSOR;
412 processor.mpc_apicver = 0;
413 processor.mpc_cpuflag = CPU_ENABLED;
414 processor.mpc_cpufeature = 0;
415 processor.mpc_featureflag = 0;
416 processor.mpc_reserved[0] = 0;
417 processor.mpc_reserved[1] = 0;
418 for (i = 0; i < 2; i++) {
419 processor.mpc_apicid = i;
420 MP_processor_info(&processor);
423 bus.mpc_type = MP_BUS;
425 switch (mpc_default_type) {
427 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
432 memcpy(bus.mpc_bustype, "ISA ", 6);
436 if (mpc_default_type > 4) {
438 memcpy(bus.mpc_bustype, "PCI ", 6);
442 ioapic.mpc_type = MP_IOAPIC;
443 ioapic.mpc_apicid = 2;
444 ioapic.mpc_apicver = 0;
445 ioapic.mpc_flags = MPC_APIC_USABLE;
446 ioapic.mpc_apicaddr = 0xFEC00000;
447 MP_ioapic_info(&ioapic);
450 * We set up most of the low 16 IO-APIC pins according to MPS rules.
452 construct_default_ioirq_mptable(mpc_default_type);
454 lintsrc.mpc_type = MP_LINTSRC;
455 lintsrc.mpc_irqflag = 0; /* conforming */
456 lintsrc.mpc_srcbusid = 0;
457 lintsrc.mpc_srcbusirq = 0;
458 lintsrc.mpc_destapic = MP_APIC_ALL;
459 for (i = 0; i < 2; i++) {
460 lintsrc.mpc_irqtype = linttypes[i];
461 lintsrc.mpc_destapiclint = i;
462 MP_lintsrc_info(&lintsrc);
466 static struct intel_mp_floating *mpf_found;
469 * Scan the memory blocks for an SMP configuration block.
471 void __init get_smp_config (void)
473 struct intel_mp_floating *mpf = mpf_found;
476 * ACPI supports both logical (e.g. Hyper-Threading) and physical
477 * processors, where MPS only supports physical.
479 if (acpi_lapic && acpi_ioapic) {
480 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
484 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
486 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
489 * Now see if we need to read further.
491 if (mpf->mpf_feature1 != 0) {
493 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
494 construct_default_ISA_mptable(mpf->mpf_feature1);
496 } else if (mpf->mpf_physptr) {
499 * Read the physical hardware table. Anything here will
500 * override the defaults.
502 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
503 smp_found_config = 0;
504 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
505 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
509 * If there are no explicit MP IRQ entries, then we are
510 * broken. We set up most of the low 16 IO-APIC pins to
511 * ISA defaults and hope it will work.
513 if (!mp_irq_entries) {
514 struct mpc_config_bus bus;
516 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
518 bus.mpc_type = MP_BUS;
520 memcpy(bus.mpc_bustype, "ISA ", 6);
523 construct_default_ioirq_mptable(0);
529 printk(KERN_INFO "Processors: %d\n", num_processors);
531 * Only use the first configuration found.
535 static int __init smp_scan_config (unsigned long base, unsigned long length)
537 extern void __bad_mpf_size(void);
538 unsigned int *bp = phys_to_virt(base);
539 struct intel_mp_floating *mpf;
541 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
542 if (sizeof(*mpf) != 16)
546 mpf = (struct intel_mp_floating *)bp;
547 if ((*bp == SMP_MAGIC_IDENT) &&
548 (mpf->mpf_length == 1) &&
549 !mpf_checksum((unsigned char *)bp, 16) &&
550 ((mpf->mpf_specification == 1)
551 || (mpf->mpf_specification == 4)) ) {
553 smp_found_config = 1;
554 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
555 if (mpf->mpf_physptr)
556 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
566 void __init find_smp_config(void)
568 unsigned int address;
571 * FIXME: Linux assumes you have 640K of base ram..
572 * this continues the error...
574 * 1) Scan the bottom 1K for a signature
575 * 2) Scan the top 1K of base RAM
576 * 3) Scan the 64K of bios
578 if (smp_scan_config(0x0,0x400) ||
579 smp_scan_config(639*0x400,0x400) ||
580 smp_scan_config(0xF0000,0x10000))
583 * If it is an SMP machine we should know now.
585 * there is a real-mode segmented pointer pointing to the
586 * 4K EBDA area at 0x40E, calculate and scan it here.
588 * NOTE! There are Linux loaders that will corrupt the EBDA
589 * area, and as such this kind of SMP config may be less
590 * trustworthy, simply because the SMP table may have been
591 * stomped on during early boot. These loaders are buggy and
595 address = *(unsigned short *)phys_to_virt(0x40E);
597 if (smp_scan_config(address, 0x1000))
600 /* If we have come this far, we did not find an MP table */
601 printk(KERN_INFO "No mptable found.\n");
604 /* --------------------------------------------------------------------------
605 ACPI-based MP Configuration
606 -------------------------------------------------------------------------- */
610 void __init mp_register_lapic_address(u64 address)
612 mp_lapic_addr = (unsigned long) address;
613 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
614 if (boot_cpu_id == -1U)
615 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
618 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
620 struct mpc_config_processor processor;
623 if (id == boot_cpu_id)
626 processor.mpc_type = MP_PROCESSOR;
627 processor.mpc_apicid = id;
628 processor.mpc_apicver = 0;
629 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
630 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
631 processor.mpc_cpufeature = 0;
632 processor.mpc_featureflag = 0;
633 processor.mpc_reserved[0] = 0;
634 processor.mpc_reserved[1] = 0;
636 MP_processor_info(&processor);
640 #define MP_MAX_IOAPIC_PIN 127
642 static struct mp_ioapic_routing {
646 u32 pin_programmed[4];
647 } mp_ioapic_routing[MAX_IO_APICS];
649 static int mp_find_ioapic(int gsi)
653 /* Find the IOAPIC that manages this GSI. */
654 for (i = 0; i < nr_ioapics; i++) {
655 if ((gsi >= mp_ioapic_routing[i].gsi_start)
656 && (gsi <= mp_ioapic_routing[i].gsi_end))
660 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
664 static u8 uniq_ioapic_id(u8 id)
667 DECLARE_BITMAP(used, 256);
668 bitmap_zero(used, 256);
669 for (i = 0; i < nr_ioapics; i++) {
670 struct mpc_config_ioapic *ia = &mp_ioapics[i];
671 __set_bit(ia->mpc_apicid, used);
673 if (!test_bit(id, used))
675 return find_first_zero_bit(used, 256);
678 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
682 if (bad_ioapic(address))
687 mp_ioapics[idx].mpc_type = MP_IOAPIC;
688 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
689 mp_ioapics[idx].mpc_apicaddr = address;
691 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
692 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
693 mp_ioapics[idx].mpc_apicver = 0;
696 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
697 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
699 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
700 mp_ioapic_routing[idx].gsi_start = gsi_base;
701 mp_ioapic_routing[idx].gsi_end = gsi_base +
702 io_apic_get_redir_entries(idx);
704 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
705 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
706 mp_ioapics[idx].mpc_apicaddr,
707 mp_ioapic_routing[idx].gsi_start,
708 mp_ioapic_routing[idx].gsi_end);
714 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
716 struct mpc_config_intsrc intsrc;
721 * Convert 'gsi' to 'ioapic.pin'.
723 ioapic = mp_find_ioapic(gsi);
726 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
729 * TBD: This check is for faulty timer entries, where the override
730 * erroneously sets the trigger to level, resulting in a HUGE
731 * increase of timer interrupts!
733 if ((bus_irq == 0) && (trigger == 3))
736 intsrc.mpc_type = MP_INTSRC;
737 intsrc.mpc_irqtype = mp_INT;
738 intsrc.mpc_irqflag = (trigger << 2) | polarity;
739 intsrc.mpc_srcbus = MP_ISA_BUS;
740 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
741 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
742 intsrc.mpc_dstirq = pin; /* INTIN# */
744 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
745 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
746 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
747 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
749 mp_irqs[mp_irq_entries] = intsrc;
750 if (++mp_irq_entries == MAX_IRQ_SOURCES)
751 panic("Max # of irq sources exceeded!\n");
754 void __init mp_config_acpi_legacy_irqs(void)
756 struct mpc_config_intsrc intsrc;
761 * Fabricate the legacy ISA bus (bus #31).
763 set_bit(MP_ISA_BUS, mp_bus_not_pci);
766 * Locate the IOAPIC that manages the ISA IRQs (0-15).
768 ioapic = mp_find_ioapic(0);
772 intsrc.mpc_type = MP_INTSRC;
773 intsrc.mpc_irqflag = 0; /* Conforming */
774 intsrc.mpc_srcbus = MP_ISA_BUS;
775 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
778 * Use the default configuration for the IRQs 0-15. Unless
779 * overridden by (MADT) interrupt source override entries.
781 for (i = 0; i < 16; i++) {
784 for (idx = 0; idx < mp_irq_entries; idx++) {
785 struct mpc_config_intsrc *irq = mp_irqs + idx;
787 /* Do we already have a mapping for this ISA IRQ? */
788 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
791 /* Do we already have a mapping for this IOAPIC pin */
792 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
793 (irq->mpc_dstirq == i))
797 if (idx != mp_irq_entries) {
798 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
799 continue; /* IRQ already used */
802 intsrc.mpc_irqtype = mp_INT;
803 intsrc.mpc_srcbusirq = i; /* Identity mapped */
804 intsrc.mpc_dstirq = i;
806 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
807 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
808 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
809 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
812 mp_irqs[mp_irq_entries] = intsrc;
813 if (++mp_irq_entries == MAX_IRQ_SOURCES)
814 panic("Max # of irq sources exceeded!\n");
818 int mp_register_gsi(u32 gsi, int triggering, int polarity)
824 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
827 /* Don't set up the ACPI SCI because it's already set up */
828 if (acpi_gbl_FADT.sci_interrupt == gsi)
831 ioapic = mp_find_ioapic(gsi);
833 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
837 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
840 * Avoid pin reprogramming. PRTs typically include entries
841 * with redundant pin->gsi mappings (but unique PCI devices);
842 * we only program the IOAPIC on the first.
844 bit = ioapic_pin % 32;
845 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
847 printk(KERN_ERR "Invalid reference to IOAPIC pin "
848 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
852 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
853 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
854 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
858 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
860 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
861 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
862 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
865 #endif /*CONFIG_ACPI*/