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;
65 unsigned disabled_cpus __cpuinitdata;
67 /* Bitmask of physically existing CPUs */
68 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
70 u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
71 = { [0 ... NR_CPUS-1] = BAD_APICID };
72 void *x86_bios_cpu_apicid_early_ptr;
73 DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
74 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
78 * Intel MP BIOS table parsing routines:
82 * Checksum an MP configuration block.
85 static int __init mpf_checksum(unsigned char *mp, int len)
95 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
99 char *bootup_cpu = "";
101 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
105 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
106 bootup_cpu = " (Bootup-CPU)";
107 boot_cpu_id = m->mpc_apicid;
110 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
112 if (num_processors >= NR_CPUS) {
113 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
114 " Processor ignored.\n", NR_CPUS);
119 cpus_complement(tmp_map, cpu_present_map);
120 cpu = first_cpu(tmp_map);
122 physid_set(m->mpc_apicid, phys_cpu_present_map);
123 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
125 * x86_bios_cpu_apicid is required to have processors listed
126 * in same order as logical cpu numbers. Hence the first
127 * entry is BSP, and so on.
131 /* are we being called early in kernel startup? */
132 if (x86_cpu_to_apicid_early_ptr) {
133 u16 *cpu_to_apicid = x86_cpu_to_apicid_early_ptr;
134 u16 *bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr;
136 cpu_to_apicid[cpu] = m->mpc_apicid;
137 bios_cpu_apicid[cpu] = m->mpc_apicid;
139 per_cpu(x86_cpu_to_apicid, cpu) = m->mpc_apicid;
140 per_cpu(x86_bios_cpu_apicid, cpu) = m->mpc_apicid;
143 cpu_set(cpu, cpu_possible_map);
144 cpu_set(cpu, cpu_present_map);
147 static void __init MP_bus_info (struct mpc_config_bus *m)
151 memcpy(str, m->mpc_bustype, 6);
153 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
155 if (strncmp(str, "ISA", 3) == 0) {
156 set_bit(m->mpc_busid, mp_bus_not_pci);
157 } else if (strncmp(str, "PCI", 3) == 0) {
158 clear_bit(m->mpc_busid, mp_bus_not_pci);
159 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
162 printk(KERN_ERR "Unknown bustype %s\n", str);
166 static int bad_ioapic(unsigned long address)
168 if (nr_ioapics >= MAX_IO_APICS) {
169 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
170 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
171 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
174 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
175 " found in table, skipping!\n");
181 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
183 if (!(m->mpc_flags & MPC_APIC_USABLE))
186 printk("I/O APIC #%d at 0x%X.\n",
187 m->mpc_apicid, m->mpc_apicaddr);
189 if (bad_ioapic(m->mpc_apicaddr))
192 mp_ioapics[nr_ioapics] = *m;
196 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
198 mp_irqs [mp_irq_entries] = *m;
199 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
200 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
201 m->mpc_irqtype, m->mpc_irqflag & 3,
202 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
203 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
204 if (++mp_irq_entries >= MAX_IRQ_SOURCES)
205 panic("Max # of irq sources exceeded!!\n");
208 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
210 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
211 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
212 m->mpc_irqtype, m->mpc_irqflag & 3,
213 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
214 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
221 static int __init smp_read_mpc(struct mp_config_table *mpc)
224 int count=sizeof(*mpc);
225 unsigned char *mpt=((unsigned char *)mpc)+count;
227 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
228 printk("MPTABLE: bad signature [%c%c%c%c]!\n",
229 mpc->mpc_signature[0],
230 mpc->mpc_signature[1],
231 mpc->mpc_signature[2],
232 mpc->mpc_signature[3]);
235 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
236 printk("MPTABLE: checksum error!\n");
239 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
240 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
244 if (!mpc->mpc_lapic) {
245 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
248 memcpy(str,mpc->mpc_oem,8);
250 printk(KERN_INFO "MPTABLE: OEM ID: %s ",str);
252 memcpy(str,mpc->mpc_productid,12);
254 printk("MPTABLE: Product ID: %s ",str);
256 printk("MPTABLE: APIC at: 0x%X\n",mpc->mpc_lapic);
258 /* save the local APIC address, it might be non-default */
260 mp_lapic_addr = mpc->mpc_lapic;
263 * Now process the configuration blocks.
265 while (count < mpc->mpc_length) {
269 struct mpc_config_processor *m=
270 (struct mpc_config_processor *)mpt;
272 MP_processor_info(m);
279 struct mpc_config_bus *m=
280 (struct mpc_config_bus *)mpt;
288 struct mpc_config_ioapic *m=
289 (struct mpc_config_ioapic *)mpt;
297 struct mpc_config_intsrc *m=
298 (struct mpc_config_intsrc *)mpt;
307 struct mpc_config_lintsrc *m=
308 (struct mpc_config_lintsrc *)mpt;
316 setup_apic_routing();
318 printk(KERN_ERR "MPTABLE: no processors registered!\n");
319 return num_processors;
322 static int __init ELCR_trigger(unsigned int irq)
326 port = 0x4d0 + (irq >> 3);
327 return (inb(port) >> (irq & 7)) & 1;
330 static void __init construct_default_ioirq_mptable(int mpc_default_type)
332 struct mpc_config_intsrc intsrc;
334 int ELCR_fallback = 0;
336 intsrc.mpc_type = MP_INTSRC;
337 intsrc.mpc_irqflag = 0; /* conforming */
338 intsrc.mpc_srcbus = 0;
339 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
341 intsrc.mpc_irqtype = mp_INT;
344 * If true, we have an ISA/PCI system with no IRQ entries
345 * in the MP table. To prevent the PCI interrupts from being set up
346 * incorrectly, we try to use the ELCR. The sanity check to see if
347 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
348 * never be level sensitive, so we simply see if the ELCR agrees.
349 * If it does, we assume it's valid.
351 if (mpc_default_type == 5) {
352 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
354 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
355 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
357 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
362 for (i = 0; i < 16; i++) {
363 switch (mpc_default_type) {
365 if (i == 0 || i == 13)
366 continue; /* IRQ0 & IRQ13 not connected */
370 continue; /* IRQ2 is never connected */
375 * If the ELCR indicates a level-sensitive interrupt, we
376 * copy that information over to the MP table in the
377 * irqflag field (level sensitive, active high polarity).
380 intsrc.mpc_irqflag = 13;
382 intsrc.mpc_irqflag = 0;
385 intsrc.mpc_srcbusirq = i;
386 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
387 MP_intsrc_info(&intsrc);
390 intsrc.mpc_irqtype = mp_ExtINT;
391 intsrc.mpc_srcbusirq = 0;
392 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
393 MP_intsrc_info(&intsrc);
396 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
398 struct mpc_config_processor processor;
399 struct mpc_config_bus bus;
400 struct mpc_config_ioapic ioapic;
401 struct mpc_config_lintsrc lintsrc;
402 int linttypes[2] = { mp_ExtINT, mp_NMI };
406 * local APIC has default address
408 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
411 * 2 CPUs, numbered 0 & 1.
413 processor.mpc_type = MP_PROCESSOR;
414 processor.mpc_apicver = 0;
415 processor.mpc_cpuflag = CPU_ENABLED;
416 processor.mpc_cpufeature = 0;
417 processor.mpc_featureflag = 0;
418 processor.mpc_reserved[0] = 0;
419 processor.mpc_reserved[1] = 0;
420 for (i = 0; i < 2; i++) {
421 processor.mpc_apicid = i;
422 MP_processor_info(&processor);
425 bus.mpc_type = MP_BUS;
427 switch (mpc_default_type) {
429 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
434 memcpy(bus.mpc_bustype, "ISA ", 6);
438 if (mpc_default_type > 4) {
440 memcpy(bus.mpc_bustype, "PCI ", 6);
444 ioapic.mpc_type = MP_IOAPIC;
445 ioapic.mpc_apicid = 2;
446 ioapic.mpc_apicver = 0;
447 ioapic.mpc_flags = MPC_APIC_USABLE;
448 ioapic.mpc_apicaddr = 0xFEC00000;
449 MP_ioapic_info(&ioapic);
452 * We set up most of the low 16 IO-APIC pins according to MPS rules.
454 construct_default_ioirq_mptable(mpc_default_type);
456 lintsrc.mpc_type = MP_LINTSRC;
457 lintsrc.mpc_irqflag = 0; /* conforming */
458 lintsrc.mpc_srcbusid = 0;
459 lintsrc.mpc_srcbusirq = 0;
460 lintsrc.mpc_destapic = MP_APIC_ALL;
461 for (i = 0; i < 2; i++) {
462 lintsrc.mpc_irqtype = linttypes[i];
463 lintsrc.mpc_destapiclint = i;
464 MP_lintsrc_info(&lintsrc);
468 static struct intel_mp_floating *mpf_found;
471 * Scan the memory blocks for an SMP configuration block.
473 void __init get_smp_config (void)
475 struct intel_mp_floating *mpf = mpf_found;
478 * ACPI supports both logical (e.g. Hyper-Threading) and physical
479 * processors, where MPS only supports physical.
481 if (acpi_lapic && acpi_ioapic) {
482 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
486 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
488 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
491 * Now see if we need to read further.
493 if (mpf->mpf_feature1 != 0) {
495 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
496 construct_default_ISA_mptable(mpf->mpf_feature1);
498 } else if (mpf->mpf_physptr) {
501 * Read the physical hardware table. Anything here will
502 * override the defaults.
504 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
505 smp_found_config = 0;
506 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
507 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
511 * If there are no explicit MP IRQ entries, then we are
512 * broken. We set up most of the low 16 IO-APIC pins to
513 * ISA defaults and hope it will work.
515 if (!mp_irq_entries) {
516 struct mpc_config_bus bus;
518 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
520 bus.mpc_type = MP_BUS;
522 memcpy(bus.mpc_bustype, "ISA ", 6);
525 construct_default_ioirq_mptable(0);
531 printk(KERN_INFO "Processors: %d\n", num_processors);
533 * Only use the first configuration found.
537 static int __init smp_scan_config (unsigned long base, unsigned long length)
539 extern void __bad_mpf_size(void);
540 unsigned int *bp = phys_to_virt(base);
541 struct intel_mp_floating *mpf;
543 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
544 if (sizeof(*mpf) != 16)
548 mpf = (struct intel_mp_floating *)bp;
549 if ((*bp == SMP_MAGIC_IDENT) &&
550 (mpf->mpf_length == 1) &&
551 !mpf_checksum((unsigned char *)bp, 16) &&
552 ((mpf->mpf_specification == 1)
553 || (mpf->mpf_specification == 4)) ) {
555 smp_found_config = 1;
556 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
557 if (mpf->mpf_physptr)
558 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
568 void __init find_smp_config(void)
570 unsigned int address;
573 * FIXME: Linux assumes you have 640K of base ram..
574 * this continues the error...
576 * 1) Scan the bottom 1K for a signature
577 * 2) Scan the top 1K of base RAM
578 * 3) Scan the 64K of bios
580 if (smp_scan_config(0x0,0x400) ||
581 smp_scan_config(639*0x400,0x400) ||
582 smp_scan_config(0xF0000,0x10000))
585 * If it is an SMP machine we should know now.
587 * there is a real-mode segmented pointer pointing to the
588 * 4K EBDA area at 0x40E, calculate and scan it here.
590 * NOTE! There are Linux loaders that will corrupt the EBDA
591 * area, and as such this kind of SMP config may be less
592 * trustworthy, simply because the SMP table may have been
593 * stomped on during early boot. These loaders are buggy and
597 address = *(unsigned short *)phys_to_virt(0x40E);
599 if (smp_scan_config(address, 0x1000))
602 /* If we have come this far, we did not find an MP table */
603 printk(KERN_INFO "No mptable found.\n");
606 /* --------------------------------------------------------------------------
607 ACPI-based MP Configuration
608 -------------------------------------------------------------------------- */
612 void __init mp_register_lapic_address(u64 address)
614 mp_lapic_addr = (unsigned long) address;
615 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
616 if (boot_cpu_id == -1U)
617 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
620 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
622 struct mpc_config_processor processor;
625 if (id == boot_cpu_id)
628 processor.mpc_type = MP_PROCESSOR;
629 processor.mpc_apicid = id;
630 processor.mpc_apicver = 0;
631 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
632 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
633 processor.mpc_cpufeature = 0;
634 processor.mpc_featureflag = 0;
635 processor.mpc_reserved[0] = 0;
636 processor.mpc_reserved[1] = 0;
638 MP_processor_info(&processor);
642 #define MP_MAX_IOAPIC_PIN 127
644 static struct mp_ioapic_routing {
648 u32 pin_programmed[4];
649 } mp_ioapic_routing[MAX_IO_APICS];
651 static int mp_find_ioapic(int gsi)
655 /* Find the IOAPIC that manages this GSI. */
656 for (i = 0; i < nr_ioapics; i++) {
657 if ((gsi >= mp_ioapic_routing[i].gsi_start)
658 && (gsi <= mp_ioapic_routing[i].gsi_end))
662 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
666 static u8 uniq_ioapic_id(u8 id)
669 DECLARE_BITMAP(used, 256);
670 bitmap_zero(used, 256);
671 for (i = 0; i < nr_ioapics; i++) {
672 struct mpc_config_ioapic *ia = &mp_ioapics[i];
673 __set_bit(ia->mpc_apicid, used);
675 if (!test_bit(id, used))
677 return find_first_zero_bit(used, 256);
680 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
684 if (bad_ioapic(address))
689 mp_ioapics[idx].mpc_type = MP_IOAPIC;
690 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
691 mp_ioapics[idx].mpc_apicaddr = address;
693 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
694 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
695 mp_ioapics[idx].mpc_apicver = 0;
698 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
699 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
701 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
702 mp_ioapic_routing[idx].gsi_start = gsi_base;
703 mp_ioapic_routing[idx].gsi_end = gsi_base +
704 io_apic_get_redir_entries(idx);
706 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
707 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
708 mp_ioapics[idx].mpc_apicaddr,
709 mp_ioapic_routing[idx].gsi_start,
710 mp_ioapic_routing[idx].gsi_end);
716 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
718 struct mpc_config_intsrc intsrc;
723 * Convert 'gsi' to 'ioapic.pin'.
725 ioapic = mp_find_ioapic(gsi);
728 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
731 * TBD: This check is for faulty timer entries, where the override
732 * erroneously sets the trigger to level, resulting in a HUGE
733 * increase of timer interrupts!
735 if ((bus_irq == 0) && (trigger == 3))
738 intsrc.mpc_type = MP_INTSRC;
739 intsrc.mpc_irqtype = mp_INT;
740 intsrc.mpc_irqflag = (trigger << 2) | polarity;
741 intsrc.mpc_srcbus = MP_ISA_BUS;
742 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
743 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
744 intsrc.mpc_dstirq = pin; /* INTIN# */
746 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
747 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
748 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
749 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
751 mp_irqs[mp_irq_entries] = intsrc;
752 if (++mp_irq_entries == MAX_IRQ_SOURCES)
753 panic("Max # of irq sources exceeded!\n");
756 void __init mp_config_acpi_legacy_irqs(void)
758 struct mpc_config_intsrc intsrc;
763 * Fabricate the legacy ISA bus (bus #31).
765 set_bit(MP_ISA_BUS, mp_bus_not_pci);
768 * Locate the IOAPIC that manages the ISA IRQs (0-15).
770 ioapic = mp_find_ioapic(0);
774 intsrc.mpc_type = MP_INTSRC;
775 intsrc.mpc_irqflag = 0; /* Conforming */
776 intsrc.mpc_srcbus = MP_ISA_BUS;
777 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
780 * Use the default configuration for the IRQs 0-15. Unless
781 * overridden by (MADT) interrupt source override entries.
783 for (i = 0; i < 16; i++) {
786 for (idx = 0; idx < mp_irq_entries; idx++) {
787 struct mpc_config_intsrc *irq = mp_irqs + idx;
789 /* Do we already have a mapping for this ISA IRQ? */
790 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
793 /* Do we already have a mapping for this IOAPIC pin */
794 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
795 (irq->mpc_dstirq == i))
799 if (idx != mp_irq_entries) {
800 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
801 continue; /* IRQ already used */
804 intsrc.mpc_irqtype = mp_INT;
805 intsrc.mpc_srcbusirq = i; /* Identity mapped */
806 intsrc.mpc_dstirq = i;
808 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
809 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
810 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
811 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
814 mp_irqs[mp_irq_entries] = intsrc;
815 if (++mp_irq_entries == MAX_IRQ_SOURCES)
816 panic("Max # of irq sources exceeded!\n");
820 int mp_register_gsi(u32 gsi, int triggering, int polarity)
826 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
829 /* Don't set up the ACPI SCI because it's already set up */
830 if (acpi_gbl_FADT.sci_interrupt == gsi)
833 ioapic = mp_find_ioapic(gsi);
835 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
839 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
842 * Avoid pin reprogramming. PRTs typically include entries
843 * with redundant pin->gsi mappings (but unique PCI devices);
844 * we only program the IOAPIC on the first.
846 bit = ioapic_pin % 32;
847 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
849 printk(KERN_ERR "Invalid reference to IOAPIC pin "
850 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
854 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
855 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
856 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
860 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
862 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
863 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
864 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
867 #endif /*CONFIG_ACPI*/