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 */
35 unsigned int __cpuinitdata maxcpus = NR_CPUS;
38 * Various Linux-internal data structures created from the
41 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
42 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
44 static int mp_current_pci_id = 0;
45 /* I/O APIC entries */
46 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
48 /* # of MP IRQ source entries */
49 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
51 /* MP IRQ source entries */
55 unsigned long mp_lapic_addr = 0;
59 /* Processor that is doing the boot up */
60 unsigned int boot_cpu_id = -1U;
61 EXPORT_SYMBOL(boot_cpu_id);
63 /* Internal processor count */
64 unsigned int num_processors;
66 unsigned disabled_cpus __cpuinitdata;
68 /* Bitmask of physically existing CPUs */
69 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
71 u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
72 = { [0 ... NR_CPUS-1] = BAD_APICID };
73 void *x86_bios_cpu_apicid_early_ptr;
74 DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
75 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
79 * Intel MP BIOS table parsing routines:
83 * Checksum an MP configuration block.
86 static int __init mpf_checksum(unsigned char *mp, int len)
96 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
100 char *bootup_cpu = "";
102 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
106 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
107 bootup_cpu = " (Bootup-CPU)";
108 boot_cpu_id = m->mpc_apicid;
111 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
113 if (num_processors >= NR_CPUS) {
114 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
115 " Processor ignored.\n", NR_CPUS);
119 if (num_processors >= maxcpus) {
120 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
121 " Processor ignored.\n", maxcpus);
126 cpus_complement(tmp_map, cpu_present_map);
127 cpu = first_cpu(tmp_map);
129 physid_set(m->mpc_apicid, phys_cpu_present_map);
130 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
132 * x86_bios_cpu_apicid is required to have processors listed
133 * in same order as logical cpu numbers. Hence the first
134 * entry is BSP, and so on.
138 /* are we being called early in kernel startup? */
139 if (x86_cpu_to_apicid_early_ptr) {
140 u16 *cpu_to_apicid = x86_cpu_to_apicid_early_ptr;
141 u16 *bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr;
143 cpu_to_apicid[cpu] = m->mpc_apicid;
144 bios_cpu_apicid[cpu] = m->mpc_apicid;
146 per_cpu(x86_cpu_to_apicid, cpu) = m->mpc_apicid;
147 per_cpu(x86_bios_cpu_apicid, cpu) = m->mpc_apicid;
150 cpu_set(cpu, cpu_possible_map);
151 cpu_set(cpu, cpu_present_map);
154 static void __init MP_bus_info (struct mpc_config_bus *m)
158 memcpy(str, m->mpc_bustype, 6);
160 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
162 if (strncmp(str, "ISA", 3) == 0) {
163 set_bit(m->mpc_busid, mp_bus_not_pci);
164 } else if (strncmp(str, "PCI", 3) == 0) {
165 clear_bit(m->mpc_busid, mp_bus_not_pci);
166 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
169 printk(KERN_ERR "Unknown bustype %s\n", str);
173 static int bad_ioapic(unsigned long address)
175 if (nr_ioapics >= MAX_IO_APICS) {
176 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
177 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
178 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
181 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
182 " found in table, skipping!\n");
188 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
190 if (!(m->mpc_flags & MPC_APIC_USABLE))
193 printk("I/O APIC #%d at 0x%X.\n",
194 m->mpc_apicid, m->mpc_apicaddr);
196 if (bad_ioapic(m->mpc_apicaddr))
199 mp_ioapics[nr_ioapics] = *m;
203 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
205 mp_irqs [mp_irq_entries] = *m;
206 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
207 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
208 m->mpc_irqtype, m->mpc_irqflag & 3,
209 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
210 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
211 if (++mp_irq_entries >= MAX_IRQ_SOURCES)
212 panic("Max # of irq sources exceeded!!\n");
215 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
217 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
218 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
219 m->mpc_irqtype, m->mpc_irqflag & 3,
220 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
221 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
228 static int __init smp_read_mpc(struct mp_config_table *mpc)
231 int count=sizeof(*mpc);
232 unsigned char *mpt=((unsigned char *)mpc)+count;
234 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
235 printk("MPTABLE: bad signature [%c%c%c%c]!\n",
236 mpc->mpc_signature[0],
237 mpc->mpc_signature[1],
238 mpc->mpc_signature[2],
239 mpc->mpc_signature[3]);
242 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
243 printk("MPTABLE: checksum error!\n");
246 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
247 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
251 if (!mpc->mpc_lapic) {
252 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
255 memcpy(str,mpc->mpc_oem,8);
257 printk(KERN_INFO "MPTABLE: OEM ID: %s ",str);
259 memcpy(str,mpc->mpc_productid,12);
261 printk("MPTABLE: Product ID: %s ",str);
263 printk("MPTABLE: APIC at: 0x%X\n",mpc->mpc_lapic);
265 /* save the local APIC address, it might be non-default */
267 mp_lapic_addr = mpc->mpc_lapic;
270 * Now process the configuration blocks.
272 while (count < mpc->mpc_length) {
276 struct mpc_config_processor *m=
277 (struct mpc_config_processor *)mpt;
279 MP_processor_info(m);
286 struct mpc_config_bus *m=
287 (struct mpc_config_bus *)mpt;
295 struct mpc_config_ioapic *m=
296 (struct mpc_config_ioapic *)mpt;
304 struct mpc_config_intsrc *m=
305 (struct mpc_config_intsrc *)mpt;
314 struct mpc_config_lintsrc *m=
315 (struct mpc_config_lintsrc *)mpt;
323 setup_apic_routing();
325 printk(KERN_ERR "MPTABLE: no processors registered!\n");
326 return num_processors;
329 static int __init ELCR_trigger(unsigned int irq)
333 port = 0x4d0 + (irq >> 3);
334 return (inb(port) >> (irq & 7)) & 1;
337 static void __init construct_default_ioirq_mptable(int mpc_default_type)
339 struct mpc_config_intsrc intsrc;
341 int ELCR_fallback = 0;
343 intsrc.mpc_type = MP_INTSRC;
344 intsrc.mpc_irqflag = 0; /* conforming */
345 intsrc.mpc_srcbus = 0;
346 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
348 intsrc.mpc_irqtype = mp_INT;
351 * If true, we have an ISA/PCI system with no IRQ entries
352 * in the MP table. To prevent the PCI interrupts from being set up
353 * incorrectly, we try to use the ELCR. The sanity check to see if
354 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
355 * never be level sensitive, so we simply see if the ELCR agrees.
356 * If it does, we assume it's valid.
358 if (mpc_default_type == 5) {
359 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
361 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
362 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
364 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
369 for (i = 0; i < 16; i++) {
370 switch (mpc_default_type) {
372 if (i == 0 || i == 13)
373 continue; /* IRQ0 & IRQ13 not connected */
377 continue; /* IRQ2 is never connected */
382 * If the ELCR indicates a level-sensitive interrupt, we
383 * copy that information over to the MP table in the
384 * irqflag field (level sensitive, active high polarity).
387 intsrc.mpc_irqflag = 13;
389 intsrc.mpc_irqflag = 0;
392 intsrc.mpc_srcbusirq = i;
393 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
394 MP_intsrc_info(&intsrc);
397 intsrc.mpc_irqtype = mp_ExtINT;
398 intsrc.mpc_srcbusirq = 0;
399 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
400 MP_intsrc_info(&intsrc);
403 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
405 struct mpc_config_processor processor;
406 struct mpc_config_bus bus;
407 struct mpc_config_ioapic ioapic;
408 struct mpc_config_lintsrc lintsrc;
409 int linttypes[2] = { mp_ExtINT, mp_NMI };
413 * local APIC has default address
415 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
418 * 2 CPUs, numbered 0 & 1.
420 processor.mpc_type = MP_PROCESSOR;
421 processor.mpc_apicver = 0;
422 processor.mpc_cpuflag = CPU_ENABLED;
423 processor.mpc_cpufeature = 0;
424 processor.mpc_featureflag = 0;
425 processor.mpc_reserved[0] = 0;
426 processor.mpc_reserved[1] = 0;
427 for (i = 0; i < 2; i++) {
428 processor.mpc_apicid = i;
429 MP_processor_info(&processor);
432 bus.mpc_type = MP_BUS;
434 switch (mpc_default_type) {
436 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
441 memcpy(bus.mpc_bustype, "ISA ", 6);
445 if (mpc_default_type > 4) {
447 memcpy(bus.mpc_bustype, "PCI ", 6);
451 ioapic.mpc_type = MP_IOAPIC;
452 ioapic.mpc_apicid = 2;
453 ioapic.mpc_apicver = 0;
454 ioapic.mpc_flags = MPC_APIC_USABLE;
455 ioapic.mpc_apicaddr = 0xFEC00000;
456 MP_ioapic_info(&ioapic);
459 * We set up most of the low 16 IO-APIC pins according to MPS rules.
461 construct_default_ioirq_mptable(mpc_default_type);
463 lintsrc.mpc_type = MP_LINTSRC;
464 lintsrc.mpc_irqflag = 0; /* conforming */
465 lintsrc.mpc_srcbusid = 0;
466 lintsrc.mpc_srcbusirq = 0;
467 lintsrc.mpc_destapic = MP_APIC_ALL;
468 for (i = 0; i < 2; i++) {
469 lintsrc.mpc_irqtype = linttypes[i];
470 lintsrc.mpc_destapiclint = i;
471 MP_lintsrc_info(&lintsrc);
475 static struct intel_mp_floating *mpf_found;
478 * Scan the memory blocks for an SMP configuration block.
480 void __init get_smp_config (void)
482 struct intel_mp_floating *mpf = mpf_found;
485 * ACPI supports both logical (e.g. Hyper-Threading) and physical
486 * processors, where MPS only supports physical.
488 if (acpi_lapic && acpi_ioapic) {
489 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
493 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
495 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
498 * Now see if we need to read further.
500 if (mpf->mpf_feature1 != 0) {
502 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
503 construct_default_ISA_mptable(mpf->mpf_feature1);
505 } else if (mpf->mpf_physptr) {
508 * Read the physical hardware table. Anything here will
509 * override the defaults.
511 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
512 smp_found_config = 0;
513 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
514 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
518 * If there are no explicit MP IRQ entries, then we are
519 * broken. We set up most of the low 16 IO-APIC pins to
520 * ISA defaults and hope it will work.
522 if (!mp_irq_entries) {
523 struct mpc_config_bus bus;
525 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
527 bus.mpc_type = MP_BUS;
529 memcpy(bus.mpc_bustype, "ISA ", 6);
532 construct_default_ioirq_mptable(0);
538 printk(KERN_INFO "Processors: %d\n", num_processors);
540 * Only use the first configuration found.
544 static int __init smp_scan_config (unsigned long base, unsigned long length)
546 extern void __bad_mpf_size(void);
547 unsigned int *bp = phys_to_virt(base);
548 struct intel_mp_floating *mpf;
550 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
551 if (sizeof(*mpf) != 16)
555 mpf = (struct intel_mp_floating *)bp;
556 if ((*bp == SMP_MAGIC_IDENT) &&
557 (mpf->mpf_length == 1) &&
558 !mpf_checksum((unsigned char *)bp, 16) &&
559 ((mpf->mpf_specification == 1)
560 || (mpf->mpf_specification == 4)) ) {
562 smp_found_config = 1;
563 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
564 if (mpf->mpf_physptr)
565 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
575 void __init find_smp_config(void)
577 unsigned int address;
580 * FIXME: Linux assumes you have 640K of base ram..
581 * this continues the error...
583 * 1) Scan the bottom 1K for a signature
584 * 2) Scan the top 1K of base RAM
585 * 3) Scan the 64K of bios
587 if (smp_scan_config(0x0,0x400) ||
588 smp_scan_config(639*0x400,0x400) ||
589 smp_scan_config(0xF0000,0x10000))
592 * If it is an SMP machine we should know now.
594 * there is a real-mode segmented pointer pointing to the
595 * 4K EBDA area at 0x40E, calculate and scan it here.
597 * NOTE! There are Linux loaders that will corrupt the EBDA
598 * area, and as such this kind of SMP config may be less
599 * trustworthy, simply because the SMP table may have been
600 * stomped on during early boot. These loaders are buggy and
604 address = *(unsigned short *)phys_to_virt(0x40E);
606 if (smp_scan_config(address, 0x1000))
609 /* If we have come this far, we did not find an MP table */
610 printk(KERN_INFO "No mptable found.\n");
613 /* --------------------------------------------------------------------------
614 ACPI-based MP Configuration
615 -------------------------------------------------------------------------- */
619 void __init mp_register_lapic_address(u64 address)
621 mp_lapic_addr = (unsigned long) address;
622 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
623 if (boot_cpu_id == -1U)
624 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
627 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
629 struct mpc_config_processor processor;
632 if (id == boot_cpu_id)
635 processor.mpc_type = MP_PROCESSOR;
636 processor.mpc_apicid = id;
637 processor.mpc_apicver = 0;
638 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
639 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
640 processor.mpc_cpufeature = 0;
641 processor.mpc_featureflag = 0;
642 processor.mpc_reserved[0] = 0;
643 processor.mpc_reserved[1] = 0;
645 MP_processor_info(&processor);
649 #define MP_MAX_IOAPIC_PIN 127
651 static struct mp_ioapic_routing {
655 u32 pin_programmed[4];
656 } mp_ioapic_routing[MAX_IO_APICS];
658 static int mp_find_ioapic(int gsi)
662 /* Find the IOAPIC that manages this GSI. */
663 for (i = 0; i < nr_ioapics; i++) {
664 if ((gsi >= mp_ioapic_routing[i].gsi_start)
665 && (gsi <= mp_ioapic_routing[i].gsi_end))
669 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
673 static u8 uniq_ioapic_id(u8 id)
676 DECLARE_BITMAP(used, 256);
677 bitmap_zero(used, 256);
678 for (i = 0; i < nr_ioapics; i++) {
679 struct mpc_config_ioapic *ia = &mp_ioapics[i];
680 __set_bit(ia->mpc_apicid, used);
682 if (!test_bit(id, used))
684 return find_first_zero_bit(used, 256);
687 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
691 if (bad_ioapic(address))
696 mp_ioapics[idx].mpc_type = MP_IOAPIC;
697 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
698 mp_ioapics[idx].mpc_apicaddr = address;
700 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
701 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
702 mp_ioapics[idx].mpc_apicver = 0;
705 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
706 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
708 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
709 mp_ioapic_routing[idx].gsi_start = gsi_base;
710 mp_ioapic_routing[idx].gsi_end = gsi_base +
711 io_apic_get_redir_entries(idx);
713 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
714 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
715 mp_ioapics[idx].mpc_apicaddr,
716 mp_ioapic_routing[idx].gsi_start,
717 mp_ioapic_routing[idx].gsi_end);
723 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
725 struct mpc_config_intsrc intsrc;
730 * Convert 'gsi' to 'ioapic.pin'.
732 ioapic = mp_find_ioapic(gsi);
735 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
738 * TBD: This check is for faulty timer entries, where the override
739 * erroneously sets the trigger to level, resulting in a HUGE
740 * increase of timer interrupts!
742 if ((bus_irq == 0) && (trigger == 3))
745 intsrc.mpc_type = MP_INTSRC;
746 intsrc.mpc_irqtype = mp_INT;
747 intsrc.mpc_irqflag = (trigger << 2) | polarity;
748 intsrc.mpc_srcbus = MP_ISA_BUS;
749 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
750 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
751 intsrc.mpc_dstirq = pin; /* INTIN# */
753 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
754 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
755 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
756 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
758 mp_irqs[mp_irq_entries] = intsrc;
759 if (++mp_irq_entries == MAX_IRQ_SOURCES)
760 panic("Max # of irq sources exceeded!\n");
763 void __init mp_config_acpi_legacy_irqs(void)
765 struct mpc_config_intsrc intsrc;
770 * Fabricate the legacy ISA bus (bus #31).
772 set_bit(MP_ISA_BUS, mp_bus_not_pci);
775 * Locate the IOAPIC that manages the ISA IRQs (0-15).
777 ioapic = mp_find_ioapic(0);
781 intsrc.mpc_type = MP_INTSRC;
782 intsrc.mpc_irqflag = 0; /* Conforming */
783 intsrc.mpc_srcbus = MP_ISA_BUS;
784 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
787 * Use the default configuration for the IRQs 0-15. Unless
788 * overridden by (MADT) interrupt source override entries.
790 for (i = 0; i < 16; i++) {
793 for (idx = 0; idx < mp_irq_entries; idx++) {
794 struct mpc_config_intsrc *irq = mp_irqs + idx;
796 /* Do we already have a mapping for this ISA IRQ? */
797 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
800 /* Do we already have a mapping for this IOAPIC pin */
801 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
802 (irq->mpc_dstirq == i))
806 if (idx != mp_irq_entries) {
807 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
808 continue; /* IRQ already used */
811 intsrc.mpc_irqtype = mp_INT;
812 intsrc.mpc_srcbusirq = i; /* Identity mapped */
813 intsrc.mpc_dstirq = i;
815 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
816 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
817 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
818 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
821 mp_irqs[mp_irq_entries] = intsrc;
822 if (++mp_irq_entries == MAX_IRQ_SOURCES)
823 panic("Max # of irq sources exceeded!\n");
827 int mp_register_gsi(u32 gsi, int triggering, int polarity)
833 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
836 /* Don't set up the ACPI SCI because it's already set up */
837 if (acpi_gbl_FADT.sci_interrupt == gsi)
840 ioapic = mp_find_ioapic(gsi);
842 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
846 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
849 * Avoid pin reprogramming. PRTs typically include entries
850 * with redundant pin->gsi mappings (but unique PCI devices);
851 * we only program the IOAPIC on the first.
853 bit = ioapic_pin % 32;
854 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
856 printk(KERN_ERR "Invalid reference to IOAPIC pin "
857 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
861 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
862 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
863 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
867 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
869 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
870 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
871 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
874 #endif /*CONFIG_ACPI*/