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>
32 #include <asm/bios_ebda.h>
34 #include <mach_apic.h>
36 /* Have we found an MP table */
38 unsigned int __cpuinitdata maxcpus = NR_CPUS;
41 * Various Linux-internal data structures created from the
44 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
45 int mp_bus_id_to_pci_bus[MAX_MP_BUSSES] = {[0 ... MAX_MP_BUSSES - 1] = -1 };
47 static int mp_current_pci_id = 0;
48 /* I/O APIC entries */
49 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
51 /* # of MP IRQ source entries */
52 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
54 /* MP IRQ source entries */
58 unsigned long mp_lapic_addr = 0;
60 /* Processor that is doing the boot up */
61 unsigned int boot_cpu_physical_apicid = -1U;
62 EXPORT_SYMBOL(boot_cpu_physical_apicid);
64 /* Internal processor count */
65 unsigned int num_processors;
67 unsigned disabled_cpus __cpuinitdata;
69 /* Bitmask of physically existing CPUs */
70 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
72 u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
73 = {[0 ... NR_CPUS - 1] = BAD_APICID };
74 void *x86_bios_cpu_apicid_early_ptr;
75 DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
76 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_physical_apicid = 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(KERN_INFO "I/O APIC #%d at 0x%X.\n", m->mpc_apicid,
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);
227 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
230 int count = sizeof(*mpc);
231 unsigned char *mpt = ((unsigned char *)mpc) + count;
233 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
234 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
235 mpc->mpc_signature[0],
236 mpc->mpc_signature[1],
237 mpc->mpc_signature[2], mpc->mpc_signature[3]);
240 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
241 printk(KERN_ERR "MPTABLE: checksum error!\n");
244 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
245 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
249 if (!mpc->mpc_lapic) {
250 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
253 memcpy(str, mpc->mpc_oem, 8);
255 printk(KERN_INFO "MPTABLE: OEM ID: %s ", str);
257 memcpy(str, mpc->mpc_productid, 12);
259 printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
261 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
263 /* save the local APIC address, it might be non-default */
265 mp_lapic_addr = mpc->mpc_lapic;
271 * Now process the configuration blocks.
273 while (count < mpc->mpc_length) {
277 struct mpc_config_processor *m =
278 (struct mpc_config_processor *)mpt;
280 MP_processor_info(m);
287 struct mpc_config_bus *m =
288 (struct mpc_config_bus *)mpt;
296 struct mpc_config_ioapic *m =
297 (struct mpc_config_ioapic *)mpt;
305 struct mpc_config_intsrc *m =
306 (struct mpc_config_intsrc *)mpt;
315 struct mpc_config_lintsrc *m =
316 (struct mpc_config_lintsrc *)mpt;
324 setup_apic_routing();
326 printk(KERN_ERR "MPTABLE: no processors registered!\n");
327 return num_processors;
330 static int __init ELCR_trigger(unsigned int irq)
334 port = 0x4d0 + (irq >> 3);
335 return (inb(port) >> (irq & 7)) & 1;
338 static void __init construct_default_ioirq_mptable(int mpc_default_type)
340 struct mpc_config_intsrc intsrc;
342 int ELCR_fallback = 0;
344 intsrc.mpc_type = MP_INTSRC;
345 intsrc.mpc_irqflag = 0; /* conforming */
346 intsrc.mpc_srcbus = 0;
347 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
349 intsrc.mpc_irqtype = mp_INT;
352 * If true, we have an ISA/PCI system with no IRQ entries
353 * in the MP table. To prevent the PCI interrupts from being set up
354 * incorrectly, we try to use the ELCR. The sanity check to see if
355 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
356 * never be level sensitive, so we simply see if the ELCR agrees.
357 * If it does, we assume it's valid.
359 if (mpc_default_type == 5) {
360 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
361 "falling back to ELCR\n");
363 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
365 printk(KERN_ERR "ELCR contains invalid data... "
369 "Using ELCR to identify PCI interrupts\n");
374 for (i = 0; i < 16; i++) {
375 switch (mpc_default_type) {
377 if (i == 0 || i == 13)
378 continue; /* IRQ0 & IRQ13 not connected */
382 continue; /* IRQ2 is never connected */
387 * If the ELCR indicates a level-sensitive interrupt, we
388 * copy that information over to the MP table in the
389 * irqflag field (level sensitive, active high polarity).
392 intsrc.mpc_irqflag = 13;
394 intsrc.mpc_irqflag = 0;
397 intsrc.mpc_srcbusirq = i;
398 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
399 MP_intsrc_info(&intsrc);
402 intsrc.mpc_irqtype = mp_ExtINT;
403 intsrc.mpc_srcbusirq = 0;
404 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
405 MP_intsrc_info(&intsrc);
408 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
410 struct mpc_config_processor processor;
411 struct mpc_config_bus bus;
412 struct mpc_config_ioapic ioapic;
413 struct mpc_config_lintsrc lintsrc;
414 int linttypes[2] = { mp_ExtINT, mp_NMI };
418 * local APIC has default address
420 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
423 * 2 CPUs, numbered 0 & 1.
425 processor.mpc_type = MP_PROCESSOR;
426 processor.mpc_apicver = 0;
427 processor.mpc_cpuflag = CPU_ENABLED;
428 processor.mpc_cpufeature = 0;
429 processor.mpc_featureflag = 0;
430 processor.mpc_reserved[0] = 0;
431 processor.mpc_reserved[1] = 0;
432 for (i = 0; i < 2; i++) {
433 processor.mpc_apicid = i;
434 MP_processor_info(&processor);
437 bus.mpc_type = MP_BUS;
439 switch (mpc_default_type) {
441 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
446 memcpy(bus.mpc_bustype, "ISA ", 6);
450 if (mpc_default_type > 4) {
452 memcpy(bus.mpc_bustype, "PCI ", 6);
456 ioapic.mpc_type = MP_IOAPIC;
457 ioapic.mpc_apicid = 2;
458 ioapic.mpc_apicver = 0;
459 ioapic.mpc_flags = MPC_APIC_USABLE;
460 ioapic.mpc_apicaddr = 0xFEC00000;
461 MP_ioapic_info(&ioapic);
464 * We set up most of the low 16 IO-APIC pins according to MPS rules.
466 construct_default_ioirq_mptable(mpc_default_type);
468 lintsrc.mpc_type = MP_LINTSRC;
469 lintsrc.mpc_irqflag = 0; /* conforming */
470 lintsrc.mpc_srcbusid = 0;
471 lintsrc.mpc_srcbusirq = 0;
472 lintsrc.mpc_destapic = MP_APIC_ALL;
473 for (i = 0; i < 2; i++) {
474 lintsrc.mpc_irqtype = linttypes[i];
475 lintsrc.mpc_destapiclint = i;
476 MP_lintsrc_info(&lintsrc);
480 static struct intel_mp_floating *mpf_found;
483 * Scan the memory blocks for an SMP configuration block.
485 static void __init __get_smp_config(unsigned early)
487 struct intel_mp_floating *mpf = mpf_found;
489 if (acpi_lapic && early)
492 * ACPI supports both logical (e.g. Hyper-Threading) and physical
493 * processors, where MPS only supports physical.
495 if (acpi_lapic && acpi_ioapic) {
496 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
499 } else if (acpi_lapic)
500 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
501 "configuration information\n");
503 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
504 mpf->mpf_specification);
507 * Now see if we need to read further.
509 if (mpf->mpf_feature1 != 0) {
512 * local APIC has default address
514 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
518 printk(KERN_INFO "Default MP configuration #%d\n",
520 construct_default_ISA_mptable(mpf->mpf_feature1);
522 } else if (mpf->mpf_physptr) {
525 * Read the physical hardware table. Anything here will
526 * override the defaults.
528 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
529 smp_found_config = 0;
531 "BIOS bug, MP table errors detected!...\n");
532 printk(KERN_ERR "... disabling SMP support. "
533 "(tell your hw vendor)\n");
540 * If there are no explicit MP IRQ entries, then we are
541 * broken. We set up most of the low 16 IO-APIC pins to
542 * ISA defaults and hope it will work.
544 if (!mp_irq_entries) {
545 struct mpc_config_bus bus;
547 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
548 "using default mptable. "
549 "(tell your hw vendor)\n");
551 bus.mpc_type = MP_BUS;
553 memcpy(bus.mpc_bustype, "ISA ", 6);
556 construct_default_ioirq_mptable(0);
563 printk(KERN_INFO "Processors: %d\n", num_processors);
565 * Only use the first configuration found.
569 void __init early_get_smp_config(void)
574 void __init get_smp_config(void)
579 static int __init smp_scan_config(unsigned long base, unsigned long length,
582 extern void __bad_mpf_size(void);
583 unsigned int *bp = phys_to_virt(base);
584 struct intel_mp_floating *mpf;
586 Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
587 if (sizeof(*mpf) != 16)
591 mpf = (struct intel_mp_floating *)bp;
592 if ((*bp == SMP_MAGIC_IDENT) &&
593 (mpf->mpf_length == 1) &&
594 !mpf_checksum((unsigned char *)bp, 16) &&
595 ((mpf->mpf_specification == 1)
596 || (mpf->mpf_specification == 4))) {
598 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,
616 static void __init __find_smp_config(unsigned reserve)
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, reserve) ||
629 smp_scan_config(639 * 0x400, 0x400, reserve) ||
630 smp_scan_config(0xF0000, 0x10000, reserve))
633 * If it is an SMP machine we should know now.
635 * there is a real-mode segmented pointer pointing to the
636 * 4K EBDA area at 0x40E, calculate and scan it here.
638 * NOTE! There are Linux loaders that will corrupt the EBDA
639 * area, and as such this kind of SMP config may be less
640 * trustworthy, simply because the SMP table may have been
641 * stomped on during early boot. These loaders are buggy and
644 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
647 address = get_bios_ebda();
649 smp_scan_config(address, 0x400, reserve);
652 void __init early_find_smp_config(void)
654 __find_smp_config(0);
657 void __init find_smp_config(void)
659 __find_smp_config(1);
662 /* --------------------------------------------------------------------------
663 ACPI-based MP Configuration
664 -------------------------------------------------------------------------- */
668 void __init mp_register_lapic_address(u64 address)
670 mp_lapic_addr = (unsigned long)address;
671 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
672 if (boot_cpu_physical_apicid == -1U)
673 boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
676 void __cpuinit mp_register_lapic(u8 id, u8 enabled)
678 struct mpc_config_processor processor;
681 if (id == boot_cpu_physical_apicid)
684 processor.mpc_type = MP_PROCESSOR;
685 processor.mpc_apicid = id;
686 processor.mpc_apicver = 0;
687 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
688 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
689 processor.mpc_cpufeature = 0;
690 processor.mpc_featureflag = 0;
691 processor.mpc_reserved[0] = 0;
692 processor.mpc_reserved[1] = 0;
694 MP_processor_info(&processor);
698 #define MP_MAX_IOAPIC_PIN 127
700 static struct mp_ioapic_routing {
704 u32 pin_programmed[4];
705 } mp_ioapic_routing[MAX_IO_APICS];
707 static int mp_find_ioapic(int gsi)
711 /* Find the IOAPIC that manages this GSI. */
712 for (i = 0; i < nr_ioapics; i++) {
713 if ((gsi >= mp_ioapic_routing[i].gsi_start)
714 && (gsi <= mp_ioapic_routing[i].gsi_end))
718 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
722 static u8 uniq_ioapic_id(u8 id)
725 DECLARE_BITMAP(used, 256);
726 bitmap_zero(used, 256);
727 for (i = 0; i < nr_ioapics; i++) {
728 struct mpc_config_ioapic *ia = &mp_ioapics[i];
729 __set_bit(ia->mpc_apicid, used);
731 if (!test_bit(id, used))
733 return find_first_zero_bit(used, 256);
736 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
740 if (bad_ioapic(address))
745 mp_ioapics[idx].mpc_type = MP_IOAPIC;
746 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
747 mp_ioapics[idx].mpc_apicaddr = address;
749 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
750 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
751 mp_ioapics[idx].mpc_apicver = 0;
754 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
755 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
757 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
758 mp_ioapic_routing[idx].gsi_start = gsi_base;
759 mp_ioapic_routing[idx].gsi_end = gsi_base +
760 io_apic_get_redir_entries(idx);
762 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
763 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
764 mp_ioapics[idx].mpc_apicaddr,
765 mp_ioapic_routing[idx].gsi_start,
766 mp_ioapic_routing[idx].gsi_end);
771 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
773 struct mpc_config_intsrc intsrc;
778 * Convert 'gsi' to 'ioapic.pin'.
780 ioapic = mp_find_ioapic(gsi);
783 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
786 * TBD: This check is for faulty timer entries, where the override
787 * erroneously sets the trigger to level, resulting in a HUGE
788 * increase of timer interrupts!
790 if ((bus_irq == 0) && (trigger == 3))
793 intsrc.mpc_type = MP_INTSRC;
794 intsrc.mpc_irqtype = mp_INT;
795 intsrc.mpc_irqflag = (trigger << 2) | polarity;
796 intsrc.mpc_srcbus = MP_ISA_BUS;
797 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
798 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
799 intsrc.mpc_dstirq = pin; /* INTIN# */
801 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
802 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
803 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
804 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
806 mp_irqs[mp_irq_entries] = intsrc;
807 if (++mp_irq_entries == MAX_IRQ_SOURCES)
808 panic("Max # of irq sources exceeded!\n");
811 void __init mp_config_acpi_legacy_irqs(void)
813 struct mpc_config_intsrc intsrc;
818 * Fabricate the legacy ISA bus (bus #31).
820 set_bit(MP_ISA_BUS, mp_bus_not_pci);
823 * Locate the IOAPIC that manages the ISA IRQs (0-15).
825 ioapic = mp_find_ioapic(0);
829 intsrc.mpc_type = MP_INTSRC;
830 intsrc.mpc_irqflag = 0; /* Conforming */
831 intsrc.mpc_srcbus = MP_ISA_BUS;
832 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
835 * Use the default configuration for the IRQs 0-15. Unless
836 * overridden by (MADT) interrupt source override entries.
838 for (i = 0; i < 16; i++) {
841 for (idx = 0; idx < mp_irq_entries; idx++) {
842 struct mpc_config_intsrc *irq = mp_irqs + idx;
844 /* Do we already have a mapping for this ISA IRQ? */
845 if (irq->mpc_srcbus == MP_ISA_BUS
846 && irq->mpc_srcbusirq == i)
849 /* Do we already have a mapping for this IOAPIC pin */
850 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
851 (irq->mpc_dstirq == i))
855 if (idx != mp_irq_entries) {
856 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
857 continue; /* IRQ already used */
860 intsrc.mpc_irqtype = mp_INT;
861 intsrc.mpc_srcbusirq = i; /* Identity mapped */
862 intsrc.mpc_dstirq = i;
864 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
865 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
866 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
867 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
870 mp_irqs[mp_irq_entries] = intsrc;
871 if (++mp_irq_entries == MAX_IRQ_SOURCES)
872 panic("Max # of irq sources exceeded!\n");
876 int mp_register_gsi(u32 gsi, int triggering, int polarity)
882 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
885 /* Don't set up the ACPI SCI because it's already set up */
886 if (acpi_gbl_FADT.sci_interrupt == gsi)
889 ioapic = mp_find_ioapic(gsi);
891 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
895 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
898 * Avoid pin reprogramming. PRTs typically include entries
899 * with redundant pin->gsi mappings (but unique PCI devices);
900 * we only program the IOAPIC on the first.
902 bit = ioapic_pin % 32;
903 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
905 printk(KERN_ERR "Invalid reference to IOAPIC pin "
906 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
910 if ((1 << bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
911 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
912 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
916 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1 << bit);
918 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
919 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
920 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
923 #endif /* CONFIG_ACPI */