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);
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("MPTABLE: bad signature [%c%c%c%c]!\n",
235 mpc->mpc_signature[0],
236 mpc->mpc_signature[1],
237 mpc->mpc_signature[2],
238 mpc->mpc_signature[3]);
241 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
242 printk("MPTABLE: checksum error!\n");
245 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
246 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
250 if (!mpc->mpc_lapic) {
251 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
254 memcpy(str,mpc->mpc_oem,8);
256 printk(KERN_INFO "MPTABLE: OEM ID: %s ",str);
258 memcpy(str,mpc->mpc_productid,12);
260 printk("MPTABLE: Product ID: %s ",str);
262 printk("MPTABLE: APIC at: 0x%X\n",mpc->mpc_lapic);
264 /* save the local APIC address, it might be non-default */
266 mp_lapic_addr = mpc->mpc_lapic;
272 * Now process the configuration blocks.
274 while (count < mpc->mpc_length) {
278 struct mpc_config_processor *m=
279 (struct mpc_config_processor *)mpt;
281 MP_processor_info(m);
288 struct mpc_config_bus *m=
289 (struct mpc_config_bus *)mpt;
297 struct mpc_config_ioapic *m=
298 (struct mpc_config_ioapic *)mpt;
306 struct mpc_config_intsrc *m=
307 (struct mpc_config_intsrc *)mpt;
316 struct mpc_config_lintsrc *m=
317 (struct mpc_config_lintsrc *)mpt;
325 setup_apic_routing();
327 printk(KERN_ERR "MPTABLE: no processors registered!\n");
328 return num_processors;
331 static int __init ELCR_trigger(unsigned int irq)
335 port = 0x4d0 + (irq >> 3);
336 return (inb(port) >> (irq & 7)) & 1;
339 static void __init construct_default_ioirq_mptable(int mpc_default_type)
341 struct mpc_config_intsrc intsrc;
343 int ELCR_fallback = 0;
345 intsrc.mpc_type = MP_INTSRC;
346 intsrc.mpc_irqflag = 0; /* conforming */
347 intsrc.mpc_srcbus = 0;
348 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
350 intsrc.mpc_irqtype = mp_INT;
353 * If true, we have an ISA/PCI system with no IRQ entries
354 * in the MP table. To prevent the PCI interrupts from being set up
355 * incorrectly, we try to use the ELCR. The sanity check to see if
356 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
357 * never be level sensitive, so we simply see if the ELCR agrees.
358 * If it does, we assume it's valid.
360 if (mpc_default_type == 5) {
361 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
363 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
364 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
366 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
371 for (i = 0; i < 16; i++) {
372 switch (mpc_default_type) {
374 if (i == 0 || i == 13)
375 continue; /* IRQ0 & IRQ13 not connected */
379 continue; /* IRQ2 is never connected */
384 * If the ELCR indicates a level-sensitive interrupt, we
385 * copy that information over to the MP table in the
386 * irqflag field (level sensitive, active high polarity).
389 intsrc.mpc_irqflag = 13;
391 intsrc.mpc_irqflag = 0;
394 intsrc.mpc_srcbusirq = i;
395 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
396 MP_intsrc_info(&intsrc);
399 intsrc.mpc_irqtype = mp_ExtINT;
400 intsrc.mpc_srcbusirq = 0;
401 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
402 MP_intsrc_info(&intsrc);
405 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
407 struct mpc_config_processor processor;
408 struct mpc_config_bus bus;
409 struct mpc_config_ioapic ioapic;
410 struct mpc_config_lintsrc lintsrc;
411 int linttypes[2] = { mp_ExtINT, mp_NMI };
415 * local APIC has default address
417 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
420 * 2 CPUs, numbered 0 & 1.
422 processor.mpc_type = MP_PROCESSOR;
423 processor.mpc_apicver = 0;
424 processor.mpc_cpuflag = CPU_ENABLED;
425 processor.mpc_cpufeature = 0;
426 processor.mpc_featureflag = 0;
427 processor.mpc_reserved[0] = 0;
428 processor.mpc_reserved[1] = 0;
429 for (i = 0; i < 2; i++) {
430 processor.mpc_apicid = i;
431 MP_processor_info(&processor);
434 bus.mpc_type = MP_BUS;
436 switch (mpc_default_type) {
438 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
443 memcpy(bus.mpc_bustype, "ISA ", 6);
447 if (mpc_default_type > 4) {
449 memcpy(bus.mpc_bustype, "PCI ", 6);
453 ioapic.mpc_type = MP_IOAPIC;
454 ioapic.mpc_apicid = 2;
455 ioapic.mpc_apicver = 0;
456 ioapic.mpc_flags = MPC_APIC_USABLE;
457 ioapic.mpc_apicaddr = 0xFEC00000;
458 MP_ioapic_info(&ioapic);
461 * We set up most of the low 16 IO-APIC pins according to MPS rules.
463 construct_default_ioirq_mptable(mpc_default_type);
465 lintsrc.mpc_type = MP_LINTSRC;
466 lintsrc.mpc_irqflag = 0; /* conforming */
467 lintsrc.mpc_srcbusid = 0;
468 lintsrc.mpc_srcbusirq = 0;
469 lintsrc.mpc_destapic = MP_APIC_ALL;
470 for (i = 0; i < 2; i++) {
471 lintsrc.mpc_irqtype = linttypes[i];
472 lintsrc.mpc_destapiclint = i;
473 MP_lintsrc_info(&lintsrc);
477 static struct intel_mp_floating *mpf_found;
480 * Scan the memory blocks for an SMP configuration block.
482 static void __init __get_smp_config(unsigned early)
484 struct intel_mp_floating *mpf = mpf_found;
486 if (acpi_lapic && early)
489 * ACPI supports both logical (e.g. Hyper-Threading) and physical
490 * processors, where MPS only supports physical.
492 if (acpi_lapic && acpi_ioapic) {
493 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
496 } else if (acpi_lapic)
497 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
498 "configuration information\n");
500 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
501 mpf->mpf_specification);
504 * Now see if we need to read further.
506 if (mpf->mpf_feature1 != 0) {
509 * local APIC has default address
511 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
515 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
516 construct_default_ISA_mptable(mpf->mpf_feature1);
518 } else if (mpf->mpf_physptr) {
521 * Read the physical hardware table. Anything here will
522 * override the defaults.
524 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
525 smp_found_config = 0;
526 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
527 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
534 * If there are no explicit MP IRQ entries, then we are
535 * broken. We set up most of the low 16 IO-APIC pins to
536 * ISA defaults and hope it will work.
538 if (!mp_irq_entries) {
539 struct mpc_config_bus bus;
541 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
543 bus.mpc_type = MP_BUS;
545 memcpy(bus.mpc_bustype, "ISA ", 6);
548 construct_default_ioirq_mptable(0);
555 printk(KERN_INFO "Processors: %d\n", num_processors);
557 * Only use the first configuration found.
561 void __init early_get_smp_config(void)
566 void __init get_smp_config(void)
571 static int __init smp_scan_config(unsigned long base, unsigned long length,
574 extern void __bad_mpf_size(void);
575 unsigned int *bp = phys_to_virt(base);
576 struct intel_mp_floating *mpf;
578 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
579 if (sizeof(*mpf) != 16)
583 mpf = (struct intel_mp_floating *)bp;
584 if ((*bp == SMP_MAGIC_IDENT) &&
585 (mpf->mpf_length == 1) &&
586 !mpf_checksum((unsigned char *)bp, 16) &&
587 ((mpf->mpf_specification == 1)
588 || (mpf->mpf_specification == 4)) ) {
590 smp_found_config = 1;
596 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
597 if (mpf->mpf_physptr)
598 reserve_bootmem_generic(mpf->mpf_physptr,
608 static void __init __find_smp_config(unsigned reserve)
610 unsigned int address;
613 * FIXME: Linux assumes you have 640K of base ram..
614 * this continues the error...
616 * 1) Scan the bottom 1K for a signature
617 * 2) Scan the top 1K of base RAM
618 * 3) Scan the 64K of bios
620 if (smp_scan_config(0x0, 0x400, reserve) ||
621 smp_scan_config(639*0x400, 0x400, reserve) ||
622 smp_scan_config(0xF0000, 0x10000, reserve))
625 * If it is an SMP machine we should know now.
627 * there is a real-mode segmented pointer pointing to the
628 * 4K EBDA area at 0x40E, calculate and scan it here.
630 * NOTE! There are Linux loaders that will corrupt the EBDA
631 * area, and as such this kind of SMP config may be less
632 * trustworthy, simply because the SMP table may have been
633 * stomped on during early boot. These loaders are buggy and
637 address = *(unsigned short *)phys_to_virt(0x40E);
639 if (smp_scan_config(address, 0x1000, reserve))
642 /* If we have come this far, we did not find an MP table */
643 printk(KERN_INFO "No mptable found.\n");
646 void __init early_find_smp_config(void)
648 __find_smp_config(0);
651 void __init find_smp_config(void)
653 __find_smp_config(1);
656 /* --------------------------------------------------------------------------
657 ACPI-based MP Configuration
658 -------------------------------------------------------------------------- */
662 void __init mp_register_lapic_address(u64 address)
664 mp_lapic_addr = (unsigned long) address;
665 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
666 if (boot_cpu_id == -1U)
667 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
670 void __cpuinit mp_register_lapic (u8 id, u8 enabled)
672 struct mpc_config_processor processor;
675 if (id == boot_cpu_id)
678 processor.mpc_type = MP_PROCESSOR;
679 processor.mpc_apicid = id;
680 processor.mpc_apicver = 0;
681 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
682 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
683 processor.mpc_cpufeature = 0;
684 processor.mpc_featureflag = 0;
685 processor.mpc_reserved[0] = 0;
686 processor.mpc_reserved[1] = 0;
688 MP_processor_info(&processor);
692 #define MP_MAX_IOAPIC_PIN 127
694 static struct mp_ioapic_routing {
698 u32 pin_programmed[4];
699 } mp_ioapic_routing[MAX_IO_APICS];
701 static int mp_find_ioapic(int gsi)
705 /* Find the IOAPIC that manages this GSI. */
706 for (i = 0; i < nr_ioapics; i++) {
707 if ((gsi >= mp_ioapic_routing[i].gsi_start)
708 && (gsi <= mp_ioapic_routing[i].gsi_end))
712 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
716 static u8 uniq_ioapic_id(u8 id)
719 DECLARE_BITMAP(used, 256);
720 bitmap_zero(used, 256);
721 for (i = 0; i < nr_ioapics; i++) {
722 struct mpc_config_ioapic *ia = &mp_ioapics[i];
723 __set_bit(ia->mpc_apicid, used);
725 if (!test_bit(id, used))
727 return find_first_zero_bit(used, 256);
730 void __init mp_register_ioapic(u8 id, u32 address, u32 gsi_base)
734 if (bad_ioapic(address))
739 mp_ioapics[idx].mpc_type = MP_IOAPIC;
740 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
741 mp_ioapics[idx].mpc_apicaddr = address;
743 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
744 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
745 mp_ioapics[idx].mpc_apicver = 0;
748 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
749 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
751 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
752 mp_ioapic_routing[idx].gsi_start = gsi_base;
753 mp_ioapic_routing[idx].gsi_end = gsi_base +
754 io_apic_get_redir_entries(idx);
756 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, address 0x%x, "
757 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
758 mp_ioapics[idx].mpc_apicaddr,
759 mp_ioapic_routing[idx].gsi_start,
760 mp_ioapic_routing[idx].gsi_end);
766 mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
768 struct mpc_config_intsrc intsrc;
773 * Convert 'gsi' to 'ioapic.pin'.
775 ioapic = mp_find_ioapic(gsi);
778 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
781 * TBD: This check is for faulty timer entries, where the override
782 * erroneously sets the trigger to level, resulting in a HUGE
783 * increase of timer interrupts!
785 if ((bus_irq == 0) && (trigger == 3))
788 intsrc.mpc_type = MP_INTSRC;
789 intsrc.mpc_irqtype = mp_INT;
790 intsrc.mpc_irqflag = (trigger << 2) | polarity;
791 intsrc.mpc_srcbus = MP_ISA_BUS;
792 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
793 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
794 intsrc.mpc_dstirq = pin; /* INTIN# */
796 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
797 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
798 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
799 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
801 mp_irqs[mp_irq_entries] = intsrc;
802 if (++mp_irq_entries == MAX_IRQ_SOURCES)
803 panic("Max # of irq sources exceeded!\n");
806 void __init mp_config_acpi_legacy_irqs(void)
808 struct mpc_config_intsrc intsrc;
813 * Fabricate the legacy ISA bus (bus #31).
815 set_bit(MP_ISA_BUS, mp_bus_not_pci);
818 * Locate the IOAPIC that manages the ISA IRQs (0-15).
820 ioapic = mp_find_ioapic(0);
824 intsrc.mpc_type = MP_INTSRC;
825 intsrc.mpc_irqflag = 0; /* Conforming */
826 intsrc.mpc_srcbus = MP_ISA_BUS;
827 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
830 * Use the default configuration for the IRQs 0-15. Unless
831 * overridden by (MADT) interrupt source override entries.
833 for (i = 0; i < 16; i++) {
836 for (idx = 0; idx < mp_irq_entries; idx++) {
837 struct mpc_config_intsrc *irq = mp_irqs + idx;
839 /* Do we already have a mapping for this ISA IRQ? */
840 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
843 /* Do we already have a mapping for this IOAPIC pin */
844 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
845 (irq->mpc_dstirq == i))
849 if (idx != mp_irq_entries) {
850 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
851 continue; /* IRQ already used */
854 intsrc.mpc_irqtype = mp_INT;
855 intsrc.mpc_srcbusirq = i; /* Identity mapped */
856 intsrc.mpc_dstirq = i;
858 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
859 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
860 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
861 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
864 mp_irqs[mp_irq_entries] = intsrc;
865 if (++mp_irq_entries == MAX_IRQ_SOURCES)
866 panic("Max # of irq sources exceeded!\n");
870 int mp_register_gsi(u32 gsi, int triggering, int polarity)
876 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
879 /* Don't set up the ACPI SCI because it's already set up */
880 if (acpi_gbl_FADT.sci_interrupt == gsi)
883 ioapic = mp_find_ioapic(gsi);
885 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
889 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
892 * Avoid pin reprogramming. PRTs typically include entries
893 * with redundant pin->gsi mappings (but unique PCI devices);
894 * we only program the IOAPIC on the first.
896 bit = ioapic_pin % 32;
897 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
899 printk(KERN_ERR "Invalid reference to IOAPIC pin "
900 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
904 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
905 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
906 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
910 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
912 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
913 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
914 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
917 #endif /*CONFIG_ACPI*/