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/config.h>
20 #include <linux/bootmem.h>
21 #include <linux/smp_lock.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/acpi.h>
25 #include <linux/module.h>
29 #include <asm/mpspec.h>
30 #include <asm/pgalloc.h>
31 #include <asm/io_apic.h>
32 #include <asm/proto.h>
35 /* Have we found an MP table */
37 unsigned int __initdata maxcpus = NR_CPUS;
42 * Various Linux-internal data structures created from the
45 unsigned char apic_version [MAX_APICS];
46 unsigned char mp_bus_id_to_type [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
47 int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
49 static int mp_current_pci_id = 0;
50 /* I/O APIC entries */
51 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
53 /* # of MP IRQ source entries */
54 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
56 /* MP IRQ source entries */
61 unsigned long mp_lapic_addr = 0;
65 /* Processor that is doing the boot up */
66 unsigned int boot_cpu_id = -1U;
67 /* Internal processor count */
68 unsigned int num_processors __initdata = 0;
70 unsigned disabled_cpus __initdata;
72 /* Bitmask of physically existing CPUs */
73 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
75 /* ACPI MADT entry parsing functions */
77 extern struct acpi_boot_flags acpi_boot;
78 #ifdef CONFIG_X86_LOCAL_APIC
79 extern int acpi_parse_lapic (acpi_table_entry_header *header);
80 extern int acpi_parse_lapic_addr_ovr (acpi_table_entry_header *header);
81 extern int acpi_parse_lapic_nmi (acpi_table_entry_header *header);
82 #endif /*CONFIG_X86_LOCAL_APIC*/
83 #ifdef CONFIG_X86_IO_APIC
84 extern int acpi_parse_ioapic (acpi_table_entry_header *header);
85 #endif /*CONFIG_X86_IO_APIC*/
86 #endif /*CONFIG_ACPI*/
88 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
92 * Intel MP BIOS table parsing routines:
96 * Checksum an MP configuration block.
99 static int __init mpf_checksum(unsigned char *mp, int len)
109 static void __cpuinit MP_processor_info (struct mpc_config_processor *m)
115 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
120 printk(KERN_INFO "Processor #%d %d:%d APIC version %d\n",
122 (m->mpc_cpufeature & CPU_FAMILY_MASK)>>8,
123 (m->mpc_cpufeature & CPU_MODEL_MASK)>>4,
126 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
127 Dprintk(" Bootup CPU\n");
128 boot_cpu_id = m->mpc_apicid;
130 if (num_processors >= NR_CPUS) {
131 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
132 " Processor ignored.\n", NR_CPUS);
137 cpus_complement(tmp_map, cpu_present_map);
138 cpu = first_cpu(tmp_map);
141 if ((int)m->mpc_apicid > MAX_APICS) {
142 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
143 m->mpc_apicid, MAX_APICS);
147 ver = m->mpc_apicver;
149 physid_set(m->mpc_apicid, phys_cpu_present_map);
154 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
157 apic_version[m->mpc_apicid] = ver;
158 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
160 * bios_cpu_apicid is required to have processors listed
161 * in same order as logical cpu numbers. Hence the first
162 * entry is BSP, and so on.
166 bios_cpu_apicid[cpu] = m->mpc_apicid;
167 x86_cpu_to_apicid[cpu] = m->mpc_apicid;
169 cpu_set(cpu, cpu_possible_map);
170 cpu_set(cpu, cpu_present_map);
173 static void __init MP_bus_info (struct mpc_config_bus *m)
177 memcpy(str, m->mpc_bustype, 6);
179 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
181 if (strncmp(str, "ISA", 3) == 0) {
182 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
183 } else if (strncmp(str, "EISA", 4) == 0) {
184 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
185 } else if (strncmp(str, "PCI", 3) == 0) {
186 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
187 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
189 } else if (strncmp(str, "MCA", 3) == 0) {
190 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
192 printk(KERN_ERR "Unknown bustype %s\n", str);
196 static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
198 if (!(m->mpc_flags & MPC_APIC_USABLE))
201 printk("I/O APIC #%d Version %d at 0x%X.\n",
202 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
203 if (nr_ioapics >= MAX_IO_APICS) {
204 printk(KERN_ERR "Max # of I/O APICs (%d) exceeded (found %d).\n",
205 MAX_IO_APICS, nr_ioapics);
206 panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
208 if (!m->mpc_apicaddr) {
209 printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
210 " found in MP table, skipping!\n");
213 mp_ioapics[nr_ioapics] = *m;
217 static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
219 mp_irqs [mp_irq_entries] = *m;
220 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
221 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
222 m->mpc_irqtype, m->mpc_irqflag & 3,
223 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
224 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
225 if (++mp_irq_entries >= MAX_IRQ_SOURCES)
226 panic("Max # of irq sources exceeded!!\n");
229 static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
231 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
232 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
233 m->mpc_irqtype, m->mpc_irqflag & 3,
234 (m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
235 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
237 * Well it seems all SMP boards in existence
238 * use ExtINT/LVT1 == LINT0 and
239 * NMI/LVT2 == LINT1 - the following check
240 * will show us if this assumptions is false.
241 * Until then we do not have to add baggage.
243 if ((m->mpc_irqtype == mp_ExtINT) &&
244 (m->mpc_destapiclint != 0))
246 if ((m->mpc_irqtype == mp_NMI) &&
247 (m->mpc_destapiclint != 1))
255 static int __init smp_read_mpc(struct mp_config_table *mpc)
258 int count=sizeof(*mpc);
259 unsigned char *mpt=((unsigned char *)mpc)+count;
261 if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
262 printk("SMP mptable: bad signature [%c%c%c%c]!\n",
263 mpc->mpc_signature[0],
264 mpc->mpc_signature[1],
265 mpc->mpc_signature[2],
266 mpc->mpc_signature[3]);
269 if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
270 printk("SMP mptable: checksum error!\n");
273 if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
274 printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
278 if (!mpc->mpc_lapic) {
279 printk(KERN_ERR "SMP mptable: null local APIC address!\n");
282 memcpy(str,mpc->mpc_oem,8);
284 printk(KERN_INFO "OEM ID: %s ",str);
286 memcpy(str,mpc->mpc_productid,12);
288 printk("Product ID: %s ",str);
290 printk("APIC at: 0x%X\n",mpc->mpc_lapic);
292 /* save the local APIC address, it might be non-default */
294 mp_lapic_addr = mpc->mpc_lapic;
297 * Now process the configuration blocks.
299 while (count < mpc->mpc_length) {
303 struct mpc_config_processor *m=
304 (struct mpc_config_processor *)mpt;
306 MP_processor_info(m);
313 struct mpc_config_bus *m=
314 (struct mpc_config_bus *)mpt;
322 struct mpc_config_ioapic *m=
323 (struct mpc_config_ioapic *)mpt;
331 struct mpc_config_intsrc *m=
332 (struct mpc_config_intsrc *)mpt;
341 struct mpc_config_lintsrc *m=
342 (struct mpc_config_lintsrc *)mpt;
350 clustered_apic_check();
352 printk(KERN_ERR "SMP mptable: no processors registered!\n");
353 return num_processors;
356 static int __init ELCR_trigger(unsigned int irq)
360 port = 0x4d0 + (irq >> 3);
361 return (inb(port) >> (irq & 7)) & 1;
364 static void __init construct_default_ioirq_mptable(int mpc_default_type)
366 struct mpc_config_intsrc intsrc;
368 int ELCR_fallback = 0;
370 intsrc.mpc_type = MP_INTSRC;
371 intsrc.mpc_irqflag = 0; /* conforming */
372 intsrc.mpc_srcbus = 0;
373 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
375 intsrc.mpc_irqtype = mp_INT;
378 * If true, we have an ISA/PCI system with no IRQ entries
379 * in the MP table. To prevent the PCI interrupts from being set up
380 * incorrectly, we try to use the ELCR. The sanity check to see if
381 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
382 * never be level sensitive, so we simply see if the ELCR agrees.
383 * If it does, we assume it's valid.
385 if (mpc_default_type == 5) {
386 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
388 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
389 printk(KERN_ERR "ELCR contains invalid data... not using ELCR\n");
391 printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
396 for (i = 0; i < 16; i++) {
397 switch (mpc_default_type) {
399 if (i == 0 || i == 13)
400 continue; /* IRQ0 & IRQ13 not connected */
404 continue; /* IRQ2 is never connected */
409 * If the ELCR indicates a level-sensitive interrupt, we
410 * copy that information over to the MP table in the
411 * irqflag field (level sensitive, active high polarity).
414 intsrc.mpc_irqflag = 13;
416 intsrc.mpc_irqflag = 0;
419 intsrc.mpc_srcbusirq = i;
420 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
421 MP_intsrc_info(&intsrc);
424 intsrc.mpc_irqtype = mp_ExtINT;
425 intsrc.mpc_srcbusirq = 0;
426 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
427 MP_intsrc_info(&intsrc);
430 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
432 struct mpc_config_processor processor;
433 struct mpc_config_bus bus;
434 struct mpc_config_ioapic ioapic;
435 struct mpc_config_lintsrc lintsrc;
436 int linttypes[2] = { mp_ExtINT, mp_NMI };
440 * local APIC has default address
442 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
445 * 2 CPUs, numbered 0 & 1.
447 processor.mpc_type = MP_PROCESSOR;
448 /* Either an integrated APIC or a discrete 82489DX. */
449 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
450 processor.mpc_cpuflag = CPU_ENABLED;
451 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
452 (boot_cpu_data.x86_model << 4) |
453 boot_cpu_data.x86_mask;
454 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
455 processor.mpc_reserved[0] = 0;
456 processor.mpc_reserved[1] = 0;
457 for (i = 0; i < 2; i++) {
458 processor.mpc_apicid = i;
459 MP_processor_info(&processor);
462 bus.mpc_type = MP_BUS;
464 switch (mpc_default_type) {
466 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
471 memcpy(bus.mpc_bustype, "ISA ", 6);
476 memcpy(bus.mpc_bustype, "EISA ", 6);
480 memcpy(bus.mpc_bustype, "MCA ", 6);
483 if (mpc_default_type > 4) {
485 memcpy(bus.mpc_bustype, "PCI ", 6);
489 ioapic.mpc_type = MP_IOAPIC;
490 ioapic.mpc_apicid = 2;
491 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
492 ioapic.mpc_flags = MPC_APIC_USABLE;
493 ioapic.mpc_apicaddr = 0xFEC00000;
494 MP_ioapic_info(&ioapic);
497 * We set up most of the low 16 IO-APIC pins according to MPS rules.
499 construct_default_ioirq_mptable(mpc_default_type);
501 lintsrc.mpc_type = MP_LINTSRC;
502 lintsrc.mpc_irqflag = 0; /* conforming */
503 lintsrc.mpc_srcbusid = 0;
504 lintsrc.mpc_srcbusirq = 0;
505 lintsrc.mpc_destapic = MP_APIC_ALL;
506 for (i = 0; i < 2; i++) {
507 lintsrc.mpc_irqtype = linttypes[i];
508 lintsrc.mpc_destapiclint = i;
509 MP_lintsrc_info(&lintsrc);
513 static struct intel_mp_floating *mpf_found;
516 * Scan the memory blocks for an SMP configuration block.
518 void __init get_smp_config (void)
520 struct intel_mp_floating *mpf = mpf_found;
523 * ACPI supports both logical (e.g. Hyper-Threading) and physical
524 * processors, where MPS only supports physical.
526 if (acpi_lapic && acpi_ioapic) {
527 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
531 printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
533 printk("Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
534 if (mpf->mpf_feature2 & (1<<7)) {
535 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
538 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
543 * Now see if we need to read further.
545 if (mpf->mpf_feature1 != 0) {
547 printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
548 construct_default_ISA_mptable(mpf->mpf_feature1);
550 } else if (mpf->mpf_physptr) {
553 * Read the physical hardware table. Anything here will
554 * override the defaults.
556 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr))) {
557 smp_found_config = 0;
558 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
559 printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
563 * If there are no explicit MP IRQ entries, then we are
564 * broken. We set up most of the low 16 IO-APIC pins to
565 * ISA defaults and hope it will work.
567 if (!mp_irq_entries) {
568 struct mpc_config_bus bus;
570 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
572 bus.mpc_type = MP_BUS;
574 memcpy(bus.mpc_bustype, "ISA ", 6);
577 construct_default_ioirq_mptable(0);
583 printk(KERN_INFO "Processors: %d\n", num_processors);
585 * Only use the first configuration found.
589 static int __init smp_scan_config (unsigned long base, unsigned long length)
591 extern void __bad_mpf_size(void);
592 unsigned int *bp = phys_to_virt(base);
593 struct intel_mp_floating *mpf;
595 Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
596 if (sizeof(*mpf) != 16)
600 mpf = (struct intel_mp_floating *)bp;
601 if ((*bp == SMP_MAGIC_IDENT) &&
602 (mpf->mpf_length == 1) &&
603 !mpf_checksum((unsigned char *)bp, 16) &&
604 ((mpf->mpf_specification == 1)
605 || (mpf->mpf_specification == 4)) ) {
607 smp_found_config = 1;
608 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
609 if (mpf->mpf_physptr)
610 reserve_bootmem_generic(mpf->mpf_physptr, PAGE_SIZE);
620 void __init find_intel_smp (void)
622 unsigned int address;
625 * FIXME: Linux assumes you have 640K of base ram..
626 * this continues the error...
628 * 1) Scan the bottom 1K for a signature
629 * 2) Scan the top 1K of base RAM
630 * 3) Scan the 64K of bios
632 if (smp_scan_config(0x0,0x400) ||
633 smp_scan_config(639*0x400,0x400) ||
634 smp_scan_config(0xF0000,0x10000))
637 * If it is an SMP machine we should know now, unless the
638 * configuration is in an EISA/MCA bus machine with an
639 * extended bios data area.
641 * there is a real-mode segmented pointer pointing to the
642 * 4K EBDA area at 0x40E, calculate and scan it here.
644 * NOTE! There are Linux loaders that will corrupt the EBDA
645 * area, and as such this kind of SMP config may be less
646 * trustworthy, simply because the SMP table may have been
647 * stomped on during early boot. These loaders are buggy and
651 address = *(unsigned short *)phys_to_virt(0x40E);
653 if (smp_scan_config(address, 0x1000))
656 /* If we have come this far, we did not find an MP table */
657 printk(KERN_INFO "No mptable found.\n");
661 * - Intel MP Configuration Table
663 void __init find_smp_config (void)
665 #ifdef CONFIG_X86_LOCAL_APIC
671 /* --------------------------------------------------------------------------
672 ACPI-based MP Configuration
673 -------------------------------------------------------------------------- */
677 void __init mp_register_lapic_address (
680 mp_lapic_addr = (unsigned long) address;
682 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
684 if (boot_cpu_id == -1U)
685 boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
687 Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
691 void __cpuinit mp_register_lapic (
695 struct mpc_config_processor processor;
698 if (id >= MAX_APICS) {
699 printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
704 if (id == boot_cpu_physical_apicid)
707 processor.mpc_type = MP_PROCESSOR;
708 processor.mpc_apicid = id;
709 processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
710 processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
711 processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
712 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
713 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
714 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
715 processor.mpc_reserved[0] = 0;
716 processor.mpc_reserved[1] = 0;
718 MP_processor_info(&processor);
721 #ifdef CONFIG_X86_IO_APIC
724 #define MP_MAX_IOAPIC_PIN 127
726 static struct mp_ioapic_routing {
730 u32 pin_programmed[4];
731 } mp_ioapic_routing[MAX_IO_APICS];
734 static int mp_find_ioapic (
739 /* Find the IOAPIC that manages this GSI. */
740 for (i = 0; i < nr_ioapics; i++) {
741 if ((gsi >= mp_ioapic_routing[i].gsi_start)
742 && (gsi <= mp_ioapic_routing[i].gsi_end))
746 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
752 void __init mp_register_ioapic (
759 if (nr_ioapics >= MAX_IO_APICS) {
760 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
761 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
762 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
765 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
766 " found in MADT table, skipping!\n");
772 mp_ioapics[idx].mpc_type = MP_IOAPIC;
773 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
774 mp_ioapics[idx].mpc_apicaddr = address;
776 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
777 mp_ioapics[idx].mpc_apicid = id;
778 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
781 * Build basic IRQ lookup table to facilitate gsi->io_apic lookups
782 * and to prevent reprogramming of IOAPIC pins (PCI IRQs).
784 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
785 mp_ioapic_routing[idx].gsi_start = gsi_base;
786 mp_ioapic_routing[idx].gsi_end = gsi_base +
787 io_apic_get_redir_entries(idx);
789 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
790 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
791 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
792 mp_ioapic_routing[idx].gsi_start,
793 mp_ioapic_routing[idx].gsi_end);
799 void __init mp_override_legacy_irq (
805 struct mpc_config_intsrc intsrc;
810 * Convert 'gsi' to 'ioapic.pin'.
812 ioapic = mp_find_ioapic(gsi);
815 pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
818 * TBD: This check is for faulty timer entries, where the override
819 * erroneously sets the trigger to level, resulting in a HUGE
820 * increase of timer interrupts!
822 if ((bus_irq == 0) && (trigger == 3))
825 intsrc.mpc_type = MP_INTSRC;
826 intsrc.mpc_irqtype = mp_INT;
827 intsrc.mpc_irqflag = (trigger << 2) | polarity;
828 intsrc.mpc_srcbus = MP_ISA_BUS;
829 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
830 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
831 intsrc.mpc_dstirq = pin; /* INTIN# */
833 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
834 intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
835 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
836 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
838 mp_irqs[mp_irq_entries] = intsrc;
839 if (++mp_irq_entries == MAX_IRQ_SOURCES)
840 panic("Max # of irq sources exceeded!\n");
846 void __init mp_config_acpi_legacy_irqs (void)
848 struct mpc_config_intsrc intsrc;
853 * Fabricate the legacy ISA bus (bus #31).
855 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
856 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
859 * Locate the IOAPIC that manages the ISA IRQs (0-15).
861 ioapic = mp_find_ioapic(0);
865 intsrc.mpc_type = MP_INTSRC;
866 intsrc.mpc_irqflag = 0; /* Conforming */
867 intsrc.mpc_srcbus = MP_ISA_BUS;
868 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
871 * Use the default configuration for the IRQs 0-15. Unless
872 * overridden by (MADT) interrupt source override entries.
874 for (i = 0; i < 16; i++) {
877 for (idx = 0; idx < mp_irq_entries; idx++) {
878 struct mpc_config_intsrc *irq = mp_irqs + idx;
880 /* Do we already have a mapping for this ISA IRQ? */
881 if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
884 /* Do we already have a mapping for this IOAPIC pin */
885 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
886 (irq->mpc_dstirq == i))
890 if (idx != mp_irq_entries) {
891 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
892 continue; /* IRQ already used */
895 intsrc.mpc_irqtype = mp_INT;
896 intsrc.mpc_srcbusirq = i; /* Identity mapped */
897 intsrc.mpc_dstirq = i;
899 Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
900 "%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
901 (intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
902 intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
905 mp_irqs[mp_irq_entries] = intsrc;
906 if (++mp_irq_entries == MAX_IRQ_SOURCES)
907 panic("Max # of irq sources exceeded!\n");
913 #define MAX_GSI_NUM 4096
915 int mp_register_gsi(u32 gsi, int triggering, int polarity)
920 static int pci_irq = 16;
922 * Mapping between Global System Interrupts, which
923 * represent all possible interrupts, to the IRQs
924 * assigned to actual devices.
926 static int gsi_to_irq[MAX_GSI_NUM];
928 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
931 /* Don't set up the ACPI SCI because it's already set up */
932 if (acpi_fadt.sci_int == gsi)
935 ioapic = mp_find_ioapic(gsi);
937 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
941 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_start;
944 * Avoid pin reprogramming. PRTs typically include entries
945 * with redundant pin->gsi mappings (but unique PCI devices);
946 * we only program the IOAPIC on the first.
948 bit = ioapic_pin % 32;
949 idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
951 printk(KERN_ERR "Invalid reference to IOAPIC pin "
952 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
956 if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
957 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
958 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
959 return gsi_to_irq[gsi];
962 mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
964 if (triggering == ACPI_LEVEL_SENSITIVE) {
966 * For PCI devices assign IRQs in order, avoiding gaps
967 * due to unused I/O APIC pins.
970 if (gsi < MAX_GSI_NUM) {
972 * Retain the VIA chipset work-around (gsi > 15), but
973 * avoid a problem where the 8254 timer (IRQ0) is setup
974 * via an override (so it's not on pin 0 of the ioapic),
975 * and at the same time, the pin 0 interrupt is a PCI
976 * type. The gsi > 15 test could cause these two pins
977 * to be shared as IRQ0, and they are not shareable.
978 * So test for this condition, and if necessary, avoid
981 if (gsi > 15 || (gsi == 0 && !timer_uses_ioapic_pin_0))
984 * Don't assign IRQ used by ACPI SCI
986 if (gsi == acpi_fadt.sci_int)
988 gsi_to_irq[irq] = gsi;
990 printk(KERN_ERR "GSI %u is too high\n", gsi);
995 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
996 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
997 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1001 #endif /*CONFIG_X86_IO_APIC*/
1002 #endif /*CONFIG_ACPI*/