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>
7 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
11 #include <linux/init.h>
12 #include <linux/delay.h>
13 #include <linux/bootmem.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/mc146818rtc.h>
16 #include <linux/bitops.h>
17 #include <linux/acpi.h>
18 #include <linux/module.h>
22 #include <asm/mpspec.h>
23 #include <asm/pgalloc.h>
24 #include <asm/io_apic.h>
25 #include <asm/proto.h>
27 #include <asm/bios_ebda.h>
29 #include <mach_apic.h>
31 #include <mach_apicdef.h>
32 #include <mach_mpparse.h>
35 /* Have we found an MP table */
39 * Various Linux-internal data structures created from the
42 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
43 int mp_bus_id_to_type[MAX_MP_BUSSES];
46 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
47 int mp_bus_id_to_pci_bus[MAX_MP_BUSSES] = {[0 ... MAX_MP_BUSSES - 1] = -1 };
49 static int mp_current_pci_id;
54 * Intel MP BIOS table parsing routines:
58 * Checksum an MP configuration block.
61 static int __init mpf_checksum(unsigned char *mp, int len)
71 #ifdef CONFIG_X86_NUMAQ
73 * Have to match translation table entries to main table entries by counter
74 * hence the mpc_record variable .... can't see a less disgusting way of
78 static int mpc_record;
79 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
83 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
86 char *bootup_cpu = "";
88 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
92 #ifdef CONFIG_X86_NUMAQ
93 apicid = mpc_apic_id(m, translation_table[mpc_record]);
95 apicid = m->mpc_apicid;
97 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
98 bootup_cpu = " (Bootup-CPU)";
99 boot_cpu_physical_apicid = m->mpc_apicid;
102 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
103 generic_processor_info(apicid, m->mpc_apicver);
106 static void __init MP_bus_info(struct mpc_config_bus *m)
110 memcpy(str, m->mpc_bustype, 6);
113 #ifdef CONFIG_X86_NUMAQ
114 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
116 Dprintk("Bus #%d is %s\n", m->mpc_busid, str);
119 #if MAX_MP_BUSSES < 256
120 if (m->mpc_busid >= MAX_MP_BUSSES) {
121 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
122 " is too large, max. supported is %d\n",
123 m->mpc_busid, str, MAX_MP_BUSSES - 1);
128 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
129 set_bit(m->mpc_busid, mp_bus_not_pci);
130 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
131 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
133 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
134 #ifdef CONFIG_X86_NUMAQ
135 mpc_oem_pci_bus(m, translation_table[mpc_record]);
137 clear_bit(m->mpc_busid, mp_bus_not_pci);
138 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
140 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
141 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
142 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
143 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
144 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
145 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
148 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
151 #ifdef CONFIG_X86_IO_APIC
153 static int bad_ioapic(unsigned long address)
155 if (nr_ioapics >= MAX_IO_APICS) {
156 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
157 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
158 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
161 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
162 " found in table, skipping!\n");
168 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
170 if (!(m->mpc_flags & MPC_APIC_USABLE))
173 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
174 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
176 if (bad_ioapic(m->mpc_apicaddr))
179 mp_ioapics[nr_ioapics] = *m;
183 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
185 mp_irqs[mp_irq_entries] = *m;
186 Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
187 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
188 m->mpc_irqtype, m->mpc_irqflag & 3,
189 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
190 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
191 if (++mp_irq_entries == MAX_IRQ_SOURCES)
192 panic("Max # of irq sources exceeded!!\n");
197 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
199 Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
200 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
201 m->mpc_irqtype, m->mpc_irqflag & 3,
202 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
203 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
206 #ifdef CONFIG_X86_NUMAQ
207 static void __init MP_translation_info(struct mpc_config_translation *m)
210 "Translation: record %d, type %d, quad %d, global %d, local %d\n",
211 mpc_record, m->trans_type, m->trans_quad, m->trans_global,
214 if (mpc_record >= MAX_MPC_ENTRY)
215 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
217 translation_table[mpc_record] = m; /* stash this for later */
218 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
219 node_set_online(m->trans_quad);
223 * Read/parse the MPC oem tables
226 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
227 unsigned short oemsize)
229 int count = sizeof(*oemtable); /* the header size */
230 unsigned char *oemptr = ((unsigned char *)oemtable) + count;
233 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
235 if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
237 "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
238 oemtable->oem_signature[0], oemtable->oem_signature[1],
239 oemtable->oem_signature[2], oemtable->oem_signature[3]);
242 if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
243 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
246 while (count < oemtable->oem_length) {
250 struct mpc_config_translation *m =
251 (struct mpc_config_translation *)oemptr;
252 MP_translation_info(m);
253 oemptr += sizeof(*m);
261 "Unrecognised OEM table entry type! - %d\n",
269 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
272 if (strncmp(oem, "IBM NUMA", 8))
273 printk("Warning! May not be a NUMA-Q system!\n");
275 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
278 #endif /* CONFIG_X86_NUMAQ */
284 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
288 int count = sizeof(*mpc);
289 unsigned char *mpt = ((unsigned char *)mpc) + count;
291 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
292 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
293 mpc->mpc_signature[0], mpc->mpc_signature[1],
294 mpc->mpc_signature[2], mpc->mpc_signature[3]);
297 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
298 printk(KERN_ERR "MPTABLE: checksum error!\n");
301 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
302 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
306 if (!mpc->mpc_lapic) {
307 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
310 memcpy(oem, mpc->mpc_oem, 8);
312 printk(KERN_INFO "MPTABLE: OEM ID: %s ", oem);
314 memcpy(str, mpc->mpc_productid, 12);
316 printk("Product ID: %s ", str);
319 mps_oem_check(mpc, oem, str);
321 printk(KERN_INFO "MPTABLE: Product ID: %s ", str);
323 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
325 /* save the local APIC address, it might be non-default */
327 mp_lapic_addr = mpc->mpc_lapic;
333 * Now process the configuration blocks.
335 #ifdef CONFIG_X86_NUMAQ
338 while (count < mpc->mpc_length) {
342 struct mpc_config_processor *m =
343 (struct mpc_config_processor *)mpt;
344 /* ACPI may have already provided this data */
346 MP_processor_info(m);
353 struct mpc_config_bus *m =
354 (struct mpc_config_bus *)mpt;
362 #ifdef CONFIG_X86_IO_APIC
363 struct mpc_config_ioapic *m =
364 (struct mpc_config_ioapic *)mpt;
367 mpt += sizeof(struct mpc_config_ioapic);
368 count += sizeof(struct mpc_config_ioapic);
373 #ifdef CONFIG_X86_IO_APIC
374 struct mpc_config_intsrc *m =
375 (struct mpc_config_intsrc *)mpt;
379 mpt += sizeof(struct mpc_config_intsrc);
380 count += sizeof(struct mpc_config_intsrc);
385 struct mpc_config_lintsrc *m =
386 (struct mpc_config_lintsrc *)mpt;
394 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
395 printk(KERN_ERR "type %x\n", *mpt);
396 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
397 1, mpc, mpc->mpc_length, 1);
398 count = mpc->mpc_length;
401 #ifdef CONFIG_X86_NUMAQ
405 setup_apic_routing();
407 printk(KERN_ERR "MPTABLE: no processors registered!\n");
408 return num_processors;
411 #ifdef CONFIG_X86_IO_APIC
413 static int __init ELCR_trigger(unsigned int irq)
417 port = 0x4d0 + (irq >> 3);
418 return (inb(port) >> (irq & 7)) & 1;
421 static void __init construct_default_ioirq_mptable(int mpc_default_type)
423 struct mpc_config_intsrc intsrc;
425 int ELCR_fallback = 0;
427 intsrc.mpc_type = MP_INTSRC;
428 intsrc.mpc_irqflag = 0; /* conforming */
429 intsrc.mpc_srcbus = 0;
430 intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
432 intsrc.mpc_irqtype = mp_INT;
435 * If true, we have an ISA/PCI system with no IRQ entries
436 * in the MP table. To prevent the PCI interrupts from being set up
437 * incorrectly, we try to use the ELCR. The sanity check to see if
438 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
439 * never be level sensitive, so we simply see if the ELCR agrees.
440 * If it does, we assume it's valid.
442 if (mpc_default_type == 5) {
443 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
444 "falling back to ELCR\n");
446 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
448 printk(KERN_ERR "ELCR contains invalid data... "
452 "Using ELCR to identify PCI interrupts\n");
457 for (i = 0; i < 16; i++) {
458 switch (mpc_default_type) {
460 if (i == 0 || i == 13)
461 continue; /* IRQ0 & IRQ13 not connected */
465 continue; /* IRQ2 is never connected */
470 * If the ELCR indicates a level-sensitive interrupt, we
471 * copy that information over to the MP table in the
472 * irqflag field (level sensitive, active high polarity).
475 intsrc.mpc_irqflag = 13;
477 intsrc.mpc_irqflag = 0;
480 intsrc.mpc_srcbusirq = i;
481 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
482 MP_intsrc_info(&intsrc);
485 intsrc.mpc_irqtype = mp_ExtINT;
486 intsrc.mpc_srcbusirq = 0;
487 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
488 MP_intsrc_info(&intsrc);
493 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
495 struct mpc_config_processor processor;
496 struct mpc_config_bus bus;
497 #ifdef CONFIG_X86_IO_APIC
498 struct mpc_config_ioapic ioapic;
500 struct mpc_config_lintsrc lintsrc;
501 int linttypes[2] = { mp_ExtINT, mp_NMI };
505 * local APIC has default address
507 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
510 * 2 CPUs, numbered 0 & 1.
512 processor.mpc_type = MP_PROCESSOR;
513 /* Either an integrated APIC or a discrete 82489DX. */
514 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
515 processor.mpc_cpuflag = CPU_ENABLED;
516 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
517 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
518 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
519 processor.mpc_reserved[0] = 0;
520 processor.mpc_reserved[1] = 0;
521 for (i = 0; i < 2; i++) {
522 processor.mpc_apicid = i;
523 MP_processor_info(&processor);
526 bus.mpc_type = MP_BUS;
528 switch (mpc_default_type) {
530 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
535 memcpy(bus.mpc_bustype, "ISA ", 6);
540 memcpy(bus.mpc_bustype, "EISA ", 6);
544 memcpy(bus.mpc_bustype, "MCA ", 6);
547 if (mpc_default_type > 4) {
549 memcpy(bus.mpc_bustype, "PCI ", 6);
553 #ifdef CONFIG_X86_IO_APIC
554 ioapic.mpc_type = MP_IOAPIC;
555 ioapic.mpc_apicid = 2;
556 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
557 ioapic.mpc_flags = MPC_APIC_USABLE;
558 ioapic.mpc_apicaddr = 0xFEC00000;
559 MP_ioapic_info(&ioapic);
562 * We set up most of the low 16 IO-APIC pins according to MPS rules.
564 construct_default_ioirq_mptable(mpc_default_type);
566 lintsrc.mpc_type = MP_LINTSRC;
567 lintsrc.mpc_irqflag = 0; /* conforming */
568 lintsrc.mpc_srcbusid = 0;
569 lintsrc.mpc_srcbusirq = 0;
570 lintsrc.mpc_destapic = MP_APIC_ALL;
571 for (i = 0; i < 2; i++) {
572 lintsrc.mpc_irqtype = linttypes[i];
573 lintsrc.mpc_destapiclint = i;
574 MP_lintsrc_info(&lintsrc);
578 static struct intel_mp_floating *mpf_found;
581 * Scan the memory blocks for an SMP configuration block.
583 static void __init __get_smp_config(unsigned early)
585 struct intel_mp_floating *mpf = mpf_found;
587 if (acpi_lapic && early)
590 * ACPI supports both logical (e.g. Hyper-Threading) and physical
591 * processors, where MPS only supports physical.
593 if (acpi_lapic && acpi_ioapic) {
594 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
597 } else if (acpi_lapic)
598 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
599 "configuration information\n");
601 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
602 mpf->mpf_specification);
604 if (mpf->mpf_feature2 & (1 << 7)) {
605 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
608 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
613 * Now see if we need to read further.
615 if (mpf->mpf_feature1 != 0) {
618 * local APIC has default address
620 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
624 printk(KERN_INFO "Default MP configuration #%d\n",
626 construct_default_ISA_mptable(mpf->mpf_feature1);
628 } else if (mpf->mpf_physptr) {
631 * Read the physical hardware table. Anything here will
632 * override the defaults.
634 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
635 smp_found_config = 0;
637 "BIOS bug, MP table errors detected!...\n");
638 printk(KERN_ERR "... disabling SMP support. "
639 "(tell your hw vendor)\n");
645 #ifdef CONFIG_X86_IO_APIC
647 * If there are no explicit MP IRQ entries, then we are
648 * broken. We set up most of the low 16 IO-APIC pins to
649 * ISA defaults and hope it will work.
651 if (!mp_irq_entries) {
652 struct mpc_config_bus bus;
654 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
655 "using default mptable. "
656 "(tell your hw vendor)\n");
658 bus.mpc_type = MP_BUS;
660 memcpy(bus.mpc_bustype, "ISA ", 6);
663 construct_default_ioirq_mptable(0);
670 printk(KERN_INFO "Processors: %d\n", num_processors);
672 * Only use the first configuration found.
676 void __init early_get_smp_config(void)
681 void __init get_smp_config(void)
686 static int __init smp_scan_config(unsigned long base, unsigned long length,
689 unsigned int *bp = phys_to_virt(base);
690 struct intel_mp_floating *mpf;
692 Dprintk("Scan SMP from %p for %ld bytes.\n", bp, length);
693 BUILD_BUG_ON(sizeof(*mpf) != 16);
696 mpf = (struct intel_mp_floating *)bp;
697 if ((*bp == SMP_MAGIC_IDENT) &&
698 (mpf->mpf_length == 1) &&
699 !mpf_checksum((unsigned char *)bp, 16) &&
700 ((mpf->mpf_specification == 1)
701 || (mpf->mpf_specification == 4))) {
703 smp_found_config = 1;
706 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
707 mpf, virt_to_phys(mpf));
708 reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
710 if (mpf->mpf_physptr) {
712 * We cannot access to MPC table to compute
713 * table size yet, as only few megabytes from
714 * the bottom is mapped now.
715 * PC-9800's MPC table places on the very last
716 * of physical memory; so that simply reserving
717 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
718 * in reserve_bootmem.
720 unsigned long size = PAGE_SIZE;
721 unsigned long end = max_low_pfn * PAGE_SIZE;
722 if (mpf->mpf_physptr + size > end)
723 size = end - mpf->mpf_physptr;
724 reserve_bootmem(mpf->mpf_physptr, size,
732 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
733 if (mpf->mpf_physptr)
734 reserve_bootmem_generic(mpf->mpf_physptr,
745 static void __init __find_smp_config(unsigned reserve)
747 unsigned int address;
750 * FIXME: Linux assumes you have 640K of base ram..
751 * this continues the error...
753 * 1) Scan the bottom 1K for a signature
754 * 2) Scan the top 1K of base RAM
755 * 3) Scan the 64K of bios
757 if (smp_scan_config(0x0, 0x400, reserve) ||
758 smp_scan_config(639 * 0x400, 0x400, reserve) ||
759 smp_scan_config(0xF0000, 0x10000, reserve))
762 * If it is an SMP machine we should know now, unless the
763 * configuration is in an EISA/MCA bus machine with an
764 * extended bios data area.
766 * there is a real-mode segmented pointer pointing to the
767 * 4K EBDA area at 0x40E, calculate and scan it here.
769 * NOTE! There are Linux loaders that will corrupt the EBDA
770 * area, and as such this kind of SMP config may be less
771 * trustworthy, simply because the SMP table may have been
772 * stomped on during early boot. These loaders are buggy and
775 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
778 address = get_bios_ebda();
780 smp_scan_config(address, 0x400, reserve);
783 void __init early_find_smp_config(void)
785 __find_smp_config(0);
788 void __init find_smp_config(void)
790 __find_smp_config(1);
793 /* --------------------------------------------------------------------------
794 ACPI-based MP Configuration
795 -------------------------------------------------------------------------- */
799 #ifdef CONFIG_X86_IO_APIC
803 extern struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
805 static int mp_find_ioapic(int gsi)
809 /* Find the IOAPIC that manages this GSI. */
810 for (i = 0; i < nr_ioapics; i++) {
811 if ((gsi >= mp_ioapic_routing[i].gsi_base)
812 && (gsi <= mp_ioapic_routing[i].gsi_end))
816 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
820 static u8 __init uniq_ioapic_id(u8 id)
823 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
824 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
825 return io_apic_get_unique_id(nr_ioapics, id);
830 DECLARE_BITMAP(used, 256);
831 bitmap_zero(used, 256);
832 for (i = 0; i < nr_ioapics; i++) {
833 struct mpc_config_ioapic *ia = &mp_ioapics[i];
834 __set_bit(ia->mpc_apicid, used);
836 if (!test_bit(id, used))
838 return find_first_zero_bit(used, 256);
842 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
846 if (bad_ioapic(address))
851 mp_ioapics[idx].mpc_type = MP_IOAPIC;
852 mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
853 mp_ioapics[idx].mpc_apicaddr = address;
855 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
856 mp_ioapics[idx].mpc_apicid = uniq_ioapic_id(id);
858 mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
860 mp_ioapics[idx].mpc_apicver = 0;
863 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
864 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
866 mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
867 mp_ioapic_routing[idx].gsi_base = gsi_base;
868 mp_ioapic_routing[idx].gsi_end = gsi_base +
869 io_apic_get_redir_entries(idx);
871 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
872 "GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
873 mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
874 mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);
879 void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
881 struct mpc_config_intsrc intsrc;
886 * Convert 'gsi' to 'ioapic.pin'.
888 ioapic = mp_find_ioapic(gsi);
891 pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
894 * TBD: This check is for faulty timer entries, where the override
895 * erroneously sets the trigger to level, resulting in a HUGE
896 * increase of timer interrupts!
898 if ((bus_irq == 0) && (trigger == 3))
901 intsrc.mpc_type = MP_INTSRC;
902 intsrc.mpc_irqtype = mp_INT;
903 intsrc.mpc_irqflag = (trigger << 2) | polarity;
904 intsrc.mpc_srcbus = MP_ISA_BUS;
905 intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
906 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
907 intsrc.mpc_dstirq = pin; /* INTIN# */
909 MP_intsrc_info(&intsrc);
914 void __init mp_config_acpi_legacy_irqs(void)
916 struct mpc_config_intsrc intsrc;
920 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
922 * Fabricate the legacy ISA bus (bus #31).
924 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
926 set_bit(MP_ISA_BUS, mp_bus_not_pci);
927 Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
930 * Older generations of ES7000 have no legacy identity mappings
932 if (es7000_plat == 1)
936 * Locate the IOAPIC that manages the ISA IRQs (0-15).
938 ioapic = mp_find_ioapic(0);
942 intsrc.mpc_type = MP_INTSRC;
943 intsrc.mpc_irqflag = 0; /* Conforming */
944 intsrc.mpc_srcbus = MP_ISA_BUS;
945 #ifdef CONFIG_X86_IO_APIC
946 intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
949 * Use the default configuration for the IRQs 0-15. Unless
950 * overridden by (MADT) interrupt source override entries.
952 for (i = 0; i < 16; i++) {
955 for (idx = 0; idx < mp_irq_entries; idx++) {
956 struct mpc_config_intsrc *irq = mp_irqs + idx;
958 /* Do we already have a mapping for this ISA IRQ? */
959 if (irq->mpc_srcbus == MP_ISA_BUS
960 && irq->mpc_srcbusirq == i)
963 /* Do we already have a mapping for this IOAPIC pin */
964 if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
965 (irq->mpc_dstirq == i))
969 if (idx != mp_irq_entries) {
970 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
971 continue; /* IRQ already used */
974 intsrc.mpc_irqtype = mp_INT;
975 intsrc.mpc_srcbusirq = i; /* Identity mapped */
976 intsrc.mpc_dstirq = i;
978 MP_intsrc_info(&intsrc);
982 int mp_register_gsi(u32 gsi, int triggering, int polarity)
987 #define MAX_GSI_NUM 4096
988 #define IRQ_COMPRESSION_START 64
990 static int pci_irq = IRQ_COMPRESSION_START;
992 * Mapping between Global System Interrupts, which
993 * represent all possible interrupts, and IRQs
994 * assigned to actual devices.
996 static int gsi_to_irq[MAX_GSI_NUM];
999 if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
1003 /* Don't set up the ACPI SCI because it's already set up */
1004 if (acpi_gbl_FADT.sci_interrupt == gsi)
1007 ioapic = mp_find_ioapic(gsi);
1009 printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
1013 ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
1015 #ifdef CONFIG_X86_32
1016 if (ioapic_renumber_irq)
1017 gsi = ioapic_renumber_irq(ioapic, gsi);
1021 * Avoid pin reprogramming. PRTs typically include entries
1022 * with redundant pin->gsi mappings (but unique PCI devices);
1023 * we only program the IOAPIC on the first.
1025 if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
1026 printk(KERN_ERR "Invalid reference to IOAPIC pin "
1027 "%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
1031 if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) {
1032 Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
1033 mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
1034 #ifdef CONFIG_X86_32
1035 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]);
1041 set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed);
1042 #ifdef CONFIG_X86_32
1044 * For GSI >= 64, use IRQ compression
1046 if ((gsi >= IRQ_COMPRESSION_START)
1047 && (triggering == ACPI_LEVEL_SENSITIVE)) {
1049 * For PCI devices assign IRQs in order, avoiding gaps
1050 * due to unused I/O APIC pins.
1053 if (gsi < MAX_GSI_NUM) {
1055 * Retain the VIA chipset work-around (gsi > 15), but
1056 * avoid a problem where the 8254 timer (IRQ0) is setup
1057 * via an override (so it's not on pin 0 of the ioapic),
1058 * and at the same time, the pin 0 interrupt is a PCI
1059 * type. The gsi > 15 test could cause these two pins
1060 * to be shared as IRQ0, and they are not shareable.
1061 * So test for this condition, and if necessary, avoid
1062 * the pin collision.
1066 * Don't assign IRQ used by ACPI SCI
1068 if (gsi == acpi_gbl_FADT.sci_interrupt)
1070 gsi_to_irq[irq] = gsi;
1072 printk(KERN_ERR "GSI %u is too high\n", gsi);
1077 io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
1078 triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
1079 polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
1083 #endif /* CONFIG_X86_IO_APIC */
1084 #endif /* CONFIG_ACPI */