The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/i386/acpica/madt.c

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    1 /*-
    2  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the author nor the names of any co-contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/8.0/sys/i386/acpica/madt.c 193530 2009-06-05 18:44:36Z jkim $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/smp.h>
   39 
   40 #include <vm/vm.h>
   41 #include <vm/vm_param.h>
   42 #include <vm/pmap.h>
   43 
   44 #include <machine/apicreg.h>
   45 #include <machine/frame.h>
   46 #include <machine/intr_machdep.h>
   47 #include <machine/apicvar.h>
   48 #include <machine/md_var.h>
   49 #include <machine/specialreg.h>
   50 
   51 #include <contrib/dev/acpica/include/acpi.h>
   52 #include <contrib/dev/acpica/include/accommon.h>
   53 #include <contrib/dev/acpica/include/actables.h>
   54 
   55 #include <dev/acpica/acpivar.h>
   56 #include <dev/pci/pcivar.h>
   57 
   58 typedef void madt_entry_handler(ACPI_SUBTABLE_HEADER *entry, void *arg);
   59 
   60 /* These two arrays are indexed by APIC IDs. */
   61 struct ioapic_info {
   62         void *io_apic;
   63         UINT32 io_vector;
   64 } ioapics[MAX_APIC_ID + 1];
   65 
   66 struct lapic_info {
   67         u_int la_enabled:1;
   68         u_int la_acpi_id:8;
   69 } lapics[MAX_APIC_ID + 1];
   70 
   71 static int madt_found_sci_override;
   72 static ACPI_TABLE_MADT *madt;
   73 static vm_paddr_t madt_physaddr;
   74 static vm_offset_t madt_length;
   75 
   76 MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items");
   77 
   78 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source);
   79 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source);
   80 static int      madt_find_cpu(u_int acpi_id, u_int *apic_id);
   81 static int      madt_find_interrupt(int intr, void **apic, u_int *pin);
   82 static void     *madt_map(vm_paddr_t pa, int offset, vm_offset_t length);
   83 static void     *madt_map_table(vm_paddr_t pa, int offset, const char *sig);
   84 static void     madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg);
   85 static void     madt_parse_interrupt_override(
   86                     ACPI_MADT_INTERRUPT_OVERRIDE *intr);
   87 static void     madt_parse_ints(ACPI_SUBTABLE_HEADER *entry,
   88                     void *arg __unused);
   89 static void     madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi);
   90 static void     madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi);
   91 static int      madt_probe(void);
   92 static int      madt_probe_cpus(void);
   93 static void     madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry,
   94                     void *arg __unused);
   95 static int      madt_probe_table(vm_paddr_t address);
   96 static void     madt_register(void *dummy);
   97 static int      madt_setup_local(void);
   98 static int      madt_setup_io(void);
   99 static void     madt_unmap(void *data, vm_offset_t length);
  100 static void     madt_unmap_table(void *table);
  101 static void     madt_walk_table(madt_entry_handler *handler, void *arg);
  102 
  103 static struct apic_enumerator madt_enumerator = {
  104         "MADT",
  105         madt_probe,
  106         madt_probe_cpus,
  107         madt_setup_local,
  108         madt_setup_io
  109 };
  110 
  111 /*
  112  * Code to abuse the crashdump map to map in the tables for the early
  113  * probe.  We cheat and make the following assumptions about how we
  114  * use this KVA: pages 0 and 1 are used to map in the header of each
  115  * table found via the RSDT or XSDT and pages 2 to n are used to map
  116  * in the RSDT or XSDT.  We have to use 2 pages for the table headers
  117  * in case a header spans a page boundary.  The offset is in pages;
  118  * the length is in bytes.
  119  */
  120 static void *
  121 madt_map(vm_paddr_t pa, int offset, vm_offset_t length)
  122 {
  123         vm_offset_t va, off;
  124         void *data;
  125 
  126         off = pa & PAGE_MASK;
  127         length = roundup(length + off, PAGE_SIZE);
  128         pa = pa & PG_FRAME;
  129         va = (vm_offset_t)pmap_kenter_temporary(pa, offset) +
  130             (offset * PAGE_SIZE);
  131         data = (void *)(va + off);
  132         length -= PAGE_SIZE;
  133         while (length > 0) {
  134                 va += PAGE_SIZE;
  135                 pa += PAGE_SIZE;
  136                 length -= PAGE_SIZE;
  137                 pmap_kenter(va, pa);
  138                 invlpg(va);
  139         }
  140         return (data);
  141 }
  142 
  143 static void
  144 madt_unmap(void *data, vm_offset_t length)
  145 {
  146         vm_offset_t va, off;
  147 
  148         va = (vm_offset_t)data;
  149         off = va & PAGE_MASK;
  150         length = roundup(length + off, PAGE_SIZE);
  151         va &= ~PAGE_MASK;
  152         while (length > 0) {
  153                 pmap_kremove(va);
  154                 invlpg(va);
  155                 va += PAGE_SIZE;
  156                 length -= PAGE_SIZE;
  157         }
  158 }
  159 
  160 static void *
  161 madt_map_table(vm_paddr_t pa, int offset, const char *sig)
  162 {
  163         ACPI_TABLE_HEADER *header;
  164         vm_offset_t length;
  165         void *table;
  166 
  167         header = madt_map(pa, offset, sizeof(ACPI_TABLE_HEADER));
  168         if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) {
  169                 madt_unmap(header, sizeof(ACPI_TABLE_HEADER));
  170                 return (NULL);
  171         }
  172         length = header->Length;
  173         madt_unmap(header, sizeof(ACPI_TABLE_HEADER));
  174         table = madt_map(pa, offset, length);
  175         if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
  176                 if (bootverbose)
  177                         printf("MADT: Failed checksum for table %s\n", sig);
  178                 madt_unmap(table, length);
  179                 return (NULL);
  180         }
  181         return (table);
  182 }
  183 
  184 static void
  185 madt_unmap_table(void *table)
  186 {
  187         ACPI_TABLE_HEADER *header;
  188 
  189         header = (ACPI_TABLE_HEADER *)table;
  190         madt_unmap(table, header->Length);
  191 }
  192 
  193 /*
  194  * Look for an ACPI Multiple APIC Description Table ("APIC")
  195  */
  196 static int
  197 madt_probe(void)
  198 {
  199         ACPI_PHYSICAL_ADDRESS rsdp_ptr;
  200         ACPI_TABLE_RSDP *rsdp;
  201         ACPI_TABLE_RSDT *rsdt;
  202         ACPI_TABLE_XSDT *xsdt;
  203         int i, count;
  204 
  205         if (resource_disabled("acpi", 0))
  206                 return (ENXIO);
  207 
  208         /*
  209          * Map in the RSDP.  Since ACPI uses AcpiOsMapMemory() which in turn
  210          * calls pmap_mapbios() to find the RSDP, we assume that we can use
  211          * pmap_mapbios() to map the RSDP.
  212          */
  213         if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
  214                 return (ENXIO);
  215         rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
  216         if (rsdp == NULL) {
  217                 if (bootverbose)
  218                         printf("MADT: Failed to map RSDP\n");
  219                 return (ENXIO);
  220         }
  221 
  222         /*
  223          * For ACPI >= 2.0, use the XSDT if it is available.
  224          * Otherwise, use the RSDT.  We map the XSDT or RSDT at page 1
  225          * in the crashdump area.  Page 0 is used to map in the
  226          * headers of candidate ACPI tables.
  227          */
  228         if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
  229                 /*
  230                  * AcpiOsGetRootPointer only verifies the checksum for
  231                  * the version 1.0 portion of the RSDP.  Version 2.0 has
  232                  * an additional checksum that we verify first.
  233                  */
  234                 if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
  235                         if (bootverbose)
  236                                 printf("MADT: RSDP failed extended checksum\n");
  237                         return (ENXIO);
  238                 }
  239                 xsdt = madt_map_table(rsdp->XsdtPhysicalAddress, 2,
  240                     ACPI_SIG_XSDT);
  241                 if (xsdt == NULL) {
  242                         if (bootverbose)
  243                                 printf("MADT: Failed to map XSDT\n");
  244                         return (ENXIO);
  245                 }
  246                 count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  247                     sizeof(UINT64);
  248                 for (i = 0; i < count; i++)
  249                         if (madt_probe_table(xsdt->TableOffsetEntry[i]))
  250                                 break;
  251                 madt_unmap_table(xsdt);
  252         } else {
  253                 rsdt = madt_map_table(rsdp->RsdtPhysicalAddress, 2,
  254                     ACPI_SIG_RSDT);
  255                 if (rsdt == NULL) {
  256                         if (bootverbose)
  257                                 printf("MADT: Failed to map RSDT\n");
  258                         return (ENXIO);
  259                 }
  260                 count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  261                     sizeof(UINT32);
  262                 for (i = 0; i < count; i++)
  263                         if (madt_probe_table(rsdt->TableOffsetEntry[i]))
  264                                 break;
  265                 madt_unmap_table(rsdt);
  266         }
  267         pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
  268         if (madt_physaddr == 0) {
  269                 if (bootverbose)
  270                         printf("MADT: No MADT table found\n");
  271                 return (ENXIO);
  272         }
  273         if (bootverbose)
  274                 printf("MADT: Found table at 0x%jx\n",
  275                     (uintmax_t)madt_physaddr);
  276 
  277         /*
  278          * Verify that we can map the full table and that its checksum is
  279          * correct, etc.
  280          */
  281         madt = madt_map_table(madt_physaddr, 0, ACPI_SIG_MADT);
  282         if (madt == NULL)
  283                 return (ENXIO);
  284         madt_unmap_table(madt);
  285         madt = NULL;
  286 
  287         return (0);
  288 }
  289 
  290 /*
  291  * See if a given ACPI table is the MADT.
  292  */
  293 static int
  294 madt_probe_table(vm_paddr_t address)
  295 {
  296         ACPI_TABLE_HEADER *table;
  297 
  298         table = madt_map(address, 0, sizeof(ACPI_TABLE_HEADER));
  299         if (table == NULL) {
  300                 if (bootverbose)
  301                         printf("MADT: Failed to map table at 0x%jx\n",
  302                             (uintmax_t)address);
  303                 return (0);
  304         }
  305         if (bootverbose)
  306                 printf("Table '%.4s' at 0x%jx\n", table->Signature,
  307                     (uintmax_t)address);
  308 
  309         if (strncmp(table->Signature, ACPI_SIG_MADT, ACPI_NAME_SIZE) != 0) {
  310                 madt_unmap(table, sizeof(ACPI_TABLE_HEADER));
  311                 return (0);
  312         }
  313         madt_physaddr = address;
  314         madt_length = table->Length;
  315         madt_unmap(table, sizeof(ACPI_TABLE_HEADER));
  316         return (1);
  317 }
  318 
  319 /*
  320  * Run through the MP table enumerating CPUs.
  321  */
  322 static int
  323 madt_probe_cpus(void)
  324 {
  325 
  326         madt = madt_map_table(madt_physaddr, 0, ACPI_SIG_MADT);
  327         KASSERT(madt != NULL, ("Unable to re-map MADT"));
  328         madt_walk_table(madt_probe_cpus_handler, NULL);
  329         madt_unmap_table(madt);
  330         madt = NULL;
  331         return (0);
  332 }
  333 
  334 /*
  335  * Initialize the local APIC on the BSP.
  336  */
  337 static int
  338 madt_setup_local(void)
  339 {
  340 
  341         madt = pmap_mapbios(madt_physaddr, madt_length);
  342         lapic_init(madt->Address);
  343         printf("ACPI APIC Table: <%.*s %.*s>\n",
  344             (int)sizeof(madt->Header.OemId), madt->Header.OemId,
  345             (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId);
  346 
  347         /*
  348          * We ignore 64-bit local APIC override entries.  Should we
  349          * perhaps emit a warning here if we find one?
  350          */
  351         return (0);
  352 }
  353 
  354 /*
  355  * Enumerate I/O APICs and setup interrupt sources.
  356  */
  357 static int
  358 madt_setup_io(void)
  359 {
  360         void *ioapic;
  361         u_int pin;
  362         int i;
  363 
  364         /* Try to initialize ACPI so that we can access the FADT. */
  365         i = acpi_Startup();
  366         if (ACPI_FAILURE(i)) {
  367                 printf("MADT: ACPI Startup failed with %s\n",
  368                     AcpiFormatException(i));
  369                 printf("Try disabling either ACPI or apic support.\n");
  370                 panic("Using MADT but ACPI doesn't work");
  371         }
  372                     
  373         /* First, we run through adding I/O APIC's. */
  374         madt_walk_table(madt_parse_apics, NULL);
  375 
  376         /* Second, we run through the table tweaking interrupt sources. */
  377         madt_walk_table(madt_parse_ints, NULL);
  378 
  379         /*
  380          * If there was not an explicit override entry for the SCI,
  381          * force it to use level trigger and active-low polarity.
  382          */
  383         if (!madt_found_sci_override) {
  384                 if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic,
  385                     &pin) != 0)
  386                         printf("MADT: Could not find APIC for SCI IRQ %u\n",
  387                             AcpiGbl_FADT.SciInterrupt);
  388                 else {
  389                         printf(
  390         "MADT: Forcing active-low polarity and level trigger for SCI\n");
  391                         ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW);
  392                         ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL);
  393                 }
  394         }
  395 
  396         /* Third, we register all the I/O APIC's. */
  397         for (i = 0; i <= MAX_APIC_ID; i++)
  398                 if (ioapics[i].io_apic != NULL)
  399                         ioapic_register(ioapics[i].io_apic);
  400 
  401         /* Finally, we throw the switch to enable the I/O APIC's. */
  402         acpi_SetDefaultIntrModel(ACPI_INTR_APIC);
  403 
  404         return (0);
  405 }
  406 
  407 static void
  408 madt_register(void *dummy __unused)
  409 {
  410 
  411         apic_register_enumerator(&madt_enumerator);
  412 }
  413 SYSINIT(madt_register, SI_SUB_CPU - 1, SI_ORDER_SECOND, madt_register, NULL);
  414 
  415 /*
  416  * Call the handler routine for each entry in the MADT table.
  417  */
  418 static void
  419 madt_walk_table(madt_entry_handler *handler, void *arg)
  420 {
  421         ACPI_SUBTABLE_HEADER *entry;
  422         u_char *p, *end;
  423 
  424         end = (u_char *)(madt) + madt->Header.Length;
  425         for (p = (u_char *)(madt + 1); p < end; ) {
  426                 entry = (ACPI_SUBTABLE_HEADER *)p;
  427                 handler(entry, arg);
  428                 p += entry->Length;
  429         }
  430 }
  431 
  432 static void
  433 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg)
  434 {
  435         ACPI_MADT_LOCAL_APIC *proc;
  436         struct lapic_info *la;
  437 
  438         switch (entry->Type) {
  439         case ACPI_MADT_TYPE_LOCAL_APIC:
  440                 /*
  441                  * The MADT does not include a BSP flag, so we have to
  442                  * let the MP code figure out which CPU is the BSP on
  443                  * its own.
  444                  */
  445                 proc = (ACPI_MADT_LOCAL_APIC *)entry;
  446                 if (bootverbose)
  447                         printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n",
  448                             proc->Id, proc->ProcessorId,
  449                             (proc->LapicFlags & ACPI_MADT_ENABLED) ?
  450                             "enabled" : "disabled");
  451                 if (!(proc->LapicFlags & ACPI_MADT_ENABLED))
  452                         break;
  453                 if (proc->Id > MAX_APIC_ID)
  454                         panic("%s: CPU ID %u too high", __func__, proc->Id);
  455                 la = &lapics[proc->Id];
  456                 KASSERT(la->la_enabled == 0,
  457                     ("Duplicate local APIC ID %u", proc->Id));
  458                 la->la_enabled = 1;
  459                 la->la_acpi_id = proc->ProcessorId;
  460                 lapic_create(proc->Id, 0);
  461                 break;
  462         }
  463 }
  464 
  465 
  466 /*
  467  * Add an I/O APIC from an entry in the table.
  468  */
  469 static void
  470 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
  471 {
  472         ACPI_MADT_IO_APIC *apic;
  473 
  474         switch (entry->Type) {
  475         case ACPI_MADT_TYPE_IO_APIC:
  476                 apic = (ACPI_MADT_IO_APIC *)entry;
  477                 if (bootverbose)
  478                         printf(
  479                             "MADT: Found IO APIC ID %u, Interrupt %u at %p\n",
  480                             apic->Id, apic->GlobalIrqBase,
  481                             (void *)(uintptr_t)apic->Address);
  482                 if (apic->Id > MAX_APIC_ID)
  483                         panic("%s: I/O APIC ID %u too high", __func__,
  484                             apic->Id);
  485                 if (ioapics[apic->Id].io_apic != NULL)
  486                         panic("%s: Double APIC ID %u", __func__, apic->Id);
  487                 if (apic->GlobalIrqBase >= FIRST_MSI_INT) {
  488                         printf("MADT: Ignoring bogus I/O APIC ID %u", apic->Id);
  489                         break;
  490                 }
  491                 ioapics[apic->Id].io_apic = ioapic_create(apic->Address,
  492                     apic->Id, apic->GlobalIrqBase);
  493                 ioapics[apic->Id].io_vector = apic->GlobalIrqBase;
  494                 break;
  495         default:
  496                 break;
  497         }
  498 }
  499 
  500 /*
  501  * Determine properties of an interrupt source.  Note that for ACPI these
  502  * functions are only used for ISA interrupts, so we assume ISA bus values
  503  * (Active Hi, Edge Triggered) for conforming values except for the ACPI
  504  * SCI for which we use Active Lo, Level Triggered.
  505  */
  506 static enum intr_polarity
  507 interrupt_polarity(UINT16 IntiFlags, UINT8 Source)
  508 {
  509 
  510         switch (IntiFlags & ACPI_MADT_POLARITY_MASK) {
  511         case ACPI_MADT_POLARITY_CONFORMS:
  512                 if (Source == AcpiGbl_FADT.SciInterrupt)
  513                         return (INTR_POLARITY_LOW);
  514                 else
  515                         return (INTR_POLARITY_HIGH);
  516         case ACPI_MADT_POLARITY_ACTIVE_HIGH:
  517                 return (INTR_POLARITY_HIGH);
  518         case ACPI_MADT_POLARITY_ACTIVE_LOW:
  519                 return (INTR_POLARITY_LOW);
  520         default:
  521                 panic("Bogus Interrupt Polarity");
  522         }
  523 }
  524 
  525 static enum intr_trigger
  526 interrupt_trigger(UINT16 IntiFlags, UINT8 Source)
  527 {
  528 
  529         switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) {
  530         case ACPI_MADT_TRIGGER_CONFORMS:
  531                 if (Source == AcpiGbl_FADT.SciInterrupt)
  532                         return (INTR_TRIGGER_LEVEL);
  533                 else
  534                         return (INTR_TRIGGER_EDGE);
  535         case ACPI_MADT_TRIGGER_EDGE:
  536                 return (INTR_TRIGGER_EDGE);
  537         case ACPI_MADT_TRIGGER_LEVEL:
  538                 return (INTR_TRIGGER_LEVEL);
  539         default:
  540                 panic("Bogus Interrupt Trigger Mode");
  541         }
  542 }
  543 
  544 /*
  545  * Find the local APIC ID associated with a given ACPI Processor ID.
  546  */
  547 static int
  548 madt_find_cpu(u_int acpi_id, u_int *apic_id)
  549 {
  550         int i;
  551 
  552         for (i = 0; i <= MAX_APIC_ID; i++) {
  553                 if (!lapics[i].la_enabled)
  554                         continue;
  555                 if (lapics[i].la_acpi_id != acpi_id)
  556                         continue;
  557                 *apic_id = i;
  558                 return (0);
  559         }
  560         return (ENOENT);
  561 }
  562 
  563 /*
  564  * Find the IO APIC and pin on that APIC associated with a given global
  565  * interrupt.
  566  */
  567 static int
  568 madt_find_interrupt(int intr, void **apic, u_int *pin)
  569 {
  570         int i, best;
  571 
  572         best = -1;
  573         for (i = 0; i <= MAX_APIC_ID; i++) {
  574                 if (ioapics[i].io_apic == NULL ||
  575                     ioapics[i].io_vector > intr)
  576                         continue;
  577                 if (best == -1 ||
  578                     ioapics[best].io_vector < ioapics[i].io_vector)
  579                         best = i;
  580         }
  581         if (best == -1)
  582                 return (ENOENT);
  583         *apic = ioapics[best].io_apic;
  584         *pin = intr - ioapics[best].io_vector;
  585         if (*pin > 32)
  586                 printf("WARNING: Found intpin of %u for vector %d\n", *pin,
  587                     intr);
  588         return (0);
  589 }
  590 
  591 /*
  592  * Parse an interrupt source override for an ISA interrupt.
  593  */
  594 static void
  595 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr)
  596 {
  597         void *new_ioapic, *old_ioapic;
  598         u_int new_pin, old_pin;
  599         enum intr_trigger trig;
  600         enum intr_polarity pol;
  601         char buf[64];
  602 
  603         if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 &&
  604             intr->GlobalIrq == 2) {
  605                 if (bootverbose)
  606                         printf("MADT: Skipping timer override\n");
  607                 return;
  608         }
  609         if (bootverbose)
  610                 printf("MADT: Interrupt override: source %u, irq %u\n",
  611                     intr->SourceIrq, intr->GlobalIrq);
  612         KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero"));
  613         if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) {
  614                 printf("MADT: Could not find APIC for vector %u (IRQ %u)\n",
  615                     intr->GlobalIrq, intr->SourceIrq);
  616                 return;
  617         }
  618 
  619         /*
  620          * Lookup the appropriate trigger and polarity modes for this
  621          * entry.
  622          */
  623         trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq);
  624         pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq);
  625         
  626         /*
  627          * If the SCI is identity mapped but has edge trigger and
  628          * active-hi polarity or the force_sci_lo tunable is set,
  629          * force it to use level/lo.
  630          */
  631         if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) {
  632                 madt_found_sci_override = 1;
  633                 if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) {
  634                         if (tolower(buf[0]) == 'e')
  635                                 trig = INTR_TRIGGER_EDGE;
  636                         else if (tolower(buf[0]) == 'l')
  637                                 trig = INTR_TRIGGER_LEVEL;
  638                         else
  639                                 panic(
  640                                 "Invalid trigger %s: must be 'edge' or 'level'",
  641                                     buf);
  642                         printf("MADT: Forcing SCI to %s trigger\n",
  643                             trig == INTR_TRIGGER_EDGE ? "edge" : "level");
  644                 }
  645                 if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) {
  646                         if (tolower(buf[0]) == 'h')
  647                                 pol = INTR_POLARITY_HIGH;
  648                         else if (tolower(buf[0]) == 'l')
  649                                 pol = INTR_POLARITY_LOW;
  650                         else
  651                                 panic(
  652                                 "Invalid polarity %s: must be 'high' or 'low'",
  653                                     buf);
  654                         printf("MADT: Forcing SCI to active %s polarity\n",
  655                             pol == INTR_POLARITY_HIGH ? "high" : "low");
  656                 }
  657         }
  658 
  659         /* Remap the IRQ if it is mapped to a different interrupt vector. */
  660         if (intr->SourceIrq != intr->GlobalIrq) {
  661                 /*
  662                  * If the SCI is remapped to a non-ISA global interrupt,
  663                  * then override the vector we use to setup and allocate
  664                  * the interrupt.
  665                  */
  666                 if (intr->GlobalIrq > 15 &&
  667                     intr->SourceIrq == AcpiGbl_FADT.SciInterrupt)
  668                         acpi_OverrideInterruptLevel(intr->GlobalIrq);
  669                 else
  670                         ioapic_remap_vector(new_ioapic, new_pin,
  671                             intr->SourceIrq);
  672                 if (madt_find_interrupt(intr->SourceIrq, &old_ioapic,
  673                     &old_pin) != 0)
  674                         printf("MADT: Could not find APIC for source IRQ %u\n",
  675                             intr->SourceIrq);
  676                 else if (ioapic_get_vector(old_ioapic, old_pin) ==
  677                     intr->SourceIrq)
  678                         ioapic_disable_pin(old_ioapic, old_pin);
  679         }
  680 
  681         /* Program the polarity and trigger mode. */
  682         ioapic_set_triggermode(new_ioapic, new_pin, trig);
  683         ioapic_set_polarity(new_ioapic, new_pin, pol);
  684 }
  685 
  686 /*
  687  * Parse an entry for an NMI routed to an IO APIC.
  688  */
  689 static void
  690 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi)
  691 {
  692         void *ioapic;
  693         u_int pin;
  694 
  695         if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) {
  696                 printf("MADT: Could not find APIC for vector %u\n",
  697                     nmi->GlobalIrq);
  698                 return;
  699         }
  700 
  701         ioapic_set_nmi(ioapic, pin);
  702         if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
  703                 ioapic_set_triggermode(ioapic, pin,
  704                     interrupt_trigger(nmi->IntiFlags, 0));
  705         if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
  706                 ioapic_set_polarity(ioapic, pin,
  707                     interrupt_polarity(nmi->IntiFlags, 0));
  708 }
  709 
  710 /*
  711  * Parse an entry for an NMI routed to a local APIC LVT pin.
  712  */
  713 static void
  714 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi)
  715 {
  716         u_int apic_id, pin;
  717 
  718         if (nmi->ProcessorId == 0xff)
  719                 apic_id = APIC_ID_ALL;
  720         else if (madt_find_cpu(nmi->ProcessorId, &apic_id) != 0) {
  721                 if (bootverbose)
  722                         printf("MADT: Ignoring local NMI routed to "
  723                             "ACPI CPU %u\n", nmi->ProcessorId);
  724                 return;
  725         }
  726         if (nmi->Lint == 0)
  727                 pin = LVT_LINT0;
  728         else
  729                 pin = LVT_LINT1;
  730         lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
  731         if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS))
  732                 lapic_set_lvt_triggermode(apic_id, pin,
  733                     interrupt_trigger(nmi->IntiFlags, 0));
  734         if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS))
  735                 lapic_set_lvt_polarity(apic_id, pin,
  736                     interrupt_polarity(nmi->IntiFlags, 0));
  737 }
  738 
  739 /*
  740  * Parse interrupt entries.
  741  */
  742 static void
  743 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused)
  744 {
  745 
  746         switch (entry->Type) {
  747         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  748                 madt_parse_interrupt_override(
  749                         (ACPI_MADT_INTERRUPT_OVERRIDE *)entry);
  750                 break;
  751         case ACPI_MADT_TYPE_NMI_SOURCE:
  752                 madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry);
  753                 break;
  754         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
  755                 madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry);
  756                 break;
  757         }
  758 }
  759 
  760 /*
  761  * Setup per-CPU ACPI IDs.
  762  */
  763 static void
  764 madt_set_ids(void *dummy)
  765 {
  766         struct lapic_info *la;
  767         struct pcpu *pc;
  768         u_int i;
  769 
  770         if (madt == NULL)
  771                 return;
  772         for (i = 0; i <= mp_maxid; i++) {
  773                 if (CPU_ABSENT(i))
  774                         continue;
  775                 pc = pcpu_find(i);
  776                 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i));
  777                 la = &lapics[pc->pc_apic_id];
  778                 if (!la->la_enabled)
  779                         panic("APIC: CPU with APIC ID %u is not enabled",
  780                             pc->pc_apic_id);
  781                 pc->pc_acpi_id = la->la_acpi_id;
  782                 if (bootverbose)
  783                         printf("APIC: CPU %u has ACPI ID %u\n", i,
  784                             la->la_acpi_id);
  785         }
  786 }
  787 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_ANY, madt_set_ids, NULL);

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