The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mptable.c

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    1 /*-
    2  * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
    3  * Copyright (c) 1996, by Steve Passe
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. The name of the developer may NOT be used to endorse or promote products
   12  *    derived from this software without specific prior written permission.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include "opt_mptable_force_htt.h"
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 
   37 #include <vm/vm.h>
   38 #include <vm/vm_param.h>
   39 #include <vm/pmap.h>
   40 
   41 #include <machine/apicreg.h>
   42 #include <machine/frame.h>
   43 #include <machine/intr_machdep.h>
   44 #include <machine/apicvar.h>
   45 #include <machine/md_var.h>
   46 #include <machine/mptable.h>
   47 #include <machine/specialreg.h>
   48 
   49 #include <dev/pci/pcivar.h>
   50 
   51 /* string defined by the Intel MP Spec as identifying the MP table */
   52 #define MP_SIG                  0x5f504d5f      /* _MP_ */
   53 
   54 #define MAX_LAPIC_ID            31      /* Max local APIC ID for HTT fixup */
   55 
   56 #ifdef PC98
   57 #define BIOS_BASE               (0xe8000)
   58 #define BIOS_SIZE               (0x18000)
   59 #else
   60 #define BIOS_BASE               (0xf0000)
   61 #define BIOS_SIZE               (0x10000)
   62 #endif
   63 #define BIOS_COUNT              (BIOS_SIZE/4)
   64 
   65 typedef void mptable_entry_handler(u_char *entry, void *arg);
   66 
   67 static basetable_entry basetable_entry_types[] =
   68 {
   69         {0, 20, "Processor"},
   70         {1, 8, "Bus"},
   71         {2, 8, "I/O APIC"},
   72         {3, 8, "I/O INT"},
   73         {4, 8, "Local INT"}
   74 };
   75 
   76 typedef struct BUSDATA {
   77         u_char  bus_id;
   78         enum busTypes bus_type;
   79 }       bus_datum;
   80 
   81 typedef struct INTDATA {
   82         u_char  int_type;
   83         u_short int_flags;
   84         u_char  src_bus_id;
   85         u_char  src_bus_irq;
   86         u_char  dst_apic_id;
   87         u_char  dst_apic_int;
   88         u_char  int_vector;
   89 }       io_int, local_int;
   90 
   91 typedef struct BUSTYPENAME {
   92         u_char  type;
   93         char    name[7];
   94 }       bus_type_name;
   95 
   96 /* From MP spec v1.4, table 4-8. */
   97 static bus_type_name bus_type_table[] =
   98 {
   99         {UNKNOWN_BUSTYPE, "CBUS  "},
  100         {UNKNOWN_BUSTYPE, "CBUSII"},
  101         {EISA, "EISA  "},
  102         {UNKNOWN_BUSTYPE, "FUTURE"},
  103         {UNKNOWN_BUSTYPE, "INTERN"},
  104         {ISA, "ISA   "},
  105         {UNKNOWN_BUSTYPE, "MBI   "},
  106         {UNKNOWN_BUSTYPE, "MBII  "},
  107         {MCA, "MCA   "},
  108         {UNKNOWN_BUSTYPE, "MPI   "},
  109         {UNKNOWN_BUSTYPE, "MPSA  "},
  110         {UNKNOWN_BUSTYPE, "NUBUS "},
  111         {PCI, "PCI   "},
  112         {UNKNOWN_BUSTYPE, "PCMCIA"},
  113         {UNKNOWN_BUSTYPE, "TC    "},
  114         {UNKNOWN_BUSTYPE, "VL    "},
  115         {UNKNOWN_BUSTYPE, "VME   "},
  116         {UNKNOWN_BUSTYPE, "XPRESS"}
  117 };
  118 
  119 /* From MP spec v1.4, table 5-1. */
  120 static int default_data[7][5] =
  121 {
  122 /*   nbus, id0, type0, id1, type1 */
  123         {1, 0, ISA, 255, NOBUS},
  124         {1, 0, EISA, 255, NOBUS},
  125         {1, 0, EISA, 255, NOBUS},
  126         {1, 0, MCA, 255, NOBUS},
  127         {2, 0, ISA, 1, PCI},
  128         {2, 0, EISA, 1, PCI},
  129         {2, 0, MCA, 1, PCI}
  130 };
  131 
  132 struct pci_probe_table_args {
  133         u_char bus;
  134         u_char found;
  135 };
  136 
  137 struct pci_route_interrupt_args {
  138         u_char bus;             /* Source bus. */
  139         u_char irq;             /* Source slot:pin. */
  140         int vector;             /* Return value. */
  141 };
  142 
  143 static mpfps_t mpfps;
  144 static mpcth_t mpct;
  145 static void *ioapics[MAX_APIC_ID + 1];
  146 static bus_datum *busses;
  147 static int mptable_nioapics, mptable_nbusses, mptable_maxbusid;
  148 static int pci0 = -1;
  149 
  150 static MALLOC_DEFINE(M_MPTABLE, "mptable", "MP Table Items");
  151 
  152 static enum intr_polarity conforming_polarity(u_char src_bus,
  153             u_char src_bus_irq);
  154 static enum intr_trigger conforming_trigger(u_char src_bus, u_char src_bus_irq);
  155 static enum intr_polarity intentry_polarity(int_entry_ptr intr);
  156 static enum intr_trigger intentry_trigger(int_entry_ptr intr);
  157 static int      lookup_bus_type(char *name);
  158 static void     mptable_count_items(void);
  159 static void     mptable_count_items_handler(u_char *entry, void *arg);
  160 #ifdef MPTABLE_FORCE_HTT
  161 static void     mptable_hyperthread_fixup(u_int id_mask);
  162 #endif
  163 static void     mptable_parse_apics_and_busses(void);
  164 static void     mptable_parse_apics_and_busses_handler(u_char *entry,
  165     void *arg);
  166 static void     mptable_parse_default_config_ints(void);
  167 static void     mptable_parse_ints(void);
  168 static void     mptable_parse_ints_handler(u_char *entry, void *arg);
  169 static void     mptable_parse_io_int(int_entry_ptr intr);
  170 static void     mptable_parse_local_int(int_entry_ptr intr);
  171 static void     mptable_pci_probe_table_handler(u_char *entry, void *arg);
  172 static void     mptable_pci_route_interrupt_handler(u_char *entry, void *arg);
  173 static void     mptable_pci_setup(void);
  174 static int      mptable_probe(void);
  175 static int      mptable_probe_cpus(void);
  176 static void     mptable_probe_cpus_handler(u_char *entry, void *arg __unused);
  177 static void     mptable_register(void *dummy);
  178 static int      mptable_setup_local(void);
  179 static int      mptable_setup_io(void);
  180 static void     mptable_walk_table(mptable_entry_handler *handler, void *arg);
  181 static int      search_for_sig(u_int32_t target, int count);
  182 
  183 static struct apic_enumerator mptable_enumerator = {
  184         "MPTable",
  185         mptable_probe,
  186         mptable_probe_cpus,
  187         mptable_setup_local,
  188         mptable_setup_io
  189 };
  190 
  191 /*
  192  * look for the MP spec signature
  193  */
  194 
  195 static int
  196 search_for_sig(u_int32_t target, int count)
  197 {
  198         int     x;
  199         u_int32_t *addr = (u_int32_t *) (KERNBASE + target);
  200 
  201         for (x = 0; x < count; x += 4)
  202                 if (addr[x] == MP_SIG)
  203                         /* make array index a byte index */
  204                         return (target + (x * sizeof(u_int32_t)));
  205         return (-1);
  206 }
  207 
  208 static int
  209 lookup_bus_type(char *name)
  210 {
  211         int     x;
  212 
  213         for (x = 0; x < MAX_BUSTYPE; ++x)
  214                 if (strncmp(bus_type_table[x].name, name, 6) == 0)
  215                         return (bus_type_table[x].type);
  216 
  217         return (UNKNOWN_BUSTYPE);
  218 }
  219 
  220 /*
  221  * Look for an Intel MP spec table (ie, SMP capable hardware).
  222  */
  223 static int
  224 mptable_probe(void)
  225 {
  226         int     x;
  227         u_long  segment;
  228         u_int32_t target;
  229 
  230         /* see if EBDA exists */
  231         if ((segment = (u_long) * (u_short *) (KERNBASE + 0x40e)) != 0) {
  232                 /* search first 1K of EBDA */
  233                 target = (u_int32_t) (segment << 4);
  234                 if ((x = search_for_sig(target, 1024 / 4)) >= 0)
  235                         goto found;
  236         } else {
  237                 /* last 1K of base memory, effective 'top of base' passed in */
  238                 target = (u_int32_t) ((basemem * 1024) - 0x400);
  239                 if ((x = search_for_sig(target, 1024 / 4)) >= 0)
  240                         goto found;
  241         }
  242 
  243         /* search the BIOS */
  244         target = (u_int32_t) BIOS_BASE;
  245         if ((x = search_for_sig(target, BIOS_COUNT)) >= 0)
  246                 goto found;
  247 
  248         /* nothing found */
  249         return (ENXIO);
  250 
  251 found:
  252         mpfps = (mpfps_t)(KERNBASE + x);
  253 
  254         /* Map in the configuration table if it exists. */
  255         if (mpfps->config_type != 0) {
  256                 if (bootverbose)
  257                         printf(
  258                 "MP Table version 1.%d found using Default Configuration %d\n",
  259                             mpfps->spec_rev, mpfps->config_type);
  260                 if (mpfps->config_type != 5 && mpfps->config_type != 6) {
  261                         printf(
  262                         "MP Table Default Configuration %d is unsupported\n",
  263                             mpfps->config_type);
  264                         return (ENXIO);
  265                 }
  266                 mpct = NULL;
  267         } else {
  268                 if ((uintptr_t)mpfps->pap >= 1024 * 1024) {
  269                         printf("%s: Unable to map MP Configuration Table\n",
  270                             __func__);
  271                         return (ENXIO);
  272                 }
  273                 mpct = (mpcth_t)(KERNBASE + (uintptr_t)mpfps->pap);
  274                 if (mpct->base_table_length + (uintptr_t)mpfps->pap >=
  275                     1024 * 1024) {
  276                         printf("%s: Unable to map end of MP Config Table\n",
  277                             __func__);
  278                         return (ENXIO);
  279                 }
  280                 if (mpct->signature[0] != 'P' || mpct->signature[1] != 'C' ||
  281                     mpct->signature[2] != 'M' || mpct->signature[3] != 'P') {
  282                         printf("%s: MP Config Table has bad signature: %c%c%c%c\n",
  283                             __func__, mpct->signature[0], mpct->signature[1],
  284                             mpct->signature[2], mpct->signature[3]);
  285                         return (ENXIO);
  286                 }
  287                 if (bootverbose)
  288                         printf(
  289                         "MP Configuration Table version 1.%d found at %p\n",
  290                             mpct->spec_rev, mpct);
  291         }
  292 
  293         return (-100);
  294 }
  295 
  296 /*
  297  * Run through the MP table enumerating CPUs.
  298  */
  299 static int
  300 mptable_probe_cpus(void)
  301 {
  302         u_int cpu_mask;
  303 
  304         /* Is this a pre-defined config? */
  305         if (mpfps->config_type != 0) {
  306                 lapic_create(0, 1);
  307                 lapic_create(1, 0);
  308         } else {
  309                 cpu_mask = 0;
  310                 mptable_walk_table(mptable_probe_cpus_handler, &cpu_mask);
  311 #ifdef MPTABLE_FORCE_HTT
  312                 mptable_hyperthread_fixup(cpu_mask);
  313 #endif
  314         }
  315         return (0);
  316 }
  317 
  318 /*
  319  * Initialize the local APIC on the BSP.
  320  */
  321 static int
  322 mptable_setup_local(void)
  323 {
  324         vm_paddr_t addr;
  325 
  326         /* Is this a pre-defined config? */
  327         printf("MPTable: <");
  328         if (mpfps->config_type != 0) {
  329                 addr = DEFAULT_APIC_BASE;
  330                 printf("Default Configuration %d", mpfps->config_type);
  331         } else {
  332                 addr = mpct->apic_address;
  333                 printf("%.*s %.*s", (int)sizeof(mpct->oem_id), mpct->oem_id,
  334                     (int)sizeof(mpct->product_id), mpct->product_id);
  335         }
  336         printf(">\n");
  337         lapic_init(addr);
  338         return (0);
  339 }
  340 
  341 /*
  342  * Run through the MP table enumerating I/O APICs.
  343  */
  344 static int
  345 mptable_setup_io(void)
  346 {
  347         int i;
  348         u_char byte;
  349 
  350         /* First, we count individual items and allocate arrays. */
  351         mptable_count_items();
  352         busses = malloc((mptable_maxbusid + 1) * sizeof(bus_datum), M_MPTABLE,
  353             M_WAITOK);
  354         for (i = 0; i <= mptable_maxbusid; i++)
  355                 busses[i].bus_type = NOBUS;
  356 
  357         /* Second, we run through adding I/O APIC's and busses. */
  358         mptable_parse_apics_and_busses();       
  359 
  360         /* Third, we run through the table tweaking interrupt sources. */
  361         mptable_parse_ints();
  362 
  363         /* Fourth, we register all the I/O APIC's. */
  364         for (i = 0; i <= MAX_APIC_ID; i++)
  365                 if (ioapics[i] != NULL)
  366                         ioapic_register(ioapics[i]);
  367 
  368         /* Fifth, we setup data structures to handle PCI interrupt routing. */
  369         mptable_pci_setup();
  370 
  371         /* Finally, we throw the switch to enable the I/O APIC's. */
  372         if (mpfps->mpfb2 & MPFB2_IMCR_PRESENT) {
  373                 outb(0x22, 0x70);       /* select IMCR */
  374                 byte = inb(0x23);       /* current contents */
  375                 byte |= 0x01;           /* mask external INTR */
  376                 outb(0x23, byte);       /* disconnect 8259s/NMI */
  377         }
  378 
  379         return (0);
  380 }
  381 
  382 static void
  383 mptable_register(void *dummy __unused)
  384 {
  385 
  386         apic_register_enumerator(&mptable_enumerator);
  387 }
  388 SYSINIT(mptable_register, SI_SUB_CPU - 1, SI_ORDER_FIRST, mptable_register,
  389     NULL);
  390 
  391 /*
  392  * Call the handler routine for each entry in the MP config table.
  393  */
  394 static void
  395 mptable_walk_table(mptable_entry_handler *handler, void *arg)
  396 {
  397         u_int i;
  398         u_char *entry;
  399 
  400         entry = (u_char *)(mpct + 1);
  401         for (i = 0; i < mpct->entry_count; i++) {
  402                 switch (*entry) {
  403                 case MPCT_ENTRY_PROCESSOR:
  404                 case MPCT_ENTRY_IOAPIC:
  405                 case MPCT_ENTRY_BUS:
  406                 case MPCT_ENTRY_INT:
  407                 case MPCT_ENTRY_LOCAL_INT:
  408                         break;
  409                 default:
  410                         panic("%s: Unknown MP Config Entry %d\n", __func__,
  411                             (int)*entry);
  412                 }
  413                 handler(entry, arg);
  414                 entry += basetable_entry_types[*entry].length;
  415         }
  416 }
  417 
  418 static void
  419 mptable_probe_cpus_handler(u_char *entry, void *arg)
  420 {
  421         proc_entry_ptr proc;
  422         u_int *cpu_mask;
  423 
  424         switch (*entry) {
  425         case MPCT_ENTRY_PROCESSOR:
  426                 proc = (proc_entry_ptr)entry;
  427                 if (proc->cpu_flags & PROCENTRY_FLAG_EN) {
  428                         lapic_create(proc->apic_id, proc->cpu_flags &
  429                             PROCENTRY_FLAG_BP);
  430                         if (proc->apic_id < MAX_LAPIC_ID) {
  431                                 cpu_mask = (u_int *)arg;
  432                                 *cpu_mask |= (1ul << proc->apic_id);
  433                         }
  434                 }
  435                 break;
  436         }
  437 }
  438 
  439 static void
  440 mptable_count_items_handler(u_char *entry, void *arg __unused)
  441 {
  442         io_apic_entry_ptr apic;
  443         bus_entry_ptr bus;
  444 
  445         switch (*entry) {
  446         case MPCT_ENTRY_BUS:
  447                 bus = (bus_entry_ptr)entry;
  448                 mptable_nbusses++;
  449                 if (bus->bus_id > mptable_maxbusid)
  450                         mptable_maxbusid = bus->bus_id;
  451                 break;
  452         case MPCT_ENTRY_IOAPIC:
  453                 apic = (io_apic_entry_ptr)entry;
  454                 if (apic->apic_flags & IOAPICENTRY_FLAG_EN)
  455                         mptable_nioapics++;
  456                 break;
  457         }
  458 }
  459 
  460 /*
  461  * Count items in the table.
  462  */
  463 static void
  464 mptable_count_items(void)
  465 {
  466 
  467         /* Is this a pre-defined config? */
  468         if (mpfps->config_type != 0) {
  469                 mptable_nioapics = 1;
  470                 switch (mpfps->config_type) {
  471                 case 1:
  472                 case 2:
  473                 case 3:
  474                 case 4:
  475                         mptable_nbusses = 1;
  476                         break;
  477                 case 5:
  478                 case 6:
  479                 case 7:
  480                         mptable_nbusses = 2;
  481                         break;
  482                 default:
  483                         panic("Unknown pre-defined MP Table config type %d",
  484                             mpfps->config_type);
  485                 }
  486                 mptable_maxbusid = mptable_nbusses - 1;
  487         } else
  488                 mptable_walk_table(mptable_count_items_handler, NULL);
  489 }
  490 
  491 /*
  492  * Add a bus or I/O APIC from an entry in the table.
  493  */
  494 static void
  495 mptable_parse_apics_and_busses_handler(u_char *entry, void *arg __unused)
  496 {
  497         io_apic_entry_ptr apic;
  498         bus_entry_ptr bus;
  499         enum busTypes bus_type;
  500         int i;
  501 
  502 
  503         switch (*entry) {
  504         case MPCT_ENTRY_BUS:
  505                 bus = (bus_entry_ptr)entry;
  506                 bus_type = lookup_bus_type(bus->bus_type);
  507                 if (bus_type == UNKNOWN_BUSTYPE) {
  508                         printf("MPTable: Unknown bus %d type \"", bus->bus_id);
  509                         for (i = 0; i < 6; i++)
  510                                 printf("%c", bus->bus_type[i]);
  511                         printf("\"\n");
  512                 }
  513                 busses[bus->bus_id].bus_id = bus->bus_id;
  514                 busses[bus->bus_id].bus_type = bus_type;
  515                 break;
  516         case MPCT_ENTRY_IOAPIC:
  517                 apic = (io_apic_entry_ptr)entry;
  518                 if (!(apic->apic_flags & IOAPICENTRY_FLAG_EN))
  519                         break;
  520                 if (apic->apic_id > MAX_APIC_ID)
  521                         panic("%s: I/O APIC ID %d too high", __func__,
  522                             apic->apic_id);
  523                 if (ioapics[apic->apic_id] != NULL)
  524                         panic("%s: Double APIC ID %d", __func__,
  525                             apic->apic_id);
  526                 ioapics[apic->apic_id] = ioapic_create(apic->apic_address,
  527                     apic->apic_id, -1);
  528                 break;
  529         default:
  530                 break;
  531         }
  532 }
  533 
  534 /*
  535  * Enumerate I/O APIC's and busses.
  536  */
  537 static void
  538 mptable_parse_apics_and_busses(void)
  539 {
  540 
  541         /* Is this a pre-defined config? */
  542         if (mpfps->config_type != 0) {
  543                 ioapics[2] = ioapic_create(DEFAULT_IO_APIC_BASE, 2, 0);
  544                 busses[0].bus_id = 0;
  545                 busses[0].bus_type = default_data[mpfps->config_type - 1][2];
  546                 if (mptable_nbusses > 1) {
  547                         busses[1].bus_id = 1;
  548                         busses[1].bus_type =
  549                             default_data[mpfps->config_type - 1][4];
  550                 }
  551         } else
  552                 mptable_walk_table(mptable_parse_apics_and_busses_handler,
  553                     NULL);
  554 }
  555 
  556 /*
  557  * Determine conforming polarity for a given bus type.
  558  */
  559 static enum intr_polarity
  560 conforming_polarity(u_char src_bus, u_char src_bus_irq)
  561 {
  562 
  563         KASSERT(src_bus <= mptable_maxbusid, ("bus id %d too large", src_bus));
  564         switch (busses[src_bus].bus_type) {
  565         case ISA:
  566         case EISA:
  567                 return (INTR_POLARITY_HIGH);
  568         case PCI:
  569                 return (INTR_POLARITY_LOW);
  570         default:
  571                 panic("%s: unknown bus type %d", __func__,
  572                     busses[src_bus].bus_type);
  573         }
  574 }
  575 
  576 /*
  577  * Determine conforming trigger for a given bus type.
  578  */
  579 static enum intr_trigger
  580 conforming_trigger(u_char src_bus, u_char src_bus_irq)
  581 {
  582 
  583         KASSERT(src_bus <= mptable_maxbusid, ("bus id %d too large", src_bus));
  584         switch (busses[src_bus].bus_type) {
  585         case ISA:
  586 #ifndef PC98
  587                 if (elcr_found)
  588                         return (elcr_read_trigger(src_bus_irq));
  589                 else
  590 #endif
  591                         return (INTR_TRIGGER_EDGE);
  592         case PCI:
  593                 return (INTR_TRIGGER_LEVEL);
  594 #ifndef PC98
  595         case EISA:
  596                 KASSERT(src_bus_irq < 16, ("Invalid EISA IRQ %d", src_bus_irq));
  597                 KASSERT(elcr_found, ("Missing ELCR"));
  598                 return (elcr_read_trigger(src_bus_irq));
  599 #endif
  600         default:
  601                 panic("%s: unknown bus type %d", __func__,
  602                     busses[src_bus].bus_type);
  603         }
  604 }
  605 
  606 static enum intr_polarity
  607 intentry_polarity(int_entry_ptr intr)
  608 {
  609 
  610         switch (intr->int_flags & INTENTRY_FLAGS_POLARITY) {
  611         case INTENTRY_FLAGS_POLARITY_CONFORM:
  612                 return (conforming_polarity(intr->src_bus_id,
  613                             intr->src_bus_irq));
  614         case INTENTRY_FLAGS_POLARITY_ACTIVEHI:
  615                 return (INTR_POLARITY_HIGH);
  616         case INTENTRY_FLAGS_POLARITY_ACTIVELO:
  617                 return (INTR_POLARITY_LOW);
  618         default:
  619                 panic("Bogus interrupt flags");
  620         }
  621 }
  622 
  623 static enum intr_trigger
  624 intentry_trigger(int_entry_ptr intr)
  625 {
  626 
  627         switch (intr->int_flags & INTENTRY_FLAGS_TRIGGER) {
  628         case INTENTRY_FLAGS_TRIGGER_CONFORM:
  629                 return (conforming_trigger(intr->src_bus_id,
  630                             intr->src_bus_irq));
  631         case INTENTRY_FLAGS_TRIGGER_EDGE:
  632                 return (INTR_TRIGGER_EDGE);
  633         case INTENTRY_FLAGS_TRIGGER_LEVEL:
  634                 return (INTR_TRIGGER_LEVEL);
  635         default:
  636                 panic("Bogus interrupt flags");
  637         }
  638 }
  639 
  640 /*
  641  * Parse an interrupt entry for an I/O interrupt routed to a pin on an I/O APIC.
  642  */
  643 static void
  644 mptable_parse_io_int(int_entry_ptr intr)
  645 {
  646         void *ioapic;
  647         u_int pin, apic_id;
  648 
  649         apic_id = intr->dst_apic_id;
  650         if (intr->dst_apic_id == 0xff) {
  651                 /*
  652                  * An APIC ID of 0xff means that the interrupt is connected
  653                  * to the specified pin on all I/O APICs in the system.  If
  654                  * there is only one I/O APIC, then use that APIC to route
  655                  * the interrupts.  If there is more than one I/O APIC, then
  656                  * punt.
  657                  */
  658                 if (mptable_nioapics == 1) {
  659                         apic_id = 0;
  660                         while (ioapics[apic_id] == NULL)
  661                                 apic_id++;
  662                 } else {
  663                         printf(
  664                         "MPTable: Ignoring global interrupt entry for pin %d\n",
  665                             intr->dst_apic_int);
  666                         return;
  667                 }
  668         }
  669         if (apic_id > MAX_APIC_ID) {
  670                 printf("MPTable: Ignoring interrupt entry for ioapic%d\n",
  671                     intr->dst_apic_id);
  672                 return;
  673         }
  674         ioapic = ioapics[apic_id];
  675         if (ioapic == NULL) {
  676                 printf(
  677         "MPTable: Ignoring interrupt entry for missing ioapic%d\n",
  678                     apic_id);
  679                 return;
  680         }
  681         pin = intr->dst_apic_int;
  682         switch (intr->int_type) {
  683         case INTENTRY_TYPE_INT:
  684                 switch (busses[intr->src_bus_id].bus_type) {
  685                 case NOBUS:
  686                         panic("interrupt from missing bus");
  687                 case ISA:
  688                 case EISA:
  689                         if (busses[intr->src_bus_id].bus_type == ISA)
  690                                 ioapic_set_bus(ioapic, pin, APIC_BUS_ISA);
  691                         else
  692                                 ioapic_set_bus(ioapic, pin, APIC_BUS_EISA);
  693                         if (intr->src_bus_irq == pin)
  694                                 break;
  695                         ioapic_remap_vector(ioapic, pin, intr->src_bus_irq);
  696                         if (ioapic_get_vector(ioapic, intr->src_bus_irq) ==
  697                             intr->src_bus_irq)
  698                                 ioapic_disable_pin(ioapic, intr->src_bus_irq);
  699                         break;
  700                 case PCI:
  701                         ioapic_set_bus(ioapic, pin, APIC_BUS_PCI);
  702                         break;
  703                 default:
  704                         ioapic_set_bus(ioapic, pin, APIC_BUS_UNKNOWN);
  705                         break;
  706                 }
  707                 break;
  708         case INTENTRY_TYPE_NMI:
  709                 ioapic_set_nmi(ioapic, pin);
  710                 break;
  711         case INTENTRY_TYPE_SMI:
  712                 ioapic_set_smi(ioapic, pin);
  713                 break;
  714         case INTENTRY_TYPE_EXTINT:
  715                 ioapic_set_extint(ioapic, pin);
  716                 break;
  717         default:
  718                 panic("%s: invalid interrupt entry type %d\n", __func__,
  719                     intr->int_type);
  720         }
  721         if (intr->int_type == INTENTRY_TYPE_INT ||
  722             (intr->int_flags & INTENTRY_FLAGS_TRIGGER) !=
  723             INTENTRY_FLAGS_TRIGGER_CONFORM)
  724                 ioapic_set_triggermode(ioapic, pin, intentry_trigger(intr));
  725         if (intr->int_type == INTENTRY_TYPE_INT ||
  726             (intr->int_flags & INTENTRY_FLAGS_POLARITY) !=
  727             INTENTRY_FLAGS_POLARITY_CONFORM)
  728                 ioapic_set_polarity(ioapic, pin, intentry_polarity(intr));
  729 }
  730 
  731 /*
  732  * Parse an interrupt entry for a local APIC LVT pin.
  733  */
  734 static void
  735 mptable_parse_local_int(int_entry_ptr intr)
  736 {
  737         u_int apic_id, pin;
  738 
  739         if (intr->dst_apic_id == 0xff)
  740                 apic_id = APIC_ID_ALL;
  741         else
  742                 apic_id = intr->dst_apic_id;
  743         if (intr->dst_apic_int == 0)
  744                 pin = LVT_LINT0;
  745         else
  746                 pin = LVT_LINT1;
  747         switch (intr->int_type) {
  748         case INTENTRY_TYPE_INT:
  749 #if 1
  750                 printf(
  751         "MPTable: Ignoring vectored local interrupt for LINTIN%d vector %d\n",
  752                     intr->dst_apic_int, intr->src_bus_irq);
  753                 return;
  754 #else
  755                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_FIXED);
  756                 break;
  757 #endif
  758         case INTENTRY_TYPE_NMI:
  759                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
  760                 break;
  761         case INTENTRY_TYPE_SMI:
  762                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_SMI);
  763                 break;
  764         case INTENTRY_TYPE_EXTINT:
  765                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_EXTINT);
  766                 break;
  767         default:
  768                 panic("%s: invalid interrupt entry type %d\n", __func__,
  769                     intr->int_type);
  770         }
  771         if ((intr->int_flags & INTENTRY_FLAGS_TRIGGER) !=
  772             INTENTRY_FLAGS_TRIGGER_CONFORM)
  773                 lapic_set_lvt_triggermode(apic_id, pin,
  774                     intentry_trigger(intr));
  775         if ((intr->int_flags & INTENTRY_FLAGS_POLARITY) !=
  776             INTENTRY_FLAGS_POLARITY_CONFORM)
  777                 lapic_set_lvt_polarity(apic_id, pin, intentry_polarity(intr));
  778 }
  779 
  780 /*
  781  * Parse interrupt entries.
  782  */
  783 static void
  784 mptable_parse_ints_handler(u_char *entry, void *arg __unused)
  785 {
  786         int_entry_ptr intr;
  787 
  788         intr = (int_entry_ptr)entry;
  789         switch (*entry) {
  790         case MPCT_ENTRY_INT:
  791                 mptable_parse_io_int(intr);
  792                 break;
  793         case MPCT_ENTRY_LOCAL_INT:
  794                 mptable_parse_local_int(intr);
  795                 break;
  796         }
  797 }
  798 
  799 /*
  800  * Configure interrupt pins for a default configuration.  For details see
  801  * Table 5-2 in Section 5 of the MP Table specification.
  802  */
  803 static void
  804 mptable_parse_default_config_ints(void)
  805 {
  806         struct INTENTRY entry;
  807         int pin;
  808 
  809         /*
  810          * All default configs route IRQs from bus 0 to the first 16 pins
  811          * of the first I/O APIC with an APIC ID of 2.
  812          */
  813         entry.type = MPCT_ENTRY_INT;
  814         entry.int_flags = INTENTRY_FLAGS_POLARITY_CONFORM |
  815             INTENTRY_FLAGS_TRIGGER_CONFORM;
  816         entry.src_bus_id = 0;
  817         entry.dst_apic_id = 2;
  818 
  819         /* Run through all 16 pins. */
  820         for (pin = 0; pin < 16; pin++) {
  821                 entry.dst_apic_int = pin;
  822                 switch (pin) {
  823                 case 0:
  824                         /* Pin 0 is an ExtINT pin. */
  825                         entry.int_type = INTENTRY_TYPE_EXTINT;
  826                         break;
  827                 case 2:
  828                         /* IRQ 0 is routed to pin 2. */
  829                         entry.int_type = INTENTRY_TYPE_INT;
  830                         entry.src_bus_irq = 0;
  831                         break;
  832                 default:
  833                         /* All other pins are identity mapped. */
  834                         entry.int_type = INTENTRY_TYPE_INT;
  835                         entry.src_bus_irq = pin;
  836                         break;
  837                 }
  838                 mptable_parse_io_int(&entry);
  839         }
  840 
  841         /* Certain configs disable certain pins. */
  842         if (mpfps->config_type == 7)
  843                 ioapic_disable_pin(ioapics[2], 0);
  844         if (mpfps->config_type == 2) {
  845                 ioapic_disable_pin(ioapics[2], 2);
  846                 ioapic_disable_pin(ioapics[2], 13);
  847         }
  848 }
  849 
  850 /*
  851  * Configure the interrupt pins
  852  */
  853 static void
  854 mptable_parse_ints(void)
  855 {
  856 
  857         /* Is this a pre-defined config? */
  858         if (mpfps->config_type != 0) {
  859                 /* Configure LINT pins. */
  860                 lapic_set_lvt_mode(APIC_ID_ALL, LVT_LINT0, APIC_LVT_DM_EXTINT);
  861                 lapic_set_lvt_mode(APIC_ID_ALL, LVT_LINT1, APIC_LVT_DM_NMI);
  862 
  863                 /* Configure I/O APIC pins. */
  864                 mptable_parse_default_config_ints();
  865         } else
  866                 mptable_walk_table(mptable_parse_ints_handler, NULL);
  867 }
  868 
  869 #ifdef MPTABLE_FORCE_HTT
  870 /*
  871  * Perform a hyperthreading "fix-up" to enumerate any logical CPU's
  872  * that aren't already listed in the table.
  873  *
  874  * XXX: We assume that all of the physical CPUs in the
  875  * system have the same number of logical CPUs.
  876  *
  877  * XXX: We assume that APIC ID's are allocated such that
  878  * the APIC ID's for a physical processor are aligned
  879  * with the number of logical CPU's in the processor.
  880  */
  881 static void
  882 mptable_hyperthread_fixup(u_int id_mask)
  883 {
  884         u_int i, id, logical_cpus;
  885 
  886         /* Nothing to do if there is no HTT support. */
  887         if ((cpu_feature & CPUID_HTT) == 0)
  888                 return;
  889         logical_cpus = (cpu_procinfo & CPUID_HTT_CORES) >> 16;
  890         if (logical_cpus <= 1)
  891                 return;
  892 
  893         /*
  894          * For each APIC ID of a CPU that is set in the mask,
  895          * scan the other candidate APIC ID's for this
  896          * physical processor.  If any of those ID's are
  897          * already in the table, then kill the fixup.
  898          */
  899         for (id = 0; id <= MAX_LAPIC_ID; id++) {
  900                 if ((id_mask & 1 << id) == 0)
  901                         continue;
  902                 /* First, make sure we are on a logical_cpus boundary. */
  903                 if (id % logical_cpus != 0)
  904                         return;
  905                 for (i = id + 1; i < id + logical_cpus; i++)
  906                         if ((id_mask & 1 << i) != 0)
  907                                 return;
  908         }
  909 
  910         /*
  911          * Ok, the ID's checked out, so perform the fixup by
  912          * adding the logical CPUs.
  913          */
  914         while ((id = ffs(id_mask)) != 0) {
  915                 id--;
  916                 for (i = id + 1; i < id + logical_cpus; i++) {
  917                         if (bootverbose)
  918                                 printf(
  919                         "MPTable: Adding logical CPU %d from main CPU %d\n",
  920                                     i, id);
  921                         lapic_create(i, 0);
  922                 }
  923                 id_mask &= ~(1 << id);
  924         }
  925 }
  926 #endif /* MPTABLE_FORCE_HTT */
  927 
  928 /*
  929  * Support code for routing PCI interrupts using the MP Table.
  930  */
  931 static void
  932 mptable_pci_setup(void)
  933 {
  934         int i;
  935 
  936         /*
  937          * Find the first pci bus and call it 0.  Panic if pci0 is not
  938          * bus zero and there are multiple PCI busses.
  939          */
  940         for (i = 0; i <= mptable_maxbusid; i++)
  941                 if (busses[i].bus_type == PCI) {
  942                         if (pci0 == -1)
  943                                 pci0 = i;
  944                         else if (pci0 != 0)
  945                                 panic(
  946                 "MPTable contains multiple PCI busses but no PCI bus 0");
  947                 }
  948 }
  949 
  950 static void
  951 mptable_pci_probe_table_handler(u_char *entry, void *arg)
  952 {
  953         struct pci_probe_table_args *args;
  954         int_entry_ptr intr;
  955 
  956         if (*entry != MPCT_ENTRY_INT)
  957                 return;
  958         intr = (int_entry_ptr)entry;
  959         args = (struct pci_probe_table_args *)arg;
  960         KASSERT(args->bus <= mptable_maxbusid,
  961             ("bus %d is too big", args->bus));
  962         KASSERT(busses[args->bus].bus_type == PCI, ("probing for non-PCI bus"));
  963         if (intr->src_bus_id == args->bus)
  964                 args->found = 1;
  965 }
  966 
  967 int
  968 mptable_pci_probe_table(int bus)
  969 {
  970         struct pci_probe_table_args args;
  971 
  972         if (bus < 0)
  973                 return (EINVAL);
  974         if (mpct == NULL || pci0 == -1 || pci0 + bus > mptable_maxbusid)
  975                 return (ENXIO);
  976         if (busses[pci0 + bus].bus_type != PCI)
  977                 return (ENXIO);
  978         args.bus = pci0 + bus;
  979         args.found = 0;
  980         mptable_walk_table(mptable_pci_probe_table_handler, &args);
  981         if (args.found == 0)
  982                 return (ENXIO);
  983         return (0);
  984 }
  985 
  986 static void
  987 mptable_pci_route_interrupt_handler(u_char *entry, void *arg)
  988 {
  989         struct pci_route_interrupt_args *args;
  990         int_entry_ptr intr;
  991         int vector;
  992 
  993         if (*entry != MPCT_ENTRY_INT)
  994                 return;
  995         intr = (int_entry_ptr)entry;
  996         args = (struct pci_route_interrupt_args *)arg;
  997         if (intr->src_bus_id != args->bus || intr->src_bus_irq != args->irq)
  998                 return;
  999 
 1000         /* Make sure the APIC maps to a known APIC. */
 1001         KASSERT(ioapics[intr->dst_apic_id] != NULL,
 1002             ("No I/O APIC %d to route interrupt to", intr->dst_apic_id));
 1003 
 1004         /*
 1005          * Look up the vector for this APIC / pin combination.  If we
 1006          * have previously matched an entry for this PCI IRQ but it
 1007          * has the same vector as this entry, just return.  Otherwise,
 1008          * we use the vector for this APIC / pin combination.
 1009          */
 1010         vector = ioapic_get_vector(ioapics[intr->dst_apic_id],
 1011             intr->dst_apic_int);
 1012         if (args->vector == vector)
 1013                 return;
 1014         KASSERT(args->vector == -1,
 1015             ("Multiple IRQs for PCI interrupt %d.%d.INT%c: %d and %d\n",
 1016             args->bus, args->irq >> 2, 'A' + (args->irq & 0x3), args->vector,
 1017             vector));
 1018         args->vector = vector;
 1019 }
 1020 
 1021 int
 1022 mptable_pci_route_interrupt(device_t pcib, device_t dev, int pin)
 1023 {
 1024         struct pci_route_interrupt_args args;
 1025         int slot;
 1026 
 1027         /* Like ACPI, pin numbers are 0-3, not 1-4. */
 1028         pin--;
 1029         KASSERT(pci0 != -1, ("do not know how to route PCI interrupts"));
 1030         args.bus = pci_get_bus(dev) + pci0;
 1031         slot = pci_get_slot(dev);
 1032 
 1033         /*
 1034          * PCI interrupt entries in the MP Table encode both the slot and
 1035          * pin into the IRQ with the pin being the two least significant
 1036          * bits, the slot being the next five bits, and the most significant
 1037          * bit being reserved.
 1038          */
 1039         args.irq = slot << 2 | pin;
 1040         args.vector = -1;
 1041         mptable_walk_table(mptable_pci_route_interrupt_handler, &args);
 1042         if (args.vector < 0) {
 1043                 device_printf(pcib, "unable to route slot %d INT%c\n", slot,
 1044                     'A' + pin);
 1045                 return (PCI_INVALID_IRQ);
 1046         }
 1047         if (bootverbose)
 1048                 device_printf(pcib, "slot %d INT%c routed to irq %d\n", slot,
 1049                     'A' + pin, args.vector);
 1050         return (args.vector);
 1051 }

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