The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/amd64/amd64/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: releng/5.3/sys/amd64/amd64/mptable.c 131778 2004-07-08 01:42:49Z peter $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 
   36 #include <vm/vm.h>
   37 #include <vm/vm_param.h>
   38 #include <vm/pmap.h>
   39 
   40 #include <machine/apicreg.h>
   41 #include <machine/frame.h>
   42 #include <machine/intr_machdep.h>
   43 #include <machine/apicvar.h>
   44 #include <machine/md_var.h>
   45 #include <machine/mptable.h>
   46 #include <machine/specialreg.h>
   47 
   48 #include <dev/pci/pcivar.h>
   49 
   50 /* string defined by the Intel MP Spec as identifying the MP table */
   51 #define MP_SIG                  0x5f504d5f      /* _MP_ */
   52 
   53 #define NAPICID                 32      /* Max number of APIC's */
   54 
   55 #define BIOS_BASE               (0xf0000)
   56 #define BIOS_SIZE               (0x10000)
   57 #define BIOS_COUNT              (BIOS_SIZE/4)
   58 
   59 typedef void mptable_entry_handler(u_char *entry, void *arg);
   60 
   61 static basetable_entry basetable_entry_types[] =
   62 {
   63         {0, 20, "Processor"},
   64         {1, 8, "Bus"},
   65         {2, 8, "I/O APIC"},
   66         {3, 8, "I/O INT"},
   67         {4, 8, "Local INT"}
   68 };
   69 
   70 typedef struct BUSDATA {
   71         u_char  bus_id;
   72         enum busTypes bus_type;
   73 }       bus_datum;
   74 
   75 typedef struct INTDATA {
   76         u_char  int_type;
   77         u_short int_flags;
   78         u_char  src_bus_id;
   79         u_char  src_bus_irq;
   80         u_char  dst_apic_id;
   81         u_char  dst_apic_int;
   82         u_char  int_vector;
   83 }       io_int, local_int;
   84 
   85 typedef struct BUSTYPENAME {
   86         u_char  type;
   87         char    name[7];
   88 }       bus_type_name;
   89 
   90 /* From MP spec v1.4, table 4-8. */
   91 static bus_type_name bus_type_table[] =
   92 {
   93         {UNKNOWN_BUSTYPE, "CBUS  "},
   94         {UNKNOWN_BUSTYPE, "CBUSII"},
   95         {EISA, "EISA  "},
   96         {UNKNOWN_BUSTYPE, "FUTURE"},
   97         {UNKNOWN_BUSTYPE, "INTERN"},
   98         {ISA, "ISA   "},
   99         {UNKNOWN_BUSTYPE, "MBI   "},
  100         {UNKNOWN_BUSTYPE, "MBII  "},
  101         {MCA, "MCA   "},
  102         {UNKNOWN_BUSTYPE, "MPI   "},
  103         {UNKNOWN_BUSTYPE, "MPSA  "},
  104         {UNKNOWN_BUSTYPE, "NUBUS "},
  105         {PCI, "PCI   "},
  106         {UNKNOWN_BUSTYPE, "PCMCIA"},
  107         {UNKNOWN_BUSTYPE, "TC    "},
  108         {UNKNOWN_BUSTYPE, "VL    "},
  109         {UNKNOWN_BUSTYPE, "VME   "},
  110         {UNKNOWN_BUSTYPE, "XPRESS"}
  111 };
  112 
  113 /* From MP spec v1.4, table 5-1. */
  114 static int default_data[7][5] =
  115 {
  116 /*   nbus, id0, type0, id1, type1 */
  117         {1, 0, ISA, 255, NOBUS},
  118         {1, 0, EISA, 255, NOBUS},
  119         {1, 0, EISA, 255, NOBUS},
  120         {1, 0, MCA, 255, NOBUS},
  121         {2, 0, ISA, 1, PCI},
  122         {2, 0, EISA, 1, PCI},
  123         {2, 0, MCA, 1, PCI}
  124 };
  125 
  126 struct pci_probe_table_args {
  127         u_char bus;
  128         u_char found;
  129 };
  130 
  131 struct pci_route_interrupt_args {
  132         u_char bus;             /* Source bus. */
  133         u_char irq;             /* Source slot:pin. */
  134         int vector;             /* Return value. */
  135 };
  136 
  137 static mpfps_t mpfps;
  138 static mpcth_t mpct;
  139 static void *ioapics[NAPICID];
  140 static bus_datum *busses;
  141 static int mptable_nioapics, mptable_nbusses, mptable_maxbusid;
  142 static int pci0 = -1;
  143 
  144 MALLOC_DEFINE(M_MPTABLE, "MP Table", "MP Table Items");
  145 
  146 static enum intr_polarity conforming_polarity(u_char src_bus,
  147             u_char src_bus_irq);
  148 static enum intr_trigger conforming_trigger(u_char src_bus, u_char src_bus_irq);
  149 static enum intr_polarity intentry_polarity(int_entry_ptr intr);
  150 static enum intr_trigger intentry_trigger(int_entry_ptr intr);
  151 static int      lookup_bus_type(char *name);
  152 static void     mptable_count_items(void);
  153 static void     mptable_count_items_handler(u_char *entry, void *arg);
  154 #ifdef MPTABLE_FORCE_HTT
  155 static void     mptable_hyperthread_fixup(u_int id_mask);
  156 #endif
  157 static void     mptable_parse_apics_and_busses(void);
  158 static void     mptable_parse_apics_and_busses_handler(u_char *entry,
  159     void *arg);
  160 static void     mptable_parse_ints(void);
  161 static void     mptable_parse_ints_handler(u_char *entry, void *arg);
  162 static void     mptable_parse_io_int(int_entry_ptr intr);
  163 static void     mptable_parse_local_int(int_entry_ptr intr);
  164 static void     mptable_pci_probe_table_handler(u_char *entry, void *arg);
  165 static void     mptable_pci_route_interrupt_handler(u_char *entry, void *arg);
  166 static void     mptable_pci_setup(void);
  167 static int      mptable_probe(void);
  168 static int      mptable_probe_cpus(void);
  169 static void     mptable_probe_cpus_handler(u_char *entry, void *arg __unused);
  170 static void     mptable_register(void *dummy);
  171 static int      mptable_setup_local(void);
  172 static int      mptable_setup_io(void);
  173 static void     mptable_walk_table(mptable_entry_handler *handler, void *arg);
  174 static int      search_for_sig(u_int32_t target, int count);
  175 
  176 static struct apic_enumerator mptable_enumerator = {
  177         "MPTable",
  178         mptable_probe,
  179         mptable_probe_cpus,
  180         mptable_setup_local,
  181         mptable_setup_io
  182 };
  183 
  184 /*
  185  * look for the MP spec signature
  186  */
  187 
  188 static int
  189 search_for_sig(u_int32_t target, int count)
  190 {
  191         int     x;
  192         u_int32_t *addr = (u_int32_t *) (KERNBASE + target);
  193 
  194         for (x = 0; x < count; x += 4)
  195                 if (addr[x] == MP_SIG)
  196                         /* make array index a byte index */
  197                         return (target + (x * sizeof(u_int32_t)));
  198         return (-1);
  199 }
  200 
  201 static int
  202 lookup_bus_type(char *name)
  203 {
  204         int     x;
  205 
  206         for (x = 0; x < MAX_BUSTYPE; ++x)
  207                 if (strncmp(bus_type_table[x].name, name, 6) == 0)
  208                         return (bus_type_table[x].type);
  209 
  210         return (UNKNOWN_BUSTYPE);
  211 }
  212 
  213 /*
  214  * Look for an Intel MP spec table (ie, SMP capable hardware).
  215  */
  216 static int
  217 mptable_probe(void)
  218 {
  219         int     x;
  220         u_int32_t segment;
  221         u_int32_t target;
  222 
  223         /* see if EBDA exists */
  224         segment = (u_int32_t) *(u_short *)(KERNBASE + 0x40e);
  225         if (segment != 0) {
  226                 /* search first 1K of EBDA */
  227                 target = (u_int32_t) (segment << 4);
  228                 if ((x = search_for_sig(target, 1024 / 4)) >= 0)
  229                         goto found;
  230         } else {
  231                 /* last 1K of base memory, effective 'top of base' passed in */
  232                 target = (u_int32_t) ((basemem * 1024) - 0x400);
  233                 if ((x = search_for_sig(target, 1024 / 4)) >= 0)
  234                         goto found;
  235         }
  236 
  237         /* search the BIOS */
  238         target = (u_int32_t) BIOS_BASE;
  239         if ((x = search_for_sig(target, BIOS_COUNT)) >= 0)
  240                 goto found;
  241 
  242         /* nothing found */
  243         return (ENXIO);
  244 
  245 found:
  246         mpfps = (mpfps_t)(KERNBASE + x);
  247 
  248         /* Map in the configuration table if it exists. */
  249         if (mpfps->config_type != 0)
  250                 mpct = NULL;
  251         else {
  252                 if ((uintptr_t)mpfps->pap >= 1024 * 1024) {
  253                         printf("%s: Unable to map MP Configuration Table\n",
  254                             __func__);
  255                         return (ENXIO);
  256                 }
  257                 mpct = (mpcth_t)(KERNBASE + (uintptr_t)mpfps->pap);
  258                 if (mpct->base_table_length + (uintptr_t)mpfps->pap >=
  259                     1024 * 1024) {
  260                         printf("%s: Unable to map end of MP Config Table\n",
  261                             __func__);
  262                         return (ENXIO);
  263                 }
  264                 if (mpct->signature[0] != 'P' || mpct->signature[1] != 'C' ||
  265                     mpct->signature[2] != 'M' || mpct->signature[3] != 'P') {
  266                         printf("%s: MP Config Table has bad signature: %c%c%c%c\n",
  267                             __func__, mpct->signature[0], mpct->signature[1],
  268                             mpct->signature[2], mpct->signature[3]);
  269                         return (ENXIO);
  270                 }
  271                 if (bootverbose)
  272                         printf(
  273                         "MP Configuration Table version 1.%d found at %p\n",
  274                             mpct->spec_rev, mpct);
  275         }
  276 
  277         return (-100);
  278 }
  279 
  280 /*
  281  * Run through the MP table enumerating CPUs.
  282  */
  283 static int
  284 mptable_probe_cpus(void)
  285 {
  286         u_int cpu_mask;
  287 
  288         /* Is this a pre-defined config? */
  289         if (mpfps->config_type != 0) {
  290                 lapic_create(0, 1);
  291                 lapic_create(1, 0);
  292         } else {
  293                 cpu_mask = 0;
  294                 mptable_walk_table(mptable_probe_cpus_handler, &cpu_mask);
  295 #ifdef MPTABLE_FORCE_HTT
  296                 mptable_hyperthread_fixup(cpu_mask);
  297 #endif
  298         }
  299         return (0);
  300 }
  301 
  302 /*
  303  * Initialize the local APIC on the BSP.
  304  */
  305 static int
  306 mptable_setup_local(void)
  307 {
  308 
  309         /* Is this a pre-defined config? */
  310         printf("MPTable: <");
  311         if (mpfps->config_type != 0) {
  312                 lapic_init(DEFAULT_APIC_BASE);
  313                 printf("Preset Config %d", mpfps->config_type);
  314         } else {
  315                 lapic_init((uintptr_t)mpct->apic_address);
  316                 printf("%.*s %.*s", (int)sizeof(mpct->oem_id), mpct->oem_id,
  317                     (int)sizeof(mpct->product_id), mpct->product_id);
  318         }
  319         printf(">\n");
  320         return (0);
  321 }
  322 
  323 /*
  324  * Run through the MP table enumerating I/O APICs.
  325  */
  326 static int
  327 mptable_setup_io(void)
  328 {
  329         int i;
  330         u_char byte;
  331 
  332         /* First, we count individual items and allocate arrays. */
  333         mptable_count_items();
  334         busses = malloc((mptable_maxbusid + 1) * sizeof(bus_datum), M_MPTABLE,
  335             M_WAITOK);
  336         for (i = 0; i <= mptable_maxbusid; i++)
  337                 busses[i].bus_type = NOBUS;
  338 
  339         /* Second, we run through adding I/O APIC's and busses. */
  340         ioapic_enable_mixed_mode();
  341         mptable_parse_apics_and_busses();       
  342 
  343         /* Third, we run through the table tweaking interrupt sources. */
  344         mptable_parse_ints();
  345 
  346         /* Fourth, we register all the I/O APIC's. */
  347         for (i = 0; i < NAPICID; i++)
  348                 if (ioapics[i] != NULL)
  349                         ioapic_register(ioapics[i]);
  350 
  351         /* Fifth, we setup data structures to handle PCI interrupt routing. */
  352         mptable_pci_setup();
  353 
  354         /* Finally, we throw the switch to enable the I/O APIC's. */
  355         if (mpfps->mpfb2 & MPFB2_IMCR_PRESENT) {
  356                 outb(0x22, 0x70);       /* select IMCR */
  357                 byte = inb(0x23);       /* current contents */
  358                 byte |= 0x01;           /* mask external INTR */
  359                 outb(0x23, byte);       /* disconnect 8259s/NMI */
  360         }
  361 
  362         return (0);
  363 }
  364 
  365 static void
  366 mptable_register(void *dummy __unused)
  367 {
  368 
  369         apic_register_enumerator(&mptable_enumerator);
  370 }
  371 SYSINIT(mptable_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST,
  372     mptable_register, NULL)
  373 
  374 /*
  375  * Call the handler routine for each entry in the MP config table.
  376  */
  377 static void
  378 mptable_walk_table(mptable_entry_handler *handler, void *arg)
  379 {
  380         u_int i;
  381         u_char *entry;
  382 
  383         entry = (u_char *)(mpct + 1);
  384         for (i = 0; i < mpct->entry_count; i++) {
  385                 switch (*entry) {
  386                 case MPCT_ENTRY_PROCESSOR:
  387                 case MPCT_ENTRY_IOAPIC:
  388                 case MPCT_ENTRY_BUS:
  389                 case MPCT_ENTRY_INT:
  390                 case MPCT_ENTRY_LOCAL_INT:
  391                         break;
  392                 default:
  393                         panic("%s: Unknown MP Config Entry %d\n", __func__,
  394                             (int)*entry);
  395                 }
  396                 handler(entry, arg);
  397                 entry += basetable_entry_types[*entry].length;
  398         }
  399 }
  400 
  401 static void
  402 mptable_probe_cpus_handler(u_char *entry, void *arg)
  403 {
  404         proc_entry_ptr proc;
  405         u_int *cpu_mask;
  406 
  407         switch (*entry) {
  408         case MPCT_ENTRY_PROCESSOR:
  409                 proc = (proc_entry_ptr)entry;
  410                 if (proc->cpu_flags & PROCENTRY_FLAG_EN) {
  411                         lapic_create(proc->apic_id, proc->cpu_flags &
  412                             PROCENTRY_FLAG_BP);
  413                         cpu_mask = (u_int *)arg;
  414                         *cpu_mask |= (1 << proc->apic_id);
  415                 }
  416                 break;
  417         }
  418 }
  419 
  420 static void
  421 mptable_count_items_handler(u_char *entry, void *arg __unused)
  422 {
  423         io_apic_entry_ptr apic;
  424         bus_entry_ptr bus;
  425 
  426         switch (*entry) {
  427         case MPCT_ENTRY_BUS:
  428                 bus = (bus_entry_ptr)entry;
  429                 mptable_nbusses++;
  430                 if (bus->bus_id > mptable_maxbusid)
  431                         mptable_maxbusid = bus->bus_id;
  432                 break;
  433         case MPCT_ENTRY_IOAPIC:
  434                 apic = (io_apic_entry_ptr)entry;
  435                 if (apic->apic_flags & IOAPICENTRY_FLAG_EN)
  436                         mptable_nioapics++;
  437                 break;
  438         }
  439 }
  440 
  441 /*
  442  * Count items in the table.
  443  */
  444 static void
  445 mptable_count_items(void)
  446 {
  447 
  448         /* Is this a pre-defined config? */
  449         if (mpfps->config_type != 0) {
  450                 mptable_nioapics = 1;
  451                 switch (mpfps->config_type) {
  452                 case 1:
  453                 case 2:
  454                 case 3:
  455                 case 4:
  456                         mptable_nbusses = 1;
  457                         break;
  458                 case 5:
  459                 case 6:
  460                 case 7:
  461                         mptable_nbusses = 2;
  462                         break;
  463                 default:
  464                         panic("Unknown pre-defined MP Table config type %d",
  465                             mpfps->config_type);
  466                 }
  467                 mptable_maxbusid = mptable_nbusses - 1;
  468         } else
  469                 mptable_walk_table(mptable_count_items_handler, NULL);
  470 }
  471 
  472 /*
  473  * Add a bus or I/O APIC from an entry in the table.
  474  */
  475 static void
  476 mptable_parse_apics_and_busses_handler(u_char *entry, void *arg __unused)
  477 {
  478         io_apic_entry_ptr apic;
  479         bus_entry_ptr bus;
  480         enum busTypes bus_type;
  481         int i;
  482 
  483 
  484         switch (*entry) {
  485         case MPCT_ENTRY_BUS:
  486                 bus = (bus_entry_ptr)entry;
  487                 bus_type = lookup_bus_type(bus->bus_type);
  488                 if (bus_type == UNKNOWN_BUSTYPE) {
  489                         printf("MPTable: Unknown bus %d type \"", bus->bus_id);
  490                         for (i = 0; i < 6; i++)
  491                                 printf("%c", bus->bus_type[i]);
  492                         printf("\"\n");
  493                 }
  494                 busses[bus->bus_id].bus_id = bus->bus_id;
  495                 busses[bus->bus_id].bus_type = bus_type;
  496                 break;
  497         case MPCT_ENTRY_IOAPIC:
  498                 apic = (io_apic_entry_ptr)entry;
  499                 if (!(apic->apic_flags & IOAPICENTRY_FLAG_EN))
  500                         break;
  501                 if (apic->apic_id >= NAPICID)
  502                         panic("%s: I/O APIC ID %d too high", __func__,
  503                             apic->apic_id);
  504                 if (ioapics[apic->apic_id] != NULL)
  505                         panic("%s: Double APIC ID %d", __func__,
  506                             apic->apic_id);
  507                 ioapics[apic->apic_id] = ioapic_create(
  508                         (uintptr_t)apic->apic_address, apic->apic_id, -1);
  509                 break;
  510         default:
  511                 break;
  512         }
  513 }
  514 
  515 /*
  516  * Enumerate I/O APIC's and busses.
  517  */
  518 static void
  519 mptable_parse_apics_and_busses(void)
  520 {
  521 
  522         /* Is this a pre-defined config? */
  523         if (mpfps->config_type != 0) {
  524                 ioapics[0] = ioapic_create(DEFAULT_IO_APIC_BASE, 2, 0);
  525                 busses[0].bus_id = 0;
  526                 busses[0].bus_type = default_data[mpfps->config_type][2];
  527                 if (mptable_nbusses > 1) {
  528                         busses[1].bus_id = 1;
  529                         busses[1].bus_type =
  530                             default_data[mpfps->config_type][4];
  531                 }
  532         } else
  533                 mptable_walk_table(mptable_parse_apics_and_busses_handler,
  534                     NULL);
  535 }
  536 
  537 /*
  538  * Determine conforming polarity for a given bus type.
  539  */
  540 static enum intr_polarity
  541 conforming_polarity(u_char src_bus, u_char src_bus_irq)
  542 {
  543 
  544         KASSERT(src_bus <= mptable_maxbusid, ("bus id %d too large", src_bus));
  545         switch (busses[src_bus].bus_type) {
  546         case ISA:
  547         case EISA:
  548                 return (INTR_POLARITY_HIGH);
  549         case PCI:
  550                 return (INTR_POLARITY_LOW);
  551         default:
  552                 panic("%s: unknown bus type %d", __func__,
  553                     busses[src_bus].bus_type);
  554         }
  555 }
  556 
  557 /*
  558  * Determine conforming trigger for a given bus type.
  559  */
  560 static enum intr_trigger
  561 conforming_trigger(u_char src_bus, u_char src_bus_irq)
  562 {
  563 
  564         KASSERT(src_bus <= mptable_maxbusid, ("bus id %d too large", src_bus));
  565         switch (busses[src_bus].bus_type) {
  566         case ISA:
  567                 return (INTR_TRIGGER_EDGE);
  568         case PCI:
  569                 return (INTR_TRIGGER_LEVEL);
  570         case EISA:
  571                 KASSERT(src_bus_irq < 16, ("Invalid EISA IRQ %d", src_bus_irq));
  572                 return (elcr_read_trigger(src_bus_irq));
  573         default:
  574                 panic("%s: unknown bus type %d", __func__,
  575                     busses[src_bus].bus_type);
  576         }
  577 }
  578 
  579 static enum intr_polarity
  580 intentry_polarity(int_entry_ptr intr)
  581 {
  582 
  583         switch (intr->int_flags & INTENTRY_FLAGS_POLARITY) {
  584         case INTENTRY_FLAGS_POLARITY_CONFORM:
  585                 return (conforming_polarity(intr->src_bus_id,
  586                             intr->src_bus_irq));
  587         case INTENTRY_FLAGS_POLARITY_ACTIVEHI:
  588                 return (INTR_POLARITY_HIGH);
  589         case INTENTRY_FLAGS_POLARITY_ACTIVELO:
  590                 return (INTR_POLARITY_LOW);
  591         default:
  592                 panic("Bogus interrupt flags");
  593         }
  594 }
  595 
  596 static enum intr_trigger
  597 intentry_trigger(int_entry_ptr intr)
  598 {
  599 
  600         switch (intr->int_flags & INTENTRY_FLAGS_TRIGGER) {
  601         case INTENTRY_FLAGS_TRIGGER_CONFORM:
  602                 return (conforming_trigger(intr->src_bus_id,
  603                             intr->src_bus_irq));
  604         case INTENTRY_FLAGS_TRIGGER_EDGE:
  605                 return (INTR_TRIGGER_EDGE);
  606         case INTENTRY_FLAGS_TRIGGER_LEVEL:
  607                 return (INTR_TRIGGER_LEVEL);
  608         default:
  609                 panic("Bogus interrupt flags");
  610         }
  611 }
  612 
  613 /*
  614  * Parse an interrupt entry for an I/O interrupt routed to a pin on an I/O APIC.
  615  */
  616 static void
  617 mptable_parse_io_int(int_entry_ptr intr)
  618 {
  619         void *ioapic;
  620         u_int pin;
  621 
  622         if (intr->dst_apic_id == 0xff) {
  623                 printf("MPTable: Ignoring global interrupt entry for pin %d\n",
  624                     intr->dst_apic_int);
  625                 return;
  626         }
  627         if (intr->dst_apic_id >= NAPICID) {
  628                 printf("MPTable: Ignoring interrupt entry for ioapic%d\n",
  629                     intr->dst_apic_id);
  630                 return;
  631         }
  632         ioapic = ioapics[intr->dst_apic_id];
  633         if (ioapic == NULL) {
  634                 printf(
  635         "MPTable: Ignoring interrupt entry for missing ioapic%d\n",
  636                     intr->dst_apic_id);
  637                 return;
  638         }
  639         pin = intr->dst_apic_int;
  640         switch (intr->int_type) {
  641         case INTENTRY_TYPE_INT:
  642                 switch (busses[intr->src_bus_id].bus_type) {
  643                 case NOBUS:
  644                         panic("interrupt from missing bus");
  645                 case ISA:
  646                 case EISA:
  647                         if (busses[intr->src_bus_id].bus_type == ISA)
  648                                 ioapic_set_bus(ioapic, pin, APIC_BUS_ISA);
  649                         else
  650                                 ioapic_set_bus(ioapic, pin, APIC_BUS_EISA);
  651                         if (intr->src_bus_irq == pin)
  652                                 break;
  653                         ioapic_remap_vector(ioapic, pin, intr->src_bus_irq);
  654                         if (ioapic_get_vector(ioapic, intr->src_bus_irq) ==
  655                             intr->src_bus_irq)
  656                                 ioapic_disable_pin(ioapic, intr->src_bus_irq);
  657                         break;
  658                 case PCI:
  659                         ioapic_set_bus(ioapic, pin, APIC_BUS_PCI);
  660                         break;
  661                 default:
  662                         ioapic_set_bus(ioapic, pin, APIC_BUS_UNKNOWN);
  663                         break;
  664                 }
  665                 break;
  666         case INTENTRY_TYPE_NMI:
  667                 ioapic_set_nmi(ioapic, pin);
  668                 break;
  669         case INTENTRY_TYPE_SMI:
  670                 ioapic_set_smi(ioapic, pin);
  671                 break;
  672         case INTENTRY_TYPE_EXTINT:
  673                 ioapic_set_extint(ioapic, pin);
  674                 break;
  675         default:
  676                 panic("%s: invalid interrupt entry type %d\n", __func__,
  677                     intr->int_type);
  678         }
  679         if (intr->int_type == INTENTRY_TYPE_INT ||
  680             (intr->int_flags & INTENTRY_FLAGS_TRIGGER) !=
  681             INTENTRY_FLAGS_TRIGGER_CONFORM)
  682                 ioapic_set_triggermode(ioapic, pin, intentry_trigger(intr));
  683         if (intr->int_type == INTENTRY_TYPE_INT ||
  684             (intr->int_flags & INTENTRY_FLAGS_POLARITY) !=
  685             INTENTRY_FLAGS_POLARITY_CONFORM)
  686                 ioapic_set_polarity(ioapic, pin, intentry_polarity(intr));
  687 }
  688 
  689 /*
  690  * Parse an interrupt entry for a local APIC LVT pin.
  691  */
  692 static void
  693 mptable_parse_local_int(int_entry_ptr intr)
  694 {
  695         u_int apic_id, pin;
  696 
  697         if (intr->dst_apic_id == 0xff)
  698                 apic_id = APIC_ID_ALL;
  699         else
  700                 apic_id = intr->dst_apic_id;
  701         if (intr->dst_apic_int == 0)
  702                 pin = LVT_LINT0;
  703         else
  704                 pin = LVT_LINT1;
  705         switch (intr->int_type) {
  706         case INTENTRY_TYPE_INT:
  707 #if 1
  708                 printf(
  709         "MPTable: Ignoring vectored local interrupt for LINTIN%d vector %d\n",
  710                     intr->dst_apic_int, intr->src_bus_irq);
  711                 return;
  712 #else
  713                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_FIXED);
  714                 break;
  715 #endif
  716         case INTENTRY_TYPE_NMI:
  717                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI);
  718                 break;
  719         case INTENTRY_TYPE_SMI:
  720                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_SMI);
  721                 break;
  722         case INTENTRY_TYPE_EXTINT:
  723                 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_EXTINT);
  724                 break;
  725         default:
  726                 panic("%s: invalid interrupt entry type %d\n", __func__,
  727                     intr->int_type);
  728         }
  729         if ((intr->int_flags & INTENTRY_FLAGS_TRIGGER) !=
  730             INTENTRY_FLAGS_TRIGGER_CONFORM)
  731                 lapic_set_lvt_triggermode(apic_id, pin,
  732                     intentry_trigger(intr));
  733         if ((intr->int_flags & INTENTRY_FLAGS_POLARITY) !=
  734             INTENTRY_FLAGS_POLARITY_CONFORM)
  735                 lapic_set_lvt_polarity(apic_id, pin, intentry_polarity(intr));
  736 }
  737 
  738 /*
  739  * Parse interrupt entries.
  740  */
  741 static void
  742 mptable_parse_ints_handler(u_char *entry, void *arg __unused)
  743 {
  744         int_entry_ptr intr;
  745 
  746         intr = (int_entry_ptr)entry;
  747         switch (*entry) {
  748         case MPCT_ENTRY_INT:
  749                 mptable_parse_io_int(intr);
  750                 break;
  751         case MPCT_ENTRY_LOCAL_INT:
  752                 mptable_parse_local_int(intr);
  753                 break;
  754         }
  755 }
  756         
  757 /*
  758  * Configure the interrupt pins
  759  */
  760 static void
  761 mptable_parse_ints(void)
  762 {
  763 
  764         /* Is this a pre-defined config? */
  765         if (mpfps->config_type != 0) {
  766                 /* Configure LINT pins. */
  767                 lapic_set_lvt_mode(APIC_ID_ALL, LVT_LINT0, APIC_LVT_DM_EXTINT);
  768                 lapic_set_lvt_mode(APIC_ID_ALL, LVT_LINT1, APIC_LVT_DM_NMI);
  769 
  770                 /* Configure I/O APIC pins. */
  771                 if (mpfps->config_type != 7)
  772                         ioapic_set_extint(ioapics[0], 0);
  773                 else
  774                         ioapic_disable_pin(ioapics[0], 0);
  775                 if (mpfps->config_type != 2)
  776                         ioapic_remap_vector(ioapics[0], 2, 0);
  777                 else
  778                         ioapic_disable_pin(ioapics[0], 2);
  779                 if (mpfps->config_type == 2)
  780                         ioapic_disable_pin(ioapics[0], 13);
  781         } else
  782                 mptable_walk_table(mptable_parse_ints_handler, NULL);
  783 }
  784 
  785 #ifdef MPTABLE_FORCE_HTT
  786 /*
  787  * Perform a hyperthreading "fix-up" to enumerate any logical CPU's
  788  * that aren't already listed in the table.
  789  *
  790  * XXX: We assume that all of the physical CPUs in the
  791  * system have the same number of logical CPUs.
  792  *
  793  * XXX: We assume that APIC ID's are allocated such that
  794  * the APIC ID's for a physical processor are aligned
  795  * with the number of logical CPU's in the processor.
  796  */
  797 static void
  798 mptable_hyperthread_fixup(u_int id_mask)
  799 {
  800         u_int i, id, logical_cpus;
  801 
  802         /* Nothing to do if there is no HTT support. */
  803         if ((cpu_feature & CPUID_HTT) == 0)
  804                 return;
  805         logical_cpus = (cpu_procinfo & CPUID_HTT_CORES) >> 16;
  806         if (logical_cpus <= 1)
  807                 return;
  808 
  809         /*
  810          * For each APIC ID of a CPU that is set in the mask,
  811          * scan the other candidate APIC ID's for this
  812          * physical processor.  If any of those ID's are
  813          * already in the table, then kill the fixup.
  814          */
  815         for (id = 0; id < NAPICID; id++) {
  816                 if ((id_mask & 1 << id) == 0)
  817                         continue;
  818                 /* First, make sure we are on a logical_cpus boundary. */
  819                 if (id % logical_cpus != 0)
  820                         return;
  821                 for (i = id + 1; i < id + logical_cpus; i++)
  822                         if ((id_mask & 1 << i) != 0)
  823                                 return;
  824         }
  825 
  826         /*
  827          * Ok, the ID's checked out, so perform the fixup by
  828          * adding the logical CPUs.
  829          */
  830         while ((id = ffs(id_mask)) != 0) {
  831                 id--;
  832                 for (i = id + 1; i < id + logical_cpus; i++) {
  833                         if (bootverbose)
  834                                 printf(
  835                         "MPTable: Adding logical CPU %d from main CPU %d\n",
  836                                     i, id);
  837                         lapic_create(i, 0);
  838                 }
  839                 id_mask &= ~(1 << id);
  840         }
  841 }
  842 #endif /* MPTABLE_FORCE_HTT */
  843 
  844 /*
  845  * Support code for routing PCI interrupts using the MP Table.
  846  */
  847 static void
  848 mptable_pci_setup(void)
  849 {
  850         int i;
  851 
  852         /*
  853          * Find the first pci bus and call it 0.  Panic if pci0 is not
  854          * bus zero and there are multiple PCI busses.
  855          */
  856         for (i = 0; i <= mptable_maxbusid; i++)
  857                 if (busses[i].bus_type == PCI) {
  858                         if (pci0 == -1)
  859                                 pci0 = i;
  860                         else if (pci0 != 0)
  861                                 panic(
  862                 "MPTable contains multiple PCI busses but no PCI bus 0");
  863                 }
  864 }
  865 
  866 static void
  867 mptable_pci_probe_table_handler(u_char *entry, void *arg)
  868 {
  869         struct pci_probe_table_args *args;
  870         int_entry_ptr intr;
  871 
  872         if (*entry != MPCT_ENTRY_INT)
  873                 return;
  874         intr = (int_entry_ptr)entry;
  875         args = (struct pci_probe_table_args *)arg;
  876         KASSERT(args->bus <= mptable_maxbusid,
  877             ("bus %d is too big", args->bus));
  878         KASSERT(busses[args->bus].bus_type == PCI, ("probing for non-PCI bus"));
  879         if (intr->src_bus_id == args->bus)
  880                 args->found = 1;
  881 }
  882 
  883 int
  884 mptable_pci_probe_table(int bus)
  885 {
  886         struct pci_probe_table_args args;
  887 
  888         if (bus < 0)
  889                 return (EINVAL);
  890         if (pci0 == -1 || pci0 + bus > mptable_maxbusid)
  891                 return (ENXIO);
  892         if (busses[pci0 + bus].bus_type != PCI)
  893                 return (ENXIO);
  894         args.bus = pci0 + bus;
  895         args.found = 0;
  896         mptable_walk_table(mptable_pci_probe_table_handler, &args);
  897         if (args.found == 0)
  898                 return (ENXIO);
  899         return (0);
  900 }
  901 
  902 static void
  903 mptable_pci_route_interrupt_handler(u_char *entry, void *arg)
  904 {
  905         struct pci_route_interrupt_args *args;
  906         int_entry_ptr intr;
  907         int vector;
  908 
  909         if (*entry != MPCT_ENTRY_INT)
  910                 return;
  911         intr = (int_entry_ptr)entry;
  912         args = (struct pci_route_interrupt_args *)arg;
  913         if (intr->src_bus_id != args->bus || intr->src_bus_irq != args->irq)
  914                 return;
  915 
  916         /* Make sure the APIC maps to a known APIC. */
  917         KASSERT(ioapics[intr->dst_apic_id] != NULL,
  918             ("No I/O APIC %d to route interrupt to", intr->dst_apic_id));
  919 
  920         /*
  921          * Look up the vector for this APIC / pin combination.  If we
  922          * have previously matched an entry for this PCI IRQ but it
  923          * has the same vector as this entry, just return.  Otherwise,
  924          * we use the vector for this APIC / pin combination.
  925          */
  926         vector = ioapic_get_vector(ioapics[intr->dst_apic_id],
  927             intr->dst_apic_int);
  928         if (args->vector == vector)
  929                 return;
  930         KASSERT(args->vector == -1,
  931             ("Multiple entries for PCI IRQ %d", args->vector));
  932         args->vector = vector;
  933 }
  934 
  935 int
  936 mptable_pci_route_interrupt(device_t pcib, device_t dev, int pin)
  937 {
  938         struct pci_route_interrupt_args args;
  939         int slot;
  940 
  941         /* Like ACPI, pin numbers are 0-3, not 1-4. */
  942         pin--;
  943         KASSERT(pci0 != -1, ("do not know how to route PCI interrupts"));
  944         args.bus = pci_get_bus(dev) + pci0;
  945         slot = pci_get_slot(dev);
  946 
  947         /*
  948          * PCI interrupt entries in the MP Table encode both the slot and
  949          * pin into the IRQ with the pin being the two least significant
  950          * bits, the slot being the next five bits, and the most significant
  951          * bit being reserved.
  952          */
  953         args.irq = slot << 2 | pin;
  954         args.vector = -1;
  955         mptable_walk_table(mptable_pci_route_interrupt_handler, &args);
  956         if (args.vector < 0) {
  957                 device_printf(pcib, "unable to route slot %d INT%c\n", slot,
  958                     'A' + pin);
  959                 return (PCI_INVALID_IRQ);
  960         }
  961         if (bootverbose)
  962                 device_printf(pcib, "slot %d INT%c routed to irq %d\n", slot,
  963                     'A' + pin, args.vector);
  964         return (args.vector);
  965 }

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