The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/nexus.c

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * 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/6.2/sys/amd64/amd64/nexus.c 162558 2006-09-22 19:04:51Z jhb $");
   32 
   33 /*
   34  * This code implements a `root nexus' for Intel Architecture
   35  * machines.  The function of the root nexus is to serve as an
   36  * attachment point for both processors and buses, and to manage
   37  * resources which are common to all of them.  In particular,
   38  * this code implements the core resource managers for interrupt
   39  * requests, DMA requests (which rightfully should be a part of the
   40  * ISA code but it's easier to do it here for now), I/O port addresses,
   41  * and I/O memory address space.
   42  */
   43 
   44 #define __RMAN_RESOURCE_VISIBLE
   45 #include "opt_isa.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/bus.h>
   50 #include <sys/kernel.h>
   51 #include <sys/malloc.h>
   52 #include <sys/module.h>
   53 #include <machine/bus.h>
   54 #include <machine/intr_machdep.h>
   55 #include <sys/rman.h>
   56 #include <sys/interrupt.h>
   57 
   58 #include <machine/vmparam.h>
   59 #include <vm/vm.h>
   60 #include <vm/pmap.h>
   61 #include <machine/pmap.h>
   62 
   63 #include <machine/resource.h>
   64 
   65 #ifdef DEV_ISA
   66 #include <isa/isavar.h>
   67 #include <amd64/isa/isa.h>
   68 #endif
   69 #include <sys/rtprio.h>
   70 
   71 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   72 struct nexus_device {
   73         struct resource_list    nx_resources;
   74 };
   75 
   76 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   77 
   78 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
   79 
   80 static  int nexus_probe(device_t);
   81 static  int nexus_attach(device_t);
   82 static  int nexus_print_all_resources(device_t dev);
   83 static  int nexus_print_child(device_t, device_t);
   84 static device_t nexus_add_child(device_t bus, int order, const char *name,
   85                                 int unit);
   86 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   87                                               u_long, u_long, u_long, u_int);
   88 static  int nexus_config_intr(device_t, int, enum intr_trigger,
   89                               enum intr_polarity);
   90 static  int nexus_activate_resource(device_t, device_t, int, int,
   91                                     struct resource *);
   92 static  int nexus_deactivate_resource(device_t, device_t, int, int,
   93                                       struct resource *);
   94 static  int nexus_release_resource(device_t, device_t, int, int,
   95                                    struct resource *);
   96 static  int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
   97                              void (*)(void *), void *, void **);
   98 static  int nexus_teardown_intr(device_t, device_t, struct resource *,
   99                                 void *);
  100 static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
  101 static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
  102 static  int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
  103 static void nexus_delete_resource(device_t, device_t, int, int);
  104 
  105 static device_method_t nexus_methods[] = {
  106         /* Device interface */
  107         DEVMETHOD(device_probe,         nexus_probe),
  108         DEVMETHOD(device_attach,        nexus_attach),
  109         DEVMETHOD(device_detach,        bus_generic_detach),
  110         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  111         DEVMETHOD(device_suspend,       bus_generic_suspend),
  112         DEVMETHOD(device_resume,        bus_generic_resume),
  113 
  114         /* Bus interface */
  115         DEVMETHOD(bus_print_child,      nexus_print_child),
  116         DEVMETHOD(bus_add_child,        nexus_add_child),
  117         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  118         DEVMETHOD(bus_release_resource, nexus_release_resource),
  119         DEVMETHOD(bus_activate_resource, nexus_activate_resource),
  120         DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
  121         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  122         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  123         DEVMETHOD(bus_config_intr,      nexus_config_intr),
  124         DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
  125         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  126         DEVMETHOD(bus_get_resource,     nexus_get_resource),
  127         DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
  128 
  129         { 0, 0 }
  130 };
  131 
  132 static driver_t nexus_driver = {
  133         "nexus",
  134         nexus_methods,
  135         1,                      /* no softc */
  136 };
  137 static devclass_t nexus_devclass;
  138 
  139 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
  140 
  141 static int
  142 nexus_probe(device_t dev)
  143 {
  144         int irq;
  145 
  146         device_quiet(dev);      /* suppress attach message for neatness */
  147 
  148         /* 
  149          * XXX working notes:
  150          *
  151          * - IRQ resource creation should be moved to the PIC/APIC driver.
  152          * - DRQ resource creation should be moved to the DMAC driver.
  153          * - The above should be sorted to probe earlier than any child busses.
  154          *
  155          * - Leave I/O and memory creation here, as child probes may need them.
  156          *   (especially eg. ACPI)
  157          */
  158 
  159         /*
  160          * IRQ's are on the mainboard on old systems, but on the ISA part
  161          * of PCI->ISA bridges.  There would be multiple sets of IRQs on
  162          * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
  163          * component, so in a way, PCI can be a partial child of an ISA bus(!).
  164          * APIC interrupts are global though.
  165          */
  166         irq_rman.rm_start = 0;
  167         irq_rman.rm_type = RMAN_ARRAY;
  168         irq_rman.rm_descr = "Interrupt request lines";
  169         irq_rman.rm_end = NUM_IO_INTS - 1;
  170         if (rman_init(&irq_rman))
  171                 panic("nexus_probe irq_rman");
  172 
  173         /*
  174          * We search for regions of existing IRQs and add those to the IRQ
  175          * resource manager.
  176          */
  177         for (irq = 0; irq < NUM_IO_INTS; irq++)
  178                 if (intr_lookup_source(irq) != NULL)
  179                         if (rman_manage_region(&irq_rman, irq, irq) != 0)
  180                                 panic("nexus_probe irq_rman add");
  181 
  182         /*
  183          * ISA DMA on PCI systems is implemented in the ISA part of each
  184          * PCI->ISA bridge and the channels can be duplicated if there are
  185          * multiple bridges.  (eg: laptops with docking stations)
  186          */
  187         drq_rman.rm_start = 0;
  188         drq_rman.rm_end = 7;
  189         drq_rman.rm_type = RMAN_ARRAY;
  190         drq_rman.rm_descr = "DMA request lines";
  191         /* XXX drq 0 not available on some machines */
  192         if (rman_init(&drq_rman)
  193             || rman_manage_region(&drq_rman,
  194                                   drq_rman.rm_start, drq_rman.rm_end))
  195                 panic("nexus_probe drq_rman");
  196 
  197         /*
  198          * However, IO ports and Memory truely are global at this level,
  199          * as are APIC interrupts (however many IO APICS there turn out
  200          * to be on large systems..)
  201          */
  202         port_rman.rm_start = 0;
  203         port_rman.rm_end = 0xffff;
  204         port_rman.rm_type = RMAN_ARRAY;
  205         port_rman.rm_descr = "I/O ports";
  206         if (rman_init(&port_rman)
  207             || rman_manage_region(&port_rman, 0, 0xffff))
  208                 panic("nexus_probe port_rman");
  209 
  210         mem_rman.rm_start = 0;
  211         mem_rman.rm_end = ~0u;
  212         mem_rman.rm_type = RMAN_ARRAY;
  213         mem_rman.rm_descr = "I/O memory addresses";
  214         if (rman_init(&mem_rman)
  215             || rman_manage_region(&mem_rman, 0, ~0))
  216                 panic("nexus_probe mem_rman");
  217 
  218         return 0;
  219 }
  220 
  221 static int
  222 nexus_attach(device_t dev)
  223 {
  224 
  225         bus_generic_probe(dev);
  226         bus_generic_attach(dev);
  227         return 0;
  228 }
  229 
  230 static int
  231 nexus_print_all_resources(device_t dev)
  232 {
  233         struct  nexus_device *ndev = DEVTONX(dev);
  234         struct resource_list *rl = &ndev->nx_resources;
  235         int retval = 0;
  236 
  237         if (STAILQ_FIRST(rl))
  238                 retval += printf(" at");
  239         
  240         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  241         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  242         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  243 
  244         return retval;
  245 }
  246 
  247 static int
  248 nexus_print_child(device_t bus, device_t child)
  249 {
  250         int retval = 0;
  251 
  252         retval += bus_print_child_header(bus, child);
  253         retval += nexus_print_all_resources(child);
  254         if (device_get_flags(child))
  255                 retval += printf(" flags %#x", device_get_flags(child));
  256         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  257 
  258         return (retval);
  259 }
  260 
  261 static device_t
  262 nexus_add_child(device_t bus, int order, const char *name, int unit)
  263 {
  264         device_t                child;
  265         struct nexus_device     *ndev;
  266 
  267         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  268         if (!ndev)
  269                 return(0);
  270         resource_list_init(&ndev->nx_resources);
  271 
  272         child = device_add_child_ordered(bus, order, name, unit); 
  273 
  274         /* should we free this in nexus_child_detached? */
  275         device_set_ivars(child, ndev);
  276 
  277         return(child);
  278 }
  279 
  280 /*
  281  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  282  * child of one of our descendants, not a direct child of nexus0.
  283  */
  284 static struct resource *
  285 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  286                      u_long start, u_long end, u_long count, u_int flags)
  287 {
  288         struct nexus_device *ndev = DEVTONX(child);
  289         struct  resource *rv;
  290         struct resource_list_entry *rle;
  291         struct  rman *rm;
  292         int needactivate = flags & RF_ACTIVE;
  293 
  294         /*
  295          * If this is an allocation of the "default" range for a given RID, and
  296          * we know what the resources for this device are (ie. they aren't maintained
  297          * by a child bus), then work out the start/end values.
  298          */
  299         if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
  300                 if (ndev == NULL)
  301                         return(NULL);
  302                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  303                 if (rle == NULL)
  304                         return(NULL);
  305                 start = rle->start;
  306                 end = rle->end;
  307                 count = rle->count;
  308         }
  309 
  310         flags &= ~RF_ACTIVE;
  311 
  312         switch (type) {
  313         case SYS_RES_IRQ:
  314                 rm = &irq_rman;
  315                 break;
  316 
  317         case SYS_RES_DRQ:
  318                 rm = &drq_rman;
  319                 break;
  320 
  321         case SYS_RES_IOPORT:
  322                 rm = &port_rman;
  323                 break;
  324 
  325         case SYS_RES_MEMORY:
  326                 rm = &mem_rman;
  327                 break;
  328 
  329         default:
  330                 return 0;
  331         }
  332 
  333         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  334         if (rv == 0)
  335                 return 0;
  336 
  337         if (type == SYS_RES_MEMORY) {
  338                 rman_set_bustag(rv, AMD64_BUS_SPACE_MEM);
  339         } else if (type == SYS_RES_IOPORT) {
  340                 rman_set_bustag(rv, AMD64_BUS_SPACE_IO);
  341                 rman_set_bushandle(rv, rman_get_start(rv));
  342         }
  343 
  344         if (needactivate) {
  345                 if (bus_activate_resource(child, type, *rid, rv)) {
  346                         rman_release_resource(rv);
  347                         return 0;
  348                 }
  349         }
  350         
  351         return rv;
  352 }
  353 
  354 static int
  355 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  356                         struct resource *r)
  357 {
  358 
  359         /*
  360          * If this is a memory resource, map it into the kernel.
  361          */
  362         if (rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) {
  363                 caddr_t vaddr = 0;
  364 
  365                 if (rman_get_end(r) < 1024 * 1024) {
  366                         /*
  367                          * The first 1Mb is mapped at KERNBASE.
  368                          */
  369                         vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
  370                 } else {
  371                         u_int64_t paddr;
  372                         u_int64_t psize;
  373                         u_int32_t poffs;
  374 
  375                         paddr = rman_get_start(r);
  376                         psize = rman_get_size(r);
  377 
  378                         poffs = paddr - trunc_page(paddr);
  379                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  380                 }
  381                 rman_set_virtual(r, vaddr);
  382                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  383         }
  384         return (rman_activate_resource(r));
  385 }
  386 
  387 static int
  388 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  389                           struct resource *r)
  390 {
  391         /*
  392          * If this is a memory resource, unmap it.
  393          */
  394         if ((rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) &&
  395             (rman_get_end(r) >= 1024 * 1024)) {
  396                 u_int32_t psize;
  397 
  398                 psize = rman_get_size(r);
  399                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  400         }
  401                 
  402         return (rman_deactivate_resource(r));
  403 }
  404 
  405 static int
  406 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  407                        struct resource *r)
  408 {
  409         if (rman_get_flags(r) & RF_ACTIVE) {
  410                 int error = bus_deactivate_resource(child, type, rid, r);
  411                 if (error)
  412                         return error;
  413         }
  414         return (rman_release_resource(r));
  415 }
  416 
  417 /*
  418  * Currently this uses the really grody interface from kern/kern_intr.c
  419  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  420  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  421  * this is going to be the official interface.
  422  */
  423 static int
  424 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
  425                  int flags, void (*ihand)(void *), void *arg, void **cookiep)
  426 {
  427         int             error;
  428 
  429         /* somebody tried to setup an irq that failed to allocate! */
  430         if (irq == NULL)
  431                 panic("nexus_setup_intr: NULL irq resource!");
  432 
  433         *cookiep = 0;
  434         if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
  435                 flags |= INTR_EXCL;
  436 
  437         /*
  438          * We depend here on rman_activate_resource() being idempotent.
  439          */
  440         error = rman_activate_resource(irq);
  441         if (error)
  442                 return (error);
  443 
  444         error = intr_add_handler(device_get_nameunit(child),
  445             rman_get_start(irq), ihand, arg, flags, cookiep);
  446 
  447         return (error);
  448 }
  449 
  450 static int
  451 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  452 {
  453         return (intr_remove_handler(ih));
  454 }
  455 
  456 static int
  457 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  458     enum intr_polarity pol)
  459 {
  460         return (intr_config_intr(irq, trig, pol));
  461 }
  462 
  463 static struct resource_list *
  464 nexus_get_reslist(device_t dev, device_t child)
  465 {
  466         struct nexus_device *ndev = DEVTONX(child);
  467 
  468         return (&ndev->nx_resources);
  469 }
  470 
  471 static int
  472 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
  473 {
  474         struct nexus_device     *ndev = DEVTONX(child);
  475         struct resource_list    *rl = &ndev->nx_resources;
  476 
  477         /* XXX this should return a success/failure indicator */
  478         resource_list_add(rl, type, rid, start, start + count - 1, count);
  479         return(0);
  480 }
  481 
  482 static int
  483 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
  484 {
  485         struct nexus_device     *ndev = DEVTONX(child);
  486         struct resource_list    *rl = &ndev->nx_resources;
  487         struct resource_list_entry *rle;
  488 
  489         rle = resource_list_find(rl, type, rid);
  490         if (!rle)
  491                 return(ENOENT);
  492         if (startp)
  493                 *startp = rle->start;
  494         if (countp)
  495                 *countp = rle->count;
  496         return(0);
  497 }
  498 
  499 static void
  500 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  501 {
  502         struct nexus_device     *ndev = DEVTONX(child);
  503         struct resource_list    *rl = &ndev->nx_resources;
  504 
  505         resource_list_delete(rl, type, rid);
  506 }
  507 
  508 #ifdef DEV_ISA
  509 /*
  510  * Placeholder which claims PnP 'devices' which describe system 
  511  * resources.
  512  */
  513 static struct isa_pnp_id sysresource_ids[] = {
  514         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  515         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  516         { 0 }
  517 };
  518 
  519 static int
  520 sysresource_probe(device_t dev)
  521 {
  522         int     result;
  523         
  524         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
  525                 device_quiet(dev);
  526         }
  527         return(result);
  528 }
  529 
  530 static int
  531 sysresource_attach(device_t dev)
  532 {
  533         return(0);
  534 }
  535 
  536 static device_method_t sysresource_methods[] = {
  537         /* Device interface */
  538         DEVMETHOD(device_probe,         sysresource_probe),
  539         DEVMETHOD(device_attach,        sysresource_attach),
  540         DEVMETHOD(device_detach,        bus_generic_detach),
  541         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  542         DEVMETHOD(device_suspend,       bus_generic_suspend),
  543         DEVMETHOD(device_resume,        bus_generic_resume),
  544         { 0, 0 }
  545 };
  546 
  547 static driver_t sysresource_driver = {
  548         "sysresource",
  549         sysresource_methods,
  550         1,              /* no softc */
  551 };
  552 
  553 static devclass_t sysresource_devclass;
  554 
  555 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
  556 #endif /* DEV_ISA */

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