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/5.2/sys/amd64/amd64/nexus.c 123180 2003-12-06 23:19:47Z peter $");
   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 #include "opt_isa.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bus.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/module.h>
   52 #include <machine/bus.h>
   53 #include <machine/intr_machdep.h>
   54 #include <sys/rman.h>
   55 #include <sys/interrupt.h>
   56 
   57 #include <machine/vmparam.h>
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <machine/pmap.h>
   61 
   62 #include <machine/resource.h>
   63 
   64 #ifdef DEV_ISA
   65 #include <isa/isavar.h>
   66 #include <amd64/isa/isa.h>
   67 #endif
   68 #include <sys/rtprio.h>
   69 
   70 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   71 struct nexus_device {
   72         struct resource_list    nx_resources;
   73 };
   74 
   75 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   76 
   77 static struct rman irq_rman, drq_rman, port_rman, mem_rman;
   78 
   79 static  int nexus_probe(device_t);
   80 static  int nexus_attach(device_t);
   81 static  int nexus_print_all_resources(device_t dev);
   82 static  int nexus_print_child(device_t, device_t);
   83 static device_t nexus_add_child(device_t bus, int order, const char *name,
   84                                 int unit);
   85 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   86                                               u_long, u_long, u_long, u_int);
   87 static  int nexus_activate_resource(device_t, device_t, int, int,
   88                                     struct resource *);
   89 static  int nexus_deactivate_resource(device_t, device_t, int, int,
   90                                       struct resource *);
   91 static  int nexus_release_resource(device_t, device_t, int, int,
   92                                    struct resource *);
   93 static  int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
   94                              void (*)(void *), void *, void **);
   95 static  int nexus_teardown_intr(device_t, device_t, struct resource *,
   96                                 void *);
   97 static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
   98 static  int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
   99 static void nexus_delete_resource(device_t, device_t, int, int);
  100 
  101 static device_method_t nexus_methods[] = {
  102         /* Device interface */
  103         DEVMETHOD(device_probe,         nexus_probe),
  104         DEVMETHOD(device_attach,        nexus_attach),
  105         DEVMETHOD(device_detach,        bus_generic_detach),
  106         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  107         DEVMETHOD(device_suspend,       bus_generic_suspend),
  108         DEVMETHOD(device_resume,        bus_generic_resume),
  109 
  110         /* Bus interface */
  111         DEVMETHOD(bus_print_child,      nexus_print_child),
  112         DEVMETHOD(bus_add_child,        nexus_add_child),
  113         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
  114         DEVMETHOD(bus_release_resource, nexus_release_resource),
  115         DEVMETHOD(bus_activate_resource, nexus_activate_resource),
  116         DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
  117         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
  118         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  119         DEVMETHOD(bus_set_resource,     nexus_set_resource),
  120         DEVMETHOD(bus_get_resource,     nexus_get_resource),
  121         DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
  122 
  123         { 0, 0 }
  124 };
  125 
  126 static driver_t nexus_driver = {
  127         "nexus",
  128         nexus_methods,
  129         1,                      /* no softc */
  130 };
  131 static devclass_t nexus_devclass;
  132 
  133 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
  134 
  135 static int
  136 nexus_probe(device_t dev)
  137 {
  138         int irq, last;
  139 
  140         device_quiet(dev);      /* suppress attach message for neatness */
  141 
  142         /* 
  143          * XXX working notes:
  144          *
  145          * - IRQ resource creation should be moved to the PIC/APIC driver.
  146          * - DRQ resource creation should be moved to the DMAC driver.
  147          * - The above should be sorted to probe earlier than any child busses.
  148          *
  149          * - Leave I/O and memory creation here, as child probes may need them.
  150          *   (especially eg. ACPI)
  151          */
  152 
  153         /*
  154          * IRQ's are on the mainboard on old systems, but on the ISA part
  155          * of PCI->ISA bridges.  There would be multiple sets of IRQs on
  156          * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
  157          * component, so in a way, PCI can be a partial child of an ISA bus(!).
  158          * APIC interrupts are global though.
  159          */
  160         irq_rman.rm_start = 0;
  161         irq_rman.rm_type = RMAN_ARRAY;
  162         irq_rman.rm_descr = "Interrupt request lines";
  163         irq_rman.rm_end = NUM_IO_INTS - 1;
  164         if (rman_init(&irq_rman))
  165                 panic("nexus_probe irq_rman");
  166 
  167         /*
  168          * We search for regions of existing IRQs and add those to the IRQ
  169          * resource manager.
  170          */
  171         last = -1;
  172         for (irq = 0; irq < NUM_IO_INTS; irq++)
  173                 if (intr_lookup_source(irq) != NULL) {
  174                         if (last == -1)
  175                                 last = irq;
  176                 } else if (last != -1) {
  177                         if (rman_manage_region(&irq_rman, last, irq - 1) != 0)
  178                                 panic("nexus_probe irq_rman add");
  179                         last = -1;
  180                 }
  181         if (last != -1 && rman_manage_region(&irq_rman, last, irq - 1) != 0)
  182                 panic("nexus_probe irq_rman add");
  183 
  184         /*
  185          * ISA DMA on PCI systems is implemented in the ISA part of each
  186          * PCI->ISA bridge and the channels can be duplicated if there are
  187          * multiple bridges.  (eg: laptops with docking stations)
  188          */
  189         drq_rman.rm_start = 0;
  190         drq_rman.rm_end = 7;
  191         drq_rman.rm_type = RMAN_ARRAY;
  192         drq_rman.rm_descr = "DMA request lines";
  193         /* XXX drq 0 not available on some machines */
  194         if (rman_init(&drq_rman)
  195             || rman_manage_region(&drq_rman,
  196                                   drq_rman.rm_start, drq_rman.rm_end))
  197                 panic("nexus_probe drq_rman");
  198 
  199         /*
  200          * However, IO ports and Memory truely are global at this level,
  201          * as are APIC interrupts (however many IO APICS there turn out
  202          * to be on large systems..)
  203          */
  204         port_rman.rm_start = 0;
  205         port_rman.rm_end = 0xffff;
  206         port_rman.rm_type = RMAN_ARRAY;
  207         port_rman.rm_descr = "I/O ports";
  208         if (rman_init(&port_rman)
  209             || rman_manage_region(&port_rman, 0, 0xffff))
  210                 panic("nexus_probe port_rman");
  211 
  212         mem_rman.rm_start = 0;
  213         mem_rman.rm_end = ~0u;
  214         mem_rman.rm_type = RMAN_ARRAY;
  215         mem_rman.rm_descr = "I/O memory addresses";
  216         if (rman_init(&mem_rman)
  217             || rman_manage_region(&mem_rman, 0, ~0))
  218                 panic("nexus_probe mem_rman");
  219 
  220         return 0;
  221 }
  222 
  223 static int
  224 nexus_attach(device_t dev)
  225 {
  226 
  227         bus_generic_probe(dev);
  228         bus_generic_attach(dev);
  229         return 0;
  230 }
  231 
  232 static int
  233 nexus_print_all_resources(device_t dev)
  234 {
  235         struct  nexus_device *ndev = DEVTONX(dev);
  236         struct resource_list *rl = &ndev->nx_resources;
  237         int retval = 0;
  238 
  239         if (SLIST_FIRST(rl))
  240                 retval += printf(" at");
  241         
  242         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  243         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  244         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  245 
  246         return retval;
  247 }
  248 
  249 static int
  250 nexus_print_child(device_t bus, device_t child)
  251 {
  252         int retval = 0;
  253 
  254         retval += bus_print_child_header(bus, child);
  255         retval += nexus_print_all_resources(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, rv->r_start);
  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          * If this is a memory resource, map it into the kernel.
  360          */
  361         if (rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) {
  362                 caddr_t vaddr = 0;
  363 
  364                 if (rman_get_end(r) < 1024 * 1024) {
  365                         /*
  366                          * The first 1Mb is mapped at KERNBASE.
  367                          */
  368                         vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
  369                 } else {
  370                         u_int64_t paddr;
  371                         u_int64_t psize;
  372                         u_int32_t poffs;
  373 
  374                         paddr = rman_get_start(r);
  375                         psize = rman_get_size(r);
  376 
  377                         poffs = paddr - trunc_page(paddr);
  378                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  379                 }
  380                 rman_set_virtual(r, vaddr);
  381                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  382         }
  383         return (rman_activate_resource(r));
  384 }
  385 
  386 static int
  387 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  388                           struct resource *r)
  389 {
  390         /*
  391          * If this is a memory resource, unmap it.
  392          */
  393         if ((rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) &&
  394             (rman_get_end(r) >= 1024 * 1024)) {
  395                 u_int32_t psize;
  396 
  397                 psize = rman_get_size(r);
  398                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  399         }
  400                 
  401         return (rman_deactivate_resource(r));
  402 }
  403 
  404 static int
  405 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  406                        struct resource *r)
  407 {
  408         if (rman_get_flags(r) & RF_ACTIVE) {
  409                 int error = bus_deactivate_resource(child, type, rid, r);
  410                 if (error)
  411                         return error;
  412         }
  413         return (rman_release_resource(r));
  414 }
  415 
  416 /*
  417  * Currently this uses the really grody interface from kern/kern_intr.c
  418  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  419  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  420  * this is going to be the official interface.
  421  */
  422 static int
  423 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
  424                  int flags, void (*ihand)(void *), void *arg, void **cookiep)
  425 {
  426         int             error;
  427 
  428         /* somebody tried to setup an irq that failed to allocate! */
  429         if (irq == NULL)
  430                 panic("nexus_setup_intr: NULL irq resource!");
  431 
  432         *cookiep = 0;
  433         if ((irq->r_flags & RF_SHAREABLE) == 0)
  434                 flags |= INTR_EXCL;
  435 
  436         /*
  437          * We depend here on rman_activate_resource() being idempotent.
  438          */
  439         error = rman_activate_resource(irq);
  440         if (error)
  441                 return (error);
  442 
  443         error = intr_add_handler(device_get_nameunit(child), irq->r_start,
  444             ihand, arg, flags, cookiep);
  445 
  446         return (error);
  447 }
  448 
  449 static int
  450 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  451 {
  452         return (intr_remove_handler(ih));
  453 }
  454 
  455 static int
  456 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
  457 {
  458         struct nexus_device     *ndev = DEVTONX(child);
  459         struct resource_list    *rl = &ndev->nx_resources;
  460 
  461         /* XXX this should return a success/failure indicator */
  462         resource_list_add(rl, type, rid, start, start + count - 1, count);
  463         return(0);
  464 }
  465 
  466 static int
  467 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
  468 {
  469         struct nexus_device     *ndev = DEVTONX(child);
  470         struct resource_list    *rl = &ndev->nx_resources;
  471         struct resource_list_entry *rle;
  472 
  473         rle = resource_list_find(rl, type, rid);
  474         device_printf(child, "type %d  rid %d  startp %p  countp %p - got %p\n",
  475                       type, rid, startp, countp, rle);
  476         if (!rle)
  477                 return(ENOENT);
  478         if (startp)
  479                 *startp = rle->start;
  480         if (countp)
  481                 *countp = rle->count;
  482         return(0);
  483 }
  484 
  485 static void
  486 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  487 {
  488         struct nexus_device     *ndev = DEVTONX(child);
  489         struct resource_list    *rl = &ndev->nx_resources;
  490 
  491         resource_list_delete(rl, type, rid);
  492 }
  493 
  494 #ifdef DEV_ISA
  495 /*
  496  * Placeholder which claims PnP 'devices' which describe system 
  497  * resources.
  498  */
  499 static struct isa_pnp_id sysresource_ids[] = {
  500         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  501         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  502         { 0 }
  503 };
  504 
  505 static int
  506 sysresource_probe(device_t dev)
  507 {
  508         int     result;
  509         
  510         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
  511                 device_quiet(dev);
  512         }
  513         return(result);
  514 }
  515 
  516 static int
  517 sysresource_attach(device_t dev)
  518 {
  519         return(0);
  520 }
  521 
  522 static device_method_t sysresource_methods[] = {
  523         /* Device interface */
  524         DEVMETHOD(device_probe,         sysresource_probe),
  525         DEVMETHOD(device_attach,        sysresource_attach),
  526         DEVMETHOD(device_detach,        bus_generic_detach),
  527         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  528         DEVMETHOD(device_suspend,       bus_generic_suspend),
  529         DEVMETHOD(device_resume,        bus_generic_resume),
  530         { 0, 0 }
  531 };
  532 
  533 static driver_t sysresource_driver = {
  534         "sysresource",
  535         sysresource_methods,
  536         1,              /* no softc */
  537 };
  538 
  539 static devclass_t sysresource_devclass;
  540 
  541 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
  542 #endif /* DEV_ISA */

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