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  * $FreeBSD: releng/5.1/sys/amd64/amd64/nexus.c 115251 2003-05-23 05:04:54Z peter $
   30  */
   31 
   32 /*
   33  * This code implements a `root nexus' for Intel Architecture
   34  * machines.  The function of the root nexus is to serve as an
   35  * attachment point for both processors and buses, and to manage
   36  * resources which are common to all of them.  In particular,
   37  * this code implements the core resource managers for interrupt
   38  * requests, DMA requests (which rightfully should be a part of the
   39  * ISA code but it's easier to do it here for now), I/O port addresses,
   40  * and I/O memory address space.
   41  */
   42 
   43 #include "opt_isa.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/bus.h>
   48 #include <sys/kernel.h>
   49 #include <sys/malloc.h>
   50 #include <sys/module.h>
   51 #include <machine/bus.h>
   52 #include <sys/rman.h>
   53 #include <sys/interrupt.h>
   54 
   55 #include <machine/vmparam.h>
   56 #include <vm/vm.h>
   57 #include <vm/pmap.h>
   58 #include <machine/pmap.h>
   59 
   60 #include <machine/resource.h>
   61 
   62 #ifdef DEV_ISA
   63 #include <isa/isavar.h>
   64 #include <amd64/isa/isa.h>
   65 #endif
   66 #include <amd64/isa/icu.h>
   67 #include <amd64/isa/intr_machdep.h>
   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 
  139         device_quiet(dev);      /* suppress attach message for neatness */
  140 
  141         /* 
  142          * XXX working notes:
  143          *
  144          * - IRQ resource creation should be moved to the PIC/APIC driver.
  145          * - DRQ resource creation should be moved to the DMAC driver.
  146          * - The above should be sorted to probe earlier than any child busses.
  147          *
  148          * - Leave I/O and memory creation here, as child probes may need them.
  149          *   (especially eg. ACPI)
  150          */
  151 
  152         /*
  153          * IRQ's are on the mainboard on old systems, but on the ISA part
  154          * of PCI->ISA bridges.  There would be multiple sets of IRQs on
  155          * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
  156          * component, so in a way, PCI can be a partial child of an ISA bus(!).
  157          * APIC interrupts are global though.
  158          *
  159          * XXX We depend on the AT PIC driver correctly claiming IRQ 2
  160          *     to prevent its reuse elsewhere.
  161          */
  162         irq_rman.rm_start = 0;
  163         irq_rman.rm_type = RMAN_ARRAY;
  164         irq_rman.rm_descr = "Interrupt request lines";
  165         irq_rman.rm_end = 15;
  166         if (rman_init(&irq_rman)
  167             || rman_manage_region(&irq_rman,
  168                                   irq_rman.rm_start, irq_rman.rm_end))
  169                 panic("nexus_probe irq_rman");
  170 
  171         /*
  172          * ISA DMA on PCI systems is implemented in the ISA part of each
  173          * PCI->ISA bridge and the channels can be duplicated if there are
  174          * multiple bridges.  (eg: laptops with docking stations)
  175          */
  176         drq_rman.rm_start = 0;
  177         drq_rman.rm_end = 7;
  178         drq_rman.rm_type = RMAN_ARRAY;
  179         drq_rman.rm_descr = "DMA request lines";
  180         /* XXX drq 0 not available on some machines */
  181         if (rman_init(&drq_rman)
  182             || rman_manage_region(&drq_rman,
  183                                   drq_rman.rm_start, drq_rman.rm_end))
  184                 panic("nexus_probe drq_rman");
  185 
  186         /*
  187          * However, IO ports and Memory truely are global at this level,
  188          * as are APIC interrupts (however many IO APICS there turn out
  189          * to be on large systems..)
  190          */
  191         port_rman.rm_start = 0;
  192         port_rman.rm_end = 0xffff;
  193         port_rman.rm_type = RMAN_ARRAY;
  194         port_rman.rm_descr = "I/O ports";
  195         if (rman_init(&port_rman)
  196             || rman_manage_region(&port_rman, 0, 0xffff))
  197                 panic("nexus_probe port_rman");
  198 
  199         mem_rman.rm_start = 0;
  200         mem_rman.rm_end = ~0u;
  201         mem_rman.rm_type = RMAN_ARRAY;
  202         mem_rman.rm_descr = "I/O memory addresses";
  203         if (rman_init(&mem_rman)
  204             || rman_manage_region(&mem_rman, 0, ~0))
  205                 panic("nexus_probe mem_rman");
  206 
  207         return 0;
  208 }
  209 
  210 static int
  211 nexus_attach(device_t dev)
  212 {
  213 
  214         bus_generic_probe(dev);
  215         bus_generic_attach(dev);
  216         return 0;
  217 }
  218 
  219 static int
  220 nexus_print_all_resources(device_t dev)
  221 {
  222         struct  nexus_device *ndev = DEVTONX(dev);
  223         struct resource_list *rl = &ndev->nx_resources;
  224         int retval = 0;
  225 
  226         if (SLIST_FIRST(rl))
  227                 retval += printf(" at");
  228         
  229         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  230         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  231         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  232 
  233         return retval;
  234 }
  235 
  236 static int
  237 nexus_print_child(device_t bus, device_t child)
  238 {
  239         int retval = 0;
  240 
  241         retval += bus_print_child_header(bus, child);
  242         retval += nexus_print_all_resources(child);
  243         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  244 
  245         return (retval);
  246 }
  247 
  248 static device_t
  249 nexus_add_child(device_t bus, int order, const char *name, int unit)
  250 {
  251         device_t                child;
  252         struct nexus_device     *ndev;
  253 
  254         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  255         if (!ndev)
  256                 return(0);
  257         resource_list_init(&ndev->nx_resources);
  258 
  259         child = device_add_child_ordered(bus, order, name, unit); 
  260 
  261         /* should we free this in nexus_child_detached? */
  262         device_set_ivars(child, ndev);
  263 
  264         return(child);
  265 }
  266 
  267 /*
  268  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  269  * child of one of our descendants, not a direct child of nexus0.
  270  * (Exceptions include npx.)
  271  */
  272 static struct resource *
  273 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  274                      u_long start, u_long end, u_long count, u_int flags)
  275 {
  276         struct nexus_device *ndev = DEVTONX(child);
  277         struct  resource *rv;
  278         struct resource_list_entry *rle;
  279         struct  rman *rm;
  280         int needactivate = flags & RF_ACTIVE;
  281 
  282         /*
  283          * If this is an allocation of the "default" range for a given RID, and
  284          * we know what the resources for this device are (ie. they aren't maintained
  285          * by a child bus), then work out the start/end values.
  286          */
  287         if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
  288                 if (ndev == NULL)
  289                         return(NULL);
  290                 rle = resource_list_find(&ndev->nx_resources, type, *rid);
  291                 if (rle == NULL)
  292                         return(NULL);
  293                 start = rle->start;
  294                 end = rle->end;
  295                 count = rle->count;
  296         }
  297 
  298         flags &= ~RF_ACTIVE;
  299 
  300         switch (type) {
  301         case SYS_RES_IRQ:
  302                 rm = &irq_rman;
  303                 break;
  304 
  305         case SYS_RES_DRQ:
  306                 rm = &drq_rman;
  307                 break;
  308 
  309         case SYS_RES_IOPORT:
  310                 rm = &port_rman;
  311                 break;
  312 
  313         case SYS_RES_MEMORY:
  314                 rm = &mem_rman;
  315                 break;
  316 
  317         default:
  318                 return 0;
  319         }
  320 
  321         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  322         if (rv == 0)
  323                 return 0;
  324 
  325         if (type == SYS_RES_MEMORY) {
  326                 rman_set_bustag(rv, AMD64_BUS_SPACE_MEM);
  327         } else if (type == SYS_RES_IOPORT) {
  328                 rman_set_bustag(rv, AMD64_BUS_SPACE_IO);
  329                 rman_set_bushandle(rv, rv->r_start);
  330         }
  331 
  332         if (needactivate) {
  333                 if (bus_activate_resource(child, type, *rid, rv)) {
  334                         rman_release_resource(rv);
  335                         return 0;
  336                 }
  337         }
  338         
  339         return rv;
  340 }
  341 
  342 static int
  343 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  344                         struct resource *r)
  345 {
  346         /*
  347          * If this is a memory resource, map it into the kernel.
  348          */
  349         if (rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) {
  350                 caddr_t vaddr = 0;
  351 
  352                 if (rman_get_end(r) < 1024 * 1024) {
  353                         /*
  354                          * The first 1Mb is mapped at KERNBASE.
  355                          */
  356                         vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r));
  357                 } else {
  358                         u_int64_t paddr;
  359                         u_int64_t psize;
  360                         u_int32_t poffs;
  361 
  362                         paddr = rman_get_start(r);
  363                         psize = rman_get_size(r);
  364 
  365                         poffs = paddr - trunc_page(paddr);
  366                         vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  367                 }
  368                 rman_set_virtual(r, vaddr);
  369                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  370         }
  371         return (rman_activate_resource(r));
  372 }
  373 
  374 static int
  375 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
  376                           struct resource *r)
  377 {
  378         /*
  379          * If this is a memory resource, unmap it.
  380          */
  381         if ((rman_get_bustag(r) == AMD64_BUS_SPACE_MEM) &&
  382             (rman_get_end(r) >= 1024 * 1024)) {
  383                 u_int32_t psize;
  384 
  385                 psize = rman_get_size(r);
  386                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  387         }
  388                 
  389         return (rman_deactivate_resource(r));
  390 }
  391 
  392 static int
  393 nexus_release_resource(device_t bus, device_t child, int type, int rid,
  394                        struct resource *r)
  395 {
  396         if (rman_get_flags(r) & RF_ACTIVE) {
  397                 int error = bus_deactivate_resource(child, type, rid, r);
  398                 if (error)
  399                         return error;
  400         }
  401         return (rman_release_resource(r));
  402 }
  403 
  404 /*
  405  * Currently this uses the really grody interface from kern/kern_intr.c
  406  * (which really doesn't belong in kern/anything.c).  Eventually, all of
  407  * the code in kern_intr.c and machdep_intr.c should get moved here, since
  408  * this is going to be the official interface.
  409  */
  410 static int
  411 nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
  412                  int flags, void (*ihand)(void *), void *arg, void **cookiep)
  413 {
  414         driver_t        *driver;
  415         int             error;
  416 
  417         /* somebody tried to setup an irq that failed to allocate! */
  418         if (irq == NULL)
  419                 panic("nexus_setup_intr: NULL irq resource!");
  420 
  421         *cookiep = 0;
  422         if ((irq->r_flags & RF_SHAREABLE) == 0)
  423                 flags |= INTR_EXCL;
  424 
  425         driver = device_get_driver(child);
  426 
  427         /*
  428          * We depend here on rman_activate_resource() being idempotent.
  429          */
  430         error = rman_activate_resource(irq);
  431         if (error)
  432                 return (error);
  433 
  434         error = inthand_add(device_get_nameunit(child), irq->r_start,
  435             ihand, arg, flags, cookiep);
  436 
  437         return (error);
  438 }
  439 
  440 static int
  441 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  442 {
  443         return (inthand_remove(ih));
  444 }
  445 
  446 static int
  447 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
  448 {
  449         struct nexus_device     *ndev = DEVTONX(child);
  450         struct resource_list    *rl = &ndev->nx_resources;
  451 
  452         /* XXX this should return a success/failure indicator */
  453         resource_list_add(rl, type, rid, start, start + count - 1, count);
  454         return(0);
  455 }
  456 
  457 static int
  458 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
  459 {
  460         struct nexus_device     *ndev = DEVTONX(child);
  461         struct resource_list    *rl = &ndev->nx_resources;
  462         struct resource_list_entry *rle;
  463 
  464         rle = resource_list_find(rl, type, rid);
  465         device_printf(child, "type %d  rid %d  startp %p  countp %p - got %p\n",
  466                       type, rid, startp, countp, rle);
  467         if (!rle)
  468                 return(ENOENT);
  469         if (startp)
  470                 *startp = rle->start;
  471         if (countp)
  472                 *countp = rle->count;
  473         return(0);
  474 }
  475 
  476 static void
  477 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
  478 {
  479         struct nexus_device     *ndev = DEVTONX(child);
  480         struct resource_list    *rl = &ndev->nx_resources;
  481 
  482         resource_list_delete(rl, type, rid);
  483 }
  484 
  485 #ifdef DEV_ISA
  486 /*
  487  * Placeholder which claims PnP 'devices' which describe system 
  488  * resources.
  489  */
  490 static struct isa_pnp_id sysresource_ids[] = {
  491         { 0x010cd041 /* PNP0c01 */, "System Memory" },
  492         { 0x020cd041 /* PNP0c02 */, "System Resource" },
  493         { 0 }
  494 };
  495 
  496 static int
  497 sysresource_probe(device_t dev)
  498 {
  499         int     result;
  500         
  501         if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
  502                 device_quiet(dev);
  503         }
  504         return(result);
  505 }
  506 
  507 static int
  508 sysresource_attach(device_t dev)
  509 {
  510         return(0);
  511 }
  512 
  513 static device_method_t sysresource_methods[] = {
  514         /* Device interface */
  515         DEVMETHOD(device_probe,         sysresource_probe),
  516         DEVMETHOD(device_attach,        sysresource_attach),
  517         DEVMETHOD(device_detach,        bus_generic_detach),
  518         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  519         DEVMETHOD(device_suspend,       bus_generic_suspend),
  520         DEVMETHOD(device_resume,        bus_generic_resume),
  521         { 0, 0 }
  522 };
  523 
  524 static driver_t sysresource_driver = {
  525         "sysresource",
  526         sysresource_methods,
  527         1,              /* no softc */
  528 };
  529 
  530 static devclass_t sysresource_devclass;
  531 
  532 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
  533 #endif /* DEV_ISA */

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