The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/legacy.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: stable/9/sys/amd64/amd64/legacy.c 234150 2012-04-11 20:50:17Z jhb $");
   32 
   33 /*
   34  * This code implements a system driver for legacy systems that do not
   35  * support ACPI or when ACPI support is not present in the kernel.
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bus.h>
   41 #include <sys/cpu.h>
   42 #include <sys/kernel.h>
   43 #include <sys/malloc.h>
   44 #include <sys/module.h>
   45 #include <machine/bus.h>
   46 #include <sys/pcpu.h>
   47 #include <sys/rman.h>
   48 #include <sys/smp.h>
   49 
   50 #include <machine/clock.h>
   51 #include <machine/legacyvar.h>
   52 #include <machine/resource.h>
   53 
   54 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
   55 struct legacy_device {
   56         int     lg_pcibus;
   57         int     lg_pcislot;
   58         int     lg_pcifunc;
   59 };
   60 
   61 #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
   62 
   63 static  int legacy_probe(device_t);
   64 static  int legacy_attach(device_t);
   65 static  int legacy_print_child(device_t, device_t);
   66 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
   67                                 int unit);
   68 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   69 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   70 
   71 static device_method_t legacy_methods[] = {
   72         /* Device interface */
   73         DEVMETHOD(device_probe,         legacy_probe),
   74         DEVMETHOD(device_attach,        legacy_attach),
   75         DEVMETHOD(device_detach,        bus_generic_detach),
   76         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   77         DEVMETHOD(device_suspend,       bus_generic_suspend),
   78         DEVMETHOD(device_resume,        bus_generic_resume),
   79 
   80         /* Bus interface */
   81         DEVMETHOD(bus_print_child,      legacy_print_child),
   82         DEVMETHOD(bus_add_child,        legacy_add_child),
   83         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   84         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   85         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
   86         DEVMETHOD(bus_adjust_resource,  bus_generic_adjust_resource),
   87         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   88         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   89         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   90         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   91         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   92 
   93         { 0, 0 }
   94 };
   95 
   96 static driver_t legacy_driver = {
   97         "legacy",
   98         legacy_methods,
   99         1,                      /* no softc */
  100 };
  101 static devclass_t legacy_devclass;
  102 
  103 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  104 
  105 static int
  106 legacy_probe(device_t dev)
  107 {
  108 
  109         device_set_desc(dev, "legacy system");
  110         device_quiet(dev);
  111         return (0);
  112 }
  113 
  114 static int
  115 legacy_attach(device_t dev)
  116 {
  117         device_t child;
  118 
  119         /*
  120          * Let our child drivers identify any child devices that they
  121          * can find.  Once that is done attach any devices that we
  122          * found.
  123          */
  124         bus_generic_probe(dev);
  125         bus_generic_attach(dev);
  126 
  127         /*
  128          * If we didn't see ISA on a pci bridge, create some
  129          * connection points now so it shows up "on motherboard".
  130          */
  131         if (!devclass_get_device(devclass_find("isa"), 0)) {
  132                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  133                 if (child == NULL)
  134                         panic("legacy_attach isa");
  135                 device_probe_and_attach(child);
  136         }
  137 
  138         return 0;
  139 }
  140 
  141 static int
  142 legacy_print_child(device_t bus, device_t child)
  143 {
  144         struct legacy_device *atdev = DEVTOAT(child);
  145         int retval = 0;
  146 
  147         retval += bus_print_child_header(bus, child);
  148         if (atdev->lg_pcibus != -1)
  149                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  150         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  151 
  152         return (retval);
  153 }
  154 
  155 static device_t
  156 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
  157 {
  158         device_t child;
  159         struct legacy_device *atdev;
  160 
  161         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  162             M_NOWAIT | M_ZERO);
  163         if (atdev == NULL)
  164                 return(NULL);
  165         atdev->lg_pcibus = -1;
  166         atdev->lg_pcislot = -1;
  167         atdev->lg_pcifunc = -1;
  168 
  169         child = device_add_child_ordered(bus, order, name, unit);
  170         if (child == NULL)
  171                 free(atdev, M_LEGACYDEV);
  172         else
  173                 /* should we free this in legacy_child_detached? */
  174                 device_set_ivars(child, atdev);
  175 
  176         return (child);
  177 }
  178 
  179 static int
  180 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  181 {
  182         struct legacy_device *atdev = DEVTOAT(child);
  183 
  184         switch (which) {
  185         case LEGACY_IVAR_PCIDOMAIN:
  186                 *result = 0;
  187                 break;
  188         case LEGACY_IVAR_PCIBUS:
  189                 *result = atdev->lg_pcibus;
  190                 break;
  191         case LEGACY_IVAR_PCISLOT:
  192                 *result = atdev->lg_pcislot;
  193                 break;
  194         case LEGACY_IVAR_PCIFUNC:
  195                 *result = atdev->lg_pcifunc;
  196                 break;
  197         default:
  198                 return ENOENT;
  199         }
  200         return 0;
  201 }
  202         
  203 
  204 static int
  205 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  206 {
  207         struct legacy_device *atdev = DEVTOAT(child);
  208 
  209         switch (which) {
  210         case LEGACY_IVAR_PCIDOMAIN:
  211                 return EINVAL;
  212         case LEGACY_IVAR_PCIBUS:
  213                 atdev->lg_pcibus = value;
  214                 break;
  215         case LEGACY_IVAR_PCISLOT:
  216                 atdev->lg_pcislot = value;
  217                 break;
  218         case LEGACY_IVAR_PCIFUNC:
  219                 atdev->lg_pcifunc = value;
  220                 break;
  221         default:
  222                 return ENOENT;
  223         }
  224         return 0;
  225 }
  226 
  227 /*
  228  * Legacy CPU attachment when ACPI is not available.  Drivers like
  229  * cpufreq(4) hang off this.
  230  */
  231 static void     cpu_identify(driver_t *driver, device_t parent);
  232 static int      cpu_read_ivar(device_t dev, device_t child, int index,
  233                     uintptr_t *result);
  234 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
  235                     int unit);
  236 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
  237 
  238 struct cpu_device {
  239         struct resource_list cd_rl;
  240         struct pcpu *cd_pcpu;
  241 };
  242 
  243 static device_method_t cpu_methods[] = {
  244         /* Device interface */
  245         DEVMETHOD(device_identify,      cpu_identify),
  246         DEVMETHOD(device_probe,         bus_generic_probe),
  247         DEVMETHOD(device_attach,        bus_generic_attach),
  248         DEVMETHOD(device_detach,        bus_generic_detach),
  249         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  250         DEVMETHOD(device_suspend,       bus_generic_suspend),
  251         DEVMETHOD(device_resume,        bus_generic_resume),
  252 
  253         /* Bus interface */
  254         DEVMETHOD(bus_add_child,        cpu_add_child),
  255         DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
  256         DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
  257         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  258         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  259         DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
  260         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  261         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  262         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  263         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  264         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  265 
  266         DEVMETHOD_END
  267 };
  268 
  269 static driver_t cpu_driver = {
  270         "cpu",
  271         cpu_methods,
  272         1,              /* no softc */
  273 };
  274 static devclass_t cpu_devclass;
  275 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
  276 
  277 static void
  278 cpu_identify(driver_t *driver, device_t parent)
  279 {
  280         device_t child;
  281         int i;
  282 
  283         /*
  284          * Attach a cpuX device for each CPU.  We use an order of 150
  285          * so that these devices are attached after the Host-PCI
  286          * bridges (which are added at order 100).
  287          */
  288         CPU_FOREACH(i) {
  289                 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
  290                 if (child == NULL)
  291                         panic("legacy_attach cpu");
  292         }
  293 }
  294 
  295 static device_t
  296 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
  297 {
  298         struct cpu_device *cd;
  299         device_t child;
  300         struct pcpu *pc;
  301 
  302         if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
  303                 return (NULL);
  304 
  305         resource_list_init(&cd->cd_rl);
  306         pc = pcpu_find(device_get_unit(bus));
  307         cd->cd_pcpu = pc;
  308 
  309         child = device_add_child_ordered(bus, order, name, unit);
  310         if (child != NULL) {
  311                 pc->pc_device = child;
  312                 device_set_ivars(child, cd);
  313         } else
  314                 free(cd, M_DEVBUF);
  315         return (child);
  316 }
  317 
  318 static struct resource_list *
  319 cpu_get_rlist(device_t dev, device_t child)
  320 {
  321         struct cpu_device *cpdev;
  322 
  323         cpdev = device_get_ivars(child);
  324         return (&cpdev->cd_rl);
  325 }
  326 
  327 static int
  328 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  329 {
  330         struct cpu_device *cpdev;
  331 
  332         switch (index) {
  333         case CPU_IVAR_PCPU:
  334                 cpdev = device_get_ivars(child);
  335                 *result = (uintptr_t)cpdev->cd_pcpu;
  336                 break;
  337         case CPU_IVAR_NOMINAL_MHZ:
  338                 if (tsc_is_invariant) {
  339                         *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
  340                             1000000);
  341                         break;
  342                 }
  343                 /* FALLTHROUGH */
  344         default:
  345                 return (ENOENT);
  346         }
  347         return (0);
  348 }

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