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: releng/8.0/sys/amd64/amd64/legacy.c 177157 2008-03-13 20:39:04Z 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/legacyvar.h>
   51 #include <machine/resource.h>
   52 
   53 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
   54 struct legacy_device {
   55         int                     lg_pcibus;
   56 };
   57 
   58 #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
   59 
   60 static  int legacy_probe(device_t);
   61 static  int legacy_attach(device_t);
   62 static  int legacy_print_child(device_t, device_t);
   63 static device_t legacy_add_child(device_t bus, int order, const char *name,
   64                                 int unit);
   65 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   66 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   67 
   68 static device_method_t legacy_methods[] = {
   69         /* Device interface */
   70         DEVMETHOD(device_probe,         legacy_probe),
   71         DEVMETHOD(device_attach,        legacy_attach),
   72         DEVMETHOD(device_detach,        bus_generic_detach),
   73         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   74         DEVMETHOD(device_suspend,       bus_generic_suspend),
   75         DEVMETHOD(device_resume,        bus_generic_resume),
   76 
   77         /* Bus interface */
   78         DEVMETHOD(bus_print_child,      legacy_print_child),
   79         DEVMETHOD(bus_add_child,        legacy_add_child),
   80         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   81         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   82         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
   83         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   84         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   85         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   86         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   87         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   88 
   89         { 0, 0 }
   90 };
   91 
   92 static driver_t legacy_driver = {
   93         "legacy",
   94         legacy_methods,
   95         1,                      /* no softc */
   96 };
   97 static devclass_t legacy_devclass;
   98 
   99 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  100 
  101 static int
  102 legacy_probe(device_t dev)
  103 {
  104 
  105         device_set_desc(dev, "legacy system");
  106         device_quiet(dev);
  107         return (0);
  108 }
  109 
  110 static int
  111 legacy_attach(device_t dev)
  112 {
  113         device_t child;
  114 
  115         /*
  116          * Let our child drivers identify any child devices that they
  117          * can find.  Once that is done attach any devices that we
  118          * found.
  119          */
  120         bus_generic_probe(dev);
  121         bus_generic_attach(dev);
  122 
  123         /*
  124          * If we didn't see ISA on a pci bridge, create some
  125          * connection points now so it shows up "on motherboard".
  126          */
  127         if (!devclass_get_device(devclass_find("isa"), 0)) {
  128                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  129                 if (child == NULL)
  130                         panic("legacy_attach isa");
  131                 device_probe_and_attach(child);
  132         }
  133 
  134         return 0;
  135 }
  136 
  137 static int
  138 legacy_print_child(device_t bus, device_t child)
  139 {
  140         struct legacy_device *atdev = DEVTOAT(child);
  141         int retval = 0;
  142 
  143         retval += bus_print_child_header(bus, child);
  144         if (atdev->lg_pcibus != -1)
  145                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  146         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  147 
  148         return (retval);
  149 }
  150 
  151 static device_t
  152 legacy_add_child(device_t bus, int order, const char *name, int unit)
  153 {
  154         device_t child;
  155         struct legacy_device *atdev;
  156 
  157         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  158             M_NOWAIT | M_ZERO);
  159         if (atdev == NULL)
  160                 return(NULL);
  161         atdev->lg_pcibus = -1;
  162 
  163         child = device_add_child_ordered(bus, order, name, unit);
  164         if (child == NULL)
  165                 free(atdev, M_LEGACYDEV);
  166         else
  167                 /* should we free this in legacy_child_detached? */
  168                 device_set_ivars(child, atdev);
  169 
  170         return (child);
  171 }
  172 
  173 static int
  174 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  175 {
  176         struct legacy_device *atdev = DEVTOAT(child);
  177 
  178         switch (which) {
  179         case LEGACY_IVAR_PCIDOMAIN:
  180                 *result = 0;
  181                 break;
  182         case LEGACY_IVAR_PCIBUS:
  183                 *result = atdev->lg_pcibus;
  184                 break;
  185         default:
  186                 return ENOENT;
  187         }
  188         return 0;
  189 }
  190         
  191 
  192 static int
  193 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  194 {
  195         struct legacy_device *atdev = DEVTOAT(child);
  196 
  197         switch (which) {
  198         case LEGACY_IVAR_PCIDOMAIN:
  199                 return EINVAL;
  200         case LEGACY_IVAR_PCIBUS:
  201                 atdev->lg_pcibus = value;
  202                 break;
  203         default:
  204                 return ENOENT;
  205         }
  206         return 0;
  207 }
  208 
  209 /*
  210  * Legacy CPU attachment when ACPI is not available.  Drivers like
  211  * cpufreq(4) hang off this.
  212  */
  213 static void     cpu_identify(driver_t *driver, device_t parent);
  214 static int      cpu_read_ivar(device_t dev, device_t child, int index,
  215                     uintptr_t *result);
  216 static device_t cpu_add_child(device_t bus, int order, const char *name,
  217                     int unit);
  218 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
  219 
  220 struct cpu_device {
  221         struct resource_list cd_rl;
  222         struct pcpu *cd_pcpu;
  223 };
  224 
  225 static device_method_t cpu_methods[] = {
  226         /* Device interface */
  227         DEVMETHOD(device_identify,      cpu_identify),
  228         DEVMETHOD(device_probe,         bus_generic_probe),
  229         DEVMETHOD(device_attach,        bus_generic_attach),
  230         DEVMETHOD(device_detach,        bus_generic_detach),
  231         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  232         DEVMETHOD(device_suspend,       bus_generic_suspend),
  233         DEVMETHOD(device_resume,        bus_generic_resume),
  234 
  235         /* Bus interface */
  236         DEVMETHOD(bus_add_child,        cpu_add_child),
  237         DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
  238         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  239         DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
  240         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  241         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  242         DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
  243         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  244         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  245         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  246         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  247         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  248         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  249 
  250         { 0, 0 }
  251 };
  252 
  253 static driver_t cpu_driver = {
  254         "cpu",
  255         cpu_methods,
  256         1,              /* no softc */
  257 };
  258 static devclass_t cpu_devclass;
  259 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
  260 
  261 static void
  262 cpu_identify(driver_t *driver, device_t parent)
  263 {
  264         device_t child;
  265         int i;
  266 
  267         /*
  268          * Attach a cpuX device for each CPU.  We use an order of 150
  269          * so that these devices are attached after the Host-PCI
  270          * bridges (which are added at order 100).
  271          */
  272         for (i = 0; i <= mp_maxid; i++)
  273                 if (!CPU_ABSENT(i)) {
  274                         child = BUS_ADD_CHILD(parent, 150, "cpu", i);
  275                         if (child == NULL)
  276                                 panic("legacy_attach cpu");
  277                 }
  278 }
  279 
  280 static device_t
  281 cpu_add_child(device_t bus, int order, const char *name, int unit)
  282 {
  283         struct cpu_device *cd;
  284         device_t child;
  285         struct pcpu *pc;
  286 
  287         if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
  288                 return (NULL);
  289 
  290         resource_list_init(&cd->cd_rl);
  291         pc = pcpu_find(device_get_unit(bus));
  292         cd->cd_pcpu = pc;
  293 
  294         child = device_add_child_ordered(bus, order, name, unit);
  295         if (child != NULL) {
  296                 pc->pc_device = child;
  297                 device_set_ivars(child, cd);
  298         } else
  299                 free(cd, M_DEVBUF);
  300         return (child);
  301 }
  302 
  303 static struct resource_list *
  304 cpu_get_rlist(device_t dev, device_t child)
  305 {
  306         struct cpu_device *cpdev;
  307 
  308         cpdev = device_get_ivars(child);
  309         return (&cpdev->cd_rl);
  310 }
  311 
  312 static int
  313 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  314 {
  315         struct cpu_device *cpdev;
  316 
  317         if (index != CPU_IVAR_PCPU)
  318                 return (ENOENT);
  319         cpdev = device_get_ivars(child);
  320         *result = (uintptr_t)cpdev->cd_pcpu;
  321         return (0);
  322 }

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