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/i386/i386/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/9.1/sys/i386/i386/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 "opt_mca.h"
   51 #ifdef DEV_MCA
   52 #include <i386/bios/mca_machdep.h>
   53 #endif
   54 
   55 #include <machine/clock.h>
   56 #include <machine/legacyvar.h>
   57 #include <machine/resource.h>
   58 
   59 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
   60 struct legacy_device {
   61         int     lg_pcibus;
   62         int     lg_pcislot;
   63         int     lg_pcifunc;
   64 };
   65 
   66 #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
   67 
   68 static  int legacy_probe(device_t);
   69 static  int legacy_attach(device_t);
   70 static  int legacy_print_child(device_t, device_t);
   71 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
   72                                 int unit);
   73 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   74 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   75 
   76 static device_method_t legacy_methods[] = {
   77         /* Device interface */
   78         DEVMETHOD(device_probe,         legacy_probe),
   79         DEVMETHOD(device_attach,        legacy_attach),
   80         DEVMETHOD(device_detach,        bus_generic_detach),
   81         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   82         DEVMETHOD(device_suspend,       bus_generic_suspend),
   83         DEVMETHOD(device_resume,        bus_generic_resume),
   84 
   85         /* Bus interface */
   86         DEVMETHOD(bus_print_child,      legacy_print_child),
   87         DEVMETHOD(bus_add_child,        legacy_add_child),
   88         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   89         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   90         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
   91         DEVMETHOD(bus_adjust_resource,  bus_generic_adjust_resource),
   92         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   93         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   94         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   95         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   96         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   97 
   98         { 0, 0 }
   99 };
  100 
  101 static driver_t legacy_driver = {
  102         "legacy",
  103         legacy_methods,
  104         1,                      /* no softc */
  105 };
  106 static devclass_t legacy_devclass;
  107 
  108 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  109 
  110 static int
  111 legacy_probe(device_t dev)
  112 {
  113 
  114         device_set_desc(dev, "legacy system");
  115         device_quiet(dev);
  116         return (0);
  117 }
  118 
  119 static int
  120 legacy_attach(device_t dev)
  121 {
  122         device_t child;
  123 
  124         /*
  125          * Let our child drivers identify any child devices that they
  126          * can find.  Once that is done attach any devices that we
  127          * found.
  128          */
  129         bus_generic_probe(dev);
  130         bus_generic_attach(dev);
  131 
  132 #ifndef PC98
  133         /*
  134          * If we didn't see EISA or ISA on a pci bridge, create some
  135          * connection points now so they show up "on motherboard".
  136          */
  137         if (!devclass_get_device(devclass_find("eisa"), 0)) {
  138                 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
  139                 if (child == NULL)
  140                         panic("legacy_attach eisa");
  141                 device_probe_and_attach(child);
  142         }
  143 #endif
  144 #ifdef DEV_MCA
  145         if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
  146                 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
  147                 if (child == 0)
  148                         panic("legacy_probe mca");
  149                 device_probe_and_attach(child);
  150         }
  151 #endif
  152         if (!devclass_get_device(devclass_find("isa"), 0)) {
  153                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  154                 if (child == NULL)
  155                         panic("legacy_attach isa");
  156                 device_probe_and_attach(child);
  157         }
  158 
  159         return 0;
  160 }
  161 
  162 static int
  163 legacy_print_child(device_t bus, device_t child)
  164 {
  165         struct legacy_device *atdev = DEVTOAT(child);
  166         int retval = 0;
  167 
  168         retval += bus_print_child_header(bus, child);
  169         if (atdev->lg_pcibus != -1)
  170                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  171         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  172 
  173         return (retval);
  174 }
  175 
  176 static device_t
  177 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
  178 {
  179         device_t child;
  180         struct legacy_device *atdev;
  181 
  182         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  183             M_NOWAIT | M_ZERO);
  184         if (atdev == NULL)
  185                 return(NULL);
  186         atdev->lg_pcibus = -1;
  187         atdev->lg_pcislot = -1;
  188         atdev->lg_pcifunc = -1;
  189 
  190         child = device_add_child_ordered(bus, order, name, unit);
  191         if (child == NULL)
  192                 free(atdev, M_LEGACYDEV);
  193         else
  194                 /* should we free this in legacy_child_detached? */
  195                 device_set_ivars(child, atdev);
  196 
  197         return (child);
  198 }
  199 
  200 static int
  201 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  202 {
  203         struct legacy_device *atdev = DEVTOAT(child);
  204 
  205         switch (which) {
  206         case LEGACY_IVAR_PCIDOMAIN:
  207                 *result = 0;
  208                 break;
  209         case LEGACY_IVAR_PCIBUS:
  210                 *result = atdev->lg_pcibus;
  211                 break;
  212         case LEGACY_IVAR_PCISLOT:
  213                 *result = atdev->lg_pcislot;
  214                 break;
  215         case LEGACY_IVAR_PCIFUNC:
  216                 *result = atdev->lg_pcifunc;
  217                 break;
  218         default:
  219                 return ENOENT;
  220         }
  221         return 0;
  222 }
  223         
  224 
  225 static int
  226 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  227 {
  228         struct legacy_device *atdev = DEVTOAT(child);
  229 
  230         switch (which) {
  231         case LEGACY_IVAR_PCIDOMAIN:
  232                 return EINVAL;
  233         case LEGACY_IVAR_PCIBUS:
  234                 atdev->lg_pcibus = value;
  235                 break;
  236         case LEGACY_IVAR_PCISLOT:
  237                 atdev->lg_pcislot = value;
  238                 break;
  239         case LEGACY_IVAR_PCIFUNC:
  240                 atdev->lg_pcifunc = value;
  241                 break;
  242         default:
  243                 return ENOENT;
  244         }
  245         return 0;
  246 }
  247 
  248 /*
  249  * Legacy CPU attachment when ACPI is not available.  Drivers like
  250  * cpufreq(4) hang off this.
  251  */
  252 static void     cpu_identify(driver_t *driver, device_t parent);
  253 static int      cpu_read_ivar(device_t dev, device_t child, int index,
  254                     uintptr_t *result);
  255 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
  256                     int unit);
  257 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
  258 
  259 struct cpu_device {
  260         struct resource_list cd_rl;
  261         struct pcpu *cd_pcpu;
  262 };
  263 
  264 static device_method_t cpu_methods[] = {
  265         /* Device interface */
  266         DEVMETHOD(device_identify,      cpu_identify),
  267         DEVMETHOD(device_probe,         bus_generic_probe),
  268         DEVMETHOD(device_attach,        bus_generic_attach),
  269         DEVMETHOD(device_detach,        bus_generic_detach),
  270         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  271         DEVMETHOD(device_suspend,       bus_generic_suspend),
  272         DEVMETHOD(device_resume,        bus_generic_resume),
  273 
  274         /* Bus interface */
  275         DEVMETHOD(bus_add_child,        cpu_add_child),
  276         DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
  277         DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
  278         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  279         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  280         DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
  281         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  282         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  283         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  284         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  285         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  286 
  287         DEVMETHOD_END
  288 };
  289 
  290 static driver_t cpu_driver = {
  291         "cpu",
  292         cpu_methods,
  293         1,              /* no softc */
  294 };
  295 static devclass_t cpu_devclass;
  296 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
  297 
  298 static void
  299 cpu_identify(driver_t *driver, device_t parent)
  300 {
  301         device_t child;
  302         int i;
  303 
  304         /*
  305          * Attach a cpuX device for each CPU.  We use an order of 150
  306          * so that these devices are attached after the Host-PCI
  307          * bridges (which are added at order 100).
  308          */
  309         CPU_FOREACH(i) {
  310                 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
  311                 if (child == NULL)
  312                         panic("legacy_attach cpu");
  313         }
  314 }
  315 
  316 static device_t
  317 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
  318 {
  319         struct cpu_device *cd;
  320         device_t child;
  321         struct pcpu *pc;
  322 
  323         if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
  324                 return (NULL);
  325 
  326         resource_list_init(&cd->cd_rl);
  327         pc = pcpu_find(device_get_unit(bus));
  328         cd->cd_pcpu = pc;
  329 
  330         child = device_add_child_ordered(bus, order, name, unit);
  331         if (child != NULL) {
  332                 pc->pc_device = child;
  333                 device_set_ivars(child, cd);
  334         } else
  335                 free(cd, M_DEVBUF);
  336         return (child);
  337 }
  338 
  339 static struct resource_list *
  340 cpu_get_rlist(device_t dev, device_t child)
  341 {
  342         struct cpu_device *cpdev;
  343 
  344         cpdev = device_get_ivars(child);
  345         return (&cpdev->cd_rl);
  346 }
  347 
  348 static int
  349 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  350 {
  351         struct cpu_device *cpdev;
  352 
  353         switch (index) {
  354         case CPU_IVAR_PCPU:
  355                 cpdev = device_get_ivars(child);
  356                 *result = (uintptr_t)cpdev->cd_pcpu;
  357                 break;
  358         case CPU_IVAR_NOMINAL_MHZ:
  359                 if (tsc_is_invariant) {
  360                         *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
  361                             1000000);
  362                         break;
  363                 }
  364                 /* FALLTHROUGH */
  365         default:
  366                 return (ENOENT);
  367         }
  368         return (0);
  369 }

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