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 #ifdef __i386__
   31 #include "opt_eisa.h"
   32 #include "opt_mca.h"
   33 #endif
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/10.2/sys/x86/x86/legacy.c 233707 2012-03-30 19:10:14Z jhb $");
   36 
   37 /*
   38  * This code implements a system driver for legacy systems that do not
   39  * support ACPI or when ACPI support is not present in the kernel.
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/bus.h>
   45 #include <sys/cpu.h>
   46 #include <sys/kernel.h>
   47 #include <sys/malloc.h>
   48 #include <sys/module.h>
   49 #include <machine/bus.h>
   50 #include <sys/pcpu.h>
   51 #include <sys/rman.h>
   52 #include <sys/smp.h>
   53 
   54 #ifdef DEV_MCA
   55 #include <i386/bios/mca_machdep.h>
   56 #endif
   57 
   58 #include <machine/clock.h>
   59 #include <machine/resource.h>
   60 #include <x86/legacyvar.h>
   61 
   62 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
   63 struct legacy_device {
   64         int     lg_pcibus;
   65         int     lg_pcislot;
   66         int     lg_pcifunc;
   67 };
   68 
   69 #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
   70 
   71 static  int legacy_probe(device_t);
   72 static  int legacy_attach(device_t);
   73 static  int legacy_print_child(device_t, device_t);
   74 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
   75                                 int unit);
   76 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   77 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   78 
   79 static device_method_t legacy_methods[] = {
   80         /* Device interface */
   81         DEVMETHOD(device_probe,         legacy_probe),
   82         DEVMETHOD(device_attach,        legacy_attach),
   83         DEVMETHOD(device_detach,        bus_generic_detach),
   84         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   85         DEVMETHOD(device_suspend,       bus_generic_suspend),
   86         DEVMETHOD(device_resume,        bus_generic_resume),
   87 
   88         /* Bus interface */
   89         DEVMETHOD(bus_print_child,      legacy_print_child),
   90         DEVMETHOD(bus_add_child,        legacy_add_child),
   91         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   92         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   93         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
   94         DEVMETHOD(bus_adjust_resource,  bus_generic_adjust_resource),
   95         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   96         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   97         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   98         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   99         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  100 
  101         { 0, 0 }
  102 };
  103 
  104 static driver_t legacy_driver = {
  105         "legacy",
  106         legacy_methods,
  107         1,                      /* no softc */
  108 };
  109 static devclass_t legacy_devclass;
  110 
  111 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  112 
  113 static int
  114 legacy_probe(device_t dev)
  115 {
  116 
  117         device_set_desc(dev, "legacy system");
  118         device_quiet(dev);
  119         return (0);
  120 }
  121 
  122 static int
  123 legacy_attach(device_t dev)
  124 {
  125         device_t child;
  126 
  127         /*
  128          * Let our child drivers identify any child devices that they
  129          * can find.  Once that is done attach any devices that we
  130          * found.
  131          */
  132         bus_generic_probe(dev);
  133         bus_generic_attach(dev);
  134 
  135         /*
  136          * If we didn't see EISA or ISA on a pci bridge, create some
  137          * connection points now so they show up "on motherboard".
  138          */
  139 #ifdef DEV_EISA
  140         if (!devclass_get_device(devclass_find("eisa"), 0)) {
  141                 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
  142                 if (child == NULL)
  143                         panic("legacy_attach eisa");
  144                 device_probe_and_attach(child);
  145         }
  146 #endif
  147 #ifdef DEV_MCA
  148         if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
  149                 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
  150                 if (child == 0)
  151                         panic("legacy_probe mca");
  152                 device_probe_and_attach(child);
  153         }
  154 #endif
  155         if (!devclass_get_device(devclass_find("isa"), 0)) {
  156                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  157                 if (child == NULL)
  158                         panic("legacy_attach isa");
  159                 device_probe_and_attach(child);
  160         }
  161 
  162         return 0;
  163 }
  164 
  165 static int
  166 legacy_print_child(device_t bus, device_t child)
  167 {
  168         struct legacy_device *atdev = DEVTOAT(child);
  169         int retval = 0;
  170 
  171         retval += bus_print_child_header(bus, child);
  172         if (atdev->lg_pcibus != -1)
  173                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  174         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  175 
  176         return (retval);
  177 }
  178 
  179 static device_t
  180 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
  181 {
  182         device_t child;
  183         struct legacy_device *atdev;
  184 
  185         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  186             M_NOWAIT | M_ZERO);
  187         if (atdev == NULL)
  188                 return(NULL);
  189         atdev->lg_pcibus = -1;
  190         atdev->lg_pcislot = -1;
  191         atdev->lg_pcifunc = -1;
  192 
  193         child = device_add_child_ordered(bus, order, name, unit);
  194         if (child == NULL)
  195                 free(atdev, M_LEGACYDEV);
  196         else
  197                 /* should we free this in legacy_child_detached? */
  198                 device_set_ivars(child, atdev);
  199 
  200         return (child);
  201 }
  202 
  203 static int
  204 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  205 {
  206         struct legacy_device *atdev = DEVTOAT(child);
  207 
  208         switch (which) {
  209         case LEGACY_IVAR_PCIDOMAIN:
  210                 *result = 0;
  211                 break;
  212         case LEGACY_IVAR_PCIBUS:
  213                 *result = atdev->lg_pcibus;
  214                 break;
  215         case LEGACY_IVAR_PCISLOT:
  216                 *result = atdev->lg_pcislot;
  217                 break;
  218         case LEGACY_IVAR_PCIFUNC:
  219                 *result = atdev->lg_pcifunc;
  220                 break;
  221         default:
  222                 return ENOENT;
  223         }
  224         return 0;
  225 }
  226         
  227 
  228 static int
  229 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  230 {
  231         struct legacy_device *atdev = DEVTOAT(child);
  232 
  233         switch (which) {
  234         case LEGACY_IVAR_PCIDOMAIN:
  235                 return EINVAL;
  236         case LEGACY_IVAR_PCIBUS:
  237                 atdev->lg_pcibus = value;
  238                 break;
  239         case LEGACY_IVAR_PCISLOT:
  240                 atdev->lg_pcislot = value;
  241                 break;
  242         case LEGACY_IVAR_PCIFUNC:
  243                 atdev->lg_pcifunc = value;
  244                 break;
  245         default:
  246                 return ENOENT;
  247         }
  248         return 0;
  249 }
  250 
  251 /*
  252  * Legacy CPU attachment when ACPI is not available.  Drivers like
  253  * cpufreq(4) hang off this.
  254  */
  255 static void     cpu_identify(driver_t *driver, device_t parent);
  256 static int      cpu_read_ivar(device_t dev, device_t child, int index,
  257                     uintptr_t *result);
  258 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
  259                     int unit);
  260 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
  261 
  262 struct cpu_device {
  263         struct resource_list cd_rl;
  264         struct pcpu *cd_pcpu;
  265 };
  266 
  267 static device_method_t cpu_methods[] = {
  268         /* Device interface */
  269         DEVMETHOD(device_identify,      cpu_identify),
  270         DEVMETHOD(device_probe,         bus_generic_probe),
  271         DEVMETHOD(device_attach,        bus_generic_attach),
  272         DEVMETHOD(device_detach,        bus_generic_detach),
  273         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  274         DEVMETHOD(device_suspend,       bus_generic_suspend),
  275         DEVMETHOD(device_resume,        bus_generic_resume),
  276 
  277         /* Bus interface */
  278         DEVMETHOD(bus_add_child,        cpu_add_child),
  279         DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
  280         DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
  281         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  282         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  283         DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
  284         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  285         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  286         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  287         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  288         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  289 
  290         DEVMETHOD_END
  291 };
  292 
  293 static driver_t cpu_driver = {
  294         "cpu",
  295         cpu_methods,
  296         1,              /* no softc */
  297 };
  298 static devclass_t cpu_devclass;
  299 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
  300 
  301 static void
  302 cpu_identify(driver_t *driver, device_t parent)
  303 {
  304         device_t child;
  305         int i;
  306 
  307         /*
  308          * Attach a cpuX device for each CPU.  We use an order of 150
  309          * so that these devices are attached after the Host-PCI
  310          * bridges (which are added at order 100).
  311          */
  312         CPU_FOREACH(i) {
  313                 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
  314                 if (child == NULL)
  315                         panic("legacy_attach cpu");
  316         }
  317 }
  318 
  319 static device_t
  320 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
  321 {
  322         struct cpu_device *cd;
  323         device_t child;
  324         struct pcpu *pc;
  325 
  326         if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
  327                 return (NULL);
  328 
  329         resource_list_init(&cd->cd_rl);
  330         pc = pcpu_find(device_get_unit(bus));
  331         cd->cd_pcpu = pc;
  332 
  333         child = device_add_child_ordered(bus, order, name, unit);
  334         if (child != NULL) {
  335                 pc->pc_device = child;
  336                 device_set_ivars(child, cd);
  337         } else
  338                 free(cd, M_DEVBUF);
  339         return (child);
  340 }
  341 
  342 static struct resource_list *
  343 cpu_get_rlist(device_t dev, device_t child)
  344 {
  345         struct cpu_device *cpdev;
  346 
  347         cpdev = device_get_ivars(child);
  348         return (&cpdev->cd_rl);
  349 }
  350 
  351 static int
  352 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  353 {
  354         struct cpu_device *cpdev;
  355 
  356         switch (index) {
  357         case CPU_IVAR_PCPU:
  358                 cpdev = device_get_ivars(child);
  359                 *result = (uintptr_t)cpdev->cd_pcpu;
  360                 break;
  361         case CPU_IVAR_NOMINAL_MHZ:
  362                 if (tsc_is_invariant) {
  363                         *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
  364                             1000000);
  365                         break;
  366                 }
  367                 /* FALLTHROUGH */
  368         default:
  369                 return (ENOENT);
  370         }
  371         return (0);
  372 }
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FreeBSD/Linux Kernel Cross Reference sys/x86/x86/legacy.c

FreeBSD/Linux Kernel Cross Reference
sys/x86/x86/legacy.c
