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/6.2/sys/amd64/amd64/legacy.c 141944 2005-02-15 07:26:28Z njl $");
   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 void legacy_identify(driver_t *driver, device_t parent);
   61 static  int legacy_probe(device_t);
   62 static  int legacy_attach(device_t);
   63 static  int legacy_print_child(device_t, device_t);
   64 static device_t legacy_add_child(device_t bus, int order, const char *name,
   65                                 int unit);
   66 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   67 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   68 
   69 static device_method_t legacy_methods[] = {
   70         /* Device interface */
   71         DEVMETHOD(device_identify,      legacy_identify),
   72         DEVMETHOD(device_probe,         legacy_probe),
   73         DEVMETHOD(device_attach,        legacy_attach),
   74         DEVMETHOD(device_detach,        bus_generic_detach),
   75         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   76         DEVMETHOD(device_suspend,       bus_generic_suspend),
   77         DEVMETHOD(device_resume,        bus_generic_resume),
   78 
   79         /* Bus interface */
   80         DEVMETHOD(bus_print_child,      legacy_print_child),
   81         DEVMETHOD(bus_add_child,        legacy_add_child),
   82         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   83         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   84         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
   85         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   86         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   87         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   88         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   89         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   90 
   91         { 0, 0 }
   92 };
   93 
   94 static driver_t legacy_driver = {
   95         "legacy",
   96         legacy_methods,
   97         1,                      /* no softc */
   98 };
   99 static devclass_t legacy_devclass;
  100 
  101 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  102 
  103 static void
  104 legacy_identify(driver_t *driver, device_t parent)
  105 {
  106 
  107         /*
  108          * Add child device with order of 1 so it gets probed
  109          * after ACPI (which is at order 0.
  110          */
  111         if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL)
  112                 panic("legacy: could not attach");
  113 }
  114 
  115 static int
  116 legacy_probe(device_t dev)
  117 {
  118         device_t acpi;
  119 
  120         /*
  121          * Fail to probe if ACPI is ok.
  122          */
  123         acpi = devclass_get_device(devclass_find("acpi"), 0);
  124         if (acpi != NULL && device_is_alive(acpi))
  125                 return (ENXIO);
  126         device_set_desc(dev, "legacy system");
  127         device_quiet(dev);
  128         return (0);
  129 }
  130 
  131 static int
  132 legacy_attach(device_t dev)
  133 {
  134         device_t child;
  135         int i;
  136 
  137         /* First, attach the CPU pseudo-driver. */
  138         for (i = 0; i <= mp_maxid; i++)
  139                 if (!CPU_ABSENT(i)) {
  140                         child = BUS_ADD_CHILD(dev, 0, "cpu", i);
  141                         if (child == NULL)
  142                                 panic("legacy_attach cpu");
  143                         device_probe_and_attach(child);
  144                 }
  145 
  146         /*
  147          * Second, let our child driver's identify any child devices that
  148          * they can find.  Once that is done attach any devices that we
  149          * found.
  150          */
  151         bus_generic_probe(dev);
  152         bus_generic_attach(dev);
  153 
  154         /*
  155          * If we didn't see ISA on a pci bridge, create some
  156          * connection points now so it shows up "on motherboard".
  157          */
  158         if (!devclass_get_device(devclass_find("isa"), 0)) {
  159                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  160                 if (child == NULL)
  161                         panic("legacy_attach isa");
  162                 device_probe_and_attach(child);
  163         }
  164 
  165         return 0;
  166 }
  167 
  168 static int
  169 legacy_print_child(device_t bus, device_t child)
  170 {
  171         struct legacy_device *atdev = DEVTOAT(child);
  172         int retval = 0;
  173 
  174         retval += bus_print_child_header(bus, child);
  175         if (atdev->lg_pcibus != -1)
  176                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  177         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  178 
  179         return (retval);
  180 }
  181 
  182 static device_t
  183 legacy_add_child(device_t bus, int order, const char *name, int unit)
  184 {
  185         device_t child;
  186         struct legacy_device *atdev;
  187 
  188         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  189             M_NOWAIT | M_ZERO);
  190         if (atdev == NULL)
  191                 return(NULL);
  192         atdev->lg_pcibus = -1;
  193 
  194         child = device_add_child_ordered(bus, order, name, unit);
  195         if (child == NULL)
  196                 free(atdev, M_LEGACYDEV);
  197         else
  198                 /* should we free this in legacy_child_detached? */
  199                 device_set_ivars(child, atdev);
  200 
  201         return (child);
  202 }
  203 
  204 static int
  205 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  206 {
  207         struct legacy_device *atdev = DEVTOAT(child);
  208 
  209         switch (which) {
  210         case LEGACY_IVAR_PCIBUS:
  211                 *result = atdev->lg_pcibus;
  212                 break;
  213         default:
  214                 return ENOENT;
  215         }
  216         return 0;
  217 }
  218         
  219 
  220 static int
  221 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  222 {
  223         struct legacy_device *atdev = DEVTOAT(child);
  224 
  225         switch (which) {
  226         case LEGACY_IVAR_PCIBUS:
  227                 atdev->lg_pcibus = value;
  228                 break;
  229         default:
  230                 return ENOENT;
  231         }
  232         return 0;
  233 }
  234 
  235 /*
  236  * Legacy CPU attachment when ACPI is not available.  Drivers like
  237  * cpufreq(4) hang off this.
  238  */
  239 static int      cpu_read_ivar(device_t dev, device_t child, int index,
  240                     uintptr_t *result);
  241 static device_t cpu_add_child(device_t bus, int order, const char *name,
  242                     int unit);
  243 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
  244 
  245 struct cpu_device {
  246         struct resource_list cd_rl;
  247         struct pcpu *cd_pcpu;
  248 };
  249 
  250 static device_method_t cpu_methods[] = {
  251         /* Device interface */
  252         DEVMETHOD(device_probe,         bus_generic_probe),
  253         DEVMETHOD(device_attach,        bus_generic_attach),
  254         DEVMETHOD(device_detach,        bus_generic_detach),
  255         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  256         DEVMETHOD(device_suspend,       bus_generic_suspend),
  257         DEVMETHOD(device_resume,        bus_generic_resume),
  258 
  259         /* Bus interface */
  260         DEVMETHOD(bus_add_child,        cpu_add_child),
  261         DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
  262         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  263         DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
  264         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  265         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  266         DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
  267         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  268         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  269         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  270         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  271         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  272         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  273 
  274         { 0, 0 }
  275 };
  276 
  277 static driver_t cpu_driver = {
  278         "cpu",
  279         cpu_methods,
  280         1,              /* no softc */
  281 };
  282 static devclass_t cpu_devclass;
  283 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
  284 
  285 static device_t
  286 cpu_add_child(device_t bus, int order, const char *name, int unit)
  287 {
  288         struct cpu_device *cd;
  289         device_t child;
  290         struct pcpu *pc;
  291 
  292         if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
  293                 return (NULL);
  294 
  295         resource_list_init(&cd->cd_rl);
  296         pc = pcpu_find(device_get_unit(bus));
  297         cd->cd_pcpu = pc;
  298 
  299         child = device_add_child_ordered(bus, order, name, unit);
  300         if (child != NULL) {
  301                 pc->pc_device = child;
  302                 device_set_ivars(child, cd);
  303         } else
  304                 free(cd, M_DEVBUF);
  305         return (child);
  306 }
  307 
  308 static struct resource_list *
  309 cpu_get_rlist(device_t dev, device_t child)
  310 {
  311         struct cpu_device *cpdev;
  312 
  313         cpdev = device_get_ivars(child);
  314         return (&cpdev->cd_rl);
  315 }
  316 
  317 static int
  318 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  319 {
  320         struct cpu_device *cpdev;
  321 
  322         if (index != CPU_IVAR_PCPU)
  323                 return (ENOENT);
  324         cpdev = device_get_ivars(child);
  325         *result = (uintptr_t)cpdev->cd_pcpu;
  326         return (0);
  327 }

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