FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/legacy.c

     /*-
      * Copyright 1998 Massachusetts Institute of Technology
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation for any purpose and without fee is hereby
      * granted, provided that both the above copyright notice and this
      * permission notice appear in all copies, that both the above
      * copyright notice and this permission notice appear in all
      * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     * 
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
     * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.0/sys/amd64/amd64/legacy.c 222929 2011-06-10 12:30:16Z jhb $");
    
    /*
     * This code implements a system driver for legacy systems that do not
     * support ACPI or when ACPI support is not present in the kernel.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/cpu.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <machine/bus.h>
    #include <sys/pcpu.h>
    #include <sys/rman.h>
    #include <sys/smp.h>
    
    #include <machine/clock.h>
    #include <machine/legacyvar.h>
    #include <machine/resource.h>
    
    static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
    struct legacy_device {
            int                     lg_pcibus;
    };
    
    #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
    
    static  int legacy_probe(device_t);
    static  int legacy_attach(device_t);
    static  int legacy_print_child(device_t, device_t);
    static device_t legacy_add_child(device_t bus, u_int order, const char *name,
                                    int unit);
    static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
    static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
    
    static device_method_t legacy_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         legacy_probe),
            DEVMETHOD(device_attach,        legacy_attach),
            DEVMETHOD(device_detach,        bus_generic_detach),
            DEVMETHOD(device_shutdown,      bus_generic_shutdown),
            DEVMETHOD(device_suspend,       bus_generic_suspend),
            DEVMETHOD(device_resume,        bus_generic_resume),
    
            /* Bus interface */
            DEVMETHOD(bus_print_child,      legacy_print_child),
            DEVMETHOD(bus_add_child,        legacy_add_child),
            DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
            DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
            DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
            DEVMETHOD(bus_adjust_resource,  bus_generic_adjust_resource),
            DEVMETHOD(bus_release_resource, bus_generic_release_resource),
            DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
            DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
            DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
            DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
    
            { 0, 0 }
    };
    
    static driver_t legacy_driver = {
            "legacy",
            legacy_methods,
            1,                      /* no softc */
    };
    static devclass_t legacy_devclass;
   
   DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
   
   static int
   legacy_probe(device_t dev)
   {
   
           device_set_desc(dev, "legacy system");
           device_quiet(dev);
           return (0);
   }
   
   static int
   legacy_attach(device_t dev)
   {
           device_t child;
   
           /*
            * Let our child drivers identify any child devices that they
            * can find.  Once that is done attach any devices that we
            * found.
            */
           bus_generic_probe(dev);
           bus_generic_attach(dev);
   
           /*
            * If we didn't see ISA on a pci bridge, create some
            * connection points now so it shows up "on motherboard".
            */
           if (!devclass_get_device(devclass_find("isa"), 0)) {
                   child = BUS_ADD_CHILD(dev, 0, "isa", 0);
                   if (child == NULL)
                           panic("legacy_attach isa");
                   device_probe_and_attach(child);
           }
   
           return 0;
   }
   
   static int
   legacy_print_child(device_t bus, device_t child)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           int retval = 0;
   
           retval += bus_print_child_header(bus, child);
           if (atdev->lg_pcibus != -1)
                   retval += printf(" pcibus %d", atdev->lg_pcibus);
           retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
   
           return (retval);
   }
   
   static device_t
   legacy_add_child(device_t bus, u_int order, const char *name, int unit)
   {
           device_t child;
           struct legacy_device *atdev;
   
           atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
               M_NOWAIT | M_ZERO);
           if (atdev == NULL)
                   return(NULL);
           atdev->lg_pcibus = -1;
   
           child = device_add_child_ordered(bus, order, name, unit);
           if (child == NULL)
                   free(atdev, M_LEGACYDEV);
           else
                   /* should we free this in legacy_child_detached? */
                   device_set_ivars(child, atdev);
   
           return (child);
   }
   
   static int
   legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
           struct legacy_device *atdev = DEVTOAT(child);
   
           switch (which) {
           case LEGACY_IVAR_PCIDOMAIN:
                   *result = 0;
                   break;
           case LEGACY_IVAR_PCIBUS:
                   *result = atdev->lg_pcibus;
                   break;
           default:
                   return ENOENT;
           }
           return 0;
   }
           
   
   static int
   legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
   {
           struct legacy_device *atdev = DEVTOAT(child);
   
           switch (which) {
           case LEGACY_IVAR_PCIDOMAIN:
                   return EINVAL;
           case LEGACY_IVAR_PCIBUS:
                   atdev->lg_pcibus = value;
                   break;
           default:
                   return ENOENT;
           }
           return 0;
   }
   
   /*
    * Legacy CPU attachment when ACPI is not available.  Drivers like
    * cpufreq(4) hang off this.
    */
   static void     cpu_identify(driver_t *driver, device_t parent);
   static int      cpu_read_ivar(device_t dev, device_t child, int index,
                       uintptr_t *result);
   static device_t cpu_add_child(device_t bus, u_int order, const char *name,
                       int unit);
   static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
   
   struct cpu_device {
           struct resource_list cd_rl;
           struct pcpu *cd_pcpu;
   };
   
   static device_method_t cpu_methods[] = {
           /* Device interface */
           DEVMETHOD(device_identify,      cpu_identify),
           DEVMETHOD(device_probe,         bus_generic_probe),
           DEVMETHOD(device_attach,        bus_generic_attach),
           DEVMETHOD(device_detach,        bus_generic_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
   
           /* Bus interface */
           DEVMETHOD(bus_add_child,        cpu_add_child),
           DEVMETHOD(bus_read_ivar,        cpu_read_ivar),
           DEVMETHOD(bus_print_child,      bus_generic_print_child),
           DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
           DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
           DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
           DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
           DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
           DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
           DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
           DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
           DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   
           { 0, 0 }
   };
   
   static driver_t cpu_driver = {
           "cpu",
           cpu_methods,
           1,              /* no softc */
   };
   static devclass_t cpu_devclass;
   DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
   
   static void
   cpu_identify(driver_t *driver, device_t parent)
   {
           device_t child;
           int i;
   
           /*
            * Attach a cpuX device for each CPU.  We use an order of 150
            * so that these devices are attached after the Host-PCI
            * bridges (which are added at order 100).
            */
           CPU_FOREACH(i) {
                   child = BUS_ADD_CHILD(parent, 150, "cpu", i);
                   if (child == NULL)
                           panic("legacy_attach cpu");
           }
   }
   
   static device_t
   cpu_add_child(device_t bus, u_int order, const char *name, int unit)
   {
           struct cpu_device *cd;
           device_t child;
           struct pcpu *pc;
   
           if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
                   return (NULL);
   
           resource_list_init(&cd->cd_rl);
           pc = pcpu_find(device_get_unit(bus));
           cd->cd_pcpu = pc;
   
           child = device_add_child_ordered(bus, order, name, unit);
           if (child != NULL) {
                   pc->pc_device = child;
                   device_set_ivars(child, cd);
           } else
                   free(cd, M_DEVBUF);
           return (child);
   }
   
   static struct resource_list *
   cpu_get_rlist(device_t dev, device_t child)
   {
           struct cpu_device *cpdev;
   
           cpdev = device_get_ivars(child);
           return (&cpdev->cd_rl);
   }
   
   static int
   cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
   {
           struct cpu_device *cpdev;
   
           switch (index) {
           case CPU_IVAR_PCPU:
                   cpdev = device_get_ivars(child);
                   *result = (uintptr_t)cpdev->cd_pcpu;
                   break;
           case CPU_IVAR_NOMINAL_MHZ:
                   if (tsc_is_invariant) {
                           *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
                               1000000);
                           break;
                   }
                   /* FALLTHROUGH */
           default:
                   return (ENOENT);
           }
           return (0);
   }

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