FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/platform.c

     /*-
      * Copyright (c) 2005 Peter Grehan
      * Copyright (c) 2009 Nathan Whitehorn
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 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/8.4/sys/powerpc/powerpc/platform.c 227713 2011-11-19 13:03:14Z marius $");
    
    /*
     * Dispatch platform calls to the appropriate platform implementation
     * through a previously registered kernel object.
     */
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/ktr.h>
    #include <sys/mutex.h>
    #include <sys/systm.h>
    #include <sys/sysctl.h>
    #include <sys/types.h>
    
    #include <vm/vm.h>
    #include <vm/vm_page.h>
    
    #include <machine/cpu.h>
    #include <machine/platform.h>
    #include <machine/platformvar.h>
    #include <machine/smp.h>
    
    #include "platform_if.h"
    
    static platform_def_t   *plat_def_impl;
    static platform_t       plat_obj;
    static struct kobj_ops  plat_kernel_kops;
    static struct platform_kobj     plat_kernel_obj;
    
    static char plat_name[64] = "";
    SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RD | CTLFLAG_TUN,
        plat_name, 0, "Platform currently in use");
    
    void
    mem_regions(struct mem_region **phys, int *physsz, struct mem_region **avail,
        int *availsz)
    {
            PLATFORM_MEM_REGIONS(plat_obj, phys, physsz, avail, availsz);
    }
    
    const char *
    installed_platform()
    {
            return (plat_def_impl->name);
    }
    
    u_long
    platform_timebase_freq(struct cpuref *cpu)
    {
            return (PLATFORM_TIMEBASE_FREQ(plat_obj, cpu));
    }
            
    int
    platform_smp_first_cpu(struct cpuref *cpu)
    {
            return (PLATFORM_SMP_FIRST_CPU(plat_obj, cpu));
    }
    
    int
    platform_smp_next_cpu(struct cpuref *cpu)
    {
            return (PLATFORM_SMP_NEXT_CPU(plat_obj, cpu));
    }
    
    int
    platform_smp_get_bsp(struct cpuref *cpu)
    {
            return (PLATFORM_SMP_GET_BSP(plat_obj, cpu));
   }
   
   int
   platform_smp_start_cpu(struct pcpu *cpu)
   {
           return (PLATFORM_SMP_START_CPU(plat_obj, cpu));
   }
   
   /*
    * Reset back to firmware.
    */
   void
   cpu_reset()
   {
           PLATFORM_RESET(plat_obj);
   }
   
   /*
    * Platform install routines. Highest priority wins, using the same
    * algorithm as bus attachment.
    */
   SET_DECLARE(platform_set, platform_def_t);
   
   void
   platform_probe_and_attach()
   {
           platform_def_t  **platpp, *platp;
           int             prio, best_prio;
   
           plat_obj = &plat_kernel_obj;
           best_prio = 0;
   
           /*
            * Try to locate the best platform kobj
            */
           SET_FOREACH(platpp, platform_set) {
                   platp = *platpp;
   
                   /*
                    * Take care of compiling the selected class, and
                    * then statically initialise the MMU object
                    */
                   kobj_class_compile_static(platp, &plat_kernel_kops);
                   kobj_init_static((kobj_t)plat_obj, platp);
   
                   prio = PLATFORM_PROBE(plat_obj);
   
                   /* Check for errors */
                   if (prio > 0)
                           continue;
   
                   /*
                    * Check if this module was specifically requested through
                    * the loader tunable we provide.
                    */
                   if (strcmp(platp->name,plat_name) == 0) {
                           plat_def_impl = platp;
                           break;
                   }
   
                   /* Otherwise, see if it is better than our current best */
                   if (plat_def_impl == NULL || prio > best_prio) {
                           best_prio = prio;
                           plat_def_impl = platp;
                   }
   
                   /*
                    * We can't free the KOBJ, since it is static. Luckily,
                    * this has no ill effects since it gets reset every time.
                    */
           }
   
           if (plat_def_impl == NULL)
                   panic("No platform module found!");
   
           /*
            * Recompile to make sure we ended with the
            * correct one, and then attach.
            */
   
           kobj_class_compile_static(plat_def_impl, &plat_kernel_kops);
           kobj_init_static((kobj_t)plat_obj, plat_def_impl);
   
           strlcpy(plat_name,plat_def_impl->name,sizeof(plat_name));
   
           PLATFORM_ATTACH(plat_obj);
   }
   

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