FreeBSD/Linux Kernel Cross Reference
sys/libsa/bootstrap.cpp

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    #include <IOKit/IOLib.h>
    #include <mach/kmod.h>
    #include <libkern/c++/OSDictionary.h>
    
    #include <libsa/kext.h>
    #include <libsa/catalogue.h>
    #include <libsa/malloc.h>
    
    #include "kld_patch.h"
    
    /*****
     * This function is used by IOCatalogue to load a kernel
     * extension. libsa initially sets it to be a function
     * that uses libkld to load and link the extension from
     * within the kernel. Once the root filesystem is up,
     * this gets switch to the kmod_load_extension() function,
     * which merely queues the extension for loading by the
     * kmodload utility.
     */
    extern kern_return_t (*kmod_load_function)(char *extension_name);
    extern bool (*record_startup_extensions_function)(void);
    extern bool (*add_from_mkext_function)(OSData * mkext);
    extern void (*remove_startup_extension_function)(const char * name);
    
    /****
     * IOCatalogue uses this variable to make a few decisions
     * about loading and matching drivers.
     */
    extern int kernelLinkerPresent;
    
    
    class KLDBootstrap {
    public:
        KLDBootstrap();
        ~KLDBootstrap();
    };
    
    
    static KLDBootstrap bootstrap_obj;
    
    
    /* The constructor creates a lock and puts entries into a dispatch
     * table for functions used to record and load kmods.
     */
    KLDBootstrap::KLDBootstrap() {
    
        malloc_init();
    
        kmod_load_function = &load_kernel_extension;
    
        record_startup_extensions_function = &recordStartupExtensions;
        add_from_mkext_function = &addExtensionsFromArchive;
        remove_startup_extension_function = &removeStartupExtension;
    
        kernelLinkerPresent = 1;
    }
    
    /* The destructor frees all wired memory regions held
     * by libsa's malloc package and disposes of the lock.
     */
    KLDBootstrap::~KLDBootstrap() {
    
        kld_file_cleanup_all_resources();
    
       /* Dump all device-tree entries for boot drivers, and all
        * info on startup extensions. The IOCatalogue will now
        * get personalities from kextd.
        */
        clearStartupExtensionsAndLoaderInfo();
    
       /* Free all temporary malloc memory.
        */
        malloc_reset();
    }

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