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/libsa/bootstrap.cpp

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * The contents of this file constitute Original Code as defined in and
    7  * are subject to the Apple Public Source License Version 1.1 (the
    8  * "License").  You may not use this file except in compliance with the
    9  * License.  Please obtain a copy of the License at
   10  * http://www.apple.com/publicsource and read it before using this file.
   11  * 
   12  * This Original Code and all software distributed under the License are
   13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
   17  * License for the specific language governing rights and limitations
   18  * under the License.
   19  * 
   20  * @APPLE_LICENSE_HEADER_END@
   21  */
   22 #include <IOKit/IOLib.h>
   23 #include <mach/kmod.h>
   24 #include <libkern/c++/OSDictionary.h>
   25 
   26 #include <libsa/kext.h>
   27 #include <libsa/catalogue.h>
   28 #include <libsa/malloc.h>
   29 
   30 #include "kld_patch.h"
   31 
   32 /*****
   33  * This function is used by IOCatalogue to load a kernel
   34  * extension. libsa initially sets it to be a function
   35  * that uses libkld to load and link the extension from
   36  * within the kernel. Once the root filesystem is up,
   37  * this gets switch to the kmod_load_extension() function,
   38  * which merely queues the extension for loading by the
   39  * kmodload utility.
   40  */
   41 extern kern_return_t (*kmod_load_function)(char *extension_name);
   42 extern bool (*record_startup_extensions_function)(void);
   43 extern bool (*add_from_mkext_function)(OSData * mkext);
   44 extern void (*remove_startup_extension_function)(const char * name);
   45 
   46 /****
   47  * IOCatalogue uses this variable to make a few decisions
   48  * about loading and matching drivers.
   49  */
   50 extern int kernelLinkerPresent;
   51 
   52 
   53 class KLDBootstrap {
   54 public:
   55     KLDBootstrap();
   56     ~KLDBootstrap();
   57 };
   58 
   59 
   60 static KLDBootstrap bootstrap_obj;
   61 
   62 
   63 /* The constructor creates a lock and puts entries into a dispatch
   64  * table for functions used to record and load kmods.
   65  */
   66 KLDBootstrap::KLDBootstrap() {
   67 
   68     malloc_init();
   69 
   70     kmod_load_function = &load_kernel_extension;
   71 
   72     record_startup_extensions_function = &recordStartupExtensions;
   73     add_from_mkext_function = &addExtensionsFromArchive;
   74     remove_startup_extension_function = &removeStartupExtension;
   75 
   76     kernelLinkerPresent = 1;
   77 }
   78 
   79 /* The destructor frees all wired memory regions held
   80  * by libsa's malloc package and disposes of the lock.
   81  */
   82 KLDBootstrap::~KLDBootstrap() {
   83 
   84     kld_file_cleanup_all_resources();
   85 
   86    /* Dump all device-tree entries for boot drivers, and all
   87     * info on startup extensions. The IOCatalogue will now
   88     * get personalities from kextd.
   89     */
   90     clearStartupExtensionsAndLoaderInfo();
   91 
   92    /* Free all temporary malloc memory.
   93     */
   94     malloc_reset();
   95 }

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