libsa/bootstrap.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <IOKit/IOLib.h>
  29 #include <mach/kmod.h>
  30 #include <libkern/c++/OSDictionary.h>
  31
  32 #include <libsa/kext.h>
  33 #include <libsa/catalogue.h>
  34 #include <libsa/malloc.h>
  35
  36 #include "kld_patch.h"
  37
  38 /*****
  39  * This function is used by IOCatalogue to load a kernel
  40  * extension. libsa initially sets it to be a function
  41  * that uses libkld to load and link the extension from
  42  * within the kernel. Once the root filesystem is up,
  43  * this gets switch to the kmod_load_extension() function,
  44  * which merely queues the extension for loading by the
  45  * kmodload utility.
  46  */
  47 extern kern_return_t (*kmod_load_function)(char *extension_name);
  48 extern bool (*record_startup_extensions_function)(void);
  49 extern bool (*add_from_mkext_function)(OSData * mkext);
  50 extern void (*remove_startup_extension_function)(const char * name);
  51
  52 /****
  53  * IOCatalogue uses this variable to make a few decisions
  54  * about loading and matching drivers.
  55  */
  56 extern int kernelLinkerPresent;
  57
  58
  59 class KLDBootstrap {
  60 public:
  61     KLDBootstrap();
  62     ~KLDBootstrap();
  63 };
  64
  65
  66 static KLDBootstrap bootstrap_obj;
  67
  68
  69 /* The constructor creates a lock and puts entries into a dispatch
  70  * table for functions used to record and load kmods.
  71  */
  72 KLDBootstrap::KLDBootstrap() {
  73
  74     malloc_init();
  75
  76     kmod_load_function = &load_kernel_extension;
  77
  78     record_startup_extensions_function = &recordStartupExtensions;
  79     add_from_mkext_function = &addExtensionsFromArchive;
  80     remove_startup_extension_function = &removeStartupExtension;
  81
  82     kernelLinkerPresent = 1;
  83 }
  84
  85 /* The destructor frees all wired memory regions held
  86  * by libsa's malloc package and disposes of the lock.
  87  */
  88 KLDBootstrap::~KLDBootstrap() {
  89
  90     kld_file_cleanup_all_resources();
  91
  92    /* Dump all device-tree entries for boot drivers, and all
  93     * info on startup extensions. The IOCatalogue will now
  94     * get personalities from kextd.
  95     */
  96     clearStartupExtensionsAndLoaderInfo();
  97
  98    /* Free all temporary malloc memory.
  99     */
 100     malloc_reset();
 101 }