libsa/bootstrap.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 #include <IOKit/IOLib.h>
  31 #include <mach/kmod.h>
  32 #include <libkern/c++/OSDictionary.h>
  33
  34 #include <libsa/kext.h>
  35 #include <libsa/catalogue.h>
  36 #include <libsa/malloc.h>
  37
  38 #include "kld_patch.h"
  39
  40 /*****
  41  * This function is used by IOCatalogue to load a kernel
  42  * extension. libsa initially sets it to be a function
  43  * that uses libkld to load and link the extension from
  44  * within the kernel. Once the root filesystem is up,
  45  * this gets switch to the kmod_load_extension() function,
  46  * which merely queues the extension for loading by the
  47  * kmodload utility.
  48  */
  49 extern kern_return_t (*kmod_load_function)(char *extension_name);
  50 extern bool (*record_startup_extensions_function)(void);
  51 extern bool (*add_from_mkext_function)(OSData * mkext);
  52 extern void (*remove_startup_extension_function)(const char * name);
  53
  54 /****
  55  * IOCatalogue uses this variable to make a few decisions
  56  * about loading and matching drivers.
  57  */
  58 extern int kernelLinkerPresent;
  59
  60
  61 class KLDBootstrap {
  62 public:
  63     KLDBootstrap();
  64     ~KLDBootstrap();
  65 };
  66
  67
  68 static KLDBootstrap bootstrap_obj;
  69
  70
  71 /* The constructor creates a lock and puts entries into a dispatch
  72  * table for functions used to record and load kmods.
  73  */
  74 KLDBootstrap::KLDBootstrap() {
  75
  76     malloc_init();
  77
  78     kmod_load_function = &load_kernel_extension;
  79
  80     record_startup_extensions_function = &recordStartupExtensions;
  81     add_from_mkext_function = &addExtensionsFromArchive;
  82     remove_startup_extension_function = &removeStartupExtension;
  83
  84     kernelLinkerPresent = 1;
  85 }
  86
  87 /* The destructor frees all wired memory regions held
  88  * by libsa's malloc package and disposes of the lock.
  89  */
  90 KLDBootstrap::~KLDBootstrap() {
  91
  92     kld_file_cleanup_all_resources();
  93
  94    /* Dump all device-tree entries for boot drivers, and all
  95     * info on startup extensions. The IOCatalogue will now
  96     * get personalities from kextd.
  97     */
  98     clearStartupExtensionsAndLoaderInfo();
  99
 100    /* Free all temporary malloc memory.
 101     */
 102     malloc_reset();
 103 }