1 /* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. 7 * 8 * This file contains Original Code and/or Modifications of Original Code 9 * as defined in and that are subject to the Apple Public Source License 10 * Version 2.0 (the 'License'). You may not use this file except in 11 * compliance with the License. Please obtain a copy of the License at 12 * http://www.opensource.apple.com/apsl/ and read it before using this 13 * file. 14 * 15 * The Original Code and all software distributed under the License are 16 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 17 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 18 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 20 * Please see the License for the specific language governing rights and 21 * limitations under the License. 22 * 23 * @APPLE_LICENSE_HEADER_END@ 24 */ 25 #include <IOKit/IOLib.h> 26 #include <mach/kmod.h> 27 #include <libkern/c++/OSDictionary.h> 28 29 #include <libsa/kext.h> 30 #include <libsa/catalogue.h> 31 #include <libsa/malloc.h> 32 33 #include "kld_patch.h" 34 35 /***** 36 * This function is used by IOCatalogue to load a kernel 37 * extension. libsa initially sets it to be a function 38 * that uses libkld to load and link the extension from 39 * within the kernel. Once the root filesystem is up, 40 * this gets switch to the kmod_load_extension() function, 41 * which merely queues the extension for loading by the 42 * kmodload utility. 43 */ 44 extern kern_return_t (*kmod_load_function)(char *extension_name); 45 extern bool (*record_startup_extensions_function)(void); 46 extern bool (*add_from_mkext_function)(OSData * mkext); 47 extern void (*remove_startup_extension_function)(const char * name); 48 49 /**** 50 * IOCatalogue uses this variable to make a few decisions 51 * about loading and matching drivers. 52 */ 53 extern int kernelLinkerPresent; 54 55 56 class KLDBootstrap { 57 public: 58 KLDBootstrap(); 59 ~KLDBootstrap(); 60 }; 61 62 63 static KLDBootstrap bootstrap_obj; 64 65 66 /* The constructor creates a lock and puts entries into a dispatch 67 * table for functions used to record and load kmods. 68 */ 69 KLDBootstrap::KLDBootstrap() { 70 71 malloc_init(); 72 73 kmod_load_function = &load_kernel_extension; 74 75 record_startup_extensions_function = &recordStartupExtensions; 76 add_from_mkext_function = &addExtensionsFromArchive; 77 remove_startup_extension_function = &removeStartupExtension; 78 79 kernelLinkerPresent = 1; 80 } 81 82 /* The destructor frees all wired memory regions held 83 * by libsa's malloc package and disposes of the lock. 84 */ 85 KLDBootstrap::~KLDBootstrap() { 86 87 kld_file_cleanup_all_resources(); 88 89 /* Dump all device-tree entries for boot drivers, and all 90 * info on startup extensions. The IOCatalogue will now 91 * get personalities from kextd. 92 */ 93 clearStartupExtensionsAndLoaderInfo(); 94 95 /* Free all temporary malloc memory. 96 */ 97 malloc_reset(); 98 } 99