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 #ifndef CONFIG_NOKLD 83 kernelLinkerPresent = 1; 84 #endif 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 } 104