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 } 96