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/kmod.h> 27 #include <libsa/catalogue.h> 28 extern "C" { 29 #include <libsa/malloc.h> 30 }; 31 32 extern "C" { 33 /***** 34 * This function is used by IOCatalogue to load a kernel 35 * extension. libsa initially sets it to be a function 36 * that uses libkld to load and link the extension from 37 * within the kernel. Once the root filesystem is up, 38 * this gets switch to the kmod_load_extension() function, 39 * which merely queues the extension for loading by the 40 * kmodload utility. 41 */ 42 extern kern_return_t (*kmod_load_function)(char *extension_name); 43 extern bool (*record_startup_extensions_function)(void); 44 extern bool (*add_from_mkext_function)(OSData * mkext); 45 extern void (*remove_startup_extension_function)(const char * name); 46 47 /**** 48 * IOCatalogue uses this variable to make a few decisions 49 * about loading and matching drivers. 50 */ 51 extern int kernelLinkerPresent; 52 53 extern IOLock * kld_lock; 54 }; 55 56 57 class KLDBootstrap { 58 public: 59 KLDBootstrap(); 60 ~KLDBootstrap(); 61 }; 62 63 64 static KLDBootstrap bootstrap_obj; 65 66 67 /* The constructor creates a lock and puts entries into a dispatch 68 * table for functions used to record and load kmods. 69 */ 70 KLDBootstrap::KLDBootstrap() { 71 72 kld_lock = IOLockAlloc(); 73 IOLockLock(kld_lock); 74 75 kmod_load_function = &load_kernel_extension; 76 77 record_startup_extensions_function = &recordStartupExtensions; 78 add_from_mkext_function = &addExtensionsFromArchive; 79 remove_startup_extension_function = &removeStartupExtension; 80 81 kernelLinkerPresent = 1; 82 83 IOLockUnlock(kld_lock); 84 } 85 86 /* The destructor frees all wired memory regions held 87 * by libsa's malloc package and disposes of the lock. 88 */ 89 KLDBootstrap::~KLDBootstrap() { 90 91 OSDictionary * startupExtensions; 92 93 IOLockLock(kld_lock); 94 95 malloc_reset(); 96 97 startupExtensions = getStartupExtensions(); 98 if (startupExtensions) startupExtensions->release(); 99 100 IOLockUnlock(kld_lock); 101 IOLockFree(kld_lock); 102 103 } 104