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 */
47extern kern_return_t (*kmod_load_function)(char *extension_name);
48extern bool (*record_startup_extensions_function)(void);
49extern bool (*add_from_mkext_function)(OSData * mkext);
50extern 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 */
56extern int kernelLinkerPresent;
57
58
59class KLDBootstrap {
60public:
61    KLDBootstrap();
62    ~KLDBootstrap();
63};
64
65
66static 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 */
72KLDBootstrap::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 */
90KLDBootstrap::~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