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Commit	Line	Data
	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	}