1/*
2 * Copyright (c) 2010 Apple 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
29#include <sys/cdefs.h>
30#include <stdbool.h>
31
32#include <IOKit/assert.h>
33#include <IOKit/system.h>
34#include <IOKit/IOLib.h>
35#include <IOKit/IOMemoryDescriptor.h>
36#include <IOKit/IOKitDebug.h>
37
38__BEGIN_DECLS
39
40#include <pexpert/pexpert.h>
41
42static volatile UInt32 alreadyFetched = 0;
43static IOMemoryDescriptor * newData;
44
45IOMemoryDescriptor *
46IOGetBootKeyStoreData(void);
47void
48IOSetKeyStoreData(IOMemoryDescriptor * data);
49
50__END_DECLS
51
52#if 1
53#define DEBG(fmt, args...)  	{ kprintf(fmt, ## args); }
54#else
55#define DEBG(fmt, args...)  	{}
56#endif
57
58void
59IOSetKeyStoreData(IOMemoryDescriptor * data)
60{
61    newData = data;
62    alreadyFetched = 0;
63}
64
65IOMemoryDescriptor *
66IOGetBootKeyStoreData(void)
67{
68  IOMemoryDescriptor *memoryDescriptor;
69  boot_args *args = (boot_args *)PE_state.bootArgs;
70  IOOptionBits options;
71  IOAddressRange ranges;
72
73  if (!OSCompareAndSwap(0, 1, &alreadyFetched))
74    return (NULL);
75
76  if (newData)
77  {
78    IOMemoryDescriptor * data = newData;
79    newData = NULL;
80    return (data);
81  }
82
83  DEBG("%s: data at address %u size %u\n", __func__,
84       args->keyStoreDataStart,
85       args->keyStoreDataSize);
86
87  if (args->keyStoreDataStart == 0)
88    return (NULL);
89
90  ranges.address = args->keyStoreDataStart;
91  ranges.length = args->keyStoreDataSize;
92
93  options = kIODirectionInOut | kIOMemoryTypePhysical64 | kIOMemoryMapperNone;
94
95  memoryDescriptor = IOMemoryDescriptor::withOptions(&ranges,
96						     1,
97						     0,
98						     NULL,
99						     options);
100
101  DEBG("%s: memory descriptor %p\n", __func__, memoryDescriptor);
102
103  return memoryDescriptor;
104}
105