1 /* Microsoft Reference Implementation for TPM 2.0
2 *
3 * The copyright in this software is being made available under the BSD License,
4 * included below. This software may be subject to other third party and
5 * contributor rights, including patent rights, and no such rights are granted
6 * under this license.
7 *
8 * Copyright (c) Microsoft Corporation
9 *
10 * All rights reserved.
11 *
12 * BSD License
13 *
14 * Redistribution and use in source and binary forms, with or without modification,
15 * are permitted provided that the following conditions are met:
16 *
17 * Redistributions of source code must retain the above copyright notice, this list
18 * of conditions and the following disclaimer.
19 *
20 * Redistributions in binary form must reproduce the above copyright notice, this
21 * list of conditions and the following disclaimer in the documentation and/or
22 * other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
28 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
31 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #include "Tpm.h"
36 #include "NV_SetBits_fp.h"
37
38 #if CC_NV_SetBits // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Set bits in a NV index
42 */
43 // Return Type: TPM_RC
44 // TPM_RC_ATTRIBUTES the TPMA_NV_BITS attribute is not SET in the
45 // Index referenced by 'nvIndex'
46 // TPM_RC_NV_AUTHORIZATION the authorization was valid but the
47 // authorizing entity ('authHandle')
48 // is not allowed to write to the Index
49 // referenced by 'nvIndex'
50 // TPM_RC_NV_LOCKED the Index referenced by 'nvIndex' is locked
51 // for writing
52 TPM_RC
TPM2_NV_SetBits(NV_SetBits_In * in)53 TPM2_NV_SetBits(
54 NV_SetBits_In *in // IN: input parameter list
55 )
56 {
57 TPM_RC result;
58 NV_REF locator;
59 NV_INDEX *nvIndex = NvGetIndexInfo(in->nvIndex, &locator);
60 UINT64 oldValue;
61 UINT64 newValue;
62
63 // Input Validation
64
65 // Common access checks, NvWriteAccessCheck() may return TPM_RC_NV_AUTHORIZATION
66 // or TPM_RC_NV_LOCKED
67 result = NvWriteAccessChecks(in->authHandle,
68 in->nvIndex,
69 nvIndex->publicArea.attributes);
70 if(result != TPM_RC_SUCCESS)
71 return result;
72
73 // Make sure that this is a bit field
74 if(!IsNvBitsIndex(nvIndex->publicArea.attributes))
75 return TPM_RCS_ATTRIBUTES + RC_NV_SetBits_nvIndex;
76
77 // If index is not been written, initialize it
78 if(!IS_ATTRIBUTE(nvIndex->publicArea.attributes, TPMA_NV, WRITTEN))
79 oldValue = 0;
80 else
81 // Read index data
82 oldValue = NvGetUINT64Data(nvIndex, locator);
83
84 // Figure out what the new value is going to be
85 newValue = oldValue | in->bits;
86
87 // Internal Data Update
88 return NvWriteUINT64Data(nvIndex, newValue);
89 }
90
91 #endif // CC_NV_SetBits