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 //** Includes and Function Prototypes
36
37 #include "PlatformData.h"
38 #include "Platform_fp.h"
39 #include "_TPM_Init_fp.h"
40
41 //** Functions
42
43 //***_plat__Signal_PowerOn()
44 // Signal platform power on
45 LIB_EXPORT int
_plat__Signal_PowerOn(void)46 _plat__Signal_PowerOn(
47 void
48 )
49 {
50 // Reset the timer
51 _plat__TimerReset();
52
53 // Need to indicate that we lost power
54 s_powerLost = TRUE;
55
56 return 0;
57 }
58
59 //*** _plat__WasPowerLost()
60 // Test whether power was lost before a _TPM_Init.
61 //
62 // This function will clear the "hardware" indication of power loss before return.
63 // This means that there can only be one spot in the TPM code where this value
64 // gets read. This method is used here as it is the most difficult to manage in the
65 // TPM code and, if the hardware actually works this way, it is hard to make it
66 // look like anything else. So, the burden is placed on the TPM code rather than the
67 // platform code
68 // return type: int
69 // TRUE(1) power was lost
70 // FALSE(0) power was not lost
71 LIB_EXPORT int
_plat__WasPowerLost(void)72 _plat__WasPowerLost(
73 void
74 )
75 {
76 BOOL retVal = s_powerLost;
77 s_powerLost = FALSE;
78 return retVal;
79 }
80
81 //*** _plat_Signal_Reset()
82 // This a TPM reset without a power loss.
83 LIB_EXPORT int
_plat__Signal_Reset(void)84 _plat__Signal_Reset(
85 void
86 )
87 {
88 // Initialize locality
89 s_locality = 0;
90
91 // Command cancel
92 s_isCanceled = FALSE;
93
94 _TPM_Init();
95
96 // if we are doing reset but did not have a power failure, then we should
97 // not need to reload NV ...
98
99 return 0;
100 }
101
102 //***_plat__Signal_PowerOff()
103 // Signal platform power off
104 LIB_EXPORT void
_plat__Signal_PowerOff(void)105 _plat__Signal_PowerOff(
106 void
107 )
108 {
109 // Prepare NV memory for power off
110 _plat__NVDisable();
111
112 return;
113 }