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Jarkko Sakkinen313d21e2014-12-12 11:46:37 -08001What: /sys/class/tpm/tpmX/device/
Kent Yoderfeab3982012-11-07 17:00:45 -06002Date: April 2005
3KernelVersion: 2.6.12
4Contact: tpmdd-devel@lists.sf.net
5Description: The device/ directory under a specific TPM instance exposes
6 the properties of that TPM chip
7
8
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -08009What: /sys/class/tpm/tpmX/device/active
Kent Yoderfeab3982012-11-07 17:00:45 -060010Date: April 2006
11KernelVersion: 2.6.17
12Contact: tpmdd-devel@lists.sf.net
13Description: The "active" property prints a '1' if the TPM chip is accepting
14 commands. An inactive TPM chip still contains all the state of
15 an active chip (Storage Root Key, NVRAM, etc), and can be
16 visible to the OS, but will only accept a restricted set of
17 commands. See the TPM Main Specification part 2, Structures,
18 section 17 for more information on which commands are
19 available.
20
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080021What: /sys/class/tpm/tpmX/device/cancel
Kent Yoderfeab3982012-11-07 17:00:45 -060022Date: June 2005
23KernelVersion: 2.6.13
24Contact: tpmdd-devel@lists.sf.net
25Description: The "cancel" property allows you to cancel the currently
26 pending TPM command. Writing any value to cancel will call the
27 TPM vendor specific cancel operation.
28
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080029What: /sys/class/tpm/tpmX/device/caps
Kent Yoderfeab3982012-11-07 17:00:45 -060030Date: April 2005
31KernelVersion: 2.6.12
32Contact: tpmdd-devel@lists.sf.net
33Description: The "caps" property contains TPM manufacturer and version info.
34
35 Example output:
36
37 Manufacturer: 0x53544d20
38 TCG version: 1.2
39 Firmware version: 8.16
40
41 Manufacturer is a hex dump of the 4 byte manufacturer info
42 space in a TPM. TCG version shows the TCG TPM spec level that
43 the chip supports. Firmware version is that of the chip and
44 is manufacturer specific.
45
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080046What: /sys/class/tpm/tpmX/device/durations
Kent Yoderfeab3982012-11-07 17:00:45 -060047Date: March 2011
48KernelVersion: 3.1
49Contact: tpmdd-devel@lists.sf.net
50Description: The "durations" property shows the 3 vendor-specific values
51 used to wait for a short, medium and long TPM command. All
52 TPM commands are categorized as short, medium or long in
53 execution time, so that the driver doesn't have to wait
54 any longer than necessary before starting to poll for a
55 result.
56
57 Example output:
58
59 3015000 4508000 180995000 [original]
60
61 Here the short, medium and long durations are displayed in
62 usecs. "[original]" indicates that the values are displayed
63 unmodified from when they were queried from the chip.
64 Durations can be modified in the case where a buggy chip
65 reports them in msec instead of usec and they need to be
66 scaled to be displayed in usecs. In this case "[adjusted]"
67 will be displayed in place of "[original]".
68
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080069What: /sys/class/tpm/tpmX/device/enabled
Kent Yoderfeab3982012-11-07 17:00:45 -060070Date: April 2006
71KernelVersion: 2.6.17
72Contact: tpmdd-devel@lists.sf.net
73Description: The "enabled" property prints a '1' if the TPM chip is enabled,
74 meaning that it should be visible to the OS. This property
75 may be visible but produce a '0' after some operation that
76 disables the TPM.
77
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080078What: /sys/class/tpm/tpmX/device/owned
Kent Yoderfeab3982012-11-07 17:00:45 -060079Date: April 2006
80KernelVersion: 2.6.17
81Contact: tpmdd-devel@lists.sf.net
82Description: The "owned" property produces a '1' if the TPM_TakeOwnership
83 ordinal has been executed successfully in the chip. A '0'
84 indicates that ownership hasn't been taken.
85
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -080086What: /sys/class/tpm/tpmX/device/pcrs
Kent Yoderfeab3982012-11-07 17:00:45 -060087Date: April 2005
88KernelVersion: 2.6.12
89Contact: tpmdd-devel@lists.sf.net
90Description: The "pcrs" property will dump the current value of all Platform
91 Configuration Registers in the TPM. Note that since these
92 values may be constantly changing, the output is only valid
93 for a snapshot in time.
94
95 Example output:
96
97 PCR-00: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
98 PCR-01: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
99 PCR-02: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
100 PCR-03: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
101 PCR-04: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
102 ...
103
104 The number of PCRs and hex bytes needed to represent a PCR
105 value will vary depending on TPM chip version. For TPM 1.1 and
106 1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes
107 long. Use the "caps" property to determine TPM version.
108
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -0800109What: /sys/class/tpm/tpmX/device/pubek
Kent Yoderfeab3982012-11-07 17:00:45 -0600110Date: April 2005
111KernelVersion: 2.6.12
112Contact: tpmdd-devel@lists.sf.net
113Description: The "pubek" property will return the TPM's public endorsement
114 key if possible. If the TPM has had ownership established and
115 is version 1.2, the pubek will not be available without the
116 owner's authorization. Since the TPM driver doesn't store any
117 secrets, it can't authorize its own request for the pubek,
118 making it unaccessible. The public endorsement key is gener-
119 ated at TPM menufacture time and exists for the life of the
120 chip.
121
122 Example output:
123
124 Algorithm: 00 00 00 01
125 Encscheme: 00 03
126 Sigscheme: 00 01
127 Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
128 Modulus length: 256
129 Modulus:
130 B4 76 41 82 C9 20 2C 10 18 40 BC 8B E5 44 4C 6C
131 3A B2 92 0C A4 9B 2A 83 EB 5C 12 85 04 48 A0 B6
132 1E E4 81 84 CE B2 F2 45 1C F0 85 99 61 02 4D EB
133 86 C4 F7 F3 29 60 52 93 6B B2 E5 AB 8B A9 09 E3
134 D7 0E 7D CA 41 BF 43 07 65 86 3C 8C 13 7A D0 8B
135 82 5E 96 0B F8 1F 5F 34 06 DA A2 52 C1 A9 D5 26
136 0F F4 04 4B D9 3F 2D F2 AC 2F 74 64 1F 8B CD 3E
137 1E 30 38 6C 70 63 69 AB E2 50 DF 49 05 2E E1 8D
138 6F 78 44 DA 57 43 69 EE 76 6C 38 8A E9 8E A3 F0
139 A7 1F 3C A8 D0 12 15 3E CA 0E BD FA 24 CD 33 C6
140 47 AE A4 18 83 8E 22 39 75 93 86 E6 FD 66 48 B6
141 10 AD 94 14 65 F9 6A 17 78 BD 16 53 84 30 BF 70
142 E0 DC 65 FD 3C C6 B0 1E BF B9 C1 B5 6C EF B1 3A
143 F8 28 05 83 62 26 11 DC B4 6B 5A 97 FF 32 26 B6
144 F7 02 71 CF 15 AE 16 DD D1 C1 8E A8 CF 9B 50 7B
145 C3 91 FF 44 1E CF 7C 39 FE 17 77 21 20 BD CE 9B
146
147 Possible values:
148
149 Algorithm: TPM_ALG_RSA (1)
150 Encscheme: TPM_ES_RSAESPKCSv15 (2)
151 TPM_ES_RSAESOAEP_SHA1_MGF1 (3)
152 Sigscheme: TPM_SS_NONE (1)
153 Parameters, a byte string of 3 u32 values:
154 Key Length (bits): 00 00 08 00 (2048)
155 Num primes: 00 00 00 02 (2)
156 Exponent Size: 00 00 00 00 (0 means the
157 default exp)
158 Modulus Length: 256 (bytes)
159 Modulus: The 256 byte Endorsement Key modulus
160
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -0800161What: /sys/class/tpm/tpmX/device/temp_deactivated
Kent Yoderfeab3982012-11-07 17:00:45 -0600162Date: April 2006
163KernelVersion: 2.6.17
164Contact: tpmdd-devel@lists.sf.net
165Description: The "temp_deactivated" property returns a '1' if the chip has
166 been temporarily dectivated, usually until the next power
167 cycle. Whether a warm boot (reboot) will clear a TPM chip
168 from a temp_deactivated state is platform specific.
169
Jarkko Sakkinen313d21e2014-12-12 11:46:37 -0800170What: /sys/class/tpm/tpmX/device/timeouts
Kent Yoderfeab3982012-11-07 17:00:45 -0600171Date: March 2011
172KernelVersion: 3.1
173Contact: tpmdd-devel@lists.sf.net
174Description: The "timeouts" property shows the 4 vendor-specific values
175 for the TPM's interface spec timeouts. The use of these
176 timeouts is defined by the TPM interface spec that the chip
177 conforms to.
178
179 Example output:
180
181 750000 750000 750000 750000 [original]
182
183 The four timeout values are shown in usecs, with a trailing
184 "[original]" or "[adjusted]" depending on whether the values
185 were scaled by the driver to be reported in usec from msecs.