Documentation/ABI/stable/sysfs-class-tpm

   1 What:           /sys/class/misc/tpmX/device/
   2 Date:           April 2005
   3 KernelVersion:  2.6.12
   4 Contact:        tpmdd-devel@lists.sf.net
   5 Description:    The device/ directory under a specific TPM instance exposes
   6                 the properties of that TPM chip
   7
   8
   9 What:           /sys/class/misc/tpmX/device/active
  10 Date:           April 2006
  11 KernelVersion:  2.6.17
  12 Contact:        tpmdd-devel@lists.sf.net
  13 Description:    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
  21 What:           /sys/class/misc/tpmX/device/cancel
  22 Date:           June 2005
  23 KernelVersion:  2.6.13
  24 Contact:        tpmdd-devel@lists.sf.net
  25 Description:    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
  29 What:           /sys/class/misc/tpmX/device/caps
  30 Date:           April 2005
  31 KernelVersion:  2.6.12
  32 Contact:        tpmdd-devel@lists.sf.net
  33 Description:    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
  46 What:           /sys/class/misc/tpmX/device/durations
  47 Date:           March 2011
  48 KernelVersion:  3.1
  49 Contact:        tpmdd-devel@lists.sf.net
  50 Description:    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
  69 What:           /sys/class/misc/tpmX/device/enabled
  70 Date:           April 2006
  71 KernelVersion:  2.6.17
  72 Contact:        tpmdd-devel@lists.sf.net
  73 Description:    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
  78 What:           /sys/class/misc/tpmX/device/owned
  79 Date:           April 2006
  80 KernelVersion:  2.6.17
  81 Contact:        tpmdd-devel@lists.sf.net
  82 Description:    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
  86 What:           /sys/class/misc/tpmX/device/pcrs
  87 Date:           April 2005
  88 KernelVersion:  2.6.12
  89 Contact:        tpmdd-devel@lists.sf.net
  90 Description:    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
 109 What:           /sys/class/misc/tpmX/device/pubek
 110 Date:           April 2005
 111 KernelVersion:  2.6.12
 112 Contact:        tpmdd-devel@lists.sf.net
 113 Description:    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
 161 What:           /sys/class/misc/tpmX/device/temp_deactivated
 162 Date:           April 2006
 163 KernelVersion:  2.6.17
 164 Contact:        tpmdd-devel@lists.sf.net
 165 Description:    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
 170 What:           /sys/class/misc/tpmX/device/timeouts
 171 Date:           March 2011
 172 KernelVersion:  3.1
 173 Contact:        tpmdd-devel@lists.sf.net
 174 Description:    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.