tpm: add documentation for sysfs interfaces
Reviewed-by: Peter Huewe <peter.huewe@infineon.com> Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
This commit is contained in:
Kent Yoder
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feab398e58
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What: /sys/class/misc/tpmX/device/
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Date: April 2005
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KernelVersion: 2.6.12
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Contact: tpmdd-devel@lists.sf.net
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Description: The device/ directory under a specific TPM instance exposes
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the properties of that TPM chip
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What: /sys/class/misc/tpmX/device/active
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Date: April 2006
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KernelVersion: 2.6.17
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Contact: tpmdd-devel@lists.sf.net
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Description: The "active" property prints a '1' if the TPM chip is accepting
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commands. An inactive TPM chip still contains all the state of
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an active chip (Storage Root Key, NVRAM, etc), and can be
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visible to the OS, but will only accept a restricted set of
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commands. See the TPM Main Specification part 2, Structures,
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section 17 for more information on which commands are
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available.
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What: /sys/class/misc/tpmX/device/cancel
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Date: June 2005
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KernelVersion: 2.6.13
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Contact: tpmdd-devel@lists.sf.net
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Description: The "cancel" property allows you to cancel the currently
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pending TPM command. Writing any value to cancel will call the
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TPM vendor specific cancel operation.
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What: /sys/class/misc/tpmX/device/caps
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Date: April 2005
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KernelVersion: 2.6.12
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Contact: tpmdd-devel@lists.sf.net
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Description: The "caps" property contains TPM manufacturer and version info.
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Example output:
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Manufacturer: 0x53544d20
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TCG version: 1.2
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Firmware version: 8.16
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Manufacturer is a hex dump of the 4 byte manufacturer info
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space in a TPM. TCG version shows the TCG TPM spec level that
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the chip supports. Firmware version is that of the chip and
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is manufacturer specific.
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What: /sys/class/misc/tpmX/device/durations
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Date: March 2011
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KernelVersion: 3.1
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Contact: tpmdd-devel@lists.sf.net
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Description: The "durations" property shows the 3 vendor-specific values
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used to wait for a short, medium and long TPM command. All
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TPM commands are categorized as short, medium or long in
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execution time, so that the driver doesn't have to wait
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any longer than necessary before starting to poll for a
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result.
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Example output:
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3015000 4508000 180995000 [original]
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Here the short, medium and long durations are displayed in
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usecs. "[original]" indicates that the values are displayed
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unmodified from when they were queried from the chip.
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Durations can be modified in the case where a buggy chip
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reports them in msec instead of usec and they need to be
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scaled to be displayed in usecs. In this case "[adjusted]"
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will be displayed in place of "[original]".
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What: /sys/class/misc/tpmX/device/enabled
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Date: April 2006
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KernelVersion: 2.6.17
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Contact: tpmdd-devel@lists.sf.net
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Description: The "enabled" property prints a '1' if the TPM chip is enabled,
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meaning that it should be visible to the OS. This property
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may be visible but produce a '0' after some operation that
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disables the TPM.
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What: /sys/class/misc/tpmX/device/owned
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Date: April 2006
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KernelVersion: 2.6.17
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Contact: tpmdd-devel@lists.sf.net
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Description: The "owned" property produces a '1' if the TPM_TakeOwnership
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ordinal has been executed successfully in the chip. A '0'
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indicates that ownership hasn't been taken.
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What: /sys/class/misc/tpmX/device/pcrs
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Date: April 2005
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KernelVersion: 2.6.12
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Contact: tpmdd-devel@lists.sf.net
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Description: The "pcrs" property will dump the current value of all Platform
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Configuration Registers in the TPM. Note that since these
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values may be constantly changing, the output is only valid
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for a snapshot in time.
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Example output:
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PCR-00: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
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PCR-01: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
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PCR-02: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
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PCR-03: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
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PCR-04: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
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...
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The number of PCRs and hex bytes needed to represent a PCR
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value will vary depending on TPM chip version. For TPM 1.1 and
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1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes
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long. Use the "caps" property to determine TPM version.
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What: /sys/class/misc/tpmX/device/pubek
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Date: April 2005
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KernelVersion: 2.6.12
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Contact: tpmdd-devel@lists.sf.net
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Description: The "pubek" property will return the TPM's public endorsement
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key if possible. If the TPM has had ownership established and
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is version 1.2, the pubek will not be available without the
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owner's authorization. Since the TPM driver doesn't store any
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secrets, it can't authorize its own request for the pubek,
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making it unaccessible. The public endorsement key is gener-
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ated at TPM menufacture time and exists for the life of the
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chip.
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Example output:
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Algorithm: 00 00 00 01
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Encscheme: 00 03
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Sigscheme: 00 01
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Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
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Modulus length: 256
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Modulus:
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B4 76 41 82 C9 20 2C 10 18 40 BC 8B E5 44 4C 6C
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3A B2 92 0C A4 9B 2A 83 EB 5C 12 85 04 48 A0 B6
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1E E4 81 84 CE B2 F2 45 1C F0 85 99 61 02 4D EB
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86 C4 F7 F3 29 60 52 93 6B B2 E5 AB 8B A9 09 E3
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D7 0E 7D CA 41 BF 43 07 65 86 3C 8C 13 7A D0 8B
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82 5E 96 0B F8 1F 5F 34 06 DA A2 52 C1 A9 D5 26
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0F F4 04 4B D9 3F 2D F2 AC 2F 74 64 1F 8B CD 3E
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1E 30 38 6C 70 63 69 AB E2 50 DF 49 05 2E E1 8D
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6F 78 44 DA 57 43 69 EE 76 6C 38 8A E9 8E A3 F0
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A7 1F 3C A8 D0 12 15 3E CA 0E BD FA 24 CD 33 C6
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47 AE A4 18 83 8E 22 39 75 93 86 E6 FD 66 48 B6
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10 AD 94 14 65 F9 6A 17 78 BD 16 53 84 30 BF 70
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E0 DC 65 FD 3C C6 B0 1E BF B9 C1 B5 6C EF B1 3A
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F8 28 05 83 62 26 11 DC B4 6B 5A 97 FF 32 26 B6
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F7 02 71 CF 15 AE 16 DD D1 C1 8E A8 CF 9B 50 7B
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C3 91 FF 44 1E CF 7C 39 FE 17 77 21 20 BD CE 9B
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Possible values:
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Algorithm: TPM_ALG_RSA (1)
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Encscheme: TPM_ES_RSAESPKCSv15 (2)
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TPM_ES_RSAESOAEP_SHA1_MGF1 (3)
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Sigscheme: TPM_SS_NONE (1)
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Parameters, a byte string of 3 u32 values:
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Key Length (bits): 00 00 08 00 (2048)
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Num primes: 00 00 00 02 (2)
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Exponent Size: 00 00 00 00 (0 means the
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default exp)
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Modulus Length: 256 (bytes)
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Modulus: The 256 byte Endorsement Key modulus
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What: /sys/class/misc/tpmX/device/temp_deactivated
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Date: April 2006
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KernelVersion: 2.6.17
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Contact: tpmdd-devel@lists.sf.net
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Description: The "temp_deactivated" property returns a '1' if the chip has
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been temporarily dectivated, usually until the next power
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cycle. Whether a warm boot (reboot) will clear a TPM chip
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from a temp_deactivated state is platform specific.
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What: /sys/class/misc/tpmX/device/timeouts
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Date: March 2011
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KernelVersion: 3.1
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Contact: tpmdd-devel@lists.sf.net
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Description: The "timeouts" property shows the 4 vendor-specific values
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for the TPM's interface spec timeouts. The use of these
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timeouts is defined by the TPM interface spec that the chip
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conforms to.
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Example output:
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750000 750000 750000 750000 [original]
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The four timeout values are shown in usecs, with a trailing
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"[original]" or "[adjusted]" depending on whether the values
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were scaled by the driver to be reported in usec from msecs.
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