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author | Miquel Raynal <miquel.raynal@bootlin.com> | 2018-05-15 11:57:17 +0200 |
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committer | Tom Rini <trini@konsulko.com> | 2018-05-25 20:12:58 -0400 |
commit | 69cd8f0681f44c85365157e87dc6d36d17e3993d (patch) | |
tree | 7ded37c544fcd23a590a5c00e13318a2e67871e4 /lib/tpm-v2.c | |
parent | 1c4ea8f496b42c5c34634d78524937476539a8bd (diff) |
tpm: add TPM2_GetCapability command support
Add support for the TPM2_GetCapability command.
Change the command file and the help accordingly.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'lib/tpm-v2.c')
-rw-r--r-- | lib/tpm-v2.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index 7d3834c0e4..08e3ba7a3c 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -157,3 +157,36 @@ u32 tpm2_pcr_read(u32 idx, unsigned int idx_min_sz, void *data, return 0; } + +u32 tpm2_get_capability(u32 capability, u32 property, void *buf, + size_t prop_count) +{ + u8 command_v2[COMMAND_BUFFER_SIZE] = { + tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */ + tpm_u32(22), /* Length */ + tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */ + + tpm_u32(capability), /* Capability */ + tpm_u32(property), /* Property */ + tpm_u32(prop_count), /* Property count */ + }; + u8 response[COMMAND_BUFFER_SIZE]; + size_t response_len = COMMAND_BUFFER_SIZE; + unsigned int properties_off; + int ret; + + ret = tpm_sendrecv_command(command_v2, response, &response_len); + if (ret) + return ret; + + /* + * In the response buffer, the properties are located after the: + * tag (u16), response size (u32), response code (u32), + * YES/NO flag (u8), TPM_CAP (u32) and TPMU_CAPABILITIES (u32). + */ + properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) + + sizeof(u8) + sizeof(u32) + sizeof(u32); + memcpy(buf, &response[properties_off], response_len - properties_off); + + return 0; +} |