Implement this API function for TPM2.
Signed-off-by: Simon Glass sjg@chromium.org Acked-by: Ilias Apalodimas ilias.apalodimas@linaro.org ---
(no changes since v1)
include/tpm-v2.h | 12 ++++++++++++ lib/tpm-v2.c | 23 +++++++++++++++++++++++ lib/tpm_api.c | 2 +- 3 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/include/tpm-v2.h b/include/tpm-v2.h index 6a400771af1..1ca1e7e2011 100644 --- a/include/tpm-v2.h +++ b/include/tpm-v2.h @@ -241,6 +241,7 @@ enum tpm2_command_codes { TPM2_CC_NV_DEFINE_SPACE = 0x012a, TPM2_CC_PCR_SETAUTHPOL = 0x012C, TPM2_CC_NV_WRITE = 0x0137, + TPM2_CC_NV_WRITELOCK = 0x0138, TPM2_CC_DAM_RESET = 0x0139, TPM2_CC_DAM_PARAMETERS = 0x013A, TPM2_CC_NV_READ = 0x014E, @@ -570,4 +571,15 @@ u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw, */ u32 tpm2_get_random(struct udevice *dev, void *data, u32 count);
+/** + * Lock data in the TPM + * + * Once locked the data cannot be written until after a reboot + * + * @dev TPM device + * @index Index of data to lock + * @return code of the operation + */ +u32 tpm2_write_lock(struct udevice *dev, u32 index); + #endif /* __TPM_V2_H */ diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index 9f1699131e1..b796004930e 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -601,3 +601,26 @@ u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
return 0; } + +u32 tpm2_write_lock(struct udevice *dev, u32 index) +{ + u8 command_v2[COMMAND_BUFFER_SIZE] = { + /* header 10 bytes */ + tpm_u16(TPM2_ST_SESSIONS), /* TAG */ + tpm_u32(10 + 8 + 13), /* Length */ + tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */ + + /* handles 8 bytes */ + tpm_u32(TPM2_RH_PLATFORM), /* Primary platform seed */ + tpm_u32(HR_NV_INDEX + index), /* Password authorisation */ + + /* session header 9 bytes */ + tpm_u32(9), /* Header size */ + tpm_u32(TPM2_RS_PW), /* Password authorisation */ + tpm_u16(0), /* nonce_size */ + 0, /* session_attrs */ + tpm_u16(0), /* auth_size */ + }; + + return tpm_sendrecv_command(dev, command_v2, NULL, NULL); +} diff --git a/lib/tpm_api.c b/lib/tpm_api.c index 687fc8bc7ee..4c662640a92 100644 --- a/lib/tpm_api.c +++ b/lib/tpm_api.c @@ -144,7 +144,7 @@ u32 tpm_write_lock(struct udevice *dev, u32 index) if (is_tpm1(dev)) return -ENOSYS; else if (is_tpm2(dev)) - return -ENOSYS; + return tpm2_write_lock(dev, index); else return -ENOSYS; }