diff options
| author | Subrata Banik <subratabanik@google.com> | 2023-12-27 20:59:41 +0530 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2023-12-31 03:18:42 +0000 |
| commit | 0f90c5d5f9faa31b53da6680175da19f9d8efbfa (patch) | |
| tree | 3dc9b823907a2f6f36820fcdd2a673b0c7468e43 /src/security/tpm/tss/vendor/cr50 | |
| parent | acf10d6096460874785ab951c75589c133afb66f (diff) | |
security/tpm: Retrieve factory configuration for device w/ Google TPM
This patch enables retrieval of factory configuration data from
Google TPM devices (both Cr50 and Ti50).
This patch utilizes vendor-specific command
TPM2_CR50_SUB_CMD_GET_FACTORY_CONFIG (68).
The factory config space is a 64-bit, one-time programmable.
For the unprovisioned one, the read will be 0x0.
BUG=b:317880956
TEST=Able to retrieve the factory config from google/screebo.
Change-Id: Ifd0e850770152a03aa46d7f8bbb76f7520a59081
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79736
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/security/tpm/tss/vendor/cr50')
| -rw-r--r-- | src/security/tpm/tss/vendor/cr50/cr50.c | 28 | ||||
| -rw-r--r-- | src/security/tpm/tss/vendor/cr50/cr50.h | 9 |
2 files changed, 37 insertions, 0 deletions
diff --git a/src/security/tpm/tss/vendor/cr50/cr50.c b/src/security/tpm/tss/vendor/cr50/cr50.c index 87889d128b..31eab2d5d4 100644 --- a/src/security/tpm/tss/vendor/cr50/cr50.c +++ b/src/security/tpm/tss/vendor/cr50/cr50.c @@ -176,3 +176,31 @@ tpm_result_t tlcl_cr50_reset_ec(void) return TPM_SUCCESS; } + +tpm_result_t tlcl_cr50_get_factory_config(uint64_t *factory_config) +{ + struct tpm2_response *response; + uint16_t factory_config_command = TPM2_CR50_SUB_CMD_GET_FACTORY_CONFIG; + *factory_config = 0; + + response = tpm_process_command(TPM2_CR50_VENDOR_COMMAND, &factory_config_command); + + if (!response) + return TPM_IOERROR; + + /* Explicitly inform caller when command is not supported */ + if (response->hdr.tpm_code == VENDOR_RC_NO_SUCH_COMMAND || + response->hdr.tpm_code == VENDOR_RC_NO_SUCH_SUBCOMMAND) + return TPM_CB_NO_SUCH_COMMAND; + + /* Unexpected return code from TPM */ + if (response->hdr.tpm_code) + return TPM_IOERROR; + + /* TPM command completed without error */ + *factory_config = response->vcr.factory_config; + + printk(BIOS_INFO, "Reading factory config = %016" PRIX64 "\n", *factory_config); + + return TPM_SUCCESS; +} diff --git a/src/security/tpm/tss/vendor/cr50/cr50.h b/src/security/tpm/tss/vendor/cr50/cr50.h index edd5083d17..f7e5c68332 100644 --- a/src/security/tpm/tss/vendor/cr50/cr50.h +++ b/src/security/tpm/tss/vendor/cr50/cr50.h @@ -17,6 +17,7 @@ #define TPM2_CR50_SUB_CMD_TPM_MODE (40) #define TPM2_CR50_SUB_CMD_GET_BOOT_MODE (52) #define TPM2_CR50_SUB_CMD_RESET_EC (53) +#define TPM2_CR50_SUB_CMD_GET_FACTORY_CONFIG (68) /* Cr50 vendor-specific error codes. */ #define VENDOR_RC_ERR 0x00000500 @@ -105,4 +106,12 @@ tpm_result_t tlcl_cr50_immediate_reset(uint16_t timeout_ms); */ tpm_result_t tlcl_cr50_reset_ec(void); +/** + * TPM command to get the factory config. + * + * Returns TPM_* for errors. + * On Success, TPM_SUCCESS if factory config is successfully retrieved. + */ +tpm_result_t tlcl_cr50_get_factory_config(uint64_t *factory_config); + #endif /* CR50_TSS_STRUCTURES_H_ */ |