diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/tpm2_marshaling.c | 37 | ||||
| -rw-r--r-- | src/lib/tpm2_tlcl.c | 20 | ||||
| -rw-r--r-- | src/lib/tpm2_tlcl_structures.h | 9 |
3 files changed, 66 insertions, 0 deletions
diff --git a/src/lib/tpm2_marshaling.c b/src/lib/tpm2_marshaling.c index dd046d27a1..6d4d622d91 100644 --- a/src/lib/tpm2_marshaling.c +++ b/src/lib/tpm2_marshaling.c @@ -390,6 +390,33 @@ static void marshal_hierarchy_control(void **buffer, marshal_u8(buffer, command_body->state, buffer_space); } +static void marshal_cr50_vendor_command(void **buffer, void *command_body, + size_t *buffer_space) +{ + uint16_t *sub_command; + + /* Ensure at least the sub command can fit in the body and there's + valid pointer. Could be reading past the buffer... */ + if (command_body == NULL || *buffer_space < sizeof(uint16_t)) { + *buffer_space = 0; + return; + } + + sub_command = command_body; + + switch (*sub_command) { + case TPM2_CR50_SUB_CMD_NVMEM_ENABLE_COMMITS: + marshal_u16(buffer, *sub_command, buffer_space); + break; + default: + /* Unsupported subcommand. */ + printk(BIOS_WARNING, "Unsupported cr50 subcommand: 0x%04x\n", + *sub_command); + *buffer_space = 0; + break; + } +} + int tpm_marshal_command(TPM_CC command, void *tpm_command_body, void *buffer, size_t buffer_size) { @@ -444,6 +471,11 @@ int tpm_marshal_command(TPM_CC command, void *tpm_command_body, marshal_pcr_extend(&cmd_body, tpm_command_body, &body_size); break; + case TPM2_CR50_VENDOR_COMMAND: + marshal_cr50_vendor_command(&cmd_body, tpm_command_body, + &body_size); + break; + default: body_size = 0; printk(BIOS_INFO, "%s:%d:Request to marshal unsupported command %#x\n", @@ -615,6 +647,11 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, cr_size = 0; break; + case TPM2_CR50_VENDOR_COMMAND: + /* Assume no other data returned for the time being. */ + cr_size = 0; + break; + default: { int i; diff --git a/src/lib/tpm2_tlcl.c b/src/lib/tpm2_tlcl.c index 3d65a95e97..86cc74d425 100644 --- a/src/lib/tpm2_tlcl.c +++ b/src/lib/tpm2_tlcl.c @@ -385,3 +385,23 @@ uint32_t tlcl_disable_platform_hierarchy(void) return TPM_SUCCESS; } + +uint32_t tlcl_cr50_enable_nvcommits(void) +{ + uint16_t sub_command = TPM2_CR50_SUB_CMD_NVMEM_ENABLE_COMMITS; + struct tpm2_response *response; + + printk(BIOS_INFO, "Enabling cr50 nvmem commmits\n"); + + response = tpm_process_command(TPM2_CR50_VENDOR_COMMAND, &sub_command); + + if (response == NULL || (response && response->hdr.tpm_code)) { + if (response) + printk(BIOS_INFO, "%s: failed %x\n", __func__, + response->hdr.tpm_code); + else + printk(BIOS_INFO, "%s: failed\n", __func__); + return TPM_E_IOERROR; + } + return TPM_SUCCESS; +} diff --git a/src/lib/tpm2_tlcl_structures.h b/src/lib/tpm2_tlcl_structures.h index c5c6d87985..ec5b674701 100644 --- a/src/lib/tpm2_tlcl_structures.h +++ b/src/lib/tpm2_tlcl_structures.h @@ -69,6 +69,15 @@ struct tpm_header { #define TPM2_NV_Read ((TPM_CC)0x0000014E) #define TPM2_GetCapability ((TPM_CC)0x0000017A) #define TPM2_PCR_Extend ((TPM_CC)0x00000182) +/* TPM2 specifies vendor commands need to have this bit set. Vendor command + space is defined by the lower 16 bits. */ +#define TPM_CC_VENDOR_BIT_MASK 0x20000000 +/* FIXME: below is not enough to differentiate between vendors commands + of numerous devices. However, the current tpm2 APIs aren't very amenable + to extending generically because the marshaling code is assuming all + knowledge of all commands. */ +#define TPM2_CR50_VENDOR_COMMAND ((TPM_CC)(TPM_CC_VENDOR_BIT_MASK | 0)) +#define TPM2_CR50_SUB_CMD_NVMEM_ENABLE_COMMITS (21) /* Startup values. */ #define TPM_SU_CLEAR 0 |