/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include "tpm_ppi.h" #define BCD(x, y) (((x) << 4) | ((y) << 0)) static void set_package_element_op(const char *package_name, unsigned int element, uint8_t src_op) { acpigen_write_store(); acpigen_emit_byte(src_op); acpigen_emit_byte(INDEX_OP); acpigen_emit_namestring(package_name); acpigen_write_integer(element); acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */ } static void set_package_element_name(const char *package_name, unsigned int element, const char *src) { acpigen_write_store(); acpigen_emit_namestring(src); acpigen_emit_byte(INDEX_OP); acpigen_emit_namestring(package_name); acpigen_write_integer(element); acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */ } /* PPI function is passed in src_op. Converted to Local2. Clobbers Local1 and Local2 */ static void verify_supported_ppi(uint8_t src_op) { /* * Old OSes incorrectly pass a Buffer instead of a Package. * See TCG Physical Presence Interface Specification Chapter 8.1.2 for details. */ /* If (ObjectType(Arg3) == Package) */ acpigen_write_store(); acpigen_emit_byte(OBJ_TYPE_OP); acpigen_emit_byte(src_op); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 4); acpigen_get_package_op_element(src_op, 0, LOCAL2_OP); acpigen_pop_len(); /* If (ObjectType(Arg3) == Buffer) */ acpigen_write_store(); acpigen_emit_byte(OBJ_TYPE_OP); acpigen_emit_byte(src_op); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 3); acpigen_write_to_integer(src_op, LOCAL2_OP); acpigen_pop_len(); /* Check if it's a valid PPI function */ acpigen_write_store(); acpigen_emit_namestring("^FSUP"); acpigen_emit_byte(LOCAL2_OP); acpigen_emit_byte(CONFIG(TPM1) ? ONE_OP : ZERO_OP); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 0); /* * Note: Must fake success for 1-4, 6-13, 15-16, 19-20 * see "Trusted Execution Environment ACPI Profile" * * Even if not available, the TPM 1.2 PPI must be advertised as * supported. Tests showed that Windows relies on it, even when * a TPM2.0 is present! * The functions aren't actually used when a TPM2.0 is present... * Without this the Windows TPM 2.0 stack refuses to work. */ /* * Check if we have TPM1.2 but a TPM2 PPI function was called * or if we have TPM2.0 but a TPM1.2 PPI function was called. */ acpigen_write_store(); acpigen_emit_namestring("^FSUP"); acpigen_emit_byte(LOCAL2_OP); acpigen_emit_byte(CONFIG(TPM1) ? ZERO_OP : ONE_OP); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 1); acpigen_write_return_integer(PPI2_RET_SUCCESS); /* As per TPM spec */ acpigen_pop_len(); acpigen_write_return_integer(PPI2_RET_NOT_SUPPORTED); acpigen_pop_len(); } /* TPM PPI functions */ static void tpm_ppi_func0_cb(void *arg) { /* Functions 1-8. */ u8 buf[] = {0xff, 0x01}; acpigen_write_return_byte_buffer(buf, 2); } /* * PPI 1.0: 2.1.1 Get Physical Presence Interface Version * * Arg2 (Integer): Function Index = 1 * Arg3 (Package): Arguments = Empty Package * * Returns: Type: String */ static void tpm_ppi_func1_cb(void *arg) { if (CONFIG(TPM2)) /* Interface version: 1.3 */ acpigen_write_return_string("1.3"); else /* Interface version: 1.2 */ acpigen_write_return_string("1.2"); } /* * Submit TPM Operation Request to Pre-OS Environment [Windows optional] * PPI 1.0: 2.1.3 Submit TPM Operation Request to Pre-OS Environment * * Supported Revisions: 1 * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 2 * Arg3 (Package): Arguments = Package: Type: Integer * Operation Value of the Request * * Returns: Type: Integer * 0: Success * 1: Operation Value of the Request Not Supported * 2: General Failure */ static void tpm_ppi_func2_cb(void *arg) { /* Revision 1 */ acpigen_write_to_integer(ARG1_OP, LOCAL0_OP); acpigen_write_if_lequal_op_int(LOCAL0_OP, 1); /* Local2 = ConvertAndVerify(Arg3) */ verify_supported_ppi(ARG3_OP); acpigen_write_store_op_to_namestr(LOCAL2_OP, "^CMDR"); acpigen_write_store_op_to_namestr(ZERO_OP, "^OARG"); acpigen_write_store_op_to_namestr(ZERO_OP, "^USER"); acpigen_write_return_integer(PPI2_RET_SUCCESS); acpigen_pop_len(); acpigen_write_return_integer(PPI2_RET_GENERAL_FAILURE); } /* * PPI 1.0: 2.1.4 Get Pending TPM Operation Requested By the OS * * Supported Revisions: 1, 2 * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 3 * Arg3 (Package): Empty package * * Returns: Type: Package(Integer, Integer, Integer (optional)) * Integer 1: * 0: Success * 1: General Failure * Integer 2: * Pending TPM operation requested by OS * Integer 3: * Pending TPM operation argument requested by OS */ static void tpm_ppi_func3_cb(void *arg) { acpigen_write_store(); acpigen_write_integer(PPI3_RET_GENERAL_FAILURE); acpigen_emit_byte(LOCAL0_OP); /* ^TPM3 [0] = PPI3_RET_GENERAL_FAILURE */ set_package_element_op("^TPM3", 0, LOCAL0_OP); /* ^TPM2 [0] = PPI3_RET_GENERAL_FAILURE */ set_package_element_op("^TPM2", 0, LOCAL0_OP); acpigen_write_to_integer(ARG1_OP, LOCAL0_OP); /* Revision 1 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 1); /* ^TPM2 [0] = PPI3_RET_SUCCESS */ acpigen_write_store(); acpigen_write_integer(PPI3_RET_SUCCESS); acpigen_emit_byte(LOCAL1_OP); set_package_element_op("^TPM2", 0, LOCAL1_OP); /* ^TPM2 [1] = ^CMDR */ set_package_element_name("^TPM2", 1, "^CMDR"); acpigen_emit_byte(RETURN_OP); acpigen_emit_namestring("^TPM2"); acpigen_pop_len(); /* * A return value of {0, 23, 1} indicates that operation 23 * with argument 1 is pending. */ /* Revision 2 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 2); /* ^TPM3 [0] = PPI3_RET_SUCCESS */ acpigen_write_store(); acpigen_write_integer(PPI3_RET_SUCCESS); acpigen_emit_byte(LOCAL1_OP); set_package_element_op("^TPM3", 0, LOCAL1_OP); /* ^TPM3 [1] = ^CMDR */ set_package_element_name("^TPM3", 1, "^CMDR"); /* ^TPM3 [2] = ^OARG */ set_package_element_name("^TPM3", 2, "^OARG"); acpigen_emit_byte(RETURN_OP); acpigen_emit_namestring("^TPM3"); acpigen_pop_len(); acpigen_emit_byte(RETURN_OP); acpigen_emit_namestring("^TPM3"); } /* * PPI 1.0: 2.1.5 Get Platform-Specific Action to Transition to Pre-OS Environment * * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 4 * Arg3 (Package): Empty package * * Returns: Type: Integer * 0: None * 1: Shutdown * 2: Reboot * 3: Vendor specific */ static void tpm_ppi_func4_cb(void *arg) { /* Pre-OS transition method: reboot. */ acpigen_write_return_byte(PPI4_RET_REBOOT); } /* * PPI 1.0: 2.1.6 Return TPM Operation Response to OS Environment * * Supported Revisions: 1 * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 5 * Arg3 (Package): Empty package * * Returns: Type: Package(Integer, Integer, Integer) * Integer 1: * 0: Success * 1: General Failure * Integer 2: * Most recent TPM operation requested by OS * Integer 3: * Response to most recent TPM operation requested by OS */ static void tpm_ppi_func5_cb(void *arg) { /* ^TPM3 [0] = PPI5_RET_GENERAL_FAILURE */ acpigen_write_store(); acpigen_write_integer(PPI5_RET_GENERAL_FAILURE); acpigen_emit_byte(LOCAL1_OP); set_package_element_op("^TPM3", 0, LOCAL1_OP); acpigen_write_to_integer(ARG1_OP, LOCAL0_OP); /* Revision 1 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 1); /* ^TPM3 [0] = PPI5_RET_SUCCESS */ acpigen_write_store(); acpigen_write_integer(PPI5_RET_SUCCESS); acpigen_emit_byte(LOCAL1_OP); set_package_element_op("^TPM3", 0, LOCAL1_OP); /* ^TPM3 [1] = ^LCMD */ set_package_element_name("^TPM3", 1, "^LCMD"); /* ^TPM3 [2] = ^RESU */ set_package_element_name("^TPM3", 2, "^RESU"); acpigen_pop_len(); acpigen_emit_byte(RETURN_OP); acpigen_emit_namestring("^TPM3"); } /* * PPI 1.2: 2.1.6 Submit preferred user language [Windows optional] * * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 5 * Arg3 (Package): Empty package */ static void tpm_ppi_func6_cb(void *arg) { /* * Set preferred user language: deprecated and must return 3 aka * "not implemented". */ acpigen_write_return_byte(PPI6_RET_NOT_IMPLEMENTED); } /* * PPI 1.2: 2.1.7 Submit TPM Operation Request to Pre-OS Environment 2 * * Supported Revisions: 1, 2 * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 7 * Arg3 (Package): Integer * * Returns: Type: Integer * 0: Success * 1: Not implemented * 2: General Failure * 3: Blocked by current BIOS settings */ static void tpm_ppi_func7_cb(void *arg) { acpigen_write_to_integer(ARG1_OP, LOCAL0_OP); /* Local2 = ConvertAndVerify(Arg3) */ verify_supported_ppi(ARG3_OP); /* If (ObjectType(Arg3) == Buffer) */ acpigen_write_store(); acpigen_emit_byte(OBJ_TYPE_OP); acpigen_emit_byte(ARG3_OP); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 3); /* Enforce use of Revision 1 that doesn't take an optional argument. */ /* Local0 = One */ acpigen_write_store(); acpigen_emit_byte(ONE_OP); acpigen_emit_byte(LOCAL0_OP); acpigen_pop_len(); // FIXME: Only advertise supported functions /* Revision 1 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 1); /* ^CMDR = Local2 */ acpigen_write_store_op_to_namestr(LOCAL2_OP, "^CMDR"); /* ^OARG = Zero */ acpigen_write_store_op_to_namestr(ZERO_OP, "^OARG"); acpigen_write_return_byte(PPI7_RET_SUCCESS); acpigen_pop_len(); /* Revision 2 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 2); /* ^CMDR = Local2 */ acpigen_write_store_op_to_namestr(LOCAL2_OP, "^CMDR"); /* ^OARG = Arg3 [1] */ acpigen_get_package_op_element(ARG3_OP, 1, LOCAL3_OP); acpigen_write_store(); acpigen_emit_byte(LOCAL3_OP); acpigen_emit_namestring("^OARG"); acpigen_write_return_byte(PPI7_RET_SUCCESS); acpigen_pop_len(); acpigen_write_return_byte(PPI7_RET_GENERAL_FAILURE); } /* * PPI 1.2: 2.1.8 Get User Confirmation Status for Operation * * Returns if a command is supported and allowed by firmware * Supported Revisions: 1 * Arg1 (Integer): Revision * Arg2 (Integer): Function Index = 7 * Arg3 (Package): Integer * * Returns: Type: Integer * 0: Not implemented * 1: BIOS only * 2: Blocked for OS by BIOS settings * 3: Allowed and physical present user required * 4: Allowed and physical present user not required */ static void tpm_ppi_func8_cb(void *arg) { acpigen_write_to_integer(ARG1_OP, LOCAL0_OP); /* Revision 1 */ acpigen_write_if_lequal_op_int(LOCAL0_OP, 1); acpigen_get_package_op_element(ARG3_OP, 0, LOCAL2_OP); /* Check if it's a valid PPI function */ acpigen_write_store(); acpigen_emit_namestring("^FSUP"); acpigen_emit_byte(LOCAL2_OP); acpigen_emit_byte(CONFIG(TPM1) ? ONE_OP : ZERO_OP); acpigen_emit_byte(LOCAL1_OP); acpigen_write_if_lequal_op_int(LOCAL1_OP, 0); acpigen_write_return_byte(0); /* Not implemented */ acpigen_pop_len(); // FIXME: Only advertise supported functions if (CONFIG(TPM1)) { /* * Some functions do not require PP depending on configuration. * Those aren't listed here, so the 'required PP' is always set for those. */ static const u32 tpm1_funcs[] = { TPM_NOOP, TPM_SET_NOPPICLEAR_TRUE, TPM_SET_NOPPIMAINTAINANCE_TRUE, TPM_SET_NOPPIPROVISION_TRUE, }; for (size_t i = 0; i < ARRAY_SIZE(tpm1_funcs); i++) { acpigen_write_if_lequal_op_int(LOCAL2_OP, tpm1_funcs[i]); acpigen_write_return_integer(PPI8_RET_ALLOWED); acpigen_pop_len(); /* Pop : If */ } } else if (CONFIG(TPM2)) { /* * Some functions do not require PP depending on configuration. * Those aren't listed here, so the 'required PP' is always set for those. */ static const u32 tpm2_funcs[] = { TPM2_NOOP, TPM2_SET_PP_REQUIRED_FOR_CLEAR_TRUE, TPM2_SET_PP_REQUIRED_FOR_CHANGE_PCRS_TRUE, TPM2_SET_PP_REQUIRED_FOR_TURN_ON_TRUE, TPM2_SET_PP_REQUIRED_FOR_CHANGE_EPS_TRUE, TPM2_SET_PP_REQUIRED_FOR_TURN_OFF_TRUE, TPM2_SET_PP_REQUIRED_FOR_ENABLE_BLOCK_SID_TRUE, TPM2_SET_PP_REQUIRED_FOR_DISABLE_BLOCK_SID_TRUE, }; for (size_t i = 0; i < ARRAY_SIZE(tpm2_funcs); i++) { acpigen_write_if_lequal_op_int(LOCAL2_OP, tpm2_funcs[i]); acpigen_write_return_integer(PPI8_RET_ALLOWED); acpigen_pop_len(); /* Pop : If */ } } acpigen_write_return_integer(PPI8_RET_ALLOWED_WITH_PP); acpigen_pop_len(); acpigen_write_return_integer(PPI8_RET_NOT_IMPLEMENTED); } static void (*tpm_ppi_callbacks[])(void *) = { tpm_ppi_func0_cb, tpm_ppi_func1_cb, tpm_ppi_func2_cb, tpm_ppi_func3_cb, tpm_ppi_func4_cb, tpm_ppi_func5_cb, tpm_ppi_func6_cb, tpm_ppi_func7_cb, tpm_ppi_func8_cb, }; static void tpm_mci_func0_cb(void *arg) { /* Function 1. */ acpigen_write_return_singleton_buffer(0x3); } static void tpm_mci_func1_cb(void *arg) { /* Just return success. */ acpigen_write_return_byte(0); } static void (*tpm_mci_callbacks[])(void *) = { tpm_mci_func0_cb, tpm_mci_func1_cb, }; void tpm_ppi_acpi_fill_ssdt(const struct device *dev) { struct cb_tpm_ppi_payload_handshake *ppib; static const struct fieldlist list[] = { FIELDLIST_OFFSET(0x100),// FIXME: Add support for func FIELDLIST_NAMESTR("PPIN", 8),// Not used FIELDLIST_NAMESTR("PPIP", 32),// Not used FIELDLIST_NAMESTR("RESU", 32),// Result of the last operation (TPM error code) FIELDLIST_NAMESTR("CMDR", 32),// The command requested by OS. 0 for NOP FIELDLIST_NAMESTR("OARG", 32),// The command optional argument requested by OS FIELDLIST_NAMESTR("LCMD", 32),// The last command requested by OS. FIELDLIST_NAMESTR("FRET", 32),// Not used }; static const u8 tpm1_funcs[] = { TPM_NOOP, TPM_ENABLE, TPM_DISABLE, TPM_ACTIVATE, TPM_DEACTIVATE, TPM_CLEAR, TPM_ENABLE_ACTIVATE, TPM_DEACTIVATE_DISABLE, TPM_SETOWNERINSTALL_TRUE, TPM_SETOWNERINSTALL_FALSE, TPM_ENABLE_ACTIVATE_SETOWNERINSTALL_TRUE, TPM_SETOWNERINSTALL_FALSE_DEACTIVATE_DISABLE, TPM_CLEAR_ENABLE_ACTIVATE, TPM_SET_NOPPIPROVISION_FALSE, TPM_SET_NOPPIPROVISION_TRUE, TPM_ENABLE_ACTIVE_CLEAR, TPM_ENABLE_ACTIVE_CLEAR_ENABLE_ACTIVE, }; static const u8 tpm2_funcs[] = { TPM2_NOOP, TPM2_ENABLE, TPM2_DISABLE, TPM2_CLEAR, TPM2_CLEAR_ENABLE_ACTIVE, TPM2_SET_PP_REQUIRED_FOR_CLEAR_TRUE, TPM2_SET_PP_REQUIRED_FOR_CLEAR_FALSE, TPM2_ENABLE_CLEAR, TPM2_ENABLE_CLEAR2, TPM2_SET_PCR_BANKS, TPM2_CHANGE_EPS, TPM2_SET_PP_REQUIRED_FOR_CHANGE_PCRS_FALSE, TPM2_SET_PP_REQUIRED_FOR_CHANGE_PCRS_TRUE, TPM2_SET_PP_REQUIRED_FOR_TURN_ON_FALSE, TPM2_SET_PP_REQUIRED_FOR_TURN_ON_TRUE, TPM2_SET_PP_REQUIRED_FOR_TURN_OFF_FALSE, TPM2_SET_PP_REQUIRED_FOR_TURN_OFF_TRUE, TPM2_SET_PP_REQUIRED_FOR_CHANGE_EPS_FALSE, TPM2_SET_PP_REQUIRED_FOR_CHANGE_EPS_TRUE, TPM2_LOG_ALL_DIGEST, TPM2_DISABLE_ENDORSMENT_ENABLE_STORAGE_HISTORY, TPM2_ENABLE_BLOCK_SID, TPM2_DISABLE_BLOCK_SID, TPM2_SET_PP_REQUIRED_FOR_ENABLE_BLOCK_SID_TRUE, TPM2_SET_PP_REQUIRED_FOR_ENABLE_BLOCK_SID_FALSE, TPM2_SET_PP_REQUIRED_FOR_DISABLE_BLOCK_SID_TRUE, TPM2_SET_PP_REQUIRED_FOR_DISABLE_BLOCK_SID_FALSE, }; /* * On hot reset/ACPI S3 the contents are preserved. */ ppib = (void *)cbmem_add(CBMEM_ID_TPM_PPI, sizeof(*ppib)); if (!ppib) { printk(BIOS_ERR, "PPI: Failed to add CBMEM\n"); return; } printk(BIOS_DEBUG, "PPI: Pending OS request: 0x%x (0x%x)\n", ppib->pprq, ppib->pprm); printk(BIOS_DEBUG, "PPI: OS response: CMD 0x%x = 0x%x\n", ppib->lppr, ppib->pprp); /* Clear unsupported fields */ ppib->next_step = 0; ppib->ppin = 1; // Not used by ACPI. Read by EDK-2, must be 1. ppib->ppip = 0; ppib->fret = 0; ppib->next_step = 0; bool found = false; /* Fill in defaults, the TPM command executor may overwrite this list */ memset(ppib->func, 0, sizeof(ppib->func)); if (CONFIG(TPM1)) { for (size_t i = 0; i < ARRAY_SIZE(tpm1_funcs); i++) { ppib->func[tpm1_funcs[i]] = 1; if (ppib->pprq == tpm1_funcs[i]) found = true; } } else { for (size_t i = 0; i < ARRAY_SIZE(tpm2_funcs); i++) { ppib->func[tpm2_funcs[i]] = 1; if (ppib->pprq == tpm2_funcs[i]) found = true; } } if (!found) { // Set sane defaults ppib->pprq = 0; ppib->pprm = 0; ppib->pprp = 0; } /* Physical Presence OpRegion */ struct opregion opreg = OPREGION("PPOP", SYSTEMMEMORY, (uintptr_t)ppib, sizeof(*ppib)); acpigen_write_opregion(&opreg); acpigen_write_field(opreg.name, list, ARRAY_SIZE(list), FIELD_ANYACC | FIELD_NOLOCK | FIELD_PRESERVE); acpigen_write_name("TPM2"); acpigen_write_package(2); acpigen_write_dword(0); acpigen_write_dword(0); acpigen_pop_len(); /* Package */ acpigen_write_name("TPM3"); acpigen_write_package(3); acpigen_write_dword(0); acpigen_write_dword(0); acpigen_write_dword(0); acpigen_pop_len(); /* Package */ /* * Returns One if the firmware implements this function. * * Arg0: Integer PPI function */ acpigen_write_method_serialized("FUNC", 1); acpigen_write_to_integer(ARG0_OP, LOCAL0_OP); acpigen_write_to_integer(ARG1_OP, LOCAL1_OP); acpigen_write_if(); acpigen_emit_byte(LGREATER_OP); acpigen_emit_byte(LOCAL0_OP); acpigen_write_integer(VENDOR_SPECIFIC_OFFSET); acpigen_write_return_integer(0); acpigen_pop_len(); /* If */ /* TPPF = CreateField("PPOP", Local0) */ acpigen_emit_byte(CREATE_BYTE_OP); acpigen_emit_namestring("PPOP"); acpigen_emit_byte(LOCAL0_OP); acpigen_emit_namestring("TPPF"); /* Local0 = ToInteger("TPPF") */ acpigen_emit_byte(TO_INTEGER_OP); acpigen_emit_namestring("TPPF"); acpigen_emit_byte(LOCAL0_OP); acpigen_write_return_op(LOCAL0_OP); acpigen_pop_len(); /* Method */ /* * Returns One if the PPI spec supports this functions. * That doesn't necessarily mean that the firmware implemtents it, or the * TPM can execute the function. * * Arg0: Integer PPI function * Arg1: Integer TPMversion (0: TPM2, 1: TPM1.2) */ acpigen_write_method("FSUP", 2); acpigen_write_to_integer(ARG0_OP, LOCAL0_OP); acpigen_write_to_integer(ARG1_OP, LOCAL1_OP); acpigen_write_if(); acpigen_emit_byte(LGREATER_OP); acpigen_emit_byte(LOCAL0_OP); acpigen_write_integer(VENDOR_SPECIFIC_OFFSET); acpigen_write_return_integer(0); acpigen_pop_len(); /* If */ acpigen_write_if_lequal_op_int(LOCAL1_OP, 1); for (size_t i = 0; i < ARRAY_SIZE(tpm1_funcs); i++) { acpigen_write_if_lequal_op_int(LOCAL0_OP, tpm1_funcs[i]); acpigen_write_return_integer(1); acpigen_pop_len(); /* Pop : If */ } acpigen_pop_len(); /* If */ acpigen_write_if_lequal_op_int(LOCAL1_OP, 0); for (size_t i = 0; i < ARRAY_SIZE(tpm2_funcs); i++) { acpigen_write_if_lequal_op_int(LOCAL0_OP, tpm2_funcs[i]); acpigen_write_return_integer(1); acpigen_pop_len(); /* Pop : If */ } acpigen_pop_len(); /* If */ acpigen_write_return_integer(0); acpigen_pop_len(); /* Method */ /* * _DSM method */ struct dsm_uuid ids[] = { /* Physical presence interface. * This is used to submit commands like "Clear TPM" to * be run at next reboot provided that user confirms * them. */ DSM_UUID(TPM_PPI_UUID, &tpm_ppi_callbacks[0], ARRAY_SIZE(tpm_ppi_callbacks), NULL), /* Memory clearing on boot: just a dummy. */ DSM_UUID(TPM_MCI_UUID, &tpm_mci_callbacks[0], ARRAY_SIZE(tpm_mci_callbacks), NULL), }; acpigen_write_dsm_uuid_arr(ids, ARRAY_SIZE(ids)); } void lb_tpm_ppi(struct lb_header *header) { struct lb_tpm_physical_presence *tpm_ppi; void *ppib; ppib = cbmem_find(CBMEM_ID_TPM_PPI); if (!ppib) return; tpm_ppi = (struct lb_tpm_physical_presence *)lb_new_record(header); tpm_ppi->tag = LB_TAG_TPM_PPI_HANDOFF; tpm_ppi->size = sizeof(*tpm_ppi); tpm_ppi->ppi_address = (uintptr_t)ppib; tpm_ppi->tpm_version = CONFIG(TPM1) ? LB_TPM_VERSION_TPM_VERSION_1_2 : LB_TPM_VERSION_TPM_VERSION_2; tpm_ppi->ppi_version = BCD(1, 3); }