| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <types.h> |
| #include <console/cbmem_console.h> |
| #include <console/console.h> |
| #include <arch/acpi.h> |
| #include <tpm.h> |
| #include <reset.h> |
| |
| //#define EXTRA_LOGGING |
| |
| #define TPM_LARGE_ENOUGH_COMMAND_SIZE 256 /* saves space in the firmware */ |
| |
| #define TPM_SUCCESS ((u32)0x00000000) |
| |
| #define TPM_E_IOERROR ((u32)0x0000001f) |
| #define TPM_E_COMMUNICATION_ERROR ((u32)0x00005004) |
| #define TPM_E_NON_FATAL ((u32)0x00000800) |
| #define TPM_E_INVALID_POSTINIT ((u32)0x00000026) |
| |
| #define TPM_E_NEEDS_SELFTEST ((u32)(TPM_E_NON_FATAL + 1)) |
| #define TPM_E_DOING_SELFTEST ((u32)(TPM_E_NON_FATAL + 2)) |
| |
| static const struct { |
| u8 buffer[12]; |
| } tpm_resume_cmd = { |
| { 0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x2 } |
| }; |
| |
| static const struct { |
| u8 buffer[12]; |
| } tpm_startup_cmd = { |
| {0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x1 } |
| }; |
| |
| static const struct { |
| u8 buffer[12]; |
| } tpm_deactivate_cmd = { |
| {0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x3 } |
| }; |
| |
| static const struct { |
| u8 buffer[10]; |
| } tpm_continueselftest_cmd = { |
| { 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x53 } |
| }; |
| |
| static inline void FromTpmUint32(const u8 * buffer, u32 * x) |
| { |
| *x = ((buffer[0] << 24) | |
| (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]); |
| } |
| |
| static inline int TpmCommandSize(const u8 * buffer) |
| { |
| u32 size; |
| FromTpmUint32(buffer + sizeof(u16), &size); |
| return (int)size; |
| } |
| |
| /* Gets the code field of a TPM command. */ |
| static inline int TpmCommandCode(const u8 * buffer) |
| { |
| u32 code; |
| FromTpmUint32(buffer + sizeof(u16) + sizeof(u32), &code); |
| return code; |
| } |
| |
| /* Gets the return code field of a TPM result. */ |
| static inline int TpmReturnCode(const u8 * buffer) |
| { |
| return TpmCommandCode(buffer); |
| } |
| |
| /* Like TlclSendReceive below, but do not retry if NEEDS_SELFTEST or |
| * DOING_SELFTEST errors are returned. |
| */ |
| static u32 TlclSendReceiveNoRetry(const u8 * request, |
| u8 * response, int max_length) |
| { |
| size_t response_length = max_length; |
| u32 result; |
| |
| #ifdef EXTRA_LOGGING |
| printk(BIOS_DEBUG, "TPM: command: %x%x %x%x%x%x %x%x%x%x\n", |
| request[0], request[1], |
| request[2], request[3], request[4], request[5], |
| request[6], request[7], request[8], request[9]); |
| #endif |
| |
| result = TPM_SUCCESS; |
| if (tis_sendrecv |
| (request, TpmCommandSize(request), response, &response_length)) |
| result = TPM_E_IOERROR; |
| |
| if (0 != result) { |
| /* Communication with TPM failed, so response is garbage */ |
| printk(BIOS_DEBUG, |
| "TPM: command 0x%x send/receive failed: 0x%x\n", |
| TpmCommandCode(request), result); |
| return TPM_E_COMMUNICATION_ERROR; |
| } |
| /* Otherwise, use the result code from the response */ |
| result = TpmReturnCode(response); |
| |
| /* TODO: add paranoia about returned response_length vs. max_length |
| * (and possibly expected length from the response header). See |
| * crosbug.com/17017 */ |
| |
| #ifdef EXTRA_LOGGING |
| printk(BIOS_DEBUG, "TPM: response: %x%x %x%x%x%x %x%x%x%x\n", |
| response[0], response[1], |
| response[2], response[3], response[4], response[5], |
| response[6], response[7], response[8], response[9]); |
| #endif |
| |
| printk(BIOS_DEBUG, "TPM: command 0x%x returned 0x%x\n", |
| TpmCommandCode(request), result); |
| |
| return result; |
| } |
| |
| static inline u32 TlclContinueSelfTest(void) |
| { |
| u8 response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| printk(BIOS_DEBUG, "TPM: Continue self test\n"); |
| /* Call the No Retry version of SendReceive to avoid recursion. */ |
| return TlclSendReceiveNoRetry(tpm_continueselftest_cmd.buffer, |
| response, sizeof(response)); |
| } |
| |
| /* Sends a TPM command and gets a response. Returns 0 if success or the TPM |
| * error code if error. In the firmware, waits for the self test to complete |
| * if needed. In the host, reports the first error without retries. */ |
| static u32 TlclSendReceive(const u8 * request, u8 * response, int max_length) |
| { |
| u32 result = TlclSendReceiveNoRetry(request, response, max_length); |
| /* When compiling for the firmware, hide command failures due to the self |
| * test not having run or completed. */ |
| /* If the command fails because the self test has not completed, try it |
| * again after attempting to ensure that the self test has completed. */ |
| if (result == TPM_E_NEEDS_SELFTEST || result == TPM_E_DOING_SELFTEST) { |
| result = TlclContinueSelfTest(); |
| if (result != TPM_SUCCESS) { |
| return result; |
| } |
| #if defined(TPM_BLOCKING_CONTINUESELFTEST) || defined(VB_RECOVERY_MODE) |
| /* Retry only once */ |
| result = TlclSendReceiveNoRetry(request, response, max_length); |
| #else |
| /* This needs serious testing. The TPM specification says: |
| * "iii. The caller MUST wait for the actions of |
| * TPM_ContinueSelfTest to complete before reissuing the |
| * command C1." But, if ContinueSelfTest is non-blocking, how |
| * do we know that the actions have completed other than trying |
| * again? */ |
| do { |
| result = |
| TlclSendReceiveNoRetry(request, response, |
| max_length); |
| } while (result == TPM_E_DOING_SELFTEST); |
| #endif |
| } |
| |
| return result; |
| } |
| |
| void init_tpm(int s3resume) |
| { |
| u32 result; |
| u8 response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| |
| if (CONFIG_TPM_DEACTIVATE) { |
| printk(BIOS_SPEW, "TPM: Deactivate\n"); |
| result = TlclSendReceive(tpm_deactivate_cmd.buffer, |
| response, sizeof(response)); |
| if (result == TPM_SUCCESS) { |
| printk(BIOS_SPEW, "TPM: OK.\n"); |
| return; |
| } |
| |
| printk(BIOS_ERR, "TPM: Error code 0x%x.\n", result); |
| return; |
| } |
| |
| /* Doing TPM startup when we're not coming in on the S3 resume path |
| * saves us roughly 20ms in boot time only. This does not seem to |
| * be worth an API change to vboot_reference-firmware right now, so |
| * let's keep the code around, but just bail out early: |
| */ |
| if (s3resume ? CONFIG_NO_TPM_RESUME |
| : CONFIG_SKIP_TPM_STARTUP_ON_NORMAL_BOOT) |
| return; |
| |
| printk(BIOS_DEBUG, "TPM initialization.\n"); |
| |
| printk(BIOS_SPEW, "TPM: Init\n"); |
| if (tis_init()) |
| return; |
| |
| printk(BIOS_SPEW, "TPM: Open\n"); |
| if (tis_open()) |
| return; |
| |
| |
| if (s3resume) { |
| /* S3 Resume */ |
| printk(BIOS_SPEW, "TPM: Resume\n"); |
| result = TlclSendReceive(tpm_resume_cmd.buffer, |
| response, sizeof(response)); |
| if (result == TPM_E_INVALID_POSTINIT) { |
| /* We're on a platform where the TPM maintains power |
| * in S3, so it's already initialized. |
| */ |
| printk(BIOS_DEBUG, "TPM: Already initialized.\n"); |
| return; |
| } |
| } else { |
| printk(BIOS_SPEW, "TPM: Startup\n"); |
| result = TlclSendReceive(tpm_startup_cmd.buffer, |
| response, sizeof(response)); |
| } |
| |
| if (result == TPM_SUCCESS) { |
| printk(BIOS_SPEW, "TPM: OK.\n"); |
| return; |
| } |
| |
| printk(BIOS_ERR, "TPM: Error code 0x%x.\n", result); |
| |
| if (CONFIG_TPM_INIT_FAILURE_IS_FATAL) { |
| printk(BIOS_ERR, "Hard reset!\n"); |
| post_code(POST_TPM_FAILURE); |
| if (IS_ENABLED(CONFIG_CONSOLE_CBMEM_DUMP_TO_UART)) |
| cbmem_dump_console(); |
| hard_reset(); |
| } |
| } |