diff options
| -rw-r--r-- | common/Makefile | 1 | ||||
| -rw-r--r-- | common/cmd_tpm.c | 103 |
2 files changed, 104 insertions, 0 deletions
diff --git a/common/Makefile b/common/Makefile index 1b672ad..1be7236 100644 --- a/common/Makefile +++ b/common/Makefile @@ -152,6 +152,7 @@ COBJS-$(CONFIG_CMD_STRINGS) += cmd_strings.o COBJS-$(CONFIG_CMD_TERMINAL) += cmd_terminal.o COBJS-$(CONFIG_CMD_TIME) += cmd_time.o COBJS-$(CONFIG_SYS_HUSH_PARSER) += cmd_test.o +COBJS-$(CONFIG_CMD_TPM) += cmd_tpm.o COBJS-$(CONFIG_CMD_TSI148) += cmd_tsi148.o COBJS-$(CONFIG_CMD_UBI) += cmd_ubi.o COBJS-$(CONFIG_CMD_UBIFS) += cmd_ubifs.o diff --git a/common/cmd_tpm.c b/common/cmd_tpm.c new file mode 100644 index 0000000..6f5cd48 --- /dev/null +++ b/common/cmd_tpm.c @@ -0,0 +1,103 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> +#include <tpm.h> + +#define MAX_TRANSACTION_SIZE 30 + +/* + * tpm_write() expects a variable number of parameters: the internal address + * followed by data to write, byte by byte. + * + * Returns 0 on success or -1 on errors (wrong arguments or TPM failure). + */ +static int tpm_process(int argc, char * const argv[], cmd_tbl_t *cmdtp) +{ + u8 tpm_buffer[MAX_TRANSACTION_SIZE]; + u32 write_size, read_size; + char *p; + int rv = -1; + + for (write_size = 0; write_size < argc; write_size++) { + u32 datum = simple_strtoul(argv[write_size], &p, 0); + if (*p || (datum > 0xff)) { + printf("\n%s: bad data value\n\n", argv[write_size]); + cmd_usage(cmdtp); + return rv; + } + tpm_buffer[write_size] = (u8)datum; + } + + read_size = sizeof(tpm_buffer); + if (!tis_sendrecv(tpm_buffer, write_size, tpm_buffer, &read_size)) { + int i; + puts("Got TPM response:\n"); + for (i = 0; i < read_size; i++) + printf(" %2.2x", tpm_buffer[i]); + puts("\n"); + rv = 0; + } else { + puts("tpm command failed\n"); + } + return rv; +} + +static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int rv = 0; + + /* + * Verify that in case it is present, the first argument, it is + * exactly one character in size. + */ + if (argc < 7) { + puts("command should be at least six bytes in size\n"); + return -1; + } + + if (tis_init()) { + puts("tis_init() failed!\n"); + return -1; + } + + if (tis_open()) { + puts("tis_open() failed!\n"); + return -1; + } + + rv = tpm_process(argc - 1, argv + 1, cmdtp); + + if (tis_close()) { + puts("tis_close() failed!\n"); + rv = -1; + } + + return rv; +} + +U_BOOT_CMD(tpm, MAX_TRANSACTION_SIZE, 1, do_tpm, + "<byte> [<byte> ...] - write data and read response", + "send arbitrary data (at least 6 bytes) to the TPM " + "device and read the response" +); |