104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <tpm.h>
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#define MAX_TRANSACTION_SIZE 30
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/*
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* tpm_write() expects a variable number of parameters: the internal address
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* followed by data to write, byte by byte.
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*
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* Returns 0 on success or -1 on errors (wrong arguments or TPM failure).
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*/
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static int tpm_process(int argc, char * const argv[], cmd_tbl_t *cmdtp)
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{
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u8 tpm_buffer[MAX_TRANSACTION_SIZE];
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u32 write_size, read_size;
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char *p;
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int rv = -1;
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for (write_size = 0; write_size < argc; write_size++) {
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u32 datum = simple_strtoul(argv[write_size], &p, 0);
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if (*p || (datum > 0xff)) {
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printf("\n%s: bad data value\n\n", argv[write_size]);
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cmd_usage(cmdtp);
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return rv;
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}
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tpm_buffer[write_size] = (u8)datum;
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}
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read_size = sizeof(tpm_buffer);
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if (!tis_sendrecv(tpm_buffer, write_size, tpm_buffer, &read_size)) {
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int i;
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puts("Got TPM response:\n");
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for (i = 0; i < read_size; i++)
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printf(" %2.2x", tpm_buffer[i]);
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puts("\n");
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rv = 0;
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} else {
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puts("tpm command failed\n");
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}
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return rv;
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}
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static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int rv = 0;
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/*
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* Verify that in case it is present, the first argument, it is
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* exactly one character in size.
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*/
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if (argc < 7) {
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puts("command should be at least six bytes in size\n");
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return -1;
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}
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if (tis_init()) {
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puts("tis_init() failed!\n");
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return -1;
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}
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if (tis_open()) {
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puts("tis_open() failed!\n");
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return -1;
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}
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rv = tpm_process(argc - 1, argv + 1, cmdtp);
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if (tis_close()) {
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puts("tis_close() failed!\n");
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rv = -1;
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}
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return rv;
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}
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U_BOOT_CMD(tpm, MAX_TRANSACTION_SIZE, 1, do_tpm,
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"<byte> [<byte> ...] - write data and read response",
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"send arbitrary data (at least 6 bytes) to the TPM "
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"device and read the response"
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);
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