LXR uboot/common/cmd

   1/*
   2 * Copyright (c) 2011 The Chromium OS Authors.
   3 *
   4 * See file CREDITS for list of people who contributed to this
   5 * project.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation; either version 2 of
  10 * the License, or (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20 * MA 02111-1307 USA
  21 */
  22
  23#include <common.h>
  24#include <command.h>
  25#include <tpm.h>
  26
  27#define MAX_TRANSACTION_SIZE 30
  28
  29/*
  30 * tpm_write() expects a variable number of parameters: the internal address
  31 * followed by data to write, byte by byte.
  32 *
  33 * Returns 0 on success or -1 on errors (wrong arguments or TPM failure).
  34 */
  35static int tpm_process(int argc, char * const argv[], cmd_tbl_t *cmdtp)
  36{
  37        u8 tpm_buffer[MAX_TRANSACTION_SIZE];
  38        u32 write_size, read_size;
  39        char *p;
  40        int rv = -1;
  41
  42        for (write_size = 0; write_size < argc; write_size++) {
  43                u32 datum = simple_strtoul(argv[write_size], &p, 0);
  44                if (*p || (datum > 0xff)) {
  45                        printf("\n%s: bad data value\n\n", argv[write_size]);
  46                        cmd_usage(cmdtp);
  47                        return rv;
  48                }
  49                tpm_buffer[write_size] = (u8)datum;
  50        }
  51
  52        read_size = sizeof(tpm_buffer);
  53        if (!tis_sendrecv(tpm_buffer, write_size, tpm_buffer, &read_size)) {
  54                int i;
  55                puts("Got TPM response:\n");
  56                for (i = 0; i < read_size; i++)
  57                        printf(" %2.2x", tpm_buffer[i]);
  58                puts("\n");
  59                rv = 0;
  60        } else {
  61                puts("tpm command failed\n");
  62        }
  63        return rv;
  64}
  65
  66static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  67{
  68        int rv = 0;
  69
  70        /*
  71         * Verify that in case it is present, the first argument, it is
  72         * exactly one character in size.
  73         */
  74        if (argc < 7) {
  75                puts("command should be at least six bytes in size\n");
  76                return -1;
  77        }
  78
  79        if (tis_init()) {
  80                puts("tis_init() failed!\n");
  81                return -1;
  82        }
  83
  84        if (tis_open()) {
  85                puts("tis_open() failed!\n");
  86                return -1;
  87        }
  88
  89        rv = tpm_process(argc - 1, argv + 1, cmdtp);
  90
  91        if (tis_close()) {
  92                puts("tis_close() failed!\n");
  93                rv = -1;
  94        }
  95
  96        return rv;
  97}
  98
  99U_BOOT_CMD(tpm, MAX_TRANSACTION_SIZE, 1, do_tpm,
 100           "<byte> [<byte> ...]   - write data and read response",
 101           "send arbitrary data (at least 6 bytes) to the TPM "
 102           "device and read the response"
 103);
 104