util/mma/mma_get_result.sh

   1 #!/usr/bin/env bash
   2 #
   3 # SPDX-License-Identifier: GPL-2.0-only
   4
   5 mma_results_op_bin="${1}"
   6 mma_results_op_bin_tmp="${mma_results_op_bin}".tmp
   7 mma_cbmem_id="0x4d4d4144"
   8
   9 show_usage() {
  10         printf "usage: $(basename "${0}") <output_results.bin>\n"
  11         printf "pass path of a bin file where you want to save results.\n"
  12 }
  13
  14 #
  15 # main entry point
  16 #
  17
  18 main() {
  19         if [ ! "${mma_results_op_bin}" ];then
  20                 show_usage
  21                 exit -1
  22         fi
  23
  24         printf "Reading cbmem ...\n"
  25         cbmem -r ${mma_cbmem_id} > "${mma_results_op_bin_tmp}" || \
  26                 {
  27                         printf "error in executing cbmem utility\n" ;
  28                         exit -1;
  29                 }
  30
  31         #format of o/p is :
  32         # <mma_signature><mma_test_header+data>
  33         #
  34         # where,
  35         # <mma_signature> is 32bit length string "MMAD"
  36         #
  37         # <mma_test_header+data>  is the FULL HOB which coreboot
  38         #                         receives from FSP
  39         # <mma_test_header> is 22 bytes long at the start of the HOB.
  40         #                   MMA data starts right after 26 bytes
  41         #                   26 bytes = (4 bytes of "MMAD"
  42         #                               + 22 bytes of mma_test_header)
  43         #
  44
  45         mma_signature=$(dd if="${mma_results_op_bin_tmp}" bs=1 count=4 )
  46
  47         if [[ ${mma_signature} != "MMAD" ]];then
  48                 printf "MMA signature mismatch" > "${mma_results_op_bin}"
  49                 rm -r "${mma_results_op_bin_tmp}"
  50                 cbmem -l >> "${mma_results_op_bin}"
  51                 printf "MMA signature mismatch\n"
  52                 exit -1
  53         fi
  54
  55         dd if="${mma_results_op_bin_tmp}" of="${mma_results_op_bin}" bs=1 skip=26 || \
  56                 {
  57                         printf "error in generating "${mma_results_op_bin}"\n" ;
  58                         exit -1;
  59                 }
  60         rm -r "${mma_results_op_bin_tmp}"
  61         printf "MMA data saved to "${mma_results_op_bin}"\n"
  62 }
  63
  64 main "$@"