Make TPM datagrams const, since they cannot be modified in the RO firmware.

utility/tlcl_generator.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* This program generates partially filled TPM datagrams and other compile-time
  * constants (e.g. structure sizes and offsets).  Compile this file---and ONLY
  * this file---with -fpack-struct.  We take advantage of the fact that the
  * (packed) TPM structures layout (mostly) match the TPM request and response
  * datagram layout.  When they don't completely match, some fixing is necessary
@@ skipping 413 matching lines @@
     }
   }
 }
 
 /* Outputs the structure initializers for all commands.
  */
 void OutputCommands(Command* cmd) {
   if (cmd == NULL) {
     return;
   } else {
-    printf("struct s_%s{\n  uint8_t buffer[%d];\n",
+    printf("const struct s_%s{\n  uint8_t buffer[%d];\n",
            cmd->name, cmd->size == 0 ? cmd->max_size : cmd->size);
     OutputFields(cmd->fields);
     printf("} %s = {{", cmd->name);
     OutputBytes(cmd);
     printf("},\n");
     OutputFieldPointers(cmd, cmd->fields);
     printf("};\n\n");
   }
   OutputCommands(cmd->next);
 }
@@ skipping 51 matching lines @@
   OutputCommands(commands);
   printf("const int kWriteInfoLength = %d;\n", (int) sizeof(TPM_WRITE_INFO));
   printf("const int kNvDataPublicPermissionsOffset = %d;\n",
          (int) (offsetof(TPM_NV_DATA_PUBLIC, permission) +
                 2 * PCR_SELECTION_FIX +
                 offsetof(TPM_NV_ATTRIBUTES, attributes)));
 
   FreeCommands(commands);
   return 0;
 }