nvramtool.c

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/*****************************************************************************\
 * nvramtool.c
 *****************************************************************************
 *  Copyright (C) 2002-2005 The Regents of the University of California.
 *  Produced at the Lawrence Livermore National Laboratory.
 *  Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
 *  UCRL-CODE-2003-012
 *  All rights reserved.
 *
 *  This file is part of nvramtool, a utility for reading/writing coreboot
 *  parameters and displaying information from the coreboot table.
 *  For details, see http://coreboot.org/nvramtool.
 *
 *  Please also read the file DISCLAIMER which is included in this software
 *  distribution.
 *
 *  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) version 2, dated June 1991.
 *
 *  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 terms and
 *  conditions of 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 "opts.h"
#include "lbtable.h"
#include "layout.h"
#include "layout_file.h"
#include "input_file.h"
#include "cmos_ops.h"
#include "cmos_lowlevel.h"
#include "reg_expr.h"
#include "hexdump.h"

typedef void (*op_fn_t) (void);

static void op_show_version (void);
static void op_show_usage (void);
static void op_lbtable_show_info (void);
static void op_lbtable_dump (void);
static void op_show_param_values (void);
static void op_cmos_show_one_param (void);
static void op_cmos_show_all_params (void);
static void op_cmos_set_one_param (void);
static void op_cmos_set_params_stdin (void);
static void op_cmos_set_params_file (void);
static void op_cmos_checksum (void);
static void op_show_layout (void);
static void op_write_cmos_dump (void);
static void op_read_cmos_dump (void);
static void op_show_cmos_hex_dump (void);
static void op_show_cmos_dumpfile (void);
static int list_one_param (const char name[], int show_name);
static int list_all_params (void);
static void list_param_enums (const char name[]);
static void set_one_param (const char name[], const char value[]);
static void set_params (FILE *f);
static void parse_assignment (char arg[], const char **name,
                              const char **value);
static int list_cmos_entry (const cmos_entry_t *e, int show_name);
static uint16_t convert_checksum_value (const char value[]);

static const op_fn_t op_fns[] =
 { op_show_version,
   op_show_usage,
   op_lbtable_show_info,
   op_lbtable_dump,
   op_show_param_values,
   op_cmos_show_one_param,
   op_cmos_show_all_params,
   op_cmos_set_one_param,
   op_cmos_set_params_stdin,
   op_cmos_set_params_file,
   op_cmos_checksum,
   op_show_layout,
   op_write_cmos_dump,
   op_read_cmos_dump,
   op_show_cmos_hex_dump,
   op_show_cmos_dumpfile
 };

static const hexdump_format_t cmos_dump_format =
 { 16, 2, "", " | ", " ", " | ", '.', NULL };

/****************************************************************************
 * main
 ****************************************************************************/
int main (int argc, char *argv[])
 { cmos_layout_get_fn_t fn;

   parse_nvramtool_args(argc, argv);

   if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].found)
    { set_layout_filename(
            nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].param);
      fn = get_layout_from_file;
    }
   else
      fn = get_layout_from_cmos_table;

   register_cmos_layout_get_fn(fn);
   op_fns[nvramtool_op.op]();
   return 0;
 }

/****************************************************************************
 * op_show_version
 *
 * -v
 *
 * Show version information for this program.
 ****************************************************************************/
static void op_show_version (void)
 { printf("This is %s version %s.\n", prog_name, prog_version); }

/****************************************************************************
 * op_show_usage
 *
 * -h
 *
 * Show a usage message for this program.
 ****************************************************************************/
static void op_show_usage (void)
 { usage(stdout); }

/****************************************************************************
 * op_lbtable_show_info
 *
 * -l [ARG]
 *
 * If ARG is present, show coreboot table information specified by ARG.
 * Else show all possible values for ARG.
 ****************************************************************************/
static void op_lbtable_show_info (void)
 { if (nvramtool_op.param == NULL)
      list_lbtable_choices();
   else
    { get_lbtable();
      list_lbtable_item(nvramtool_op.param);
    }
 }

/****************************************************************************
 * op_lbtable_dump
 *
 * -d
 *
 * Do low-level dump of coreboot table.
 ****************************************************************************/
static void op_lbtable_dump (void)
 { get_lbtable();
   dump_lbtable();
 }

/****************************************************************************
 * op_show_param_values
 *
 * -e NAME option
 *
 * Show all possible values for parameter NAME.
 ****************************************************************************/
static void op_show_param_values (void)
 { get_cmos_layout();
   list_param_enums(nvramtool_op.param);
 }

/****************************************************************************
 * op_cmos_show_one_param
 *
 * [-n] -r NAME
 *
 * Show parameter NAME.  If -n is specified, show value only.  Else show name
 * and value.
 ****************************************************************************/
static void op_cmos_show_one_param (void)
 { int result;

   get_cmos_layout();
   result = list_one_param(nvramtool_op.param,
                  !nvramtool_op_modifiers[NVRAMTOOL_MOD_SHOW_VALUE_ONLY].found);
   cmos_checksum_verify();

   if (result)
      exit(1);
 }

/****************************************************************************
 * op_cmos_show_all_params
 *
 * -a
 *
 * Show names and values for all parameters.
 ****************************************************************************/
static void op_cmos_show_all_params (void)
 { int result;

   get_cmos_layout();
   result = list_all_params();
   cmos_checksum_verify();

   if (result)
      exit(1);
 }

/****************************************************************************
 * op_cmos_set_one_param
 *
 * -w NAME=VALUE
 *
 * Set parameter NAME to VALUE.
 ****************************************************************************/
static void op_cmos_set_one_param (void)
 { const char *name, *value;

   get_cmos_layout();

   /* Separate 'NAME=VALUE' syntax into two strings representing NAME and
    * VALUE.
    */
   parse_assignment(nvramtool_op.param, &name, &value);

   set_one_param(name, value);
 }

/****************************************************************************
 * op_cmos_set_params_stdin
 *
 * -i
 *
 * Set parameters according to standard input.
 ****************************************************************************/
static void op_cmos_set_params_stdin (void)
 { get_cmos_layout();
   set_params(stdin);
 }

/****************************************************************************
 * op_cmos_set_params_file
 *
 * -p INPUT_FILE
 *
 * Set parameters according to INPUT_FILE.
 ****************************************************************************/
static void op_cmos_set_params_file (void)
 { FILE *f;

   if ((f = fopen(nvramtool_op.param, "r")) == NULL)
    { fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
              prog_name, nvramtool_op.param, strerror(errno));
      exit(1);
    }

   get_cmos_layout();
   set_params(f);
   fclose(f);
 }

/****************************************************************************
 * op_cmos_checksum
 *
 * -c [VALUE]
 *
 * If VALUE is present, set coreboot CMOS checksum to VALUE.  Else show
 * checksum value.
 ****************************************************************************/
static void op_cmos_checksum (void)
 { uint16_t checksum;

   get_cmos_layout();

   if (nvramtool_op.param == NULL)
    { set_iopl(3);
      checksum = cmos_checksum_read();
      set_iopl(0);
      printf("0x%x\n", checksum);
    }
   else
    { checksum = convert_checksum_value(nvramtool_op.param);
      set_iopl(3);
      cmos_checksum_write(checksum);
      set_iopl(0);
    }
 }

/****************************************************************************
 * op_show_layout
 *
 * -Y
 *
 * Write CMOS layout information to standard output.
 ****************************************************************************/
static void op_show_layout (void)
 { get_cmos_layout();
   write_cmos_layout(stdout);
 }

/****************************************************************************
 * op_write_cmos_dump
 *
 * -b OUTPUT_FILE
 *
 * Write the contents of CMOS memory to a binary file.
 ****************************************************************************/
static void op_write_cmos_dump (void)
 { unsigned char data[CMOS_SIZE];
   FILE *f;

   if ((f = fopen(nvramtool_op.param, "w")) == NULL)
    { fprintf(stderr, "%s: Can not open file %s for writing: %s\n",
              prog_name, nvramtool_op.param, strerror(errno));
      exit(1);
    }

   set_iopl(3);
   cmos_read_all(data);
   set_iopl(0);

   if (fwrite(data, 1, CMOS_SIZE, f) != CMOS_SIZE)
    { fprintf(stderr, "%s: Error writing CMOS data to file %s: %s\n",
              prog_name, nvramtool_op.param, strerror(errno));
      exit(1);
    }

   fclose(f);
 }

/****************************************************************************
 * op_read_cmos_dump
 *
 * -B INPUT_FILE
 *
 * Read binary data from a file and write the data to CMOS memory.
 ****************************************************************************/
static void op_read_cmos_dump (void)
 { unsigned char data[CMOS_SIZE];
   size_t nr_bytes;
   FILE *f;

   if ((f = fopen(nvramtool_op.param, "r")) == NULL)
    { fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
              prog_name, nvramtool_op.param, strerror(errno));
      exit(1);
    }

   if ((nr_bytes = fread(data, 1, CMOS_SIZE, f)) != CMOS_SIZE)
    { fprintf(stderr, "%s: Error: Only able to read %d bytes of CMOS data "
              "from file %s.  CMOS data is unchanged.\n", prog_name,
              (int) nr_bytes, nvramtool_op.param);
      exit(1);
    }

   fclose(f);
   set_iopl(3);
   cmos_write_all(data);
   set_iopl(0);
 }

/****************************************************************************
 * op_show_cmos_hex_dump
 *
 * -x
 *
 * Write a hex dump of CMOS memory to standard output.
 ****************************************************************************/
static void op_show_cmos_hex_dump (void)
 { unsigned char data[CMOS_SIZE];

   set_iopl(3);
   cmos_read_all(data);
   set_iopl(0);
   hexdump(data, CMOS_SIZE, 0, stdout, &cmos_dump_format);
 }

/****************************************************************************
 * op_show_cmos_dumpfile
 *
 * -X DUMP_FILE
 *
 * Read binary data from a file (presumably a CMOS dump file) and display a
 * hex dump of the CMOS data from the file.
 ****************************************************************************/
static void op_show_cmos_dumpfile (void)
 { unsigned char data[CMOS_SIZE];
   size_t nr_bytes;
   FILE *f;

   if ((f = fopen(nvramtool_op.param, "r")) == NULL)
    { fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
              prog_name, nvramtool_op.param, strerror(errno));
      exit(1);
    }

   nr_bytes = fread(data, 1, CMOS_SIZE, f);
   fclose(f);
   hexdump(data, nr_bytes, 0, stdout, &cmos_dump_format);
 }

/****************************************************************************
 * list_one_param
 *
 * Attempt to list one CMOS parameter given by 'name'.  'show_name' is a
 * boolean value indicating whether the parameter name should be displayed
 * along with its value.  Return 1 if error was encountered.  Else return OK.
 ****************************************************************************/
static int list_one_param (const char name[], int show_name)
 { const cmos_entry_t *e;

   if (is_checksum_name(name) || ((e = find_cmos_entry(name)) == NULL))
    { fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name, name);
      exit(1);
    }

   if (e->config == CMOS_ENTRY_RESERVED)
    { fprintf(stderr, "%s: Parameter %s is reserved.\n", prog_name, name);
      exit(1);
    }

   return (list_cmos_entry(e, show_name) != 0);
 }

/****************************************************************************
 * list_all_params
 *
 * Attempt to list all CMOS parameters.  Return 1 if error was encountered.
 * Else return OK.
 ****************************************************************************/
static int list_all_params (void)
 { const cmos_entry_t *e;
   int result;

   result = OK;

   for (e = first_cmos_entry(); e != NULL; e = next_cmos_entry(e))
    { if ((e->config == CMOS_ENTRY_RESERVED) || is_checksum_name(e->name))
         continue;

      if (list_cmos_entry(e, TRUE))
         result = 1;
    }

   return result;
 }

/****************************************************************************
 * list_param_enums
 *
 * List all possible values for CMOS parameter given by 'name'.
 ****************************************************************************/
static void list_param_enums (const char name[])
 { const cmos_entry_t *e;
   const cmos_enum_t *p;

   if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL)
    { fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name, name);
      exit(1);
    }

   switch (e->config)
    { case CMOS_ENTRY_ENUM:
         for (p = first_cmos_enum_id(e->config_id);
              p != NULL;
              p = next_cmos_enum_id(p))
            printf("%s\n", p->text);

         break;

      case CMOS_ENTRY_HEX:
         printf("Parameter %s requires a %u-bit unsigned integer.\n", name,
                e->length);
         break;

      case CMOS_ENTRY_STRING:
         printf("Parameter %s requires a %u-byte string.\n", name,
                e->length / 8);
         break;

      case CMOS_ENTRY_RESERVED:
         printf("Parameter %s is reserved.\n", name);
         break;

      default:
         BUG();
    }
 }

/****************************************************************************
 * set_one_param
 *
 * Set the CMOS parameter given by 'name' to 'value'.  The 'name' parameter
 * is case-sensitive.  If we are setting an enum parameter, then 'value' is
 * interpreted as a case-sensitive string that must match the option name
 * exactly.  If we are setting a 'hex' parameter, then 'value' is treated as
 * a string representation of an unsigned integer that may be specified in
 * decimal, hex, or octal.
 ****************************************************************************/
static void set_one_param (const char name[], const char value[])
 { const cmos_entry_t *e;
   unsigned long long n;

   if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL)
    { fprintf(stderr, "%s: CMOS parameter %s not found.", prog_name, name);
      exit(1);
    }

   switch (prepare_cmos_write(e, value, &n))
    { case OK:
         break;

      case CMOS_OP_BAD_ENUM_VALUE:
         fprintf(stderr, "%s: Bad value for parameter %s.", prog_name, name);
         goto fail;

      case CMOS_OP_NEGATIVE_INT:
         fprintf(stderr,
                 "%s: This program does not support assignment of negative "
                 "numbers to coreboot parameters.", prog_name);
         goto fail;

      case CMOS_OP_INVALID_INT:
         fprintf(stderr, "%s: %s is not a valid integer.", prog_name, value);
         goto fail;

      case CMOS_OP_RESERVED:
         fprintf(stderr,
                 "%s: Can not modify reserved coreboot parameter %s.",
                 prog_name, name);
         goto fail;

      case CMOS_OP_VALUE_TOO_WIDE:
         fprintf(stderr,
                 "%s: Can not write value %s to CMOS parameter %s that is "
                 "only %d bits wide.", prog_name, value, name, e->length);
         goto fail;

      case CMOS_OP_NO_MATCHING_ENUM:
         fprintf(stderr,
                 "%s: coreboot parameter %s has no matching enums.",
                 prog_name, name);
         goto fail;

      case CMOS_AREA_OUT_OF_RANGE:
         fprintf(stderr,
                 "%s: The CMOS area specified by the layout info for "
                 "coreboot parameter %s is out of range.", prog_name, name);
         goto fail;

      case CMOS_AREA_OVERLAPS_RTC:
         fprintf(stderr,
                 "%s: The CMOS area specified by the layout info for "
                 "coreboot parameter %s overlaps the realtime clock area.",
                 prog_name, name);
         goto fail;

      case CMOS_AREA_TOO_WIDE:
         fprintf(stderr,
                 "%s: The CMOS area specified by the layout info for "
                 "coreboot parameter %s is too wide.",
                 prog_name, name);
         goto fail;

      default:
         fprintf(stderr,
                 "%s: Unknown error encountered while attempting to modify "
                 "coreboot parameter %s.", prog_name, name);
         goto fail;
    }

   /* write the value to nonvolatile RAM */
   set_iopl(3);
   cmos_write(e, n);
   cmos_checksum_write(cmos_checksum_compute());
   set_iopl(0);
   return;

fail:
   fprintf(stderr, "  CMOS write not performed.\n");
   exit(1);
 }

/****************************************************************************
 * set_params
 *
 * Set coreboot parameters according to the contents of file 'f'.
 ****************************************************************************/
static void set_params (FILE *f)
 { /* First process the input file.  Then perform writes only if there were
    * no problems processing the input.  Either all values will be written
    * successfully or no values will be written.
    */
   do_cmos_writes(process_input_file(f));
 }

/****************************************************************************
 * parse_assignment
 *
 * Parse the string 'arg' (which supposedly represents an assignment) into a
 * NAME and a VALUE.  If 'arg' does not conform to the proper assignment
 * syntax, exit with a usage message.  Otherwise, on return, 'arg' is broken
 * into substrings representing NAME and VALUE, and *name and *value are set
 * to point to these two substrings.
 ****************************************************************************/
static void parse_assignment (char arg[], const char **name,
                              const char **value)
 { static const size_t N_MATCHES = 4;
   regmatch_t match[N_MATCHES];
   regex_t assignment;

   compile_reg_exprs(REG_EXTENDED | REG_NEWLINE, 1, assignment_regex,
                     &assignment);

   /* Does 'arg' conform to proper assignment syntax?  If not, exit with a
    * usage message.
    */
   if (regexec(&assignment, arg, N_MATCHES, match, 0))
      usage(stderr);

   /* Ok, we found a valid assignment.  Break it into two strings
    * representing NAME and VALUE.
    */
   arg[match[1].rm_eo] = '\0';
   arg[match[2].rm_eo] = '\0';
   *name = &arg[match[1].rm_so];
   *value = &arg[match[2].rm_so];

   free_reg_exprs(1, &assignment);
 }

/****************************************************************************
 * list_cmos_entry
 *
 * Attempt to list the CMOS entry represented by 'e'.  'show_name' is a
 * boolean value indicating whether the parameter name should be displayed
 * along with its value.  On success, return OK.  On error, print an error
 * message and return 1.
 ****************************************************************************/
static int list_cmos_entry (const cmos_entry_t *e, int show_name)
 { const cmos_enum_t *p;
   unsigned long long value;

   /* sanity check CMOS entry */
   switch (prepare_cmos_read(e))
    { case OK:
         break;

      case CMOS_OP_RESERVED:
         BUG();

      case CMOS_AREA_OUT_OF_RANGE:
         fprintf(stderr, "%s: Can not read coreboot parameter %s because "
                 "layout info specifies out of range CMOS area.\n", prog_name,
                 e->name);
         return 1;

      case CMOS_AREA_OVERLAPS_RTC:
         fprintf(stderr, "%s: Can not read coreboot parameter %s because "
                 "layout info specifies CMOS area that overlaps realtime "
                 "clock area.\n", prog_name, e->name);
         return 1;

      case CMOS_AREA_TOO_WIDE:
         fprintf(stderr, "%s: Can not read coreboot parameter %s because "
                 "layout info specifies CMOS area that is too wide.\n",
                 prog_name, e->name);
         return 1;

      default:
         fprintf(stderr, "%s: Unknown error encountered while attempting to "
                 "read coreboot parameter %s\n", prog_name, e->name);
         return 1;
    }

   /* read the value from CMOS */
   set_iopl(3);
   value = cmos_read(e);
   set_iopl(0);

   /* display the value */
   switch (e->config)
    { case CMOS_ENTRY_ENUM:
         if ((p = find_cmos_enum(e->config_id, value)) == NULL)
          { if (show_name)
               printf("# Bad value -> %s = 0x%llx\n", e->name, value);
            else
               printf("Bad value -> 0x%llx\n", value);
          }
         else
          { if (show_name)
               printf("%s = %s\n", e->name, p->text);
            else
               printf("%s\n", p->text);
          }

         break;

      case CMOS_ENTRY_HEX:
         if (show_name)
            printf("%s = 0x%llx\n", e->name, value);
         else
            printf("0x%llx\n", value);

         break;

      case CMOS_ENTRY_STRING:
         if (show_name)
            printf("%s = %s\n", e->name, (char *)(unsigned long)value);
         else
            printf("%s\n", (char *)(unsigned long)value);

         free((void *)(unsigned long)value);

         break;

      case CMOS_ENTRY_RESERVED:
      default:
         BUG();
    }

   return OK;
 }

/****************************************************************************
 * convert_checksum_value
 *
 * 'value' is the string representation of a checksum value that the user
 * wishes to set using the -c option.  Convert the string to a 16-bit
 * unsigned integer and return the result.  Exit with an error message if
 * 'value' is invalid.
 ****************************************************************************/
static uint16_t convert_checksum_value (const char value[])
 { unsigned long n;
   const char *p;
   uint16_t result;
   int negative;

   for (p = value; isspace(*p); p++);

   negative = (*p == '-');
   n = strtoul(value, (char **) &p, 0);

   if (*p)
    { fprintf(stderr, "%s: Checksum value %s is not a valid integer.\n",
              prog_name, value);
      exit(1);
    }

   if (negative)
    { fprintf(stderr,
              "%s: Checksum must be an unsigned integer.\n", prog_name);
      exit(1);
    }

   result = (uint16_t) n;

   if (result != n)
    { fprintf(stderr,
              "%s: Checksum value must fit within 16 bits.\n", prog_name);
      exit(1);
    }

   return result;
 }

---