1 /*****************************************************************************\
3 *****************************************************************************
4 * Copyright (C) 2002-2005 The Regents of the University of California.
5 * Produced at the Lawrence Livermore National Laboratory.
6 * Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
10 * This file is part of nvramtool, a utility for reading/writing coreboot
11 * parameters and displaying information from the coreboot table.
12 * For details, see http://coreboot.org/nvramtool.
14 * Please also read the file DISCLAIMER which is included in this software
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License (as published by the
19 * Free Software Foundation) version 2, dated June 1991.
21 * This program is distributed in the hope that it will be useful, but
22 * WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
24 * conditions of the GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
29 \*****************************************************************************/
39 #include "accessors/layout-text.h"
40 #include "input_file.h"
42 #include "cmos_lowlevel.h"
47 typedef void (*op_fn_t) (void);
49 static void op_show_version(void);
50 static void op_show_usage(void);
51 static void op_lbtable_show_info(void);
52 static void op_lbtable_dump(void);
53 static void op_show_param_values(void);
54 static void op_cmos_show_one_param(void);
55 static void op_cmos_show_all_params(void);
56 static void op_cmos_set_one_param(void);
57 static void op_cmos_set_params_stdin(void);
58 static void op_cmos_set_params_file(void);
59 static void op_cmos_checksum(void);
60 static void op_show_layout(void);
61 static void op_write_cmos_dump(void);
62 static void op_read_cmos_dump(void);
63 static void op_show_cmos_hex_dump(void);
64 static void op_show_cmos_dumpfile(void);
65 static int list_one_param(const char name[], int show_name);
66 static int list_all_params(void);
67 static void list_param_enums(const char name[]);
68 static void set_one_param(const char name[], const char value[]);
69 static void set_params(FILE * f);
70 static void parse_assignment(char arg[], const char **name, const char **value);
71 static int list_cmos_entry(const cmos_entry_t * e, int show_name);
72 static uint16_t convert_checksum_value(const char value[]);
74 static const op_fn_t op_fns[] = { op_show_version,
79 op_cmos_show_one_param,
80 op_cmos_show_all_params,
81 op_cmos_set_one_param,
82 op_cmos_set_params_stdin,
83 op_cmos_set_params_file,
88 op_show_cmos_hex_dump,
92 static const hexdump_format_t cmos_dump_format =
93 { 16, 2, "", " | ", " ", " | ", '.' };
95 /****************************************************************************
97 ****************************************************************************/
98 int main(int argc, char *argv[])
100 void *cmos_default = NULL;
101 cmos_layout_get_fn_t fn = get_layout_from_cmos_table;
103 parse_nvramtool_args(argc, argv);
105 /* If we should operate on a CBFS file default to reading the layout
106 * and CMOS contents from it. */
107 if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].found) {
108 open_cbfs(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].param);
109 if (!nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
110 cmos_default = cbfs_find_file("cmos.default", CBFS_COMPONENT_CMOS_DEFAULT, NULL);
111 if (cmos_default == NULL) {
112 fprintf(stderr, "Need a cmos.default in the CBFS image or separate cmos file (-D).\n");
116 fn = get_layout_from_cbfs_file;
119 /* If the user wants to use a specific layout file or explicitly use
120 * the coreboot option table allow him to override previous settings. */
121 if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].found) {
122 set_layout_filename(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].param);
123 fn = get_layout_from_file;
124 } else if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_OPT_TABLE].found) {
125 fn = get_layout_from_cmos_table;
128 /* Allow the user to use a file for the CMOS contents, possibly
129 * overriding a previously opened "cmos.default" file from the CBFS. */
130 if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
134 if ((fd = open(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param, O_RDWR | O_CREAT, 0666)) < 0) {
135 fprintf(stderr, "Couldn't open '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
139 if (fstat(fd, &fd_stat) == -1) {
140 fprintf(stderr, "Couldn't stat '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
144 if (fd_stat.st_size < 128) {
145 lseek(fd, 127, SEEK_SET);
150 cmos_default = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
151 if (cmos_default == MAP_FAILED) {
152 fprintf(stderr, "Couldn't map '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
157 /* Switch to memory based CMOS access. */
159 select_hal(HAL_MEMORY, cmos_default);
162 register_cmos_layout_get_fn(fn);
163 op_fns[nvramtool_op.op]();
168 /****************************************************************************
173 * Show version information for this program.
174 ****************************************************************************/
175 static void op_show_version(void)
177 printf("This is %s version %s.\n", prog_name, prog_version);
180 /****************************************************************************
185 * Show a usage message for this program.
186 ****************************************************************************/
187 static void op_show_usage(void)
192 /****************************************************************************
193 * op_lbtable_show_info
197 * If ARG is present, show coreboot table information specified by ARG.
198 * Else show all possible values for ARG.
199 ****************************************************************************/
200 static void op_lbtable_show_info(void)
202 if (nvramtool_op.param == NULL)
203 list_lbtable_choices();
206 list_lbtable_item(nvramtool_op.param);
210 /****************************************************************************
215 * Do low-level dump of coreboot table.
216 ****************************************************************************/
217 static void op_lbtable_dump(void)
223 /****************************************************************************
224 * op_show_param_values
228 * Show all possible values for parameter NAME.
229 ****************************************************************************/
230 static void op_show_param_values(void)
233 list_param_enums(nvramtool_op.param);
236 /****************************************************************************
237 * op_cmos_show_one_param
241 * Show parameter NAME. If -n is specified, show value only. Else show name
243 ****************************************************************************/
244 static void op_cmos_show_one_param(void)
249 result = list_one_param(nvramtool_op.param,
250 !nvramtool_op_modifiers
251 [NVRAMTOOL_MOD_SHOW_VALUE_ONLY].found);
252 cmos_checksum_verify();
258 /****************************************************************************
259 * op_cmos_show_all_params
263 * Show names and values for all parameters.
264 ****************************************************************************/
265 static void op_cmos_show_all_params(void)
270 result = list_all_params();
271 cmos_checksum_verify();
277 /****************************************************************************
278 * op_cmos_set_one_param
282 * Set parameter NAME to VALUE.
283 ****************************************************************************/
284 static void op_cmos_set_one_param(void)
286 const char *name, *value;
290 /* Separate 'NAME=VALUE' syntax into two strings representing NAME and
293 parse_assignment(nvramtool_op.param, &name, &value);
295 set_one_param(name, value);
298 /****************************************************************************
299 * op_cmos_set_params_stdin
303 * Set parameters according to standard input.
304 ****************************************************************************/
305 static void op_cmos_set_params_stdin(void)
311 /****************************************************************************
312 * op_cmos_set_params_file
316 * Set parameters according to INPUT_FILE.
317 ****************************************************************************/
318 static void op_cmos_set_params_file(void)
322 if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
323 fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
324 prog_name, nvramtool_op.param, strerror(errno));
333 /****************************************************************************
338 * If VALUE is present, set coreboot CMOS checksum to VALUE. Else show
340 ****************************************************************************/
341 static void op_cmos_checksum(void)
347 if (nvramtool_op.param == NULL) {
349 checksum = cmos_checksum_read();
351 printf("0x%x\n", checksum);
353 checksum = convert_checksum_value(nvramtool_op.param);
355 cmos_checksum_write(checksum);
360 /****************************************************************************
365 * Write CMOS layout information to standard output.
366 ****************************************************************************/
367 static void op_show_layout(void)
370 write_cmos_layout(stdout);
373 /****************************************************************************
378 * Write the contents of CMOS memory to a binary file.
379 ****************************************************************************/
380 static void op_write_cmos_dump(void)
382 unsigned char data[CMOS_SIZE];
385 if ((f = fopen(nvramtool_op.param, "w")) == NULL) {
386 fprintf(stderr, "%s: Can not open file %s for writing: %s\n",
387 prog_name, nvramtool_op.param, strerror(errno));
395 if (fwrite(data, 1, CMOS_SIZE, f) != CMOS_SIZE) {
396 fprintf(stderr, "%s: Error writing CMOS data to file %s: %s\n",
397 prog_name, nvramtool_op.param, strerror(errno));
404 /****************************************************************************
409 * Read binary data from a file and write the data to CMOS memory.
410 ****************************************************************************/
411 static void op_read_cmos_dump(void)
413 unsigned char data[CMOS_SIZE];
417 if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
418 fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
419 prog_name, nvramtool_op.param, strerror(errno));
423 if ((nr_bytes = fread(data, 1, CMOS_SIZE, f)) != CMOS_SIZE) {
425 "%s: Error: Only able to read %d bytes of CMOS data "
426 "from file %s. CMOS data is unchanged.\n", prog_name,
427 (int)nr_bytes, nvramtool_op.param);
433 cmos_write_all(data);
437 /****************************************************************************
438 * op_show_cmos_hex_dump
442 * Write a hex dump of CMOS memory to standard output.
443 ****************************************************************************/
444 static void op_show_cmos_hex_dump(void)
446 unsigned char data[CMOS_SIZE];
451 hexdump(data, CMOS_SIZE, 0, stdout, &cmos_dump_format);
454 /****************************************************************************
455 * op_show_cmos_dumpfile
459 * Read binary data from a file (presumably a CMOS dump file) and display a
460 * hex dump of the CMOS data from the file.
461 ****************************************************************************/
462 static void op_show_cmos_dumpfile(void)
464 unsigned char data[CMOS_SIZE];
468 if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
469 fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
470 prog_name, nvramtool_op.param, strerror(errno));
474 nr_bytes = fread(data, 1, CMOS_SIZE, f);
476 hexdump(data, nr_bytes, 0, stdout, &cmos_dump_format);
479 /****************************************************************************
482 * Attempt to list one CMOS parameter given by 'name'. 'show_name' is a
483 * boolean value indicating whether the parameter name should be displayed
484 * along with its value. Return 1 if error was encountered. Else return OK.
485 ****************************************************************************/
486 static int list_one_param(const char name[], int show_name)
488 const cmos_entry_t *e;
490 if (is_checksum_name(name) || ((e = find_cmos_entry(name)) == NULL)) {
491 fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name,
496 if (e->config == CMOS_ENTRY_RESERVED) {
497 fprintf(stderr, "%s: Parameter %s is reserved.\n", prog_name,
502 return (list_cmos_entry(e, show_name) != 0);
505 /****************************************************************************
508 * Attempt to list all CMOS parameters. Return 1 if error was encountered.
510 ****************************************************************************/
511 static int list_all_params(void)
513 const cmos_entry_t *e;
518 for (e = first_cmos_entry(); e != NULL; e = next_cmos_entry(e)) {
519 if ((e->config == CMOS_ENTRY_RESERVED)
520 || is_checksum_name(e->name))
523 if (list_cmos_entry(e, TRUE))
530 /****************************************************************************
533 * List all possible values for CMOS parameter given by 'name'.
534 ****************************************************************************/
535 static void list_param_enums(const char name[])
537 const cmos_entry_t *e;
538 const cmos_enum_t *p;
540 if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL) {
541 fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name,
547 case CMOS_ENTRY_ENUM:
548 for (p = first_cmos_enum_id(e->config_id);
549 p != NULL; p = next_cmos_enum_id(p))
550 printf("%s\n", p->text);
555 printf("Parameter %s requires a %u-bit unsigned integer.\n",
559 case CMOS_ENTRY_STRING:
560 printf("Parameter %s requires a %u-byte string.\n", name,
564 case CMOS_ENTRY_RESERVED:
565 printf("Parameter %s is reserved.\n", name);
573 /****************************************************************************
576 * Set the CMOS parameter given by 'name' to 'value'. The 'name' parameter
577 * is case-sensitive. If we are setting an enum parameter, then 'value' is
578 * interpreted as a case-sensitive string that must match the option name
579 * exactly. If we are setting a 'hex' parameter, then 'value' is treated as
580 * a string representation of an unsigned integer that may be specified in
581 * decimal, hex, or octal.
582 ****************************************************************************/
583 static void set_one_param(const char name[], const char value[])
585 const cmos_entry_t *e;
586 unsigned long long n;
588 if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL) {
589 fprintf(stderr, "%s: CMOS parameter %s not found.", prog_name,
594 switch (prepare_cmos_write(e, value, &n)) {
598 case CMOS_OP_BAD_ENUM_VALUE:
599 fprintf(stderr, "%s: Bad value for parameter %s.", prog_name,
603 case CMOS_OP_NEGATIVE_INT:
605 "%s: This program does not support assignment of negative "
606 "numbers to coreboot parameters.", prog_name);
609 case CMOS_OP_INVALID_INT:
610 fprintf(stderr, "%s: %s is not a valid integer.", prog_name,
614 case CMOS_OP_RESERVED:
616 "%s: Can not modify reserved coreboot parameter %s.",
620 case CMOS_OP_VALUE_TOO_WIDE:
622 "%s: Can not write value %s to CMOS parameter %s that is "
623 "only %d bits wide.", prog_name, value, name,
627 case CMOS_OP_NO_MATCHING_ENUM:
629 "%s: coreboot parameter %s has no matching enums.",
633 case CMOS_AREA_OUT_OF_RANGE:
635 "%s: The CMOS area specified by the layout info for "
636 "coreboot parameter %s is out of range.", prog_name,
640 case CMOS_AREA_OVERLAPS_RTC:
642 "%s: The CMOS area specified by the layout info for "
643 "coreboot parameter %s overlaps the realtime clock area.",
647 case CMOS_AREA_TOO_WIDE:
649 "%s: The CMOS area specified by the layout info for "
650 "coreboot parameter %s is too wide.", prog_name, name);
655 "%s: Unknown error encountered while attempting to modify "
656 "coreboot parameter %s.", prog_name, name);
660 /* write the value to nonvolatile RAM */
663 cmos_checksum_write(cmos_checksum_compute());
668 fprintf(stderr, " CMOS write not performed.\n");
672 /****************************************************************************
675 * Set coreboot parameters according to the contents of file 'f'.
676 ****************************************************************************/
677 static void set_params(FILE * f)
678 { /* First process the input file. Then perform writes only if there were
679 * no problems processing the input. Either all values will be written
680 * successfully or no values will be written.
682 do_cmos_writes(process_input_file(f));
685 /****************************************************************************
688 * Parse the string 'arg' (which supposedly represents an assignment) into a
689 * NAME and a VALUE. If 'arg' does not conform to the proper assignment
690 * syntax, exit with a usage message. Otherwise, on return, 'arg' is broken
691 * into substrings representing NAME and VALUE, and *name and *value are set
692 * to point to these two substrings.
693 ****************************************************************************/
694 static void parse_assignment(char arg[], const char **name, const char **value)
696 static const size_t N_MATCHES = 4;
697 regmatch_t match[N_MATCHES];
700 compile_reg_expr(REG_EXTENDED | REG_NEWLINE, assignment_regex, &assignment);
702 /* Does 'arg' conform to proper assignment syntax? If not, exit with a
705 if (regexec(&assignment, arg, N_MATCHES, match, 0))
708 /* Ok, we found a valid assignment. Break it into two strings
709 * representing NAME and VALUE.
711 arg[match[1].rm_eo] = '\0';
712 arg[match[2].rm_eo] = '\0';
713 *name = &arg[match[1].rm_so];
714 *value = &arg[match[2].rm_so];
716 regfree(&assignment);
719 /****************************************************************************
722 * Attempt to list the CMOS entry represented by 'e'. 'show_name' is a
723 * boolean value indicating whether the parameter name should be displayed
724 * along with its value. On success, return OK. On error, print an error
725 * message and return 1.
726 ****************************************************************************/
727 static int list_cmos_entry(const cmos_entry_t * e, int show_name)
729 const cmos_enum_t *p;
730 unsigned long long value;
733 /* sanity check CMOS entry */
734 switch (prepare_cmos_read(e)) {
738 case CMOS_OP_RESERVED:
741 case CMOS_AREA_OUT_OF_RANGE:
743 "%s: Can not read coreboot parameter %s because "
744 "layout info specifies out of range CMOS area.\n",
748 case CMOS_AREA_OVERLAPS_RTC:
750 "%s: Can not read coreboot parameter %s because "
751 "layout info specifies CMOS area that overlaps realtime "
752 "clock area.\n", prog_name, e->name);
755 case CMOS_AREA_TOO_WIDE:
757 "%s: Can not read coreboot parameter %s because "
758 "layout info specifies CMOS area that is too wide.\n",
764 "%s: Unknown error encountered while attempting to "
765 "read coreboot parameter %s\n", prog_name, e->name);
769 /* read the value from CMOS */
771 value = cmos_read(e);
774 /* display the value */
776 case CMOS_ENTRY_ENUM:
777 if ((p = find_cmos_enum(e->config_id, value)) == NULL) {
779 printf("# Bad value -> %s = 0x%llx\n", e->name,
782 printf("Bad value -> 0x%llx\n", value);
785 printf("%s = %s\n", e->name, p->text);
787 printf("%s\n", p->text);
794 printf("%s = 0x%llx\n", e->name, value);
796 printf("0x%llx\n", value);
800 case CMOS_ENTRY_STRING:
801 w = (char *)(unsigned long)value;
803 if(!isprint((int)(unsigned char)*w)) {
805 printf("# Bad value -> %s\n", e->name);
807 printf("Bad value\n");
816 printf("%s = %s\n", e->name,
817 (char *)(unsigned long)value);
819 printf("%s\n", (char *)(unsigned long)value);
822 free((void *)(unsigned long)value);
826 case CMOS_ENTRY_RESERVED:
834 /****************************************************************************
835 * convert_checksum_value
837 * 'value' is the string representation of a checksum value that the user
838 * wishes to set using the -c option. Convert the string to a 16-bit
839 * unsigned integer and return the result. Exit with an error message if
840 * 'value' is invalid.
841 ****************************************************************************/
842 static uint16_t convert_checksum_value(const char value[])
849 for (p = value; isspace((int)(unsigned char)*p); p++) ;
851 negative = (*p == '-');
852 n = strtoul(value, (char **)&p, 0);
856 "%s: Checksum value %s is not a valid integer.\n",
863 "%s: Checksum must be an unsigned integer.\n",
868 result = (uint16_t) n;
872 "%s: Checksum value must fit within 16 bits.\n",