Move CLI portion of nvramtool into cli/ subdirectory as first step towards librarization.

Also: update one regex wrapper user.

Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6310 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 863 insertions, 0 deletions

diff --git a/util/nvramtool/cli/nvramtool.c b/util/nvramtool/cli/nvramtool.c
new file mode 100644
index 0000000000..e3e7e8875a
--- /dev/null
+++ b/util/nvramtool/cli/nvramtool.c
@@ -0,0 +1,863 @@
+/*****************************************************************************\
+ * 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.,
+ *  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+\*****************************************************************************/
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#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"
+#include "cbfs.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, "", " | ", " ", " | ", '.' };
+
+/****************************************************************************
+ * main
+ ****************************************************************************/
+int main(int argc, char *argv[])
+{
+	void *cmos_default = NULL;
+	cmos_layout_get_fn_t fn = get_layout_from_cmos_table;
+
+	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 if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_OPT_TABLE].found) {
+		fn = get_layout_from_cmos_table;
+	} else if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].found) {
+		open_cbfs(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].param);
+		if (!nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
+			cmos_default = cbfs_find_file("cmos.default", CBFS_COMPONENT_CMOS_DEFAULT, NULL);
+			if (cmos_default == NULL) {
+				fprintf(stderr, "Need a cmos.default in the CBFS image or separate cmos file (-D).\n");
+				exit(1);
+			}
+		}
+	}
+	if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
+		int fd;
+		struct stat fd_stat;
+	       	if ((fd = open(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param, O_RDWR | O_CREAT, 0666)) < 0) {
+			fprintf(stderr, "Couldn't open '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+			exit(1);
+		}
+		if (fstat(fd, &fd_stat) == -1) {
+			fprintf(stderr, "Couldn't stat '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+			exit(1);
+		}
+		if (fd_stat.st_size < 128) {
+			lseek(fd, 127, SEEK_SET);
+			write(fd, "\0", 1);
+			fsync(fd);
+		}
+		cmos_default = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+		if (cmos_default == MAP_FAILED) {
+			fprintf(stderr, "Couldn't map '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
+			exit(1);
+		}
+	}
+	if (cmos_default) {
+		select_hal(HAL_MEMORY, cmos_default);
+		fn = get_layout_from_cbfs_file;
+	}
+
+	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_expr(REG_EXTENDED | REG_NEWLINE, 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];
+
+	regfree(&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;
+	char *w;
+
+	/* 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:
+		w = (char *)(unsigned long)value;
+		while (*w) {
+			if(!isprint(*w)) {
+				if (show_name)
+					printf("# Bad value -> %s\n", e->name);
+				else
+					printf("Bad value\n");
+				break;
+			}
+			w++;
+		}
+
+		if (!*w) {
+
+			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;
+}