/****************************************************************************
* get_cmos_checksum_info
*
* Get layout information for CMOS checksum.
****************************************************************************/
static void get_cmos_checksum_info(void)
{
const cmos_entry_t *e;
struct cmos_checksum *checksum;
cmos_checksum_layout_t layout;
unsigned index, index2;
checksum = (struct cmos_checksum *)next_cmos_rec((const struct lb_record *)first_cmos_table_enum(), LB_TAG_OPTION_CHECKSUM);
if (checksum != NULL) { /* We are lucky. The coreboot table hints us to the checksum.
* We might have to check the type field here though.
*/
layout.summed_area_start = checksum->range_start;
layout.summed_area_end = checksum->range_end;
layout.checksum_at = checksum->location;
try_convert_checksum_layout(&layout);
cmos_checksum_start = layout.summed_area_start;
cmos_checksum_end = layout.summed_area_end;
cmos_checksum_index = layout.checksum_at;
return;
}
if ((e = find_cmos_entry(checksum_param_name)) == NULL)
return;
/* If we get here, we are unlucky. The CMOS option table contains the
* location of the CMOS checksum. However, there is no information
* regarding which bytes of the CMOS area the checksum is computed over.
* Thus we have to hope our presets will be fine.
*/
if (e->bit % 8) {
fprintf(stderr,
"%s: Error: CMOS checksum is not byte-aligned.\n",
prog_name);
exit(1);
}
index = e->bit / 8;
index2 = index + 1; /* The CMOS checksum occupies 16 bits. */
if (verify_cmos_byte_index(index) || verify_cmos_byte_index(index2)) {
fprintf(stderr,
"%s: Error: CMOS checksum location out of range.\n",
prog_name);
exit(1);
}
if (((index >= cmos_checksum_start) && (index <= cmos_checksum_end)) ||
(((index2) >= cmos_checksum_start)
&& ((index2) <= cmos_checksum_end))) {
fprintf(stderr,
"%s: Error: CMOS checksum overlaps checksummed area.\n",
prog_name);
exit(1);
}
cmos_checksum_index = index;
}
/****************************************************************************
* 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_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();
}
}
/****************************************************************************
* process_input_file
*
* Read the contents of file 'f' and return a pointer to a list of pending
* write operations. Perform sanity checking on all write operations and
* exit with an error message if there is a problem.
****************************************************************************/
cmos_write_t *process_input_file(FILE * f)
{
static const int LINE_BUF_SIZE = 256;
static const size_t N_MATCHES = 4;
char line[LINE_BUF_SIZE];
const char *name, *value;
cmos_write_t *list, *item, **p;
regex_t blank_or_comment, assignment;
regmatch_t match[N_MATCHES];
const cmos_entry_t *e;
list = NULL;
p = &list;
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, blank_or_comment_regex, &blank_or_comment);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, assignment_regex, &assignment);
/* each iteration processes one line from input file */
for (line_num = 1; get_input_file_line(f, line, LINE_BUF_SIZE) == OK; line_num++) { /* skip comments and blank lines */
if (!regexec(&blank_or_comment, line, 0, NULL, 0))
continue;
/* Is this a valid assignment line? If not, then it's a syntax
* error.
*/
if (regexec(&assignment, line, N_MATCHES, match, 0)) {
fprintf(stderr,
"%s: Syntax error on line %d of input file.\n",
prog_name, line_num);
exit(1);
}
/* OK, we found an assignment. Break the line into substrings
* representing the lefthand and righthand sides of the assignment.
*/
line[match[1].rm_eo] = '\0';
line[match[2].rm_eo] = '\0';
name = &line[match[1].rm_so];
value = &line[match[2].rm_so];
/* now look up the coreboot parameter name */
if (is_checksum_name(name)
|| (e = find_cmos_entry(name)) == NULL) {
fprintf(stderr,
"%s: Error on line %d of input file: CMOS parameter "
"%s not found.\n", prog_name, line_num, name);
exit(1);
}
/* At this point, we figure out what numeric value needs to be written
* to which location. At the same time, we perform sanity checking on
* the write operation.
*/
if ((item = (cmos_write_t *) malloc(sizeof(*item))) == NULL)
out_of_memory();
item->bit = e->bit;
item->length = e->length;
item->config = e->config;
item->value = try_prepare_cmos_write(e, value);
/* Append write operation to pending write list. */
item->next = NULL;
*p = item;
p = &item->next;
}
regfree(&blank_or_comment);
regfree(&assignment);
return list;
}
/****************************************************************************
* 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);
}
