coreboot-kgpe-d16/util/nvramtool/input_file.c

292 lines
8.8 KiB
C

/*****************************************************************************\
* input_file.c
*****************************************************************************
* Copyright (C) 2002-2005 The Regents of the University of California.
* Produced at the Lawrence Livermore National Laboratory.
* Written by David S. 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 https://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.
\*****************************************************************************/
#include "common.h"
#include "input_file.h"
#include "layout.h"
#include "cmos_ops.h"
#include "cmos_lowlevel.h"
#include "reg_expr.h"
static int get_input_file_line(FILE * f, char line[], int line_buf_size);
static unsigned long long try_prepare_cmos_write(const cmos_entry_t * e,
const char value_str[]);
/* matches either a blank line or a comment line */
static const char blank_or_comment_regex[] =
/* a blank line */
"(^[[:space:]]+$)" "|" /* or ... */
/* a line consisting of: optional whitespace followed by */
"(^[[:space:]]*"
/* a '#' character and optionally, additional characters */
"#.*$)";
/* matches an assignment line */
const char assignment_regex[] =
/* optional whitespace */
"^[[:space:]]*"
/* followed by a coreboot parameter name */
"([^[:space:]]+)"
/* followed by optional whitespace */
"[[:space:]]*"
/* followed by an '=' character */
"="
/* followed by optional whitespace */
"[[:space:]]*"
/* followed by a value that may contain embedded whitespace */
"([^[:space:]]+([[:space:]]+[^[:space:]]+)*)+"
/* followed by optional whitespace */
"[[:space:]]*$";
static int line_num;
/****************************************************************************
* 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;
}
/****************************************************************************
* do_cmos_writes
*
* 'list' is a linked list of pending CMOS write operations that have passed
* all sanity checks. Perform all write operations, destroying the list as
* we go.
****************************************************************************/
void do_cmos_writes(cmos_write_t * list)
{
cmos_write_t *item;
set_iopl(3);
while (list != NULL) {
cmos_entry_t e;
item = list;
e.bit = item->bit;
e.length = item->length;
e.config = item->config;
list = item->next;
cmos_write(&e, item->value);
free(item);
}
cmos_checksum_write(cmos_checksum_compute());
set_iopl(0);
}
/****************************************************************************
* get_input_file_line
*
* Get a line of input from file 'f'. Store result in 'line' which is an
* array of 'line_buf_size' bytes. Return OK on success or an error code on
* error.
****************************************************************************/
static int get_input_file_line(FILE * f, char line[], int line_buf_size)
{
switch (get_line_from_file(f, line, line_buf_size)) {
case OK:
return OK;
case LINE_EOF:
return LINE_EOF;
case LINE_TOO_LONG:
fprintf(stderr,
"%s: Error on line %d of input file: Maximum line "
"length exceeded. Max is %d characters.\n", prog_name,
line_num, line_buf_size - 2);
break;
default:
BUG();
}
exit(1);
return 1; /* keep compiler happy */
}
/****************************************************************************
* try_prepare_cmos_write
*
* Attempt to convert 'value_str' to an integer representation for storage in
* CMOS memory. On success, return the converted value. On error, exit with
* an error message.
****************************************************************************/
static unsigned long long try_prepare_cmos_write(const cmos_entry_t * e,
const char value_str[])
{
unsigned long long value;
switch (prepare_cmos_write(e, value_str, &value)) {
case OK:
return value;
case CMOS_OP_BAD_ENUM_VALUE:
fprintf(stderr,
"%s: Error on line %d of input file: Bad value for "
"parameter %s.", prog_name, line_num, e->name);
break;
case CMOS_OP_NEGATIVE_INT:
fprintf(stderr,
"%s: Error on line %d of input file: This program "
"does not support assignment of negative numbers to "
"coreboot parameters.", prog_name, line_num);
break;
case CMOS_OP_INVALID_INT:
fprintf(stderr,
"%s: Error on line %d of input file: %s is not a "
"valid integer.", prog_name, line_num, value_str);
break;
case CMOS_OP_RESERVED:
fprintf(stderr,
"%s: Error on line %d of input file: Can not modify "
"reserved coreboot parameter %s.", prog_name, line_num,
e->name);
break;
case CMOS_OP_VALUE_TOO_WIDE:
fprintf(stderr,
"%s: Error on line %d of input file: Can not write "
"value %s to CMOS parameter %s that is only %d bits wide.",
prog_name, line_num, value_str, e->name, e->length);
break;
case CMOS_OP_NO_MATCHING_ENUM:
fprintf(stderr,
"%s: coreboot parameter %s has no matching enums.",
prog_name, e->name);
break;
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,
e->name);
break;
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, e->name);
break;
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,
e->name);
break;
default:
fprintf(stderr,
"%s: Unknown error encountered while attempting to modify "
"coreboot parameter %s.", prog_name, e->name);
break;
}
fprintf(stderr, " No CMOS writes performed.\n");
exit(1);
return 0; /* keep compiler happy */
}