Signed-off-by: Stefan Reinauer <stepan@coresystems.de>

Acked-by: Jordan Crouse <jordan.crouse@amd.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2736 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 848 insertions, 0 deletions

diff --git a/util/lxbios/layout_file.c b/util/lxbios/layout_file.c
new file mode 100644
index 0000000000..7027ab93d4
--- /dev/null
+++ b/util/lxbios/layout_file.c
@@ -0,0 +1,848 @@
+/*****************************************************************************\
+ * layout_file.c
+ * $Id: layout_file.c,v 1.3 2006/01/24 00:25:40 dsp_llnl Exp $
+ *****************************************************************************
+ *  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 lxbios, a utility for reading/writing LinuxBIOS
+ *  parameters and displaying information from the LinuxBIOS table.
+ *  For details, see <http://www.llnl.gov/linux/lxbios/>.
+ *
+ *  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 "layout_file.h"
+#include "layout.h"
+#include "cmos_lowlevel.h"
+#include "reg_expr.h"
+
+static void process_layout_file (FILE *f);
+static void skip_past_start (FILE *f);
+static int process_entry (FILE *f, int skip_add);
+static int process_enum (FILE *f, int skip_add);
+static void process_checksum_info (FILE *f);
+static void skip_remaining_lines (FILE *f);
+static void create_entry (cmos_entry_t *cmos_entry,
+                          const char start_bit_str[], const char length_str[],
+                          const char config_str[], const char config_id_str[],
+                          const char name_str[]);
+static void try_add_layout_file_entry (const cmos_entry_t *cmos_entry);
+static void create_enum (cmos_enum_t *cmos_enum, const char id_str[],
+                         const char value_str[], const char text_str[]);
+static void try_add_cmos_enum (const cmos_enum_t *cmos_enum);
+static void set_checksum_info (const char start_str[], const char end_str[],
+                               const char index_str[]);
+static char cmos_entry_char_value (cmos_entry_config_t config);
+static int get_layout_file_line (FILE *f, char line[], int line_buf_size);
+static unsigned string_to_unsigned (const char str[], const char str_name[]);
+static unsigned long string_to_unsigned_long (const char str[],
+                                              const char str_name[]);
+static unsigned long do_string_to_unsigned_long (const char str[],
+                                                 const char str_name[],
+                                                 const char blurb[]);
+
+/* matches either a blank line or a comment line */
+static const char blank_or_comment_regex[] =
+   /* a blank line */
+   "(^[[:space:]]+$)"
+
+   "|"  /* or ... */
+
+   /* a line consisting of: optional whitespace followed by */
+   "(^[[:space:]]*"
+   /* a '#' character and optionally, additional characters */
+   "#.*$)";
+
+static regex_t blank_or_comment_expr;
+
+/* matches the line in a CMOS layout file indicating the start of the
+ * "entries" section.
+ */
+static const char start_entries_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by "entries" */
+   "entries"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t start_entries_expr;
+
+/* matches the line in a CMOS layout file indicating the start of the
+ * "enumerations" section
+ */
+static const char start_enums_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by "enumerations" */
+   "enumerations"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t start_enums_expr;
+
+/* matches the line in a CMOS layout file indicating the start of the
+ * "checksums" section
+ */
+static const char start_checksums_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by "checksums" */
+   "checksums"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t start_checksums_expr;
+
+/* matches a line in a CMOS layout file specifying a CMOS entry */
+static const char entries_line_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by a chunk of nonwhitespace for start-bit field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for length field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for config field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for config-ID field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for name field */
+   "([^[:space:]]+)"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t entries_line_expr;
+
+/* matches a line in a CMOS layout file specifying a CMOS enumeration */
+static const char enums_line_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by a chunk of nonwhitespace for ID field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for value field */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for text field */
+   "([^[:space:]]+)"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t enums_line_expr;
+
+/* matches the line in a CMOS layout file specifying CMOS checksum
+ * information
+ */
+static const char checksum_line_regex[] =
+   /* optional whitespace */
+   "^[[:space:]]*"
+   /* followed by "checksum" */
+   "checksum"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for first bit of summed area */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for last bit of summed area */
+   "([^[:space:]]+)"
+   /* followed by one or more whitespace characters */
+   "[[:space:]]+"
+   /* followed by a chunk of nonwhitespace for checksum location bit */
+   "([^[:space:]]+)"
+   /* followed by optional whitespace */
+   "[[:space:]]*$";
+
+static regex_t checksum_line_expr;
+
+static const int LINE_BUF_SIZE = 256;
+
+static int line_num;
+
+static const char *layout_filename = NULL;
+
+/****************************************************************************
+ * set_layout_filename
+ *
+ * Set the name of the file we will obtain CMOS layout information from.
+ ****************************************************************************/
+void set_layout_filename (const char filename[])
+ { layout_filename = filename; }
+
+/****************************************************************************
+ * get_layout_from_file
+ *
+ * Read CMOS layout information from the user-specified CMOS layout file.
+ ****************************************************************************/
+void get_layout_from_file (void)
+ { FILE *f;
+
+   assert(layout_filename != NULL);
+
+   if ((f = fopen(layout_filename, "r")) == NULL)
+    { fprintf(stderr, "%s: Can not open CMOS layout file %s for reading: "
+              "%s\n", prog_name, layout_filename, strerror(errno));
+      exit(1);
+    }
+
+   process_layout_file(f);
+   fclose(f);
+ }
+
+/****************************************************************************
+ * write_cmos_layout
+ *
+ * Write CMOS layout information to file 'f'.  The output is written in the
+ * format that CMOS layout files adhere to.
+ ****************************************************************************/
+void write_cmos_layout (FILE *f)
+ { const cmos_entry_t *cmos_entry;
+   const cmos_enum_t *cmos_enum;
+   cmos_checksum_layout_t layout;
+
+   fprintf(f, "entries\n");
+
+   for (cmos_entry = first_cmos_entry();
+        cmos_entry != NULL;
+        cmos_entry = next_cmos_entry(cmos_entry))
+      fprintf(f, "%u %u %c %u %s\n", cmos_entry->bit, cmos_entry->length,
+              cmos_entry_char_value(cmos_entry->config),
+              cmos_entry->config_id, cmos_entry->name);
+
+   fprintf(f, "\nenumerations\n");
+
+   for (cmos_enum = first_cmos_enum();
+        cmos_enum != NULL;
+        cmos_enum = next_cmos_enum(cmos_enum))
+      fprintf(f, "%u %llu %s\n", cmos_enum->config_id, cmos_enum->value,
+              cmos_enum->text);
+
+   layout.summed_area_start = cmos_checksum_start;
+   layout.summed_area_end = cmos_checksum_end;
+   layout.checksum_at = cmos_checksum_index;
+   checksum_layout_to_bits(&layout);
+   fprintf(f, "\nchecksums\nchecksum %u %u %u\n", layout.summed_area_start,
+           layout.summed_area_end, layout.checksum_at);
+ }
+
+/****************************************************************************
+ * process_layout_file
+ *
+ * Read CMOS layout information from file 'f' and add it to our internal
+ * repository.
+ ****************************************************************************/
+static void process_layout_file (FILE *f)
+ { compile_reg_exprs(REG_EXTENDED | REG_NEWLINE, 7,
+                     blank_or_comment_regex, &blank_or_comment_expr,
+                     start_entries_regex, &start_entries_expr,
+                     entries_line_regex, &entries_line_expr,
+                     start_enums_regex, &start_enums_expr,
+                     enums_line_regex, &enums_line_expr,
+                     start_checksums_regex, &start_checksums_expr,
+                     checksum_line_regex, &checksum_line_expr);
+   line_num = 1;
+   skip_past_start(f);
+
+   /* Skip past all entries.  We will process these later when we make a
+    * second pass through the file.
+    */
+   while (!process_entry(f, 1));
+
+   /* Process all enums, adding them to our internal repository as we go. */
+
+   if (process_enum(f, 0))
+    { fprintf(stderr, "%s: Error: CMOS layout file contains no "
+              "enumerations.\n", prog_name);
+      exit(1);
+    }
+
+   while (!process_enum(f, 0));
+
+   /* Go back to start of file. */
+   line_num = 1;
+   fseek(f, 0, SEEK_SET);
+
+   skip_past_start(f);
+
+   /* Process all entries, adding them to the repository as we go.  We must
+    * add the entries after the enums, even though they appear in the layout
+    * file before the enums.  This is because the entries are sanity checked
+    * against the enums as they are added.
+    */
+
+   if (process_entry(f, 0))
+    { fprintf(stderr, "%s: Error: CMOS layout file contains no entries.\n",
+              prog_name);
+      exit(1);
+    }
+
+   while (!process_entry(f, 0));
+
+   /* Skip past all enums.  They have already been processed. */
+   while (!process_enum(f, 1));
+
+   /* Process CMOS checksum info. */
+   process_checksum_info(f);
+
+   /* See if there are any lines left to process.  If so, verify that they are
+    * all either blank lines or comments.
+    */
+   skip_remaining_lines(f);
+
+   free_reg_exprs(7, &blank_or_comment_expr, &start_entries_expr,
+                  &entries_line_expr, &start_enums_expr,
+                  &enums_line_expr, &start_checksums_expr,
+                  &checksum_line_expr);
+ }
+
+/****************************************************************************
+ * skip_past_start
+ *
+ * Skip past the line that marks the start of the "entries" section.
+ ****************************************************************************/
+static void skip_past_start (FILE *f)
+ { char line[LINE_BUF_SIZE];
+
+   for (; ; line_num++)
+    { if (get_layout_file_line(f, line, LINE_BUF_SIZE))
+       { fprintf(stderr,
+                 "%s: \"entries\" line not found in CMOS layout file.\n",
+                 prog_name);
+         exit(1);
+       }
+
+      if (!regexec(&blank_or_comment_expr, line, 0, NULL, 0))
+         continue;
+
+      if (!regexec(&start_entries_expr, line, 0, NULL, 0))
+         break;
+
+      fprintf(stderr, "%s: Syntax error on line %d of CMOS layout file.  "
+              "\"entries\" line expected.\n", prog_name, line_num);
+      exit(1);
+    }
+
+   line_num++;
+ }
+
+/****************************************************************************
+ * process_entry
+ *
+ * Get an entry from "entries" section of file and add it to our repository
+ * of layout information.  Return 0 if an entry was found and processed.
+ * Return 1 if there are no more entries.
+ ****************************************************************************/
+static int process_entry (FILE *f, int skip_add)
+ { static const size_t N_MATCHES = 6;
+   char line[LINE_BUF_SIZE];
+   regmatch_t match[N_MATCHES];
+   cmos_entry_t cmos_entry;
+   int result;
+
+   result = 1;
+
+   for (; ; line_num++)
+    { if (get_layout_file_line(f, line, LINE_BUF_SIZE))
+       { fprintf(stderr,
+                 "%s: Unexpected end of CMOS layout file reached while "
+                 "reading \"entries\" section.\n", prog_name);
+         exit(1);
+       }
+
+      if (!regexec(&blank_or_comment_expr, line, 0, NULL, 0))
+         continue;
+
+      if (regexec(&entries_line_expr, line, N_MATCHES, match, 0))
+       { if (regexec(&start_enums_expr, line, 0, NULL, 0))
+          { fprintf(stderr, "%s: Syntax error on line %d of CMOS layout "
+                    "file.\n", prog_name, line_num);
+            exit(1);
+          }
+
+         break;  /* start of enumerations reached: no more entries */
+       }
+
+      result = 0;  /* next layout entry found */
+
+      if (skip_add)
+         break;
+
+      line[match[1].rm_eo] = '\0';
+      line[match[2].rm_eo] = '\0';
+      line[match[3].rm_eo] = '\0';
+      line[match[4].rm_eo] = '\0';
+      line[match[5].rm_eo] = '\0';
+      create_entry(&cmos_entry, &line[match[1].rm_so], &line[match[2].rm_so],
+                   &line[match[3].rm_so], &line[match[4].rm_so],
+                   &line[match[5].rm_so]);
+      try_add_layout_file_entry(&cmos_entry);
+      break;
+    }
+
+   line_num++;
+   return result;
+ }
+
+/****************************************************************************
+ * process_enum
+ *
+ * Get an enuneration from "enumerations" section of file and add it to our
+ * repository of layout information.  Return 0 if an enumeration was found
+ * and processed.  Return 1 if there are no more enumerations.
+ ****************************************************************************/
+static int process_enum (FILE *f, int skip_add)
+ { static const size_t N_MATCHES = 4;
+   char line[LINE_BUF_SIZE];
+   regmatch_t match[N_MATCHES];
+   cmos_enum_t cmos_enum;
+   int result;
+
+   result = 1;
+
+   for (; ; line_num++)
+    { if (get_layout_file_line(f, line, LINE_BUF_SIZE))
+       { fprintf(stderr,
+                 "%s: Unexpected end of CMOS layout file reached while "
+                 "reading \"enumerations\" section.\n", prog_name);
+         exit(1);
+       }
+
+      if (!regexec(&blank_or_comment_expr, line, 0, NULL, 0))
+         continue;
+
+      if (regexec(&enums_line_expr, line, N_MATCHES, match, 0))
+       { if (regexec(&start_checksums_expr, line, 0, NULL, 0))
+          { fprintf(stderr, "%s: Syntax error on line %d of CMOS layout "
+                    "file.\n", prog_name, line_num);
+            exit(1);
+          }
+
+         break;  /* start of checksums reached: no more enumerations */
+       }
+
+      result = 0;  /* next layout enumeration found */
+
+      if (skip_add)
+         break;
+
+      line[match[1].rm_eo] = '\0';
+      line[match[2].rm_eo] = '\0';
+      line[match[3].rm_eo] = '\0';
+      create_enum(&cmos_enum, &line[match[1].rm_so], &line[match[2].rm_so],
+                  &line[match[3].rm_so]);
+      try_add_cmos_enum(&cmos_enum);
+      break;
+    }
+
+   line_num++;
+   return result;
+ }
+
+/****************************************************************************
+ * process_checksum_info
+ *
+ * Get line conatining CMOS checksum information.
+ ****************************************************************************/
+static void process_checksum_info (FILE *f)
+ { static const size_t N_MATCHES = 4;
+   char line[LINE_BUF_SIZE];
+   regmatch_t match[N_MATCHES];
+
+   for (; ; line_num++)
+    { if (get_layout_file_line(f, line, LINE_BUF_SIZE))
+       { fprintf(stderr,
+                 "%s: Unexpected end of CMOS layout file reached while "
+                 "reading \"checksums\" section.\n", prog_name);
+         exit(1);
+       }
+
+      if (!regexec(&blank_or_comment_expr, line, 0, NULL, 0))
+         continue;
+
+      if (regexec(&checksum_line_expr, line, N_MATCHES, match, 0))
+       { fprintf(stderr, "%s: Syntax error on line %d of CMOS layout "
+                 "file.  \"checksum\" line expected.\n", prog_name,
+                 line_num);
+         exit(1);
+       }
+
+      /* checksum line found */
+      line[match[1].rm_eo] = '\0';
+      line[match[2].rm_eo] = '\0';
+      line[match[3].rm_eo] = '\0';
+      set_checksum_info(&line[match[1].rm_so], &line[match[2].rm_so],
+                        &line[match[3].rm_so]);
+      break;
+    }
+ }
+
+/****************************************************************************
+ * skip_remaining_lines
+ *
+ * Get any remaining lines of unprocessed input.  Complain if we find a line
+ * that contains anything other than comments and whitespace.
+ ****************************************************************************/
+static void skip_remaining_lines (FILE *f)
+ { char line[LINE_BUF_SIZE];
+
+   for (line_num++;
+        get_layout_file_line(f, line, LINE_BUF_SIZE) == OK;
+        line_num++)
+    { if (regexec(&blank_or_comment_expr, line, 0, NULL, 0))
+       { fprintf(stderr, "%s: Syntax error on line %d of CMOS layout file: "
+                 "Only comments and/or whitespace allowed after "
+                 "\"checksum\" line.\n", prog_name, line_num);
+         exit(1);
+       }
+    }
+ }
+
+/****************************************************************************
+ * create_entry
+ *
+ * Create a CMOS entry structure representing the given information.  Perform
+ * sanity checking on input parameters.
+ ****************************************************************************/
+static void create_entry (cmos_entry_t *cmos_entry,
+                          const char start_bit_str[], const char length_str[],
+                          const char config_str[], const char config_id_str[],
+                          const char name_str[])
+ { cmos_entry->bit = string_to_unsigned(start_bit_str, "start-bit");
+   cmos_entry->length = string_to_unsigned(length_str, "length");
+
+   if (config_str[1] != '\0')
+      goto bad_config_str;
+
+   switch (config_str[0])
+    { case 'e':
+         cmos_entry->config = CMOS_ENTRY_ENUM;
+         break;
+
+      case 'h':
+         cmos_entry->config = CMOS_ENTRY_HEX;
+         break;
+
+      case 'r':
+         cmos_entry->config = CMOS_ENTRY_RESERVED;
+         break;
+
+      default:
+         goto bad_config_str;
+    }
+
+   cmos_entry->config_id = string_to_unsigned(config_id_str, "config-ID");
+
+   if (strlen(name_str) >= CMOS_MAX_NAME_LENGTH)
+    { fprintf(stderr, "%s: Error on line %d of CMOS layout file: name too "
+              "long (max length is %d).\n", prog_name, line_num,
+              CMOS_MAX_NAME_LENGTH - 1);
+      exit(1);
+    }
+
+   strcpy(cmos_entry->name, name_str);
+   return;
+
+bad_config_str:
+   fprintf(stderr, "%s: Error on line %d of CMOS layout file: 'e', 'h', or "
+           "'r' expected for config value.\n", prog_name, line_num);
+   exit(1);
+ }
+
+/****************************************************************************
+ * try_add_layout_file_entry
+ *
+ * Attempt to add the given CMOS entry to our internal repository.  Exit with
+ * an error message on failure.
+ ****************************************************************************/
+static void try_add_layout_file_entry (const cmos_entry_t *cmos_entry)
+ { const cmos_entry_t *conflict;
+
+   switch (add_cmos_entry(cmos_entry, &conflict))
+    { case OK:
+         return;
+
+      case CMOS_AREA_OUT_OF_RANGE:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  Area "
+                 "covered by entry %s is out of range.\n", prog_name,
+                 line_num, cmos_entry->name);
+         break;
+
+      case CMOS_AREA_TOO_WIDE:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  Area "
+                 "covered by entry %s is too wide.\n", prog_name, line_num,
+                 cmos_entry->name);
+         break;
+
+      case LAYOUT_ENTRY_OVERLAP:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  Layouts "
+                 "overlap for entries %s and %s.\n", prog_name, line_num,
+                 cmos_entry->name, conflict->name);
+         break;
+
+      case LAYOUT_ENTRY_BAD_LENGTH:
+         /* Silently ignore entries with zero length.  Although this should
+          * never happen in practice, we should handle the case in a
+          * reasonable manner just to be safe.
+          */
+         return;
+
+      default:
+         BUG();
+    }
+
+   exit(1);
+ }
+
+/****************************************************************************
+ * create_enum
+ *
+ * Create a CMOS enumeration structure representing the given information.
+ * Perform sanity checking on input parameters.
+ ****************************************************************************/
+static void create_enum (cmos_enum_t *cmos_enum, const char id_str[],
+                         const char value_str[], const char text_str[])
+ { cmos_enum->config_id = string_to_unsigned(id_str, "ID");
+   cmos_enum->value = string_to_unsigned_long(value_str, "value");
+
+   if (strlen(text_str) >= CMOS_MAX_TEXT_LENGTH)
+    { fprintf(stderr, "%s: Error on line %d of CMOS layout file: text too "
+              "long (max length is %d).\n", prog_name, line_num,
+              CMOS_MAX_TEXT_LENGTH - 1);
+      exit(1);
+    }
+
+   strcpy(cmos_enum->text, text_str);
+ }
+
+/****************************************************************************
+ * try_add_cmos_enum
+ *
+ * Attempt to add the given CMOS enum to our internal repository.  Exit with
+ * an error message on failure.
+ ****************************************************************************/
+static void try_add_cmos_enum (const cmos_enum_t *cmos_enum)
+ { switch (add_cmos_enum(cmos_enum))
+    { case OK:
+         return;
+
+      case LAYOUT_DUPLICATE_ENUM:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file: "
+                 "Enumeration found with duplicate ID/value combination.\n",
+                 prog_name, line_num);
+         break;
+
+      default:
+         BUG();
+    }
+
+   exit(1);
+ }
+
+/****************************************************************************
+ * set_checksum_info
+ *
+ * Set CMOS checksum information according to input parameters and perform
+ * sanity checking on input parameters.
+ ****************************************************************************/
+static void set_checksum_info (const char start_str[], const char end_str[],
+                               const char index_str[])
+ { cmos_checksum_layout_t layout;
+
+   /* These are bit positions that we want to convert to byte positions. */
+   layout.summed_area_start =
+         string_to_unsigned(start_str, "CMOS checksummed area start");
+   layout.summed_area_end =
+         string_to_unsigned(end_str, "CMOS checksummed area end");
+   layout.checksum_at =
+         string_to_unsigned(index_str, "CMOS checksum location");
+
+   switch (checksum_layout_to_bytes(&layout))
+    { case OK:
+         break;
+
+      case LAYOUT_SUMMED_AREA_START_NOT_ALIGNED:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksummed area start is not byte-aligned.\n", prog_name,
+                 line_num);
+         goto fail;
+
+      case LAYOUT_SUMMED_AREA_END_NOT_ALIGNED:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksummed area end is not byte-aligned.\n", prog_name,
+                 line_num);
+         goto fail;
+
+      case LAYOUT_CHECKSUM_LOCATION_NOT_ALIGNED:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksum location is not byte-aligned.\n", prog_name,
+                 line_num);
+         goto fail;
+
+      case LAYOUT_INVALID_SUMMED_AREA:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksummed area end must be greater than CMOS checksummed "
+                 "area start.\n", prog_name, line_num);
+         goto fail;
+
+      case LAYOUT_CHECKSUM_OVERLAPS_SUMMED_AREA:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksum overlaps checksummed area.\n", prog_name,
+                 line_num);
+         goto fail;
+
+      case LAYOUT_SUMMED_AREA_OUT_OF_RANGE:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksummed area out of range.\n", prog_name, line_num);
+         goto fail;
+
+      case LAYOUT_CHECKSUM_LOCATION_OUT_OF_RANGE:
+         fprintf(stderr, "%s: Error on line %d of CMOS layout file.  CMOS "
+                 "checksum location out of range.\n", prog_name, line_num);
+         goto fail;
+
+      default:
+         BUG();
+    }
+
+   cmos_checksum_start = layout.summed_area_start;
+   cmos_checksum_end = layout.summed_area_end;
+   cmos_checksum_index = layout.checksum_at;
+   return;
+
+fail:
+   exit(1);
+ }
+
+/****************************************************************************
+ * cmos_entry_char_value
+ *
+ * Return the character representation of 'config'.
+ ****************************************************************************/
+static char cmos_entry_char_value (cmos_entry_config_t config)
+ { switch (config)
+    { case CMOS_ENTRY_ENUM:
+         return 'e';
+
+      case CMOS_ENTRY_HEX:
+         return 'h';
+
+      case CMOS_ENTRY_RESERVED:
+         return 'r';
+
+      default:
+         BUG();
+    }
+
+   return 0;  /* not reached */
+ }
+
+/****************************************************************************
+ * get_layout_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
+ * failure.
+ ****************************************************************************/
+static int get_layout_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 CMOS layout file: Maximum "
+                 "line length exceeded.  Max is %d characters.\n", prog_name,
+                 line_num, line_buf_size - 2);
+         break;
+    }
+
+   exit(1);
+   return 1;  /* keep compiler happy */
+ }
+
+/****************************************************************************
+ * string_to_unsigned
+ *
+ * Convert the string 'str' to an unsigned and return the result.
+ ****************************************************************************/
+static unsigned string_to_unsigned (const char str[], const char str_name[])
+ { unsigned long n;
+   unsigned z;
+
+   n = do_string_to_unsigned_long(str, str_name, "");
+
+   if ((z = (unsigned) n) != n)
+    { /* This could happen on an architecture in which sizeof(unsigned) <
+       * sizeof(unsigned long).
+       */
+      fprintf(stderr, "%s: Error on line %d of CMOS layout file: %s value is "
+              "out of range.\n", prog_name, line_num, str_name);
+      exit(1);
+    }
+
+   return z;
+ }
+
+/****************************************************************************
+ * string_to_unsigned_long
+ *
+ * Convert the string 'str' to an unsigned long and return the result.
+ ****************************************************************************/
+static unsigned long string_to_unsigned_long (const char str[],
+                                              const char str_name[])
+ { return do_string_to_unsigned_long(str, str_name, " long"); }
+
+/****************************************************************************
+ * do_string_to_unsigned_long
+ *
+ * Convert the string 'str' to an unsigned long and return the result.  Exit
+ * with an appropriate error message on failure.
+ ****************************************************************************/
+static unsigned long do_string_to_unsigned_long (const char str[],
+                                                 const char str_name[],
+                                                 const char blurb[])
+ { unsigned long n;
+   char *p;
+
+   n = strtoul(str, &p, 0);
+
+   if (*p != '\0')
+    { fprintf(stderr, "%s: Error on line %d of CMOS layout file: %s is not a "
+              "valid unsigned%s integer.\n", prog_name,
+              line_num, str_name, blurb);
+      exit(1);
+    }
+
+   return n;
+ }