fmaptool: Introduce the fmd ("flashmap descriptor") language and compiler

This adds a compiler for a language whose textual representation of flashmap
regions will be used to describe the layout of flash chips that contain more
than just a single CBFS. Direct integration with cbfstool (via a new
command-line switch for the create action) is forthcoming but will be added
separately.

BUG=chromium:461875
TEST=Use Chromium OS's cros_bundle_firmware script on the fmap.dts file for
panther. Using the latter file as a reference, write a corresponding
fmap.fmd file and feed it through fmaptool. Run both binary output files
though the flashmap project's own flashmap_decode utility. Observe only
the expected differences.
BRANCH=None

Change-Id: I06b32d138dbef0a4e5ed43c81bd31c796fd5d669
Signed-off-by: Sol Boucher <solb@chromium.org>
Original-Commit-Id: 005ab67eb594e21489cf31036aedaea87e0c7142
Original-Change-Id: Ia08f28688efdbbfc70c255916b8eb7eb0eb07fb2
Original-Signed-off-by: Sol Boucher <solb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/255031
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: http://review.coreboot.org/9942
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/fmd_scanner.l

@@ -0,0 +1,78 @@
+/*
+ * fmd_scanner.l, scanner generator for flashmap descriptor language
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * 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 of the License.
+ *
+ * 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
+ * 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 "fmd_parser.h"
+
+#include <assert.h>
+#include <string.h>
+
+int parse_integer(char *input, int base);
+int copy_string(const char *input);
+%}
+
+%option noyywrap
+
+MULTIPLIER [KMG]
+
+%%
+
+[[:space:]]+                /* Eat whitespace. */
+#.*$                        /* Eat comments. */
+0{MULTIPLIER}?              |
+[1-9][0-9]*{MULTIPLIER}?    return parse_integer(yytext, 10);
+0[0-9]+{MULTIPLIER}?        return OCTAL;
+0[xX][0-9a-f]+{MULTIPLIER}? return parse_integer(yytext + 2, 16);
+[^#@{}()[:space:]]*         return copy_string(yytext);
+.                           return *yytext;
+
+%%
+
+int parse_integer(char *input, int base)
+{
+	char *multiplier = NULL;
+	unsigned val = strtoul(input, &multiplier, base);
+
+	if (*multiplier) {
+		switch(*multiplier) {
+		case 'K':
+			val *= 1024;
+			break;
+		case 'M':
+			val *= 1024*1024;
+			break;
+		case 'G':
+			val *= 1024*1024*1024;
+			break;
+		default:
+			// If we ever get here, the MULTIPLIER regex is allowing
+			// multiplier suffixes not handled by this code.
+			assert(false);
+		}
+	}
+
+	yylval.intval = val;
+	return INTEGER;
+}
+
+int copy_string(const char *input)
+{
+	yylval.strval = strdup(input);
+	return STRING;
+}