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Linux/scripts/dtc/dtc.c

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  1 /*
  2  * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
  3  *
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation; either version 2 of the
  8  * License, or (at your option) any later version.
  9  *
 10  *  This program is distributed in the hope that it will be useful,
 11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 13  *  General Public License for more details.
 14  *
 15  *  You should have received a copy of the GNU General Public License
 16  *  along with this program; if not, write to the Free Software
 17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 18  *                                                                   USA
 19  */
 20 
 21 #include <sys/stat.h>
 22 
 23 #include "dtc.h"
 24 #include "srcpos.h"
 25 
 26 /*
 27  * Command line options
 28  */
 29 int quiet;              /* Level of quietness */
 30 int reservenum;         /* Number of memory reservation slots */
 31 int minsize;            /* Minimum blob size */
 32 int padsize;            /* Additional padding to blob */
 33 int alignsize;          /* Additional padding to blob accroding to the alignsize */
 34 int phandle_format = PHANDLE_EPAPR;     /* Use linux,phandle or phandle properties */
 35 int generate_symbols;   /* enable symbols & fixup support */
 36 int generate_fixups;            /* suppress generation of fixups on symbol support */
 37 int auto_label_aliases;         /* auto generate labels -> aliases */
 38 
 39 static int is_power_of_2(int x)
 40 {
 41         return (x > 0) && ((x & (x - 1)) == 0);
 42 }
 43 
 44 static void fill_fullpaths(struct node *tree, const char *prefix)
 45 {
 46         struct node *child;
 47         const char *unit;
 48 
 49         tree->fullpath = join_path(prefix, tree->name);
 50 
 51         unit = strchr(tree->name, '@');
 52         if (unit)
 53                 tree->basenamelen = unit - tree->name;
 54         else
 55                 tree->basenamelen = strlen(tree->name);
 56 
 57         for_each_child(tree, child)
 58                 fill_fullpaths(child, tree->fullpath);
 59 }
 60 
 61 /* Usage related data. */
 62 static const char usage_synopsis[] = "dtc [options] <input file>";
 63 static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:a:fb:i:H:sW:E:@Ahv";
 64 static struct option const usage_long_opts[] = {
 65         {"quiet",            no_argument, NULL, 'q'},
 66         {"in-format",         a_argument, NULL, 'I'},
 67         {"out",               a_argument, NULL, 'o'},
 68         {"out-format",        a_argument, NULL, 'O'},
 69         {"out-version",       a_argument, NULL, 'V'},
 70         {"out-dependency",    a_argument, NULL, 'd'},
 71         {"reserve",           a_argument, NULL, 'R'},
 72         {"space",             a_argument, NULL, 'S'},
 73         {"pad",               a_argument, NULL, 'p'},
 74         {"align",             a_argument, NULL, 'a'},
 75         {"boot-cpu",          a_argument, NULL, 'b'},
 76         {"force",            no_argument, NULL, 'f'},
 77         {"include",           a_argument, NULL, 'i'},
 78         {"sort",             no_argument, NULL, 's'},
 79         {"phandle",           a_argument, NULL, 'H'},
 80         {"warning",           a_argument, NULL, 'W'},
 81         {"error",             a_argument, NULL, 'E'},
 82         {"symbols",          no_argument, NULL, '@'},
 83         {"auto-alias",       no_argument, NULL, 'A'},
 84         {"help",             no_argument, NULL, 'h'},
 85         {"version",          no_argument, NULL, 'v'},
 86         {NULL,               no_argument, NULL, 0x0},
 87 };
 88 static const char * const usage_opts_help[] = {
 89         "\n\tQuiet: -q suppress warnings, -qq errors, -qqq all",
 90         "\n\tInput formats are:\n"
 91          "\t\tdts - device tree source text\n"
 92          "\t\tdtb - device tree blob\n"
 93          "\t\tfs  - /proc/device-tree style directory",
 94         "\n\tOutput file",
 95         "\n\tOutput formats are:\n"
 96          "\t\tdts - device tree source text\n"
 97          "\t\tdtb - device tree blob\n"
 98          "\t\tasm - assembler source",
 99         "\n\tBlob version to produce, defaults to "stringify(DEFAULT_FDT_VERSION)" (for dtb and asm output)",
100         "\n\tOutput dependency file",
101         "\n\tMake space for <number> reserve map entries (for dtb and asm output)",
102         "\n\tMake the blob at least <bytes> long (extra space)",
103         "\n\tAdd padding to the blob of <bytes> long (extra space)",
104         "\n\tMake the blob align to the <bytes> (extra space)",
105         "\n\tSet the physical boot cpu",
106         "\n\tTry to produce output even if the input tree has errors",
107         "\n\tAdd a path to search for include files",
108         "\n\tSort nodes and properties before outputting (useful for comparing trees)",
109         "\n\tValid phandle formats are:\n"
110          "\t\tlegacy - \"linux,phandle\" properties only\n"
111          "\t\tepapr  - \"phandle\" properties only\n"
112          "\t\tboth   - Both \"linux,phandle\" and \"phandle\" properties",
113         "\n\tEnable/disable warnings (prefix with \"no-\")",
114         "\n\tEnable/disable errors (prefix with \"no-\")",
115         "\n\tEnable generation of symbols",
116         "\n\tEnable auto-alias of labels",
117         "\n\tPrint this help and exit",
118         "\n\tPrint version and exit",
119         NULL,
120 };
121 
122 static const char *guess_type_by_name(const char *fname, const char *fallback)
123 {
124         const char *s;
125 
126         s = strrchr(fname, '.');
127         if (s == NULL)
128                 return fallback;
129         if (!strcasecmp(s, ".dts"))
130                 return "dts";
131         if (!strcasecmp(s, ".dtb"))
132                 return "dtb";
133         return fallback;
134 }
135 
136 static const char *guess_input_format(const char *fname, const char *fallback)
137 {
138         struct stat statbuf;
139         fdt32_t magic;
140         FILE *f;
141 
142         if (stat(fname, &statbuf) != 0)
143                 return fallback;
144 
145         if (S_ISDIR(statbuf.st_mode))
146                 return "fs";
147 
148         if (!S_ISREG(statbuf.st_mode))
149                 return fallback;
150 
151         f = fopen(fname, "r");
152         if (f == NULL)
153                 return fallback;
154         if (fread(&magic, 4, 1, f) != 1) {
155                 fclose(f);
156                 return fallback;
157         }
158         fclose(f);
159 
160         if (fdt32_to_cpu(magic) == FDT_MAGIC)
161                 return "dtb";
162 
163         return guess_type_by_name(fname, fallback);
164 }
165 
166 int main(int argc, char *argv[])
167 {
168         struct dt_info *dti;
169         const char *inform = NULL;
170         const char *outform = NULL;
171         const char *outname = "-";
172         const char *depname = NULL;
173         bool force = false, sort = false;
174         const char *arg;
175         int opt;
176         FILE *outf = NULL;
177         int outversion = DEFAULT_FDT_VERSION;
178         long long cmdline_boot_cpuid = -1;
179 
180         quiet      = 0;
181         reservenum = 0;
182         minsize    = 0;
183         padsize    = 0;
184         alignsize  = 0;
185 
186         while ((opt = util_getopt_long()) != EOF) {
187                 switch (opt) {
188                 case 'I':
189                         inform = optarg;
190                         break;
191                 case 'O':
192                         outform = optarg;
193                         break;
194                 case 'o':
195                         outname = optarg;
196                         break;
197                 case 'V':
198                         outversion = strtol(optarg, NULL, 0);
199                         break;
200                 case 'd':
201                         depname = optarg;
202                         break;
203                 case 'R':
204                         reservenum = strtol(optarg, NULL, 0);
205                         break;
206                 case 'S':
207                         minsize = strtol(optarg, NULL, 0);
208                         break;
209                 case 'p':
210                         padsize = strtol(optarg, NULL, 0);
211                         break;
212                 case 'a':
213                         alignsize = strtol(optarg, NULL, 0);
214                         if (!is_power_of_2(alignsize))
215                                 die("Invalid argument \"%d\" to -a option\n",
216                                     alignsize);
217                         break;
218                 case 'f':
219                         force = true;
220                         break;
221                 case 'q':
222                         quiet++;
223                         break;
224                 case 'b':
225                         cmdline_boot_cpuid = strtoll(optarg, NULL, 0);
226                         break;
227                 case 'i':
228                         srcfile_add_search_path(optarg);
229                         break;
230                 case 'v':
231                         util_version();
232                 case 'H':
233                         if (streq(optarg, "legacy"))
234                                 phandle_format = PHANDLE_LEGACY;
235                         else if (streq(optarg, "epapr"))
236                                 phandle_format = PHANDLE_EPAPR;
237                         else if (streq(optarg, "both"))
238                                 phandle_format = PHANDLE_BOTH;
239                         else
240                                 die("Invalid argument \"%s\" to -H option\n",
241                                     optarg);
242                         break;
243 
244                 case 's':
245                         sort = true;
246                         break;
247 
248                 case 'W':
249                         parse_checks_option(true, false, optarg);
250                         break;
251 
252                 case 'E':
253                         parse_checks_option(false, true, optarg);
254                         break;
255 
256                 case '@':
257                         generate_symbols = 1;
258                         break;
259                 case 'A':
260                         auto_label_aliases = 1;
261                         break;
262 
263                 case 'h':
264                         usage(NULL);
265                 default:
266                         usage("unknown option");
267                 }
268         }
269 
270         if (argc > (optind+1))
271                 usage("missing files");
272         else if (argc < (optind+1))
273                 arg = "-";
274         else
275                 arg = argv[optind];
276 
277         /* minsize and padsize are mutually exclusive */
278         if (minsize && padsize)
279                 die("Can't set both -p and -S\n");
280 
281         if (depname) {
282                 depfile = fopen(depname, "w");
283                 if (!depfile)
284                         die("Couldn't open dependency file %s: %s\n", depname,
285                             strerror(errno));
286                 fprintf(depfile, "%s:", outname);
287         }
288 
289         if (inform == NULL)
290                 inform = guess_input_format(arg, "dts");
291         if (outform == NULL) {
292                 outform = guess_type_by_name(outname, NULL);
293                 if (outform == NULL) {
294                         if (streq(inform, "dts"))
295                                 outform = "dtb";
296                         else
297                                 outform = "dts";
298                 }
299         }
300         if (streq(inform, "dts"))
301                 dti = dt_from_source(arg);
302         else if (streq(inform, "fs"))
303                 dti = dt_from_fs(arg);
304         else if(streq(inform, "dtb"))
305                 dti = dt_from_blob(arg);
306         else
307                 die("Unknown input format \"%s\"\n", inform);
308 
309         dti->outname = outname;
310 
311         if (depfile) {
312                 fputc('\n', depfile);
313                 fclose(depfile);
314         }
315 
316         if (cmdline_boot_cpuid != -1)
317                 dti->boot_cpuid_phys = cmdline_boot_cpuid;
318 
319         fill_fullpaths(dti->dt, "");
320 
321         /* on a plugin, generate by default */
322         if (dti->dtsflags & DTSF_PLUGIN) {
323                 generate_fixups = 1;
324         }
325 
326         process_checks(force, dti);
327 
328         if (auto_label_aliases)
329                 generate_label_tree(dti, "aliases", false);
330 
331         if (generate_symbols)
332                 generate_label_tree(dti, "__symbols__", true);
333 
334         if (generate_fixups) {
335                 generate_fixups_tree(dti, "__fixups__");
336                 generate_local_fixups_tree(dti, "__local_fixups__");
337         }
338 
339         if (sort)
340                 sort_tree(dti);
341 
342         if (streq(outname, "-")) {
343                 outf = stdout;
344         } else {
345                 outf = fopen(outname, "wb");
346                 if (! outf)
347                         die("Couldn't open output file %s: %s\n",
348                             outname, strerror(errno));
349         }
350 
351         if (streq(outform, "dts")) {
352                 dt_to_source(outf, dti);
353         } else if (streq(outform, "dtb")) {
354                 dt_to_blob(outf, dti, outversion);
355         } else if (streq(outform, "asm")) {
356                 dt_to_asm(outf, dti, outversion);
357         } else if (streq(outform, "null")) {
358                 /* do nothing */
359         } else {
360                 die("Unknown output format \"%s\"\n", outform);
361         }
362 
363         exit(0);
364 }
365 

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