Commit 06283a6401f652e709b7b27d02238d0c6f92cb0c
Committed by
Wolfgang Denk
1 parent
e11938eabc
Exists in
master
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Add pxe command
Add pxe command, which is intended to mimic PXELINUX functionality. 'pxe get' uses tftp to retrieve a file based on UUID, MAC address or IP address. 'pxe boot' interprets the contents of PXELINUX config like file to boot using a specific initrd, kernel and kernel command line. This patch also adds a README.pxe file - see it for more details on the pxe command. Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>
Showing 5 changed files with 1604 additions and 0 deletions Side-by-side Diff
common/Makefile
... | ... | @@ -136,6 +136,7 @@ |
136 | 136 | endif |
137 | 137 | COBJS-y += cmd_pcmcia.o |
138 | 138 | COBJS-$(CONFIG_CMD_PORTIO) += cmd_portio.o |
139 | +COBJS-$(CONFIG_CMD_PXE) += cmd_pxe.o | |
139 | 140 | COBJS-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o |
140 | 141 | COBJS-$(CONFIG_CMD_REISER) += cmd_reiser.o |
141 | 142 | COBJS-$(CONFIG_CMD_SATA) += cmd_sata.o |
common/cmd_pxe.c
Changes suppressed. Click to show
1 | +/* | |
2 | + * Copyright 2010-2011 Calxeda, Inc. | |
3 | + * | |
4 | + * This program is free software; you can redistribute it and/or modify it | |
5 | + * under the terms of the GNU General Public License as published by the Free | |
6 | + * Software Foundation; either version 2 of the License, or (at your option) | |
7 | + * any later version. | |
8 | + * | |
9 | + * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | + * more details. | |
13 | + * | |
14 | + * You should have received a copy of the GNU General Public License along with | |
15 | + * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | + */ | |
17 | +#include <common.h> | |
18 | +#include <command.h> | |
19 | +#include <malloc.h> | |
20 | +#include <linux/string.h> | |
21 | +#include <linux/ctype.h> | |
22 | +#include <errno.h> | |
23 | +#include <linux/list.h> | |
24 | + | |
25 | +#include "menu.h" | |
26 | + | |
27 | +#define MAX_TFTP_PATH_LEN 127 | |
28 | + | |
29 | + | |
30 | +/* | |
31 | + * Like getenv, but prints an error if envvar isn't defined in the | |
32 | + * environment. It always returns what getenv does, so it can be used in | |
33 | + * place of getenv without changing error handling otherwise. | |
34 | + */ | |
35 | +static char *from_env(char *envvar) | |
36 | +{ | |
37 | + char *ret; | |
38 | + | |
39 | + ret = getenv(envvar); | |
40 | + | |
41 | + if (!ret) | |
42 | + printf("missing environment variable: %s\n", envvar); | |
43 | + | |
44 | + return ret; | |
45 | +} | |
46 | + | |
47 | +/* | |
48 | + * Convert an ethaddr from the environment to the format used by pxelinux | |
49 | + * filenames based on mac addresses. Convert's ':' to '-', and adds "01-" to | |
50 | + * the beginning of the ethernet address to indicate a hardware type of | |
51 | + * Ethernet. Also converts uppercase hex characters into lowercase, to match | |
52 | + * pxelinux's behavior. | |
53 | + * | |
54 | + * Returns 1 for success, -ENOENT if 'ethaddr' is undefined in the | |
55 | + * environment, or some other value < 0 on error. | |
56 | + */ | |
57 | +static int format_mac_pxe(char *outbuf, size_t outbuf_len) | |
58 | +{ | |
59 | + size_t ethaddr_len; | |
60 | + char *p, *ethaddr; | |
61 | + | |
62 | + ethaddr = from_env("ethaddr"); | |
63 | + | |
64 | + if (!ethaddr) | |
65 | + return -ENOENT; | |
66 | + | |
67 | + ethaddr_len = strlen(ethaddr); | |
68 | + | |
69 | + /* | |
70 | + * ethaddr_len + 4 gives room for "01-", ethaddr, and a NUL byte at | |
71 | + * the end. | |
72 | + */ | |
73 | + if (outbuf_len < ethaddr_len + 4) { | |
74 | + printf("outbuf is too small (%d < %d)\n", | |
75 | + outbuf_len, ethaddr_len + 4); | |
76 | + | |
77 | + return -EINVAL; | |
78 | + } | |
79 | + | |
80 | + strcpy(outbuf, "01-"); | |
81 | + | |
82 | + for (p = outbuf + 3; *ethaddr; ethaddr++, p++) { | |
83 | + if (*ethaddr == ':') | |
84 | + *p = '-'; | |
85 | + else | |
86 | + *p = tolower(*ethaddr); | |
87 | + } | |
88 | + | |
89 | + *p = '\0'; | |
90 | + | |
91 | + return 1; | |
92 | +} | |
93 | + | |
94 | +/* | |
95 | + * Returns the directory the file specified in the bootfile env variable is | |
96 | + * in. If bootfile isn't defined in the environment, return NULL, which should | |
97 | + * be interpreted as "don't prepend anything to paths". | |
98 | + */ | |
99 | +static int get_bootfile_path(char *bootfile_path, size_t bootfile_path_size) | |
100 | +{ | |
101 | + char *bootfile, *last_slash; | |
102 | + size_t path_len; | |
103 | + | |
104 | + bootfile = from_env("bootfile"); | |
105 | + | |
106 | + if (!bootfile) { | |
107 | + bootfile_path[0] = '\0'; | |
108 | + return 1; | |
109 | + } | |
110 | + | |
111 | + last_slash = strrchr(bootfile, '/'); | |
112 | + | |
113 | + if (last_slash == NULL) { | |
114 | + bootfile_path[0] = '\0'; | |
115 | + return 1; | |
116 | + } | |
117 | + | |
118 | + path_len = (last_slash - bootfile) + 1; | |
119 | + | |
120 | + if (bootfile_path_size < path_len) { | |
121 | + printf("bootfile_path too small. (%d < %d)\n", | |
122 | + bootfile_path_size, path_len); | |
123 | + | |
124 | + return -1; | |
125 | + } | |
126 | + | |
127 | + strncpy(bootfile_path, bootfile, path_len); | |
128 | + | |
129 | + bootfile_path[path_len] = '\0'; | |
130 | + | |
131 | + return 1; | |
132 | +} | |
133 | + | |
134 | +/* | |
135 | + * As in pxelinux, paths to files referenced from files we retrieve are | |
136 | + * relative to the location of bootfile. get_relfile takes such a path and | |
137 | + * joins it with the bootfile path to get the full path to the target file. If | |
138 | + * the bootfile path is NULL, we use file_path as is. | |
139 | + * | |
140 | + * Returns 1 for success, or < 0 on error. | |
141 | + */ | |
142 | +static int get_relfile(char *file_path, void *file_addr) | |
143 | +{ | |
144 | + size_t path_len; | |
145 | + char relfile[MAX_TFTP_PATH_LEN+1]; | |
146 | + char addr_buf[10]; | |
147 | + char *tftp_argv[] = {"tftp", NULL, NULL, NULL}; | |
148 | + int err; | |
149 | + | |
150 | + err = get_bootfile_path(relfile, sizeof(relfile)); | |
151 | + | |
152 | + if (err < 0) | |
153 | + return err; | |
154 | + | |
155 | + path_len = strlen(file_path); | |
156 | + path_len += strlen(relfile); | |
157 | + | |
158 | + if (path_len > MAX_TFTP_PATH_LEN) { | |
159 | + printf("Base path too long (%s%s)\n", | |
160 | + relfile, | |
161 | + file_path); | |
162 | + | |
163 | + return -ENAMETOOLONG; | |
164 | + } | |
165 | + | |
166 | + strcat(relfile, file_path); | |
167 | + | |
168 | + printf("Retrieving file: %s\n", relfile); | |
169 | + | |
170 | + sprintf(addr_buf, "%p", file_addr); | |
171 | + | |
172 | + tftp_argv[1] = addr_buf; | |
173 | + tftp_argv[2] = relfile; | |
174 | + | |
175 | + if (do_tftpb(NULL, 0, 3, tftp_argv)) | |
176 | + return -ENOENT; | |
177 | + | |
178 | + return 1; | |
179 | +} | |
180 | + | |
181 | +/* | |
182 | + * Retrieve the file at 'file_path' to the locate given by 'file_addr'. If | |
183 | + * 'bootfile' was specified in the environment, the path to bootfile will be | |
184 | + * prepended to 'file_path' and the resulting path will be used. | |
185 | + * | |
186 | + * Returns 1 on success, or < 0 for error. | |
187 | + */ | |
188 | +static int get_pxe_file(char *file_path, void *file_addr) | |
189 | +{ | |
190 | + unsigned long config_file_size; | |
191 | + char *tftp_filesize; | |
192 | + int err; | |
193 | + | |
194 | + err = get_relfile(file_path, file_addr); | |
195 | + | |
196 | + if (err < 0) | |
197 | + return err; | |
198 | + | |
199 | + /* | |
200 | + * the file comes without a NUL byte at the end, so find out its size | |
201 | + * and add the NUL byte. | |
202 | + */ | |
203 | + tftp_filesize = from_env("filesize"); | |
204 | + | |
205 | + if (!tftp_filesize) | |
206 | + return -ENOENT; | |
207 | + | |
208 | + if (strict_strtoul(tftp_filesize, 16, &config_file_size) < 0) | |
209 | + return -EINVAL; | |
210 | + | |
211 | + *(char *)(file_addr + config_file_size) = '\0'; | |
212 | + | |
213 | + return 1; | |
214 | +} | |
215 | + | |
216 | +#define PXELINUX_DIR "pxelinux.cfg/" | |
217 | + | |
218 | +/* | |
219 | + * Retrieves a file in the 'pxelinux.cfg' folder. Since this uses get_pxe_file | |
220 | + * to do the hard work, the location of the 'pxelinux.cfg' folder is generated | |
221 | + * from the bootfile path, as described above. | |
222 | + * | |
223 | + * Returns 1 on success or < 0 on error. | |
224 | + */ | |
225 | +static int get_pxelinux_path(char *file, void *pxefile_addr_r) | |
226 | +{ | |
227 | + size_t base_len = strlen(PXELINUX_DIR); | |
228 | + char path[MAX_TFTP_PATH_LEN+1]; | |
229 | + | |
230 | + if (base_len + strlen(file) > MAX_TFTP_PATH_LEN) { | |
231 | + printf("path (%s%s) too long, skipping\n", | |
232 | + PXELINUX_DIR, file); | |
233 | + return -ENAMETOOLONG; | |
234 | + } | |
235 | + | |
236 | + sprintf(path, PXELINUX_DIR "%s", file); | |
237 | + | |
238 | + return get_pxe_file(path, pxefile_addr_r); | |
239 | +} | |
240 | + | |
241 | +/* | |
242 | + * Looks for a pxe file with a name based on the pxeuuid environment variable. | |
243 | + * | |
244 | + * Returns 1 on success or < 0 on error. | |
245 | + */ | |
246 | +static int pxe_uuid_path(void *pxefile_addr_r) | |
247 | +{ | |
248 | + char *uuid_str; | |
249 | + | |
250 | + uuid_str = from_env("pxeuuid"); | |
251 | + | |
252 | + if (!uuid_str) | |
253 | + return -ENOENT; | |
254 | + | |
255 | + return get_pxelinux_path(uuid_str, pxefile_addr_r); | |
256 | +} | |
257 | + | |
258 | +/* | |
259 | + * Looks for a pxe file with a name based on the 'ethaddr' environment | |
260 | + * variable. | |
261 | + * | |
262 | + * Returns 1 on success or < 0 on error. | |
263 | + */ | |
264 | +static int pxe_mac_path(void *pxefile_addr_r) | |
265 | +{ | |
266 | + char mac_str[21]; | |
267 | + int err; | |
268 | + | |
269 | + err = format_mac_pxe(mac_str, sizeof(mac_str)); | |
270 | + | |
271 | + if (err < 0) | |
272 | + return err; | |
273 | + | |
274 | + return get_pxelinux_path(mac_str, pxefile_addr_r); | |
275 | +} | |
276 | + | |
277 | +/* | |
278 | + * Looks for pxe files with names based on our IP address. See pxelinux | |
279 | + * documentation for details on what these file names look like. We match | |
280 | + * that exactly. | |
281 | + * | |
282 | + * Returns 1 on success or < 0 on error. | |
283 | + */ | |
284 | +static int pxe_ipaddr_paths(void *pxefile_addr_r) | |
285 | +{ | |
286 | + char ip_addr[9]; | |
287 | + int mask_pos, err; | |
288 | + | |
289 | + sprintf(ip_addr, "%08X", ntohl(NetOurIP)); | |
290 | + | |
291 | + for (mask_pos = 7; mask_pos >= 0; mask_pos--) { | |
292 | + err = get_pxelinux_path(ip_addr, pxefile_addr_r); | |
293 | + | |
294 | + if (err > 0) | |
295 | + return err; | |
296 | + | |
297 | + ip_addr[mask_pos] = '\0'; | |
298 | + } | |
299 | + | |
300 | + return -ENOENT; | |
301 | +} | |
302 | + | |
303 | +/* | |
304 | + * Entry point for the 'pxe get' command. | |
305 | + * This Follows pxelinux's rules to download a config file from a tftp server. | |
306 | + * The file is stored at the location given by the pxefile_addr_r environment | |
307 | + * variable, which must be set. | |
308 | + * | |
309 | + * UUID comes from pxeuuid env variable, if defined | |
310 | + * MAC addr comes from ethaddr env variable, if defined | |
311 | + * IP | |
312 | + * | |
313 | + * see http://syslinux.zytor.com/wiki/index.php/PXELINUX | |
314 | + * | |
315 | + * Returns 0 on success or 1 on error. | |
316 | + */ | |
317 | +static int | |
318 | +do_pxe_get(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) | |
319 | +{ | |
320 | + char *pxefile_addr_str; | |
321 | + void *pxefile_addr_r; | |
322 | + int err; | |
323 | + | |
324 | + if (argc != 1) | |
325 | + return cmd_usage(cmdtp); | |
326 | + | |
327 | + | |
328 | + pxefile_addr_str = from_env("pxefile_addr_r"); | |
329 | + | |
330 | + if (!pxefile_addr_str) | |
331 | + return 1; | |
332 | + | |
333 | + err = strict_strtoul(pxefile_addr_str, 16, | |
334 | + (unsigned long *)&pxefile_addr_r); | |
335 | + if (err < 0) | |
336 | + return 1; | |
337 | + | |
338 | + /* | |
339 | + * Keep trying paths until we successfully get a file we're looking | |
340 | + * for. | |
341 | + */ | |
342 | + if (pxe_uuid_path(pxefile_addr_r) > 0 | |
343 | + || pxe_mac_path(pxefile_addr_r) > 0 | |
344 | + || pxe_ipaddr_paths(pxefile_addr_r) > 0 | |
345 | + || get_pxelinux_path("default", pxefile_addr_r) > 0) { | |
346 | + | |
347 | + printf("Config file found\n"); | |
348 | + | |
349 | + return 0; | |
350 | + } | |
351 | + | |
352 | + printf("Config file not found\n"); | |
353 | + | |
354 | + return 1; | |
355 | +} | |
356 | + | |
357 | +/* | |
358 | + * Wrapper to make it easier to store the file at file_path in the location | |
359 | + * specified by envaddr_name. file_path will be joined to the bootfile path, | |
360 | + * if any is specified. | |
361 | + * | |
362 | + * Returns 1 on success or < 0 on error. | |
363 | + */ | |
364 | +static int get_relfile_envaddr(char *file_path, char *envaddr_name) | |
365 | +{ | |
366 | + void *file_addr; | |
367 | + char *envaddr; | |
368 | + | |
369 | + envaddr = from_env(envaddr_name); | |
370 | + | |
371 | + if (!envaddr) | |
372 | + return -ENOENT; | |
373 | + | |
374 | + if (strict_strtoul(envaddr, 16, (unsigned long *)&file_addr) < 0) | |
375 | + return -EINVAL; | |
376 | + | |
377 | + return get_relfile(file_path, file_addr); | |
378 | +} | |
379 | + | |
380 | +/* | |
381 | + * A note on the pxe file parser. | |
382 | + * | |
383 | + * We're parsing files that use syslinux grammar, which has a few quirks. | |
384 | + * String literals must be recognized based on context - there is no | |
385 | + * quoting or escaping support. There's also nothing to explicitly indicate | |
386 | + * when a label section completes. We deal with that by ending a label | |
387 | + * section whenever we see a line that doesn't include. | |
388 | + * | |
389 | + * As with the syslinux family, this same file format could be reused in the | |
390 | + * future for non pxe purposes. The only action it takes during parsing that | |
391 | + * would throw this off is handling of include files. It assumes we're using | |
392 | + * pxe, and does a tftp download of a file listed as an include file in the | |
393 | + * middle of the parsing operation. That could be handled by refactoring it to | |
394 | + * take a 'include file getter' function. | |
395 | + */ | |
396 | + | |
397 | +/* | |
398 | + * Describes a single label given in a pxe file. | |
399 | + * | |
400 | + * Create these with the 'label_create' function given below. | |
401 | + * | |
402 | + * name - the name of the menu as given on the 'menu label' line. | |
403 | + * kernel - the path to the kernel file to use for this label. | |
404 | + * append - kernel command line to use when booting this label | |
405 | + * initrd - path to the initrd to use for this label. | |
406 | + * attempted - 0 if we haven't tried to boot this label, 1 if we have. | |
407 | + * localboot - 1 if this label specified 'localboot', 0 otherwise. | |
408 | + * list - lets these form a list, which a pxe_menu struct will hold. | |
409 | + */ | |
410 | +struct pxe_label { | |
411 | + char *name; | |
412 | + char *kernel; | |
413 | + char *append; | |
414 | + char *initrd; | |
415 | + int attempted; | |
416 | + int localboot; | |
417 | + struct list_head list; | |
418 | +}; | |
419 | + | |
420 | +/* | |
421 | + * Describes a pxe menu as given via pxe files. | |
422 | + * | |
423 | + * title - the name of the menu as given by a 'menu title' line. | |
424 | + * default_label - the name of the default label, if any. | |
425 | + * timeout - time in tenths of a second to wait for a user key-press before | |
426 | + * booting the default label. | |
427 | + * prompt - if 0, don't prompt for a choice unless the timeout period is | |
428 | + * interrupted. If 1, always prompt for a choice regardless of | |
429 | + * timeout. | |
430 | + * labels - a list of labels defined for the menu. | |
431 | + */ | |
432 | +struct pxe_menu { | |
433 | + char *title; | |
434 | + char *default_label; | |
435 | + int timeout; | |
436 | + int prompt; | |
437 | + struct list_head labels; | |
438 | +}; | |
439 | + | |
440 | +/* | |
441 | + * Allocates memory for and initializes a pxe_label. This uses malloc, so the | |
442 | + * result must be free()'d to reclaim the memory. | |
443 | + * | |
444 | + * Returns NULL if malloc fails. | |
445 | + */ | |
446 | +static struct pxe_label *label_create(void) | |
447 | +{ | |
448 | + struct pxe_label *label; | |
449 | + | |
450 | + label = malloc(sizeof(struct pxe_label)); | |
451 | + | |
452 | + if (!label) | |
453 | + return NULL; | |
454 | + | |
455 | + memset(label, 0, sizeof(struct pxe_label)); | |
456 | + | |
457 | + return label; | |
458 | +} | |
459 | + | |
460 | +/* | |
461 | + * Free the memory used by a pxe_label, including that used by its name, | |
462 | + * kernel, append and initrd members, if they're non NULL. | |
463 | + * | |
464 | + * So - be sure to only use dynamically allocated memory for the members of | |
465 | + * the pxe_label struct, unless you want to clean it up first. These are | |
466 | + * currently only created by the pxe file parsing code. | |
467 | + */ | |
468 | +static void label_destroy(struct pxe_label *label) | |
469 | +{ | |
470 | + if (label->name) | |
471 | + free(label->name); | |
472 | + | |
473 | + if (label->kernel) | |
474 | + free(label->kernel); | |
475 | + | |
476 | + if (label->append) | |
477 | + free(label->append); | |
478 | + | |
479 | + if (label->initrd) | |
480 | + free(label->initrd); | |
481 | + | |
482 | + free(label); | |
483 | +} | |
484 | + | |
485 | +/* | |
486 | + * Print a label and its string members if they're defined. | |
487 | + * | |
488 | + * This is passed as a callback to the menu code for displaying each | |
489 | + * menu entry. | |
490 | + */ | |
491 | +static void label_print(void *data) | |
492 | +{ | |
493 | + struct pxe_label *label = data; | |
494 | + | |
495 | + printf("Label: %s\n", label->name); | |
496 | + | |
497 | + if (label->kernel) | |
498 | + printf("\tkernel: %s\n", label->kernel); | |
499 | + | |
500 | + if (label->append) | |
501 | + printf("\tappend: %s\n", label->append); | |
502 | + | |
503 | + if (label->initrd) | |
504 | + printf("\tinitrd: %s\n", label->initrd); | |
505 | +} | |
506 | + | |
507 | +/* | |
508 | + * Boot a label that specified 'localboot'. This requires that the 'localcmd' | |
509 | + * environment variable is defined. Its contents will be executed as U-boot | |
510 | + * command. If the label specified an 'append' line, its contents will be | |
511 | + * used to overwrite the contents of the 'bootargs' environment variable prior | |
512 | + * to running 'localcmd'. | |
513 | + * | |
514 | + * Returns 1 on success or < 0 on error. | |
515 | + */ | |
516 | +static int label_localboot(struct pxe_label *label) | |
517 | +{ | |
518 | + char *localcmd, *dupcmd; | |
519 | + int ret; | |
520 | + | |
521 | + localcmd = from_env("localcmd"); | |
522 | + | |
523 | + if (!localcmd) | |
524 | + return -ENOENT; | |
525 | + | |
526 | + /* | |
527 | + * dup the command to avoid any issues with the version of it existing | |
528 | + * in the environment changing during the execution of the command. | |
529 | + */ | |
530 | + dupcmd = strdup(localcmd); | |
531 | + | |
532 | + if (!dupcmd) | |
533 | + return -ENOMEM; | |
534 | + | |
535 | + if (label->append) | |
536 | + setenv("bootargs", label->append); | |
537 | + | |
538 | + printf("running: %s\n", dupcmd); | |
539 | + | |
540 | + ret = run_command2(dupcmd, 0); | |
541 | + | |
542 | + free(dupcmd); | |
543 | + | |
544 | + return ret; | |
545 | +} | |
546 | + | |
547 | +/* | |
548 | + * Boot according to the contents of a pxe_label. | |
549 | + * | |
550 | + * If we can't boot for any reason, we return. A successful boot never | |
551 | + * returns. | |
552 | + * | |
553 | + * The kernel will be stored in the location given by the 'kernel_addr_r' | |
554 | + * environment variable. | |
555 | + * | |
556 | + * If the label specifies an initrd file, it will be stored in the location | |
557 | + * given by the 'ramdisk_addr_r' environment variable. | |
558 | + * | |
559 | + * If the label specifies an 'append' line, its contents will overwrite that | |
560 | + * of the 'bootargs' environment variable. | |
561 | + */ | |
562 | +static void label_boot(struct pxe_label *label) | |
563 | +{ | |
564 | + char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL }; | |
565 | + int bootm_argc = 3; | |
566 | + | |
567 | + label_print(label); | |
568 | + | |
569 | + label->attempted = 1; | |
570 | + | |
571 | + if (label->localboot) { | |
572 | + label_localboot(label); | |
573 | + return; | |
574 | + } | |
575 | + | |
576 | + if (label->kernel == NULL) { | |
577 | + printf("No kernel given, skipping %s\n", | |
578 | + label->name); | |
579 | + return; | |
580 | + } | |
581 | + | |
582 | + if (label->initrd) { | |
583 | + if (get_relfile_envaddr(label->initrd, "ramdisk_addr_r") < 0) { | |
584 | + printf("Skipping %s for failure retrieving initrd\n", | |
585 | + label->name); | |
586 | + return; | |
587 | + } | |
588 | + | |
589 | + bootm_argv[2] = getenv("ramdisk_addr_r"); | |
590 | + } else { | |
591 | + bootm_argv[2] = "-"; | |
592 | + } | |
593 | + | |
594 | + if (get_relfile_envaddr(label->kernel, "kernel_addr_r") < 0) { | |
595 | + printf("Skipping %s for failure retrieving kernel\n", | |
596 | + label->name); | |
597 | + return; | |
598 | + } | |
599 | + | |
600 | + if (label->append) | |
601 | + setenv("bootargs", label->append); | |
602 | + | |
603 | + bootm_argv[1] = getenv("kernel_addr_r"); | |
604 | + | |
605 | + /* | |
606 | + * fdt usage is optional. If there is an fdt_addr specified, we will | |
607 | + * pass it along to bootm, and adjust argc appropriately. | |
608 | + */ | |
609 | + bootm_argv[3] = getenv("fdt_addr"); | |
610 | + | |
611 | + if (bootm_argv[3]) | |
612 | + bootm_argc = 4; | |
613 | + | |
614 | + do_bootm(NULL, 0, bootm_argc, bootm_argv); | |
615 | +} | |
616 | + | |
617 | +/* | |
618 | + * Tokens for the pxe file parser. | |
619 | + */ | |
620 | +enum token_type { | |
621 | + T_EOL, | |
622 | + T_STRING, | |
623 | + T_EOF, | |
624 | + T_MENU, | |
625 | + T_TITLE, | |
626 | + T_TIMEOUT, | |
627 | + T_LABEL, | |
628 | + T_KERNEL, | |
629 | + T_APPEND, | |
630 | + T_INITRD, | |
631 | + T_LOCALBOOT, | |
632 | + T_DEFAULT, | |
633 | + T_PROMPT, | |
634 | + T_INCLUDE, | |
635 | + T_INVALID | |
636 | +}; | |
637 | + | |
638 | +/* | |
639 | + * A token - given by a value and a type. | |
640 | + */ | |
641 | +struct token { | |
642 | + char *val; | |
643 | + enum token_type type; | |
644 | +}; | |
645 | + | |
646 | +/* | |
647 | + * Keywords recognized. | |
648 | + */ | |
649 | +static const struct token keywords[] = { | |
650 | + {"menu", T_MENU}, | |
651 | + {"title", T_TITLE}, | |
652 | + {"timeout", T_TIMEOUT}, | |
653 | + {"default", T_DEFAULT}, | |
654 | + {"prompt", T_PROMPT}, | |
655 | + {"label", T_LABEL}, | |
656 | + {"kernel", T_KERNEL}, | |
657 | + {"localboot", T_LOCALBOOT}, | |
658 | + {"append", T_APPEND}, | |
659 | + {"initrd", T_INITRD}, | |
660 | + {"include", T_INCLUDE}, | |
661 | + {NULL, T_INVALID} | |
662 | +}; | |
663 | + | |
664 | +/* | |
665 | + * Since pxe(linux) files don't have a token to identify the start of a | |
666 | + * literal, we have to keep track of when we're in a state where a literal is | |
667 | + * expected vs when we're in a state a keyword is expected. | |
668 | + */ | |
669 | +enum lex_state { | |
670 | + L_NORMAL = 0, | |
671 | + L_KEYWORD, | |
672 | + L_SLITERAL | |
673 | +}; | |
674 | + | |
675 | +/* | |
676 | + * get_string retrieves a string from *p and stores it as a token in | |
677 | + * *t. | |
678 | + * | |
679 | + * get_string used for scanning both string literals and keywords. | |
680 | + * | |
681 | + * Characters from *p are copied into t-val until a character equal to | |
682 | + * delim is found, or a NUL byte is reached. If delim has the special value of | |
683 | + * ' ', any whitespace character will be used as a delimiter. | |
684 | + * | |
685 | + * If lower is unequal to 0, uppercase characters will be converted to | |
686 | + * lowercase in the result. This is useful to make keywords case | |
687 | + * insensitive. | |
688 | + * | |
689 | + * The location of *p is updated to point to the first character after the end | |
690 | + * of the token - the ending delimiter. | |
691 | + * | |
692 | + * On success, the new value of t->val is returned. Memory for t->val is | |
693 | + * allocated using malloc and must be free()'d to reclaim it. If insufficient | |
694 | + * memory is available, NULL is returned. | |
695 | + */ | |
696 | +static char *get_string(char **p, struct token *t, char delim, int lower) | |
697 | +{ | |
698 | + char *b, *e; | |
699 | + size_t len, i; | |
700 | + | |
701 | + /* | |
702 | + * b and e both start at the beginning of the input stream. | |
703 | + * | |
704 | + * e is incremented until we find the ending delimiter, or a NUL byte | |
705 | + * is reached. Then, we take e - b to find the length of the token. | |
706 | + */ | |
707 | + b = e = *p; | |
708 | + | |
709 | + while (*e) { | |
710 | + if ((delim == ' ' && isspace(*e)) || delim == *e) | |
711 | + break; | |
712 | + e++; | |
713 | + } | |
714 | + | |
715 | + len = e - b; | |
716 | + | |
717 | + /* | |
718 | + * Allocate memory to hold the string, and copy it in, converting | |
719 | + * characters to lowercase if lower is != 0. | |
720 | + */ | |
721 | + t->val = malloc(len + 1); | |
722 | + if (!t->val) | |
723 | + return NULL; | |
724 | + | |
725 | + for (i = 0; i < len; i++, b++) { | |
726 | + if (lower) | |
727 | + t->val[i] = tolower(*b); | |
728 | + else | |
729 | + t->val[i] = *b; | |
730 | + } | |
731 | + | |
732 | + t->val[len] = '\0'; | |
733 | + | |
734 | + /* | |
735 | + * Update *p so the caller knows where to continue scanning. | |
736 | + */ | |
737 | + *p = e; | |
738 | + | |
739 | + t->type = T_STRING; | |
740 | + | |
741 | + return t->val; | |
742 | +} | |
743 | + | |
744 | +/* | |
745 | + * Populate a keyword token with a type and value. | |
746 | + */ | |
747 | +static void get_keyword(struct token *t) | |
748 | +{ | |
749 | + int i; | |
750 | + | |
751 | + for (i = 0; keywords[i].val; i++) { | |
752 | + if (!strcmp(t->val, keywords[i].val)) { | |
753 | + t->type = keywords[i].type; | |
754 | + break; | |
755 | + } | |
756 | + } | |
757 | +} | |
758 | + | |
759 | +/* | |
760 | + * Get the next token. We have to keep track of which state we're in to know | |
761 | + * if we're looking to get a string literal or a keyword. | |
762 | + * | |
763 | + * *p is updated to point at the first character after the current token. | |
764 | + */ | |
765 | +static void get_token(char **p, struct token *t, enum lex_state state) | |
766 | +{ | |
767 | + char *c = *p; | |
768 | + | |
769 | + t->type = T_INVALID; | |
770 | + | |
771 | + /* eat non EOL whitespace */ | |
772 | + while (isblank(*c)) | |
773 | + c++; | |
774 | + | |
775 | + /* | |
776 | + * eat comments. note that string literals can't begin with #, but | |
777 | + * can contain a # after their first character. | |
778 | + */ | |
779 | + if (*c == '#') { | |
780 | + while (*c && *c != '\n') | |
781 | + c++; | |
782 | + } | |
783 | + | |
784 | + if (*c == '\n') { | |
785 | + t->type = T_EOL; | |
786 | + c++; | |
787 | + } else if (*c == '\0') { | |
788 | + t->type = T_EOF; | |
789 | + c++; | |
790 | + } else if (state == L_SLITERAL) { | |
791 | + get_string(&c, t, '\n', 0); | |
792 | + } else if (state == L_KEYWORD) { | |
793 | + /* | |
794 | + * when we expect a keyword, we first get the next string | |
795 | + * token delimited by whitespace, and then check if it | |
796 | + * matches a keyword in our keyword list. if it does, it's | |
797 | + * converted to a keyword token of the appropriate type, and | |
798 | + * if not, it remains a string token. | |
799 | + */ | |
800 | + get_string(&c, t, ' ', 1); | |
801 | + get_keyword(t); | |
802 | + } | |
803 | + | |
804 | + *p = c; | |
805 | +} | |
806 | + | |
807 | +/* | |
808 | + * Increment *c until we get to the end of the current line, or EOF. | |
809 | + */ | |
810 | +static void eol_or_eof(char **c) | |
811 | +{ | |
812 | + while (**c && **c != '\n') | |
813 | + (*c)++; | |
814 | +} | |
815 | + | |
816 | +/* | |
817 | + * All of these parse_* functions share some common behavior. | |
818 | + * | |
819 | + * They finish with *c pointing after the token they parse, and return 1 on | |
820 | + * success, or < 0 on error. | |
821 | + */ | |
822 | + | |
823 | +/* | |
824 | + * Parse a string literal and store a pointer it at *dst. String literals | |
825 | + * terminate at the end of the line. | |
826 | + */ | |
827 | +static int parse_sliteral(char **c, char **dst) | |
828 | +{ | |
829 | + struct token t; | |
830 | + char *s = *c; | |
831 | + | |
832 | + get_token(c, &t, L_SLITERAL); | |
833 | + | |
834 | + if (t.type != T_STRING) { | |
835 | + printf("Expected string literal: %.*s\n", (int)(*c - s), s); | |
836 | + return -EINVAL; | |
837 | + } | |
838 | + | |
839 | + *dst = t.val; | |
840 | + | |
841 | + return 1; | |
842 | +} | |
843 | + | |
844 | +/* | |
845 | + * Parse a base 10 (unsigned) integer and store it at *dst. | |
846 | + */ | |
847 | +static int parse_integer(char **c, int *dst) | |
848 | +{ | |
849 | + struct token t; | |
850 | + char *s = *c; | |
851 | + unsigned long temp; | |
852 | + | |
853 | + get_token(c, &t, L_SLITERAL); | |
854 | + | |
855 | + if (t.type != T_STRING) { | |
856 | + printf("Expected string: %.*s\n", (int)(*c - s), s); | |
857 | + return -EINVAL; | |
858 | + } | |
859 | + | |
860 | + if (strict_strtoul(t.val, 10, &temp) < 0) { | |
861 | + printf("Expected unsigned integer: %s\n", t.val); | |
862 | + return -EINVAL; | |
863 | + } | |
864 | + | |
865 | + *dst = (int)temp; | |
866 | + | |
867 | + free(t.val); | |
868 | + | |
869 | + return 1; | |
870 | +} | |
871 | + | |
872 | +static int parse_pxefile_top(char *p, struct pxe_menu *cfg, int nest_level); | |
873 | + | |
874 | +/* | |
875 | + * Parse an include statement, and retrieve and parse the file it mentions. | |
876 | + * | |
877 | + * base should point to a location where it's safe to store the file, and | |
878 | + * nest_level should indicate how many nested includes have occurred. For this | |
879 | + * include, nest_level has already been incremented and doesn't need to be | |
880 | + * incremented here. | |
881 | + */ | |
882 | +static int handle_include(char **c, char *base, | |
883 | + struct pxe_menu *cfg, int nest_level) | |
884 | +{ | |
885 | + char *include_path; | |
886 | + char *s = *c; | |
887 | + int err; | |
888 | + | |
889 | + err = parse_sliteral(c, &include_path); | |
890 | + | |
891 | + if (err < 0) { | |
892 | + printf("Expected include path: %.*s\n", | |
893 | + (int)(*c - s), s); | |
894 | + return err; | |
895 | + } | |
896 | + | |
897 | + err = get_pxe_file(include_path, base); | |
898 | + | |
899 | + if (err < 0) { | |
900 | + printf("Couldn't retrieve %s\n", include_path); | |
901 | + return err; | |
902 | + } | |
903 | + | |
904 | + return parse_pxefile_top(base, cfg, nest_level); | |
905 | +} | |
906 | + | |
907 | +/* | |
908 | + * Parse lines that begin with 'menu'. | |
909 | + * | |
910 | + * b and nest are provided to handle the 'menu include' case. | |
911 | + * | |
912 | + * b should be the address where the file currently being parsed is stored. | |
913 | + * | |
914 | + * nest_level should be 1 when parsing the top level pxe file, 2 when parsing | |
915 | + * a file it includes, 3 when parsing a file included by that file, and so on. | |
916 | + */ | |
917 | +static int parse_menu(char **c, struct pxe_menu *cfg, char *b, int nest_level) | |
918 | +{ | |
919 | + struct token t; | |
920 | + char *s = *c; | |
921 | + int err; | |
922 | + | |
923 | + get_token(c, &t, L_KEYWORD); | |
924 | + | |
925 | + switch (t.type) { | |
926 | + case T_TITLE: | |
927 | + err = parse_sliteral(c, &cfg->title); | |
928 | + | |
929 | + break; | |
930 | + | |
931 | + case T_INCLUDE: | |
932 | + err = handle_include(c, b + strlen(b) + 1, cfg, | |
933 | + nest_level + 1); | |
934 | + break; | |
935 | + | |
936 | + default: | |
937 | + printf("Ignoring malformed menu command: %.*s\n", | |
938 | + (int)(*c - s), s); | |
939 | + } | |
940 | + | |
941 | + if (err < 0) | |
942 | + return err; | |
943 | + | |
944 | + eol_or_eof(c); | |
945 | + | |
946 | + return 1; | |
947 | +} | |
948 | + | |
949 | +/* | |
950 | + * Handles parsing a 'menu line' when we're parsing a label. | |
951 | + */ | |
952 | +static int parse_label_menu(char **c, struct pxe_menu *cfg, | |
953 | + struct pxe_label *label) | |
954 | +{ | |
955 | + struct token t; | |
956 | + char *s; | |
957 | + | |
958 | + s = *c; | |
959 | + | |
960 | + get_token(c, &t, L_KEYWORD); | |
961 | + | |
962 | + switch (t.type) { | |
963 | + case T_DEFAULT: | |
964 | + if (cfg->default_label) | |
965 | + free(cfg->default_label); | |
966 | + | |
967 | + cfg->default_label = strdup(label->name); | |
968 | + | |
969 | + if (!cfg->default_label) | |
970 | + return -ENOMEM; | |
971 | + | |
972 | + break; | |
973 | + default: | |
974 | + printf("Ignoring malformed menu command: %.*s\n", | |
975 | + (int)(*c - s), s); | |
976 | + } | |
977 | + | |
978 | + eol_or_eof(c); | |
979 | + | |
980 | + return 0; | |
981 | +} | |
982 | + | |
983 | +/* | |
984 | + * Parses a label and adds it to the list of labels for a menu. | |
985 | + * | |
986 | + * A label ends when we either get to the end of a file, or | |
987 | + * get some input we otherwise don't have a handler defined | |
988 | + * for. | |
989 | + * | |
990 | + */ | |
991 | +static int parse_label(char **c, struct pxe_menu *cfg) | |
992 | +{ | |
993 | + struct token t; | |
994 | + char *s = *c; | |
995 | + struct pxe_label *label; | |
996 | + int err; | |
997 | + | |
998 | + label = label_create(); | |
999 | + if (!label) | |
1000 | + return -ENOMEM; | |
1001 | + | |
1002 | + err = parse_sliteral(c, &label->name); | |
1003 | + if (err < 0) { | |
1004 | + printf("Expected label name: %.*s\n", (int)(*c - s), s); | |
1005 | + label_destroy(label); | |
1006 | + return -EINVAL; | |
1007 | + } | |
1008 | + | |
1009 | + list_add_tail(&label->list, &cfg->labels); | |
1010 | + | |
1011 | + while (1) { | |
1012 | + s = *c; | |
1013 | + get_token(c, &t, L_KEYWORD); | |
1014 | + | |
1015 | + err = 0; | |
1016 | + switch (t.type) { | |
1017 | + case T_MENU: | |
1018 | + err = parse_label_menu(c, cfg, label); | |
1019 | + break; | |
1020 | + | |
1021 | + case T_KERNEL: | |
1022 | + err = parse_sliteral(c, &label->kernel); | |
1023 | + break; | |
1024 | + | |
1025 | + case T_APPEND: | |
1026 | + err = parse_sliteral(c, &label->append); | |
1027 | + break; | |
1028 | + | |
1029 | + case T_INITRD: | |
1030 | + err = parse_sliteral(c, &label->initrd); | |
1031 | + break; | |
1032 | + | |
1033 | + case T_LOCALBOOT: | |
1034 | + err = parse_integer(c, &label->localboot); | |
1035 | + break; | |
1036 | + | |
1037 | + case T_EOL: | |
1038 | + break; | |
1039 | + | |
1040 | + default: | |
1041 | + /* | |
1042 | + * put the token back! we don't want it - it's the end | |
1043 | + * of a label and whatever token this is, it's | |
1044 | + * something for the menu level context to handle. | |
1045 | + */ | |
1046 | + *c = s; | |
1047 | + return 1; | |
1048 | + } | |
1049 | + | |
1050 | + if (err < 0) | |
1051 | + return err; | |
1052 | + } | |
1053 | +} | |
1054 | + | |
1055 | +/* | |
1056 | + * This 16 comes from the limit pxelinux imposes on nested includes. | |
1057 | + * | |
1058 | + * There is no reason at all we couldn't do more, but some limit helps prevent | |
1059 | + * infinite (until crash occurs) recursion if a file tries to include itself. | |
1060 | + */ | |
1061 | +#define MAX_NEST_LEVEL 16 | |
1062 | + | |
1063 | +/* | |
1064 | + * Entry point for parsing a menu file. nest_level indicates how many times | |
1065 | + * we've nested in includes. It will be 1 for the top level menu file. | |
1066 | + * | |
1067 | + * Returns 1 on success, < 0 on error. | |
1068 | + */ | |
1069 | +static int parse_pxefile_top(char *p, struct pxe_menu *cfg, int nest_level) | |
1070 | +{ | |
1071 | + struct token t; | |
1072 | + char *s, *b, *label_name; | |
1073 | + int err; | |
1074 | + | |
1075 | + b = p; | |
1076 | + | |
1077 | + if (nest_level > MAX_NEST_LEVEL) { | |
1078 | + printf("Maximum nesting (%d) exceeded\n", MAX_NEST_LEVEL); | |
1079 | + return -EMLINK; | |
1080 | + } | |
1081 | + | |
1082 | + while (1) { | |
1083 | + s = p; | |
1084 | + | |
1085 | + get_token(&p, &t, L_KEYWORD); | |
1086 | + | |
1087 | + err = 0; | |
1088 | + switch (t.type) { | |
1089 | + case T_MENU: | |
1090 | + err = parse_menu(&p, cfg, b, nest_level); | |
1091 | + break; | |
1092 | + | |
1093 | + case T_TIMEOUT: | |
1094 | + err = parse_integer(&p, &cfg->timeout); | |
1095 | + break; | |
1096 | + | |
1097 | + case T_LABEL: | |
1098 | + err = parse_label(&p, cfg); | |
1099 | + break; | |
1100 | + | |
1101 | + case T_DEFAULT: | |
1102 | + err = parse_sliteral(&p, &label_name); | |
1103 | + | |
1104 | + if (label_name) { | |
1105 | + if (cfg->default_label) | |
1106 | + free(cfg->default_label); | |
1107 | + | |
1108 | + cfg->default_label = label_name; | |
1109 | + } | |
1110 | + | |
1111 | + break; | |
1112 | + | |
1113 | + case T_PROMPT: | |
1114 | + err = parse_integer(&p, &cfg->prompt); | |
1115 | + break; | |
1116 | + | |
1117 | + case T_EOL: | |
1118 | + break; | |
1119 | + | |
1120 | + case T_EOF: | |
1121 | + return 1; | |
1122 | + | |
1123 | + default: | |
1124 | + printf("Ignoring unknown command: %.*s\n", | |
1125 | + (int)(p - s), s); | |
1126 | + eol_or_eof(&p); | |
1127 | + } | |
1128 | + | |
1129 | + if (err < 0) | |
1130 | + return err; | |
1131 | + } | |
1132 | +} | |
1133 | + | |
1134 | +/* | |
1135 | + * Free the memory used by a pxe_menu and its labels. | |
1136 | + */ | |
1137 | +static void destroy_pxe_menu(struct pxe_menu *cfg) | |
1138 | +{ | |
1139 | + struct list_head *pos, *n; | |
1140 | + struct pxe_label *label; | |
1141 | + | |
1142 | + if (cfg->title) | |
1143 | + free(cfg->title); | |
1144 | + | |
1145 | + if (cfg->default_label) | |
1146 | + free(cfg->default_label); | |
1147 | + | |
1148 | + list_for_each_safe(pos, n, &cfg->labels) { | |
1149 | + label = list_entry(pos, struct pxe_label, list); | |
1150 | + | |
1151 | + label_destroy(label); | |
1152 | + } | |
1153 | + | |
1154 | + free(cfg); | |
1155 | +} | |
1156 | + | |
1157 | +/* | |
1158 | + * Entry point for parsing a pxe file. This is only used for the top level | |
1159 | + * file. | |
1160 | + * | |
1161 | + * Returns NULL if there is an error, otherwise, returns a pointer to a | |
1162 | + * pxe_menu struct populated with the results of parsing the pxe file (and any | |
1163 | + * files it includes). The resulting pxe_menu struct can be free()'d by using | |
1164 | + * the destroy_pxe_menu() function. | |
1165 | + */ | |
1166 | +static struct pxe_menu *parse_pxefile(char *menucfg) | |
1167 | +{ | |
1168 | + struct pxe_menu *cfg; | |
1169 | + | |
1170 | + cfg = malloc(sizeof(struct pxe_menu)); | |
1171 | + | |
1172 | + if (!cfg) | |
1173 | + return NULL; | |
1174 | + | |
1175 | + memset(cfg, 0, sizeof(struct pxe_menu)); | |
1176 | + | |
1177 | + INIT_LIST_HEAD(&cfg->labels); | |
1178 | + | |
1179 | + if (parse_pxefile_top(menucfg, cfg, 1) < 0) { | |
1180 | + destroy_pxe_menu(cfg); | |
1181 | + return NULL; | |
1182 | + } | |
1183 | + | |
1184 | + return cfg; | |
1185 | +} | |
1186 | + | |
1187 | +/* | |
1188 | + * Converts a pxe_menu struct into a menu struct for use with U-boot's generic | |
1189 | + * menu code. | |
1190 | + */ | |
1191 | +static struct menu *pxe_menu_to_menu(struct pxe_menu *cfg) | |
1192 | +{ | |
1193 | + struct pxe_label *label; | |
1194 | + struct list_head *pos; | |
1195 | + struct menu *m; | |
1196 | + int err; | |
1197 | + | |
1198 | + /* | |
1199 | + * Create a menu and add items for all the labels. | |
1200 | + */ | |
1201 | + m = menu_create(cfg->title, cfg->timeout, cfg->prompt, label_print); | |
1202 | + | |
1203 | + if (!m) | |
1204 | + return NULL; | |
1205 | + | |
1206 | + list_for_each(pos, &cfg->labels) { | |
1207 | + label = list_entry(pos, struct pxe_label, list); | |
1208 | + | |
1209 | + if (menu_item_add(m, label->name, label) != 1) { | |
1210 | + menu_destroy(m); | |
1211 | + return NULL; | |
1212 | + } | |
1213 | + } | |
1214 | + | |
1215 | + /* | |
1216 | + * After we've created items for each label in the menu, set the | |
1217 | + * menu's default label if one was specified. | |
1218 | + */ | |
1219 | + if (cfg->default_label) { | |
1220 | + err = menu_default_set(m, cfg->default_label); | |
1221 | + if (err != 1) { | |
1222 | + if (err != -ENOENT) { | |
1223 | + menu_destroy(m); | |
1224 | + return NULL; | |
1225 | + } | |
1226 | + | |
1227 | + printf("Missing default: %s\n", cfg->default_label); | |
1228 | + } | |
1229 | + } | |
1230 | + | |
1231 | + return m; | |
1232 | +} | |
1233 | + | |
1234 | +/* | |
1235 | + * Try to boot any labels we have yet to attempt to boot. | |
1236 | + */ | |
1237 | +static void boot_unattempted_labels(struct pxe_menu *cfg) | |
1238 | +{ | |
1239 | + struct list_head *pos; | |
1240 | + struct pxe_label *label; | |
1241 | + | |
1242 | + list_for_each(pos, &cfg->labels) { | |
1243 | + label = list_entry(pos, struct pxe_label, list); | |
1244 | + | |
1245 | + if (!label->attempted) | |
1246 | + label_boot(label); | |
1247 | + } | |
1248 | +} | |
1249 | + | |
1250 | +/* | |
1251 | + * Boot the system as prescribed by a pxe_menu. | |
1252 | + * | |
1253 | + * Use the menu system to either get the user's choice or the default, based | |
1254 | + * on config or user input. If there is no default or user's choice, | |
1255 | + * attempted to boot labels in the order they were given in pxe files. | |
1256 | + * If the default or user's choice fails to boot, attempt to boot other | |
1257 | + * labels in the order they were given in pxe files. | |
1258 | + * | |
1259 | + * If this function returns, there weren't any labels that successfully | |
1260 | + * booted, or the user interrupted the menu selection via ctrl+c. | |
1261 | + */ | |
1262 | +static void handle_pxe_menu(struct pxe_menu *cfg) | |
1263 | +{ | |
1264 | + void *choice; | |
1265 | + struct menu *m; | |
1266 | + int err; | |
1267 | + | |
1268 | + m = pxe_menu_to_menu(cfg); | |
1269 | + if (!m) | |
1270 | + return; | |
1271 | + | |
1272 | + err = menu_get_choice(m, &choice); | |
1273 | + | |
1274 | + menu_destroy(m); | |
1275 | + | |
1276 | + if (err < 1) | |
1277 | + return; | |
1278 | + | |
1279 | + label_boot(choice); | |
1280 | + | |
1281 | + boot_unattempted_labels(cfg); | |
1282 | +} | |
1283 | + | |
1284 | +/* | |
1285 | + * Boots a system using a pxe file | |
1286 | + * | |
1287 | + * Returns 0 on success, 1 on error. | |
1288 | + */ | |
1289 | +static int | |
1290 | +do_pxe_boot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) | |
1291 | +{ | |
1292 | + unsigned long pxefile_addr_r; | |
1293 | + struct pxe_menu *cfg; | |
1294 | + char *pxefile_addr_str; | |
1295 | + | |
1296 | + if (argc == 1) { | |
1297 | + pxefile_addr_str = from_env("pxefile_addr_r"); | |
1298 | + if (!pxefile_addr_str) | |
1299 | + return 1; | |
1300 | + | |
1301 | + } else if (argc == 2) { | |
1302 | + pxefile_addr_str = argv[1]; | |
1303 | + } else { | |
1304 | + return cmd_usage(cmdtp); | |
1305 | + } | |
1306 | + | |
1307 | + if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) { | |
1308 | + printf("Invalid pxefile address: %s\n", pxefile_addr_str); | |
1309 | + return 1; | |
1310 | + } | |
1311 | + | |
1312 | + cfg = parse_pxefile((char *)(pxefile_addr_r)); | |
1313 | + | |
1314 | + if (cfg == NULL) { | |
1315 | + printf("Error parsing config file\n"); | |
1316 | + return 1; | |
1317 | + } | |
1318 | + | |
1319 | + handle_pxe_menu(cfg); | |
1320 | + | |
1321 | + destroy_pxe_menu(cfg); | |
1322 | + | |
1323 | + return 0; | |
1324 | +} | |
1325 | + | |
1326 | +static cmd_tbl_t cmd_pxe_sub[] = { | |
1327 | + U_BOOT_CMD_MKENT(get, 1, 1, do_pxe_get, "", ""), | |
1328 | + U_BOOT_CMD_MKENT(boot, 2, 1, do_pxe_boot, "", "") | |
1329 | +}; | |
1330 | + | |
1331 | +int do_pxe(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) | |
1332 | +{ | |
1333 | + cmd_tbl_t *cp; | |
1334 | + | |
1335 | + if (argc < 2) | |
1336 | + return cmd_usage(cmdtp); | |
1337 | + | |
1338 | + /* drop initial "pxe" arg */ | |
1339 | + argc--; | |
1340 | + argv++; | |
1341 | + | |
1342 | + cp = find_cmd_tbl(argv[0], cmd_pxe_sub, ARRAY_SIZE(cmd_pxe_sub)); | |
1343 | + | |
1344 | + if (cp) | |
1345 | + return cp->cmd(cmdtp, flag, argc, argv); | |
1346 | + | |
1347 | + return cmd_usage(cmdtp); | |
1348 | +} | |
1349 | + | |
1350 | +U_BOOT_CMD( | |
1351 | + pxe, 3, 1, do_pxe, | |
1352 | + "commands to get and boot from pxe files", | |
1353 | + "get - try to retrieve a pxe file using tftp\npxe " | |
1354 | + "boot [pxefile_addr_r] - boot from the pxe file at pxefile_addr_r\n" | |
1355 | +); |
common/main.c
doc/README.pxe
1 | +/* | |
2 | + * Copyright 2010-2011 Calxeda, Inc. | |
3 | + * | |
4 | + * This program is free software; you can redistribute it and/or modify it | |
5 | + * under the terms of the GNU General Public License as published by the Free | |
6 | + * Software Foundation; either version 2 of the License, or (at your option) | |
7 | + * any later version. | |
8 | + * | |
9 | + * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | + * more details. | |
13 | + * | |
14 | + * You should have received a copy of the GNU General Public License along with | |
15 | + * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | + */ | |
17 | + | |
18 | +The 'pxe' commands provide a near subset of the functionality provided by | |
19 | +the PXELINUX boot loader. This allows U-boot based systems to be controlled | |
20 | +remotely using the same PXE based techniques that many non U-boot based servers | |
21 | +use. | |
22 | + | |
23 | +Commands | |
24 | +======== | |
25 | + | |
26 | +pxe get | |
27 | +------- | |
28 | + syntax: pxe get | |
29 | + | |
30 | + follows PXELINUX's rules for retrieving configuration files from a tftp | |
31 | + server, and supports a subset of PXELINUX's config file syntax. | |
32 | + | |
33 | + Environment | |
34 | + ----------- | |
35 | + 'pxe get' requires two environment variables to be set: | |
36 | + | |
37 | + pxefile_addr_r - should be set to a location in RAM large enough to hold | |
38 | + pxe files while they're being processed. Up to 16 config files may be | |
39 | + held in memory at once. The exact number and size of the files varies with | |
40 | + how the system is being used. A typical config file is a few hundred bytes | |
41 | + long. | |
42 | + | |
43 | + bootfile,serverip - these two are typically set in the DHCP response | |
44 | + handler, and correspond to fields in the DHCP response. | |
45 | + | |
46 | + 'pxe get' optionally supports these two environment variables being set: | |
47 | + | |
48 | + ethaddr - this is the standard MAC address for the ethernet adapter in use. | |
49 | + 'pxe get' uses it to look for a configuration file specific to a system's | |
50 | + MAC address. | |
51 | + | |
52 | + pxeuuid - this is a UUID in standard form using lower case hexadecimal | |
53 | + digits, for example, 550e8400-e29b-41d4-a716-446655440000. 'pxe get' uses | |
54 | + it to look for a configuration file based on the system's UUID. | |
55 | + | |
56 | + File Paths | |
57 | + ---------- | |
58 | + 'pxe get' repeatedly tries to download config files until it either | |
59 | + successfully downloads one or runs out of paths to try. The order and | |
60 | + contents of paths it tries mirrors exactly that of PXELINUX - you can | |
61 | + read in more detail about it at: | |
62 | + | |
63 | + http://syslinux.zytor.com/wiki/index.php/Doc/pxelinux | |
64 | + | |
65 | +pxe boot | |
66 | +-------- | |
67 | + syntax: pxe boot [pxefile_addr_r] | |
68 | + | |
69 | + Interprets a pxe file stored in memory. | |
70 | + | |
71 | + pxefile_addr_r is an optional argument giving the location of the pxe file. | |
72 | + The file must be terminated with a NUL byte. | |
73 | + | |
74 | + Environment | |
75 | + ----------- | |
76 | + There are some environment variables that may need to be set, depending | |
77 | + on conditions. | |
78 | + | |
79 | + pxefile_addr_r - if the optional argument pxefile_addr_r is not supplied, | |
80 | + an environment variable named pxefile_addr_r must be supplied. This is | |
81 | + typically the same value as is used for the 'pxe get' command. | |
82 | + | |
83 | + bootfile - typically set in the DHCP response handler based on the | |
84 | + same field in the DHCP respone, this path is used to generate the base | |
85 | + directory that all other paths to files retrieved by 'pxe boot' will use. | |
86 | + If no bootfile is specified, paths used in pxe files will be used as is. | |
87 | + | |
88 | + serverip - typically set in the DHCP response handler, this is the IP | |
89 | + address of the tftp server from which other files will be retrieved. | |
90 | + | |
91 | + kernel_addr_r, initrd_addr_r - locations in RAM at which 'pxe boot' will | |
92 | + store the kernel and initrd it retrieves from tftp. These locations will | |
93 | + be passed to the bootm command to boot the kernel. These environment | |
94 | + variables are required to be set. | |
95 | + | |
96 | + fdt_addr - the location of a fdt blob. If this is set, it will be passed | |
97 | + to bootm when booting a kernel. | |
98 | + | |
99 | +pxe file format | |
100 | +=============== | |
101 | +The pxe file format is nearly a subset of the PXELINUX file format; see | |
102 | +http://syslinux.zytor.com/wiki/index.php/PXELINUX. It's composed of one line | |
103 | +commands - global commands, and commands specific to labels. Lines begining | |
104 | +with # are treated as comments. White space between and at the beginning of | |
105 | +lines is ignored. | |
106 | + | |
107 | +The size of pxe files and the number of labels is only limited by the amount | |
108 | +of RAM available to U-boot. Memory for labels is dynamically allocated as | |
109 | +they're parsed, and memory for pxe files is statically allocated, and its | |
110 | +location is given by the pxefile_addr_r environment variable. The pxe code is | |
111 | +not aware of the size of the pxefile memory and will outgrow it if pxe files | |
112 | +are too large. | |
113 | + | |
114 | +Supported global commands | |
115 | +------------------------- | |
116 | +Unrecognized commands are ignored. | |
117 | + | |
118 | +default <label> - the label named here is treated as the default and is | |
119 | + the first label 'pxe boot' attempts to boot. | |
120 | + | |
121 | +menu title <string> - sets a title for the menu of labels being displayed. | |
122 | + | |
123 | +menu include <path> - use tftp to retrieve the pxe file at <path>, which | |
124 | + is then immediately parsed as if the start of its | |
125 | + contents were the next line in the current file. nesting | |
126 | + of include up to 16 files deep is supported. | |
127 | + | |
128 | +prompt <flag> - if 1, always prompt the user to enter a label to boot | |
129 | + from. if 0, only prompt the user if timeout expires. | |
130 | + | |
131 | +timeout <num> - wait for user input for <num>/10 seconds before | |
132 | + auto-booting a node. | |
133 | + | |
134 | +label <name> - begin a label definition. labels continue until | |
135 | + a command not recognized as a label command is seen, | |
136 | + or EOF is reached. | |
137 | + | |
138 | +Supported label commands | |
139 | +------------------------ | |
140 | +labels end when a command not recognized as a label command is reached, or EOF. | |
141 | + | |
142 | +menu default - set this label as the default label to boot; this is | |
143 | + the same behavior as the global default command but | |
144 | + specified in a different way | |
145 | + | |
146 | +kernel <path> - if this label is chosen, use tftp to retrieve the kernel | |
147 | + at <path>. it will be stored at the address indicated in | |
148 | + the kernel_addr_r environment variable, and that address | |
149 | + will be passed to bootm to boot this kernel. | |
150 | + | |
151 | +append <string> - use <string> as the kernel command line when booting this | |
152 | + label. | |
153 | + | |
154 | +initrd <path> - if this label is chosen, use tftp to retrieve the initrd | |
155 | + at <path>. it will be stored at the address indicated in | |
156 | + the initrd_addr_r environment variable, and that address | |
157 | + will be passed to bootm. | |
158 | + | |
159 | +localboot <flag> - Run the command defined by "localcmd" in the environment. | |
160 | + <flag> is ignored and is only here to match the syntax of | |
161 | + PXELINUX config files. | |
162 | + | |
163 | +Example | |
164 | +------- | |
165 | +Here's a couple of example files to show how this works. | |
166 | + | |
167 | +------------/tftpboot/pxelinux.cfg/menus/linux.list---------- | |
168 | +menu title Linux selections | |
169 | + | |
170 | +# This is the default label | |
171 | +label install | |
172 | + menu label Default Install Image | |
173 | + kernel kernels/install.bin | |
174 | + append console=ttyAMA0,38400 debug earlyprintk | |
175 | + initrd initrds/uzInitrdDebInstall | |
176 | + | |
177 | +# Just another label | |
178 | +label linux-2.6.38 | |
179 | + kernel kernels/linux-2.6.38.bin | |
180 | + append root=/dev/sdb1 | |
181 | + | |
182 | +# The locally installed kernel | |
183 | +label local | |
184 | + menu label Locally installed kernel | |
185 | + append root=/dev/sdb1 | |
186 | + localboot 1 | |
187 | +------------------------------------------------------------- | |
188 | + | |
189 | +------------/tftpboot/pxelinux.cfg/default------------------- | |
190 | +menu include pxelinux.cfg/menus/base.menu | |
191 | +timeout 500 | |
192 | + | |
193 | +default linux-2.6.38 | |
194 | +------------------------------------------------------------- | |
195 | + | |
196 | +When a pxe client retrieves and boots the default pxe file, | |
197 | +'pxe boot' will wait for user input for 5 seconds before booting | |
198 | +the linux-2.6.38 label, which will cause /tftpboot/kernels/linux-2.6.38.bin | |
199 | +to be downloaded, and boot with the command line "root=/dev/sdb1" | |
200 | + | |
201 | +Differences with PXELINUX | |
202 | +========================= | |
203 | +The biggest difference between U-boot's pxe and PXELINUX is that since | |
204 | +U-boot's pxe support is written entirely in C, it can run on any platform | |
205 | +with network support in U-boot. Here are some other differences between | |
206 | +PXELINUX and U-boot's pxe support. | |
207 | + | |
208 | +- U-boot's pxe does not support the PXELINUX DHCP option codes specified | |
209 | + in RFC 5071, but could be extended to do so. | |
210 | + | |
211 | +- when U-boot's pxe fails to boot, it will return control to U-boot, | |
212 | + allowing another command to run, other U-boot command, instead of resetting | |
213 | + the machine like PXELINUX. | |
214 | + | |
215 | +- U-boot's pxe doesn't rely on or provide an UNDI/PXE stack in memory, it | |
216 | + only uses U-boot. | |
217 | + | |
218 | +- U-boot's pxe doesn't provide the full menu implementation that PXELINUX | |
219 | + does, only a simple text based menu using the commands described in | |
220 | + this README. With PXELINUX, it's possible to have a graphical boot | |
221 | + menu, submenus, passwords, etc. U-boot's pxe could be extended to support | |
222 | + a more robust menuing system like that of PXELINUX's. | |
223 | + | |
224 | +- U-boot's pxe expects U-boot uimg's as kernels. Anything that would work | |
225 | + with the 'bootm' command in U-boot could work with the 'pxe boot' command. | |
226 | + | |
227 | +- U-boot's pxe doesn't recognize initrd options in the append command - you | |
228 | + must specify initrd files using the initrd command. | |
229 | + | |
230 | +- U-boot's pxe only recognizes a single file on the initrd command line. It | |
231 | + could be extended to support multiple. | |
232 | + | |
233 | +- in U-boot's pxe, the localboot command doesn't necessarily cause a local | |
234 | + disk boot - it will do whatever is defined in the 'localcmd' env | |
235 | + variable. And since it doesn't support a full UNDI/PXE stack, the | |
236 | + type field is ignored. | |
237 | + | |
238 | +- the interactive prompt in U-boot's pxe only allows you to choose a label | |
239 | + from the menu. If you want to boot something not listed, you can ctrl+c | |
240 | + out of 'pxe boot' and use existing U-boot commands to accomplish it. |
include/common.h
... | ... | @@ -255,6 +255,9 @@ |
255 | 255 | /* common/main.c */ |
256 | 256 | void main_loop (void); |
257 | 257 | int run_command (const char *cmd, int flag); |
258 | +#ifdef CONFIG_CMD_PXE | |
259 | +int run_command2(const char *cmd, int flag); | |
260 | +#endif | |
258 | 261 | int readline (const char *const prompt); |
259 | 262 | int readline_into_buffer (const char *const prompt, char * buffer); |
260 | 263 | int parse_line (char *, char *[]); |
... | ... | @@ -284,6 +287,9 @@ |
284 | 287 | |
285 | 288 | /* common/cmd_doc.c */ |
286 | 289 | void doc_probe(unsigned long physadr); |
290 | + | |
291 | +/* common/cmd_net.c */ | |
292 | +int do_tftpb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); | |
287 | 293 | |
288 | 294 | /* common/cmd_nvedit.c */ |
289 | 295 | int env_init (void); |