Merge tag 'pull-target-arm-20220812' of https://git.linaro.org/people/pmaydell/qemu...
[qemu.git] / pc-bios / s390-ccw / bootmap.c
1 /*
2 * QEMU S390 bootmap interpreter
3 *
4 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or (at
7 * your option) any later version. See the COPYING file in the top-level
8 * directory.
9 */
10
11 #include "libc.h"
12 #include "s390-ccw.h"
13 #include "s390-arch.h"
14 #include "bootmap.h"
15 #include "virtio.h"
16 #include "bswap.h"
17
18 #ifdef DEBUG
19 /* #define DEBUG_FALLBACK */
20 #endif
21
22 #ifdef DEBUG_FALLBACK
23 #define dputs(txt) \
24 do { sclp_print("zipl: " txt); } while (0)
25 #else
26 #define dputs(fmt, ...) \
27 do { } while (0)
28 #endif
29
30 /* Scratch space */
31 static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE)));
32
33 const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION"
34 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
35
36 /*
37 * Match two CCWs located after PSW and eight filler bytes.
38 * From libmagic and arch/s390/kernel/head.S.
39 */
40 const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00"
41 "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40"
42 "\x40\x40\x40\x40";
43
44 static inline bool is_iso_vd_valid(IsoVolDesc *vd)
45 {
46 const uint8_t vol_desc_magic[] = "CD001";
47
48 return !memcmp(&vd->ident[0], vol_desc_magic, 5) &&
49 vd->version == 0x1 &&
50 vd->type <= VOL_DESC_TYPE_PARTITION;
51 }
52
53 /***********************************************************************
54 * IPL an ECKD DASD (CDL or LDL/CMS format)
55 */
56
57 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */
58 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr);
59 static uint8_t _s2[MAX_SECTOR_SIZE * 3] __attribute__((__aligned__(PAGE_SIZE)));
60 static void *s2_prev_blk = _s2;
61 static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE;
62 static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2;
63
64 static inline void verify_boot_info(BootInfo *bip)
65 {
66 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo");
67 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version");
68 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL");
69 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD");
70 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch");
71 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size),
72 "Bad block size in zIPL section of the 1st record.");
73 }
74
75 static block_number_t eckd_block_num(EckdCHS *chs)
76 {
77 const uint64_t sectors = virtio_get_sectors();
78 const uint64_t heads = virtio_get_heads();
79 const uint64_t cylinder = chs->cylinder
80 + ((chs->head & 0xfff0) << 12);
81 const uint64_t head = chs->head & 0x000f;
82 const block_number_t block = sectors * heads * cylinder
83 + sectors * head
84 + chs->sector
85 - 1; /* block nr starts with zero */
86 return block;
87 }
88
89 static bool eckd_valid_address(BootMapPointer *p)
90 {
91 const uint64_t head = p->eckd.chs.head & 0x000f;
92
93 if (head >= virtio_get_heads()
94 || p->eckd.chs.sector > virtio_get_sectors()
95 || p->eckd.chs.sector <= 0) {
96 return false;
97 }
98
99 if (!virtio_guessed_disk_nature() &&
100 eckd_block_num(&p->eckd.chs) >= virtio_get_blocks()) {
101 return false;
102 }
103
104 return true;
105 }
106
107 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address)
108 {
109 block_number_t block_nr;
110 int j, rc;
111 BootMapPointer *bprs = (void *)_bprs;
112 bool more_data;
113
114 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
115 read_block(blk, bprs, "BPRS read failed");
116
117 do {
118 more_data = false;
119 for (j = 0;; j++) {
120 block_nr = eckd_block_num(&bprs[j].xeckd.bptr.chs);
121 if (is_null_block_number(block_nr)) { /* end of chunk */
122 break;
123 }
124
125 /* we need the updated blockno for the next indirect entry
126 * in the chain, but don't want to advance address
127 */
128 if (j == (max_bprs_entries - 1)) {
129 break;
130 }
131
132 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size),
133 "bad chunk block size");
134 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr");
135
136 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]),
137 sizeof(EckdBlockPtr))) {
138 /* This is a "continue" pointer.
139 * This ptr should be the last one in the current
140 * script section.
141 * I.e. the next ptr must point to the unused memory area
142 */
143 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
144 read_block(block_nr, bprs, "BPRS continuation read failed");
145 more_data = true;
146 break;
147 }
148
149 /* Load (count+1) blocks of code at (block_nr)
150 * to memory (address).
151 */
152 rc = virtio_read_many(block_nr, (void *)(*address),
153 bprs[j].xeckd.bptr.count+1);
154 IPL_assert(rc == 0, "code chunk read failed");
155
156 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size();
157 }
158 } while (more_data);
159 return block_nr;
160 }
161
162 static bool find_zipl_boot_menu_banner(int *offset)
163 {
164 int i;
165
166 /* Menu banner starts with "zIPL" */
167 for (i = 0; i <= virtio_get_block_size() - 4; i++) {
168 if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) {
169 *offset = i;
170 return true;
171 }
172 }
173
174 return false;
175 }
176
177 static int eckd_get_boot_menu_index(block_number_t s1b_block_nr)
178 {
179 block_number_t cur_block_nr;
180 block_number_t prev_block_nr = 0;
181 block_number_t next_block_nr = 0;
182 EckdStage1b *s1b = (void *)sec;
183 int banner_offset;
184 int i;
185
186 /* Get Stage1b data */
187 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
188 read_block(s1b_block_nr, s1b, "Cannot read stage1b boot loader");
189
190 memset(_s2, FREE_SPACE_FILLER, sizeof(_s2));
191
192 /* Get Stage2 data */
193 for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) {
194 cur_block_nr = eckd_block_num(&s1b->seek[i].chs);
195
196 if (!cur_block_nr || is_null_block_number(cur_block_nr)) {
197 break;
198 }
199
200 read_block(cur_block_nr, s2_cur_blk, "Cannot read stage2 boot loader");
201
202 if (find_zipl_boot_menu_banner(&banner_offset)) {
203 /*
204 * Load the adjacent blocks to account for the
205 * possibility of menu data spanning multiple blocks.
206 */
207 if (prev_block_nr) {
208 read_block(prev_block_nr, s2_prev_blk,
209 "Cannot read stage2 boot loader");
210 }
211
212 if (i + 1 < STAGE2_BLK_CNT_MAX) {
213 next_block_nr = eckd_block_num(&s1b->seek[i + 1].chs);
214 }
215
216 if (next_block_nr && !is_null_block_number(next_block_nr)) {
217 read_block(next_block_nr, s2_next_blk,
218 "Cannot read stage2 boot loader");
219 }
220
221 return menu_get_zipl_boot_index(s2_cur_blk + banner_offset);
222 }
223
224 prev_block_nr = cur_block_nr;
225 }
226
227 sclp_print("No zipl boot menu data found. Booting default entry.");
228 return 0;
229 }
230
231 static void run_eckd_boot_script(block_number_t bmt_block_nr,
232 block_number_t s1b_block_nr)
233 {
234 int i;
235 unsigned int loadparm = get_loadparm_index();
236 block_number_t block_nr;
237 uint64_t address;
238 BootMapTable *bmt = (void *)sec;
239 BootMapScript *bms = (void *)sec;
240
241 if (menu_is_enabled_zipl()) {
242 loadparm = eckd_get_boot_menu_index(s1b_block_nr);
243 }
244
245 debug_print_int("loadparm", loadparm);
246 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than"
247 " maximum number of boot entries allowed");
248
249 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
250 read_block(bmt_block_nr, sec, "Cannot read Boot Map Table");
251
252 block_nr = eckd_block_num(&bmt->entry[loadparm].xeckd.bptr.chs);
253 IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry");
254
255 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
256 read_block(block_nr, sec, "Cannot read Boot Map Script");
257
258 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD ||
259 bms->entry[i].type == BOOT_SCRIPT_SIGNATURE; i++) {
260
261 /* We don't support secure boot yet, so we skip signature entries */
262 if (bms->entry[i].type == BOOT_SCRIPT_SIGNATURE) {
263 continue;
264 }
265
266 address = bms->entry[i].address.load_address;
267 block_nr = eckd_block_num(&bms->entry[i].blkptr.xeckd.bptr.chs);
268
269 do {
270 block_nr = load_eckd_segments(block_nr, &address);
271 } while (block_nr != -1);
272 }
273
274 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC,
275 "Unknown script entry type");
276 write_reset_psw(bms->entry[i].address.load_address); /* no return */
277 jump_to_IPL_code(0); /* no return */
278 }
279
280 static void ipl_eckd_cdl(void)
281 {
282 XEckdMbr *mbr;
283 EckdCdlIpl2 *ipl2 = (void *)sec;
284 IplVolumeLabel *vlbl = (void *)sec;
285 block_number_t bmt_block_nr, s1b_block_nr;
286
287 /* we have just read the block #0 and recognized it as "IPL1" */
288 sclp_print("CDL\n");
289
290 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
291 read_block(1, ipl2, "Cannot read IPL2 record at block 1");
292
293 mbr = &ipl2->mbr;
294 if (!magic_match(mbr, ZIPL_MAGIC)) {
295 sclp_print("No zIPL section in IPL2 record.\n");
296 return;
297 }
298 if (!block_size_ok(mbr->blockptr.xeckd.bptr.size)) {
299 sclp_print("Bad block size in zIPL section of IPL2 record.\n");
300 return;
301 }
302 if (mbr->dev_type != DEV_TYPE_ECKD) {
303 sclp_print("Non-ECKD device type in zIPL section of IPL2 record.\n");
304 return;
305 }
306
307 /* save pointer to Boot Map Table */
308 bmt_block_nr = eckd_block_num(&mbr->blockptr.xeckd.bptr.chs);
309
310 /* save pointer to Stage1b Data */
311 s1b_block_nr = eckd_block_num(&ipl2->stage1.seek[0].chs);
312
313 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
314 read_block(2, vlbl, "Cannot read Volume Label at block 2");
315 if (!magic_match(vlbl->key, VOL1_MAGIC)) {
316 sclp_print("Invalid magic of volume label block.\n");
317 return;
318 }
319 if (!magic_match(vlbl->f.key, VOL1_MAGIC)) {
320 sclp_print("Invalid magic of volser block.\n");
321 return;
322 }
323 print_volser(vlbl->f.volser);
324
325 run_eckd_boot_script(bmt_block_nr, s1b_block_nr);
326 /* no return */
327 }
328
329 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode)
330 {
331 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */
332 char msg[4] = { '?', '.', '\n', '\0' };
333
334 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL");
335 sclp_print(" version ");
336 switch (vlbl->LDL_version) {
337 case LDL1_VERSION:
338 msg[0] = '1';
339 break;
340 case LDL2_VERSION:
341 msg[0] = '2';
342 break;
343 default:
344 msg[0] = ebc2asc[vlbl->LDL_version];
345 msg[1] = '?';
346 break;
347 }
348 sclp_print(msg);
349 print_volser(vlbl->volser);
350 }
351
352 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
353 {
354 block_number_t bmt_block_nr, s1b_block_nr;
355 EckdLdlIpl1 *ipl1 = (void *)sec;
356
357 if (mode != ECKD_LDL_UNLABELED) {
358 print_eckd_ldl_msg(mode);
359 }
360
361 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */
362
363 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
364 read_block(0, sec, "Cannot read block 0 to grab boot info.");
365 if (mode == ECKD_LDL_UNLABELED) {
366 if (!magic_match(ipl1->bip.magic, ZIPL_MAGIC)) {
367 return; /* not applicable layout */
368 }
369 sclp_print("unlabeled LDL.\n");
370 }
371 verify_boot_info(&ipl1->bip);
372
373 /* save pointer to Boot Map Table */
374 bmt_block_nr = eckd_block_num(&ipl1->bip.bp.ipl.bm_ptr.eckd.bptr.chs);
375
376 /* save pointer to Stage1b Data */
377 s1b_block_nr = eckd_block_num(&ipl1->stage1.seek[0].chs);
378
379 run_eckd_boot_script(bmt_block_nr, s1b_block_nr);
380 /* no return */
381 }
382
383 static void print_eckd_msg(void)
384 {
385 char msg[] = "Using ECKD scheme (block size *****), ";
386 char *p = &msg[34], *q = &msg[30];
387 int n = virtio_get_block_size();
388
389 /* Fill in the block size and show up the message */
390 if (n > 0 && n <= 99999) {
391 while (n) {
392 *p-- = '0' + (n % 10);
393 n /= 10;
394 }
395 while (p >= q) {
396 *p-- = ' ';
397 }
398 }
399 sclp_print(msg);
400 }
401
402 static void ipl_eckd(void)
403 {
404 XEckdMbr *mbr = (void *)sec;
405 LDL_VTOC *vlbl = (void *)sec;
406
407 print_eckd_msg();
408
409 /* Grab the MBR again */
410 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
411 read_block(0, mbr, "Cannot read block 0 on DASD");
412
413 if (magic_match(mbr->magic, IPL1_MAGIC)) {
414 ipl_eckd_cdl(); /* only returns in case of error */
415 return;
416 }
417
418 /* LDL/CMS? */
419 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
420 read_block(2, vlbl, "Cannot read block 2");
421
422 if (magic_match(vlbl->magic, CMS1_MAGIC)) {
423 ipl_eckd_ldl(ECKD_CMS); /* no return */
424 }
425 if (magic_match(vlbl->magic, LNX1_MAGIC)) {
426 ipl_eckd_ldl(ECKD_LDL); /* no return */
427 }
428
429 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */
430 /*
431 * Ok, it is not a LDL by any means.
432 * It still might be a CDL with zero record keys for IPL1 and IPL2
433 */
434 ipl_eckd_cdl();
435 }
436
437 /***********************************************************************
438 * IPL a SCSI disk
439 */
440
441 static void zipl_load_segment(ComponentEntry *entry)
442 {
443 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr));
444 ScsiBlockPtr *bprs = (void *)sec;
445 const int bprs_size = sizeof(sec);
446 block_number_t blockno;
447 uint64_t address;
448 int i;
449 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ";
450 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */
451
452 blockno = entry->data.blockno;
453 address = entry->compdat.load_addr;
454
455 debug_print_int("loading segment at block", blockno);
456 debug_print_int("addr", address);
457
458 do {
459 memset(bprs, FREE_SPACE_FILLER, bprs_size);
460 fill_hex_val(blk_no, &blockno, sizeof(blockno));
461 read_block(blockno, bprs, err_msg);
462
463 for (i = 0;; i++) {
464 uint64_t *cur_desc = (void *)&bprs[i];
465
466 blockno = bprs[i].blockno;
467 if (!blockno) {
468 break;
469 }
470
471 /* we need the updated blockno for the next indirect entry in the
472 chain, but don't want to advance address */
473 if (i == (max_entries - 1)) {
474 break;
475 }
476
477 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1],
478 sizeof(ScsiBlockPtr))) {
479 /* This is a "continue" pointer.
480 * This ptr is the last one in the current script section.
481 * I.e. the next ptr must point to the unused memory area.
482 * The blockno is not zero, so the upper loop must continue
483 * reading next section of BPRS.
484 */
485 break;
486 }
487 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0,
488 (void *)address);
489 IPL_assert(address != -1, "zIPL load segment failed");
490 }
491 } while (blockno);
492 }
493
494 /* Run a zipl program */
495 static void zipl_run(ScsiBlockPtr *pte)
496 {
497 ComponentHeader *header;
498 ComponentEntry *entry;
499 uint8_t tmp_sec[MAX_SECTOR_SIZE];
500
501 read_block(pte->blockno, tmp_sec, "Cannot read header");
502 header = (ComponentHeader *)tmp_sec;
503
504 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header");
505 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type");
506
507 dputs("start loading images\n");
508
509 /* Load image(s) into RAM */
510 entry = (ComponentEntry *)(&header[1]);
511 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD ||
512 entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) {
513
514 /* We don't support secure boot yet, so we skip signature entries */
515 if (entry->component_type == ZIPL_COMP_ENTRY_SIGNATURE) {
516 entry++;
517 continue;
518 }
519
520 zipl_load_segment(entry);
521
522 entry++;
523
524 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE),
525 "Wrong entry value");
526 }
527
528 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry");
529
530 /* should not return */
531 write_reset_psw(entry->compdat.load_psw);
532 jump_to_IPL_code(0);
533 }
534
535 static void ipl_scsi(void)
536 {
537 ScsiMbr *mbr = (void *)sec;
538 int program_table_entries = 0;
539 BootMapTable *prog_table = (void *)sec;
540 unsigned int loadparm = get_loadparm_index();
541 bool valid_entries[MAX_BOOT_ENTRIES] = {false};
542 size_t i;
543
544 /* Grab the MBR */
545 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
546 read_block(0, mbr, "Cannot read block 0");
547
548 if (!magic_match(mbr->magic, ZIPL_MAGIC)) {
549 return;
550 }
551
552 sclp_print("Using SCSI scheme.\n");
553 debug_print_int("MBR Version", mbr->version_id);
554 IPL_check(mbr->version_id == 1,
555 "Unknown MBR layout version, assuming version 1");
556 debug_print_int("program table", mbr->pt.blockno);
557 IPL_assert(mbr->pt.blockno, "No Program Table");
558
559 /* Parse the program table */
560 read_block(mbr->pt.blockno, sec, "Error reading Program Table");
561 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT");
562
563 for (i = 0; i < MAX_BOOT_ENTRIES; i++) {
564 if (prog_table->entry[i].scsi.blockno) {
565 valid_entries[i] = true;
566 program_table_entries++;
567 }
568 }
569
570 debug_print_int("program table entries", program_table_entries);
571 IPL_assert(program_table_entries != 0, "Empty Program Table");
572
573 if (menu_is_enabled_enum()) {
574 loadparm = menu_get_enum_boot_index(valid_entries);
575 }
576
577 debug_print_int("loadparm", loadparm);
578 IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than"
579 " maximum number of boot entries allowed");
580
581 zipl_run(&prog_table->entry[loadparm].scsi); /* no return */
582 }
583
584 /***********************************************************************
585 * IPL El Torito ISO9660 image or DVD
586 */
587
588 static bool is_iso_bc_entry_compatible(IsoBcSection *s)
589 {
590 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE);
591
592 if (s->unused || !s->sector_count) {
593 return false;
594 }
595 read_iso_sector(bswap32(s->load_rba), magic_sec,
596 "Failed to read image sector 0");
597
598 /* Checking bytes 8 - 32 for S390 Linux magic */
599 return !memcmp(magic_sec + 8, linux_s390_magic, 24);
600 }
601
602 /* Location of the current sector of the directory */
603 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH];
604 /* Offset in the current sector of the directory */
605 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH];
606 /* Remained directory space in bytes */
607 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH];
608
609 static inline uint32_t iso_get_file_size(uint32_t load_rba)
610 {
611 IsoVolDesc *vd = (IsoVolDesc *)sec;
612 IsoDirHdr *cur_record = &vd->vd.primary.rootdir;
613 uint8_t *temp = sec + ISO_SECTOR_SIZE;
614 int level = 0;
615
616 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec,
617 "Failed to read ISO primary descriptor");
618 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc);
619 dir_rem[0] = 0;
620 sec_offset[0] = 0;
621
622 while (level >= 0) {
623 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE,
624 "Directory tree structure violation");
625
626 cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
627
628 if (sec_offset[level] == 0) {
629 read_iso_sector(sec_loc[level], temp,
630 "Failed to read ISO directory");
631 if (dir_rem[level] == 0) {
632 /* Skip self and parent records */
633 dir_rem[level] = iso_733_to_u32(cur_record->data_len) -
634 cur_record->dr_len;
635 sec_offset[level] += cur_record->dr_len;
636
637 cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
638 dir_rem[level] -= cur_record->dr_len;
639 sec_offset[level] += cur_record->dr_len;
640 continue;
641 }
642 }
643
644 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) {
645 /* Zero-padding and/or the end of current sector */
646 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level];
647 sec_offset[level] = 0;
648 sec_loc[level]++;
649 } else {
650 /* The directory record is valid */
651 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) {
652 return iso_733_to_u32(cur_record->data_len);
653 }
654
655 dir_rem[level] -= cur_record->dr_len;
656 sec_offset[level] += cur_record->dr_len;
657
658 if (cur_record->file_flags & 0x2) {
659 /* Subdirectory */
660 if (level == ISO9660_MAX_DIR_DEPTH - 1) {
661 sclp_print("ISO-9660 directory depth limit exceeded\n");
662 } else {
663 level++;
664 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc);
665 sec_offset[level] = 0;
666 dir_rem[level] = 0;
667 continue;
668 }
669 }
670 }
671
672 if (dir_rem[level] == 0) {
673 /* Nothing remaining */
674 level--;
675 read_iso_sector(sec_loc[level], temp,
676 "Failed to read ISO directory");
677 }
678 }
679
680 return 0;
681 }
682
683 static void load_iso_bc_entry(IsoBcSection *load)
684 {
685 IsoBcSection s = *load;
686 /*
687 * According to spec, extent for each file
688 * is padded and ISO_SECTOR_SIZE bytes aligned
689 */
690 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT;
691 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba));
692
693 if (real_size) {
694 /* Round up blocks to load */
695 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE;
696 sclp_print("ISO boot image size verified\n");
697 } else {
698 sclp_print("ISO boot image size could not be verified\n");
699 }
700
701 read_iso_boot_image(bswap32(s.load_rba),
702 (void *)((uint64_t)bswap16(s.load_segment)),
703 blks_to_load);
704
705 jump_to_low_kernel();
706 }
707
708 static uint32_t find_iso_bc(void)
709 {
710 IsoVolDesc *vd = (IsoVolDesc *)sec;
711 uint32_t block_num = ISO_PRIMARY_VD_SECTOR;
712
713 if (virtio_read_many(block_num++, sec, 1)) {
714 /* If primary vd cannot be read, there is no boot catalog */
715 return 0;
716 }
717
718 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) {
719 if (vd->type == VOL_DESC_TYPE_BOOT) {
720 IsoVdElTorito *et = &vd->vd.boot;
721
722 if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) {
723 return bswap32(et->bc_offset);
724 }
725 }
726 read_iso_sector(block_num++, sec,
727 "Failed to read ISO volume descriptor");
728 }
729
730 return 0;
731 }
732
733 static IsoBcSection *find_iso_bc_entry(void)
734 {
735 IsoBcEntry *e = (IsoBcEntry *)sec;
736 uint32_t offset = find_iso_bc();
737 int i;
738 unsigned int loadparm = get_loadparm_index();
739
740 if (!offset) {
741 return NULL;
742 }
743
744 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog");
745
746 if (!is_iso_bc_valid(e)) {
747 /* The validation entry is mandatory */
748 panic("No valid boot catalog found!\n");
749 return NULL;
750 }
751
752 /*
753 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries.
754 * We consider only boot catalogs with no more than 64 entries.
755 */
756 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) {
757 if (e[i].id == ISO_BC_BOOTABLE_SECTION) {
758 if (is_iso_bc_entry_compatible(&e[i].body.sect)) {
759 if (loadparm <= 1) {
760 /* found, default, or unspecified */
761 return &e[i].body.sect;
762 }
763 loadparm--;
764 }
765 }
766 }
767
768 panic("No suitable boot entry found on ISO-9660 media!\n");
769
770 return NULL;
771 }
772
773 static void ipl_iso_el_torito(void)
774 {
775 IsoBcSection *s = find_iso_bc_entry();
776
777 if (s) {
778 load_iso_bc_entry(s);
779 /* no return */
780 }
781 }
782
783 /***********************************************************************
784 * Bus specific IPL sequences
785 */
786
787 static void zipl_load_vblk(void)
788 {
789 if (virtio_guessed_disk_nature()) {
790 virtio_assume_iso9660();
791 }
792 ipl_iso_el_torito();
793
794 if (virtio_guessed_disk_nature()) {
795 sclp_print("Using guessed DASD geometry.\n");
796 virtio_assume_eckd();
797 }
798 ipl_eckd();
799 }
800
801 static void zipl_load_vscsi(void)
802 {
803 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) {
804 /* Is it an ISO image in non-CD drive? */
805 ipl_iso_el_torito();
806 }
807
808 sclp_print("Using guessed DASD geometry.\n");
809 virtio_assume_eckd();
810 ipl_eckd();
811 }
812
813 /***********************************************************************
814 * IPL starts here
815 */
816
817 void zipl_load(void)
818 {
819 VDev *vdev = virtio_get_device();
820
821 if (vdev->is_cdrom) {
822 ipl_iso_el_torito();
823 panic("\n! Cannot IPL this ISO image !\n");
824 }
825
826 if (virtio_get_device_type() == VIRTIO_ID_NET) {
827 jump_to_IPL_code(vdev->netboot_start_addr);
828 }
829
830 ipl_scsi();
831
832 switch (virtio_get_device_type()) {
833 case VIRTIO_ID_BLOCK:
834 zipl_load_vblk();
835 break;
836 case VIRTIO_ID_SCSI:
837 zipl_load_vscsi();
838 break;
839 default:
840 panic("\n! Unknown IPL device type !\n");
841 }
842
843 sclp_print("zIPL load failed.\n");
844 }