Merge remote-tracking branch 'remotes/cody/tags/block-pull-request' into staging
[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 "s390-ccw.h"
12 #include "bootmap.h"
13 #include "virtio.h"
14
15 #ifdef DEBUG
16 /* #define DEBUG_FALLBACK */
17 #endif
18
19 #ifdef DEBUG_FALLBACK
20 #define dputs(txt) \
21 do { sclp_print("zipl: " txt); } while (0)
22 #else
23 #define dputs(fmt, ...) \
24 do { } while (0)
25 #endif
26
27 /* Scratch space */
28 static uint8_t sec[MAX_SECTOR_SIZE*4] __attribute__((__aligned__(PAGE_SIZE)));
29
30 typedef struct ResetInfo {
31 uint32_t ipl_mask;
32 uint32_t ipl_addr;
33 uint32_t ipl_continue;
34 } ResetInfo;
35
36 static ResetInfo save;
37
38 static void jump_to_IPL_2(void)
39 {
40 ResetInfo *current = 0;
41
42 void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue;
43 *current = save;
44 ipl(); /* should not return */
45 }
46
47 static void jump_to_IPL_code(uint64_t address)
48 {
49 /* store the subsystem information _after_ the bootmap was loaded */
50 write_subsystem_identification();
51 /*
52 * The IPL PSW is at address 0. We also must not overwrite the
53 * content of non-BIOS memory after we loaded the guest, so we
54 * save the original content and restore it in jump_to_IPL_2.
55 */
56 ResetInfo *current = 0;
57
58 save = *current;
59 current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2;
60 current->ipl_continue = address & 0x7fffffff;
61
62 debug_print_int("set IPL addr to", current->ipl_continue);
63
64 /* Ensure the guest output starts fresh */
65 sclp_print("\n");
66
67 /*
68 * HACK ALERT.
69 * We use the load normal reset to keep r15 unchanged. jump_to_IPL_2
70 * can then use r15 as its stack pointer.
71 */
72 asm volatile("lghi 1,1\n\t"
73 "diag 1,1,0x308\n\t"
74 : : : "1", "memory");
75 panic("\n! IPL returns !\n");
76 }
77
78 /***********************************************************************
79 * IPL an ECKD DASD (CDL or LDL/CMS format)
80 */
81
82 static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */
83 static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr);
84
85 static inline void verify_boot_info(BootInfo *bip)
86 {
87 IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo");
88 IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version");
89 IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL");
90 IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD");
91 IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch");
92 IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size),
93 "Bad block size in zIPL section of the 1st record.");
94 }
95
96 static block_number_t eckd_block_num(BootMapPointer *p)
97 {
98 const uint64_t sectors = virtio_get_sectors();
99 const uint64_t heads = virtio_get_heads();
100 const uint64_t cylinder = p->eckd.cylinder
101 + ((p->eckd.head & 0xfff0) << 12);
102 const uint64_t head = p->eckd.head & 0x000f;
103 const block_number_t block = sectors * heads * cylinder
104 + sectors * head
105 + p->eckd.sector
106 - 1; /* block nr starts with zero */
107 return block;
108 }
109
110 static bool eckd_valid_address(BootMapPointer *p)
111 {
112 const uint64_t head = p->eckd.head & 0x000f;
113
114 if (head >= virtio_get_heads()
115 || p->eckd.sector > virtio_get_sectors()
116 || p->eckd.sector <= 0) {
117 return false;
118 }
119
120 if (!virtio_guessed_disk_nature() &&
121 eckd_block_num(p) >= virtio_get_blocks()) {
122 return false;
123 }
124
125 return true;
126 }
127
128 static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address)
129 {
130 block_number_t block_nr;
131 int j, rc;
132 BootMapPointer *bprs = (void *)_bprs;
133 bool more_data;
134
135 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
136 read_block(blk, bprs, "BPRS read failed");
137
138 do {
139 more_data = false;
140 for (j = 0;; j++) {
141 block_nr = eckd_block_num((void *)&(bprs[j].xeckd));
142 if (is_null_block_number(block_nr)) { /* end of chunk */
143 break;
144 }
145
146 /* we need the updated blockno for the next indirect entry
147 * in the chain, but don't want to advance address
148 */
149 if (j == (max_bprs_entries - 1)) {
150 break;
151 }
152
153 IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size),
154 "bad chunk block size");
155 IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr");
156
157 if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]),
158 sizeof(EckdBlockPtr))) {
159 /* This is a "continue" pointer.
160 * This ptr should be the last one in the current
161 * script section.
162 * I.e. the next ptr must point to the unused memory area
163 */
164 memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
165 read_block(block_nr, bprs, "BPRS continuation read failed");
166 more_data = true;
167 break;
168 }
169
170 /* Load (count+1) blocks of code at (block_nr)
171 * to memory (address).
172 */
173 rc = virtio_read_many(block_nr, (void *)(*address),
174 bprs[j].xeckd.bptr.count+1);
175 IPL_assert(rc == 0, "code chunk read failed");
176
177 *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size();
178 }
179 } while (more_data);
180 return block_nr;
181 }
182
183 static void run_eckd_boot_script(block_number_t mbr_block_nr)
184 {
185 int i;
186 block_number_t block_nr;
187 uint64_t address;
188 ScsiMbr *scsi_mbr = (void *)sec;
189 BootMapScript *bms = (void *)sec;
190
191 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
192 read_block(mbr_block_nr, sec, "Cannot read MBR");
193
194 block_nr = eckd_block_num((void *)&(scsi_mbr->blockptr));
195
196 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
197 read_block(block_nr, sec, "Cannot read Boot Map Script");
198
199 for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) {
200 address = bms->entry[i].address.load_address;
201 block_nr = eckd_block_num(&(bms->entry[i].blkptr));
202
203 do {
204 block_nr = load_eckd_segments(block_nr, &address);
205 } while (block_nr != -1);
206 }
207
208 IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC,
209 "Unknown script entry type");
210 jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
211 }
212
213 static void ipl_eckd_cdl(void)
214 {
215 XEckdMbr *mbr;
216 Ipl2 *ipl2 = (void *)sec;
217 IplVolumeLabel *vlbl = (void *)sec;
218 block_number_t block_nr;
219
220 /* we have just read the block #0 and recognized it as "IPL1" */
221 sclp_print("CDL\n");
222
223 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
224 read_block(1, ipl2, "Cannot read IPL2 record at block 1");
225
226 mbr = &ipl2->u.x.mbr;
227 IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record.");
228 IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size),
229 "Bad block size in zIPL section of IPL2 record.");
230 IPL_assert(mbr->dev_type == DEV_TYPE_ECKD,
231 "Non-ECKD device type in zIPL section of IPL2 record.");
232
233 /* save pointer to Boot Script */
234 block_nr = eckd_block_num((void *)&(mbr->blockptr));
235
236 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
237 read_block(2, vlbl, "Cannot read Volume Label at block 2");
238 IPL_assert(magic_match(vlbl->key, VOL1_MAGIC),
239 "Invalid magic of volume label block");
240 IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC),
241 "Invalid magic of volser block");
242 print_volser(vlbl->f.volser);
243
244 run_eckd_boot_script(block_nr);
245 /* no return */
246 }
247
248 static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode)
249 {
250 LDL_VTOC *vlbl = (void *)sec; /* already read, 3rd block */
251 char msg[4] = { '?', '.', '\n', '\0' };
252
253 sclp_print((mode == ECKD_CMS) ? "CMS" : "LDL");
254 sclp_print(" version ");
255 switch (vlbl->LDL_version) {
256 case LDL1_VERSION:
257 msg[0] = '1';
258 break;
259 case LDL2_VERSION:
260 msg[0] = '2';
261 break;
262 default:
263 msg[0] = vlbl->LDL_version;
264 msg[0] &= 0x0f; /* convert EBCDIC */
265 msg[0] |= 0x30; /* to ASCII (digit) */
266 msg[1] = '?';
267 break;
268 }
269 sclp_print(msg);
270 print_volser(vlbl->volser);
271 }
272
273 static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
274 {
275 block_number_t block_nr;
276 BootInfo *bip = (void *)(sec + 0x70); /* BootInfo is MBR for LDL */
277
278 if (mode != ECKD_LDL_UNLABELED) {
279 print_eckd_ldl_msg(mode);
280 }
281
282 /* DO NOT read BootMap pointer (only one, xECKD) at block #2 */
283
284 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
285 read_block(0, sec, "Cannot read block 0 to grab boot info.");
286 if (mode == ECKD_LDL_UNLABELED) {
287 if (!magic_match(bip->magic, ZIPL_MAGIC)) {
288 return; /* not applicable layout */
289 }
290 sclp_print("unlabeled LDL.\n");
291 }
292 verify_boot_info(bip);
293
294 block_nr = eckd_block_num((void *)&(bip->bp.ipl.bm_ptr.eckd.bptr));
295 run_eckd_boot_script(block_nr);
296 /* no return */
297 }
298
299 static void print_eckd_msg(void)
300 {
301 char msg[] = "Using ECKD scheme (block size *****), ";
302 char *p = &msg[34], *q = &msg[30];
303 int n = virtio_get_block_size();
304
305 /* Fill in the block size and show up the message */
306 if (n > 0 && n <= 99999) {
307 while (n) {
308 *p-- = '0' + (n % 10);
309 n /= 10;
310 }
311 while (p >= q) {
312 *p-- = ' ';
313 }
314 }
315 sclp_print(msg);
316 }
317
318 static void ipl_eckd(void)
319 {
320 ScsiMbr *mbr = (void *)sec;
321 LDL_VTOC *vlbl = (void *)sec;
322
323 print_eckd_msg();
324
325 /* Grab the MBR again */
326 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
327 read_block(0, mbr, "Cannot read block 0 on DASD");
328
329 if (magic_match(mbr->magic, IPL1_MAGIC)) {
330 ipl_eckd_cdl(); /* no return */
331 }
332
333 /* LDL/CMS? */
334 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
335 read_block(2, vlbl, "Cannot read block 2");
336
337 if (magic_match(vlbl->magic, CMS1_MAGIC)) {
338 ipl_eckd_ldl(ECKD_CMS); /* no return */
339 }
340 if (magic_match(vlbl->magic, LNX1_MAGIC)) {
341 ipl_eckd_ldl(ECKD_LDL); /* no return */
342 }
343
344 ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */
345 /*
346 * Ok, it is not a LDL by any means.
347 * It still might be a CDL with zero record keys for IPL1 and IPL2
348 */
349 ipl_eckd_cdl();
350 }
351
352 /***********************************************************************
353 * IPL a SCSI disk
354 */
355
356 static void zipl_load_segment(ComponentEntry *entry)
357 {
358 const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr));
359 ScsiBlockPtr *bprs = (void *)sec;
360 const int bprs_size = sizeof(sec);
361 block_number_t blockno;
362 uint64_t address;
363 int i;
364 char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ";
365 char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */
366
367 blockno = entry->data.blockno;
368 address = entry->load_address;
369
370 debug_print_int("loading segment at block", blockno);
371 debug_print_int("addr", address);
372
373 do {
374 memset(bprs, FREE_SPACE_FILLER, bprs_size);
375 fill_hex_val(blk_no, &blockno, sizeof(blockno));
376 read_block(blockno, bprs, err_msg);
377
378 for (i = 0;; i++) {
379 uint64_t *cur_desc = (void *)&bprs[i];
380
381 blockno = bprs[i].blockno;
382 if (!blockno) {
383 break;
384 }
385
386 /* we need the updated blockno for the next indirect entry in the
387 chain, but don't want to advance address */
388 if (i == (max_entries - 1)) {
389 break;
390 }
391
392 if (bprs[i].blockct == 0 && unused_space(&bprs[i + 1],
393 sizeof(ScsiBlockPtr))) {
394 /* This is a "continue" pointer.
395 * This ptr is the last one in the current script section.
396 * I.e. the next ptr must point to the unused memory area.
397 * The blockno is not zero, so the upper loop must continue
398 * reading next section of BPRS.
399 */
400 break;
401 }
402 address = virtio_load_direct(cur_desc[0], cur_desc[1], 0,
403 (void *)address);
404 IPL_assert(address != -1, "zIPL load segment failed");
405 }
406 } while (blockno);
407 }
408
409 /* Run a zipl program */
410 static void zipl_run(ScsiBlockPtr *pte)
411 {
412 ComponentHeader *header;
413 ComponentEntry *entry;
414 uint8_t tmp_sec[MAX_SECTOR_SIZE];
415
416 read_block(pte->blockno, tmp_sec, "Cannot read header");
417 header = (ComponentHeader *)tmp_sec;
418
419 IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header");
420 IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type");
421
422 dputs("start loading images\n");
423
424 /* Load image(s) into RAM */
425 entry = (ComponentEntry *)(&header[1]);
426 while (entry->component_type == ZIPL_COMP_ENTRY_LOAD) {
427 zipl_load_segment(entry);
428
429 entry++;
430
431 IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE),
432 "Wrong entry value");
433 }
434
435 IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry");
436
437 /* should not return */
438 jump_to_IPL_code(entry->load_address);
439 }
440
441 static void ipl_scsi(void)
442 {
443 ScsiMbr *mbr = (void *)sec;
444 uint8_t *ns, *ns_end;
445 int program_table_entries = 0;
446 const int pte_len = sizeof(ScsiBlockPtr);
447 ScsiBlockPtr *prog_table_entry;
448
449 /* Grab the MBR */
450 memset(sec, FREE_SPACE_FILLER, sizeof(sec));
451 read_block(0, mbr, "Cannot read block 0");
452
453 if (!magic_match(mbr->magic, ZIPL_MAGIC)) {
454 return;
455 }
456
457 sclp_print("Using SCSI scheme.\n");
458 debug_print_int("MBR Version", mbr->version_id);
459 IPL_check(mbr->version_id == 1,
460 "Unknown MBR layout version, assuming version 1");
461 debug_print_int("program table", mbr->blockptr.blockno);
462 IPL_assert(mbr->blockptr.blockno, "No Program Table");
463
464 /* Parse the program table */
465 read_block(mbr->blockptr.blockno, sec,
466 "Error reading Program Table");
467
468 IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT");
469
470 ns_end = sec + virtio_get_block_size();
471 for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns += pte_len) {
472 prog_table_entry = (ScsiBlockPtr *)ns;
473 if (!prog_table_entry->blockno) {
474 break;
475 }
476
477 program_table_entries++;
478 }
479
480 debug_print_int("program table entries", program_table_entries);
481
482 IPL_assert(program_table_entries != 0, "Empty Program Table");
483
484 /* Run the default entry */
485
486 prog_table_entry = (ScsiBlockPtr *)(sec + pte_len);
487
488 zipl_run(prog_table_entry); /* no return */
489 }
490
491 /***********************************************************************
492 * IPL El Torito ISO9660 image or DVD
493 */
494
495 static bool is_iso_bc_entry_compatible(IsoBcSection *s)
496 {
497 uint8_t *magic_sec = (uint8_t *)(sec + ISO_SECTOR_SIZE);
498
499 if (s->unused || !s->sector_count) {
500 return false;
501 }
502 read_iso_sector(bswap32(s->load_rba), magic_sec,
503 "Failed to read image sector 0");
504
505 /* Checking bytes 8 - 32 for S390 Linux magic */
506 return !_memcmp(magic_sec + 8, linux_s390_magic, 24);
507 }
508
509 /* Location of the current sector of the directory */
510 static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH];
511 /* Offset in the current sector of the directory */
512 static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH];
513 /* Remained directory space in bytes */
514 static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH];
515
516 static inline uint32_t iso_get_file_size(uint32_t load_rba)
517 {
518 IsoVolDesc *vd = (IsoVolDesc *)sec;
519 IsoDirHdr *cur_record = &vd->vd.primary.rootdir;
520 uint8_t *temp = sec + ISO_SECTOR_SIZE;
521 int level = 0;
522
523 read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec,
524 "Failed to read ISO primary descriptor");
525 sec_loc[0] = iso_733_to_u32(cur_record->ext_loc);
526 dir_rem[0] = 0;
527 sec_offset[0] = 0;
528
529 while (level >= 0) {
530 IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE,
531 "Directory tree structure violation");
532
533 cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
534
535 if (sec_offset[level] == 0) {
536 read_iso_sector(sec_loc[level], temp,
537 "Failed to read ISO directory");
538 if (dir_rem[level] == 0) {
539 /* Skip self and parent records */
540 dir_rem[level] = iso_733_to_u32(cur_record->data_len) -
541 cur_record->dr_len;
542 sec_offset[level] += cur_record->dr_len;
543
544 cur_record = (IsoDirHdr *)(temp + sec_offset[level]);
545 dir_rem[level] -= cur_record->dr_len;
546 sec_offset[level] += cur_record->dr_len;
547 continue;
548 }
549 }
550
551 if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) {
552 /* Zero-padding and/or the end of current sector */
553 dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level];
554 sec_offset[level] = 0;
555 sec_loc[level]++;
556 } else {
557 /* The directory record is valid */
558 if (load_rba == iso_733_to_u32(cur_record->ext_loc)) {
559 return iso_733_to_u32(cur_record->data_len);
560 }
561
562 dir_rem[level] -= cur_record->dr_len;
563 sec_offset[level] += cur_record->dr_len;
564
565 if (cur_record->file_flags & 0x2) {
566 /* Subdirectory */
567 if (level == ISO9660_MAX_DIR_DEPTH - 1) {
568 sclp_print("ISO-9660 directory depth limit exceeded\n");
569 } else {
570 level++;
571 sec_loc[level] = iso_733_to_u32(cur_record->ext_loc);
572 sec_offset[level] = 0;
573 dir_rem[level] = 0;
574 continue;
575 }
576 }
577 }
578
579 if (dir_rem[level] == 0) {
580 /* Nothing remaining */
581 level--;
582 read_iso_sector(sec_loc[level], temp,
583 "Failed to read ISO directory");
584 }
585 }
586
587 return 0;
588 }
589
590 static void load_iso_bc_entry(IsoBcSection *load)
591 {
592 IsoBcSection s = *load;
593 /*
594 * According to spec, extent for each file
595 * is padded and ISO_SECTOR_SIZE bytes aligned
596 */
597 uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT;
598 uint32_t real_size = iso_get_file_size(bswap32(s.load_rba));
599
600 if (real_size) {
601 /* Round up blocks to load */
602 blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE;
603 sclp_print("ISO boot image size verified\n");
604 } else {
605 sclp_print("ISO boot image size could not be verified\n");
606 }
607
608 read_iso_boot_image(bswap32(s.load_rba),
609 (void *)((uint64_t)bswap16(s.load_segment)),
610 blks_to_load);
611
612 /* Trying to get PSW at zero address */
613 if (*((uint64_t *)0) & IPL_PSW_MASK) {
614 jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff);
615 }
616
617 /* Try default linux start address */
618 jump_to_IPL_code(KERN_IMAGE_START);
619 }
620
621 static uint32_t find_iso_bc(void)
622 {
623 IsoVolDesc *vd = (IsoVolDesc *)sec;
624 uint32_t block_num = ISO_PRIMARY_VD_SECTOR;
625
626 if (virtio_read_many(block_num++, sec, 1)) {
627 /* If primary vd cannot be read, there is no boot catalog */
628 return 0;
629 }
630
631 while (is_iso_vd_valid(vd) && vd->type != VOL_DESC_TERMINATOR) {
632 if (vd->type == VOL_DESC_TYPE_BOOT) {
633 IsoVdElTorito *et = &vd->vd.boot;
634
635 if (!_memcmp(&et->el_torito[0], el_torito_magic, 32)) {
636 return bswap32(et->bc_offset);
637 }
638 }
639 read_iso_sector(block_num++, sec,
640 "Failed to read ISO volume descriptor");
641 }
642
643 return 0;
644 }
645
646 static IsoBcSection *find_iso_bc_entry(void)
647 {
648 IsoBcEntry *e = (IsoBcEntry *)sec;
649 uint32_t offset = find_iso_bc();
650 int i;
651
652 if (!offset) {
653 return NULL;
654 }
655
656 read_iso_sector(offset, sec, "Failed to read El Torito boot catalog");
657
658 if (!is_iso_bc_valid(e)) {
659 /* The validation entry is mandatory */
660 panic("No valid boot catalog found!\n");
661 return NULL;
662 }
663
664 /*
665 * Each entry has 32 bytes size, so one sector cannot contain > 64 entries.
666 * We consider only boot catalogs with no more than 64 entries.
667 */
668 for (i = 1; i < ISO_BC_ENTRY_PER_SECTOR; i++) {
669 if (e[i].id == ISO_BC_BOOTABLE_SECTION) {
670 if (is_iso_bc_entry_compatible(&e[i].body.sect)) {
671 return &e[i].body.sect;
672 }
673 }
674 }
675
676 panic("No suitable boot entry found on ISO-9660 media!\n");
677
678 return NULL;
679 }
680
681 static void ipl_iso_el_torito(void)
682 {
683 IsoBcSection *s = find_iso_bc_entry();
684
685 if (s) {
686 load_iso_bc_entry(s);
687 /* no return */
688 }
689 }
690
691 /***********************************************************************
692 * Bus specific IPL sequences
693 */
694
695 static void zipl_load_vblk(void)
696 {
697 if (virtio_guessed_disk_nature()) {
698 virtio_assume_iso9660();
699 }
700 ipl_iso_el_torito();
701
702 if (virtio_guessed_disk_nature()) {
703 sclp_print("Using guessed DASD geometry.\n");
704 virtio_assume_eckd();
705 }
706 ipl_eckd();
707 }
708
709 static void zipl_load_vscsi(void)
710 {
711 if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) {
712 /* Is it an ISO image in non-CD drive? */
713 ipl_iso_el_torito();
714 }
715
716 sclp_print("Using guessed DASD geometry.\n");
717 virtio_assume_eckd();
718 ipl_eckd();
719 }
720
721 /***********************************************************************
722 * IPL starts here
723 */
724
725 void zipl_load(void)
726 {
727 VDev *vdev = virtio_get_device();
728
729 if (vdev->is_cdrom) {
730 ipl_iso_el_torito();
731 panic("\n! Cannot IPL this ISO image !\n");
732 }
733
734 if (virtio_get_device_type() == VIRTIO_ID_NET) {
735 jump_to_IPL_code(vdev->netboot_start_addr);
736 }
737
738 ipl_scsi();
739
740 switch (virtio_get_device_type()) {
741 case VIRTIO_ID_BLOCK:
742 zipl_load_vblk();
743 break;
744 case VIRTIO_ID_SCSI:
745 zipl_load_vscsi();
746 break;
747 default:
748 panic("\n! Unknown IPL device type !\n");
749 }
750
751 panic("\n* this can never happen *\n");
752 }