18
19#include <sys/param.h>
20#include <sys/errno.h>
21#include <sys/diskmbr.h>
22#ifdef GPT
23#include <sys/gpt.h>
24#endif
25#include <sys/reboot.h>
26#include <sys/queue.h>
27
28#include <machine/bootinfo.h>
29#include <machine/elf.h>
30#include <machine/pc/bios.h>
31
32#include <stdarg.h>
33#include <stddef.h>
34
35#include <a.out.h>
36
37#include <btxv86.h>
38
39#include "lib.h"
40#include "rbx.h"
41#include "drv.h"
42#include "util.h"
43#include "cons.h"
44#include "bootargs.h"
45
46#include "libzfs.h"
47
48#define PATH_DOTCONFIG "/boot.config"
49#define PATH_CONFIG "/boot/config"
50#define PATH_BOOT3 "/boot/zfsloader"
51#define PATH_KERNEL "/boot/kernel/kernel"
52
53#define ARGS 0x900
54#define NOPT 14
55#define NDEV 3
56
57#define BIOS_NUMDRIVES 0x475
58#define DRV_HARD 0x80
59#define DRV_MASK 0x7f
60
61#define TYPE_AD 0
62#define TYPE_DA 1
63#define TYPE_MAXHARD TYPE_DA
64#define TYPE_FD 2
65
66extern uint32_t _end;
67
68#ifdef GPT
69static const uuid_t freebsd_zfs_uuid = GPT_ENT_TYPE_FREEBSD_ZFS;
70#endif
71static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
72static const unsigned char flags[NOPT] = {
73 RBX_DUAL,
74 RBX_SERIAL,
75 RBX_ASKNAME,
76 RBX_CDROM,
77 RBX_CONFIG,
78 RBX_KDB,
79 RBX_GDB,
80 RBX_MUTE,
81 RBX_NOINTR,
82 RBX_PAUSE,
83 RBX_QUIET,
84 RBX_DFLTROOT,
85 RBX_SINGLE,
86 RBX_VERBOSE
87};
88uint32_t opts;
89
90static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
91static const unsigned char dev_maj[NDEV] = {30, 4, 2};
92
93static char cmd[512];
94static char cmddup[512];
95static char kname[1024];
96static char rootname[256];
97static int comspeed = SIOSPD;
98static struct bootinfo bootinfo;
99static uint32_t bootdev;
100static struct zfs_boot_args zfsargs;
101static struct zfsmount zfsmount;
102
103vm_offset_t high_heap_base;
104uint32_t bios_basemem, bios_extmem, high_heap_size;
105
106static struct bios_smap smap;
107
108/*
109 * The minimum amount of memory to reserve in bios_extmem for the heap.
110 */
111#define HEAP_MIN (3 * 1024 * 1024)
112
113static char *heap_next;
114static char *heap_end;
115
116/* Buffers that must not span a 64k boundary. */
117#define READ_BUF_SIZE 8192
118struct dmadat {
119 char rdbuf[READ_BUF_SIZE]; /* for reading large things */
120 char secbuf[READ_BUF_SIZE]; /* for MBR/disklabel */
121};
122static struct dmadat *dmadat;
123
124void exit(int);
125static void load(void);
126static int parse(void);
127static void bios_getmem(void);
128
129static void *
130malloc(size_t n)
131{
132 char *p = heap_next;
133 if (p + n > heap_end) {
134 printf("malloc failure\n");
135 for (;;)
136 ;
137 return 0;
138 }
139 heap_next += n;
140 return p;
141}
142
143static char *
144strdup(const char *s)
145{
146 char *p = malloc(strlen(s) + 1);
147 strcpy(p, s);
148 return p;
149}
150
151#include "zfsimpl.c"
152
153/*
154 * Read from a dnode (which must be from a ZPL filesystem).
155 */
156static int
157zfs_read(spa_t *spa, const dnode_phys_t *dnode, off_t *offp, void *start, size_t size)
158{
159 const znode_phys_t *zp = (const znode_phys_t *) dnode->dn_bonus;
160 size_t n;
161 int rc;
162
163 n = size;
164 if (*offp + n > zp->zp_size)
165 n = zp->zp_size - *offp;
166
167 rc = dnode_read(spa, dnode, *offp, start, n);
168 if (rc)
169 return (-1);
170 *offp += n;
171
172 return (n);
173}
174
175/*
176 * Current ZFS pool
177 */
178static spa_t *spa;
179static spa_t *primary_spa;
180static vdev_t *primary_vdev;
181
182/*
183 * A wrapper for dskread that doesn't have to worry about whether the
184 * buffer pointer crosses a 64k boundary.
185 */
186static int
187vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes)
188{
189 char *p;
190 daddr_t lba;
191 unsigned int nb;
192 struct dsk *dsk = (struct dsk *) priv;
193
194 if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1)))
195 return -1;
196
197 p = buf;
198 lba = off / DEV_BSIZE;
199 lba += dsk->start;
200 while (bytes > 0) {
201 nb = bytes / DEV_BSIZE;
202 if (nb > READ_BUF_SIZE / DEV_BSIZE)
203 nb = READ_BUF_SIZE / DEV_BSIZE;
204 if (drvread(dsk, dmadat->rdbuf, lba, nb))
205 return -1;
206 memcpy(p, dmadat->rdbuf, nb * DEV_BSIZE);
207 p += nb * DEV_BSIZE;
208 lba += nb;
209 bytes -= nb * DEV_BSIZE;
210 }
211
212 return 0;
213}
214
215static int
216xfsread(const dnode_phys_t *dnode, off_t *offp, void *buf, size_t nbyte)
217{
218 if ((size_t)zfs_read(spa, dnode, offp, buf, nbyte) != nbyte) {
219 printf("Invalid format\n");
220 return -1;
221 }
222 return 0;
223}
224
225static void
226bios_getmem(void)
227{
228 uint64_t size;
229
230 /* Parse system memory map */
231 v86.ebx = 0;
232 do {
233 v86.ctl = V86_FLAGS;
234 v86.addr = 0x15; /* int 0x15 function 0xe820*/
235 v86.eax = 0xe820;
236 v86.ecx = sizeof(struct bios_smap);
237 v86.edx = SMAP_SIG;
238 v86.es = VTOPSEG(&smap);
239 v86.edi = VTOPOFF(&smap);
240 v86int();
241 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
242 break;
243 /* look for a low-memory segment that's large enough */
244 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) &&
245 (smap.length >= (512 * 1024)))
246 bios_basemem = smap.length;
247 /* look for the first segment in 'extended' memory */
248 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) {
249 bios_extmem = smap.length;
250 }
251
252 /*
253 * Look for the largest segment in 'extended' memory beyond
254 * 1MB but below 4GB.
255 */
256 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) &&
257 (smap.base < 0x100000000ull)) {
258 size = smap.length;
259
260 /*
261 * If this segment crosses the 4GB boundary, truncate it.
262 */
263 if (smap.base + size > 0x100000000ull)
264 size = 0x100000000ull - smap.base;
265
266 if (size > high_heap_size) {
267 high_heap_size = size;
268 high_heap_base = smap.base;
269 }
270 }
271 } while (v86.ebx != 0);
272
273 /* Fall back to the old compatibility function for base memory */
274 if (bios_basemem == 0) {
275 v86.ctl = 0;
276 v86.addr = 0x12; /* int 0x12 */
277 v86int();
278
279 bios_basemem = (v86.eax & 0xffff) * 1024;
280 }
281
282 /* Fall back through several compatibility functions for extended memory */
283 if (bios_extmem == 0) {
284 v86.ctl = V86_FLAGS;
285 v86.addr = 0x15; /* int 0x15 function 0xe801*/
286 v86.eax = 0xe801;
287 v86int();
288 if (!(v86.efl & 1)) {
289 bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024;
290 }
291 }
292 if (bios_extmem == 0) {
293 v86.ctl = 0;
294 v86.addr = 0x15; /* int 0x15 function 0x88*/
295 v86.eax = 0x8800;
296 v86int();
297 bios_extmem = (v86.eax & 0xffff) * 1024;
298 }
299
300 /*
301 * If we have extended memory and did not find a suitable heap
302 * region in the SMAP, use the last 3MB of 'extended' memory as a
303 * high heap candidate.
304 */
305 if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
306 high_heap_size = HEAP_MIN;
307 high_heap_base = bios_extmem + 0x100000 - HEAP_MIN;
308 }
309}
310
311/*
312 * Try to detect a device supported by the legacy int13 BIOS
313 */
314static int
315int13probe(int drive)
316{
317 v86.ctl = V86_FLAGS;
318 v86.addr = 0x13;
319 v86.eax = 0x800;
320 v86.edx = drive;
321 v86int();
322
323 if (!(v86.efl & 0x1) && /* carry clear */
324 ((v86.edx & 0xff) != (drive & DRV_MASK))) { /* unit # OK */
325 if ((v86.ecx & 0x3f) == 0) { /* absurd sector size */
326 return(0); /* skip device */
327 }
328 return (1);
329 }
330 return(0);
331}
332
333/*
334 * We call this when we find a ZFS vdev - ZFS consumes the dsk
335 * structure so we must make a new one.
336 */
337static struct dsk *
338copy_dsk(struct dsk *dsk)
339{
340 struct dsk *newdsk;
341
342 newdsk = malloc(sizeof(struct dsk));
343 *newdsk = *dsk;
344 return (newdsk);
345}
346
347static void
348probe_drive(struct dsk *dsk)
349{
350#ifdef GPT
351 struct gpt_hdr hdr;
352 struct gpt_ent *ent;
353 daddr_t slba, elba;
354 unsigned part, entries_per_sec;
355#endif
356 struct dos_partition *dp;
357 char *sec;
358 unsigned i;
359
360 /*
361 * If we find a vdev on the whole disk, stop here. Otherwise dig
362 * out the partition table and probe each slice/partition
363 * in turn for a vdev.
364 */
365 if (vdev_probe(vdev_read, dsk, NULL) == 0)
366 return;
367
368 sec = dmadat->secbuf;
369 dsk->start = 0;
370
371#ifdef GPT
372 /*
373 * First check for GPT.
374 */
375 if (drvread(dsk, sec, 1, 1)) {
376 return;
377 }
378 memcpy(&hdr, sec, sizeof(hdr));
379 if (memcmp(hdr.hdr_sig, GPT_HDR_SIG, sizeof(hdr.hdr_sig)) != 0 ||
380 hdr.hdr_lba_self != 1 || hdr.hdr_revision < 0x00010000 ||
381 hdr.hdr_entsz < sizeof(*ent) || DEV_BSIZE % hdr.hdr_entsz != 0) {
382 goto trymbr;
383 }
384
385 /*
386 * Probe all GPT partitions for the presense of ZFS pools. We
387 * return the spa_t for the first we find (if requested). This
388 * will have the effect of booting from the first pool on the
389 * disk.
390 */
391 entries_per_sec = DEV_BSIZE / hdr.hdr_entsz;
392 slba = hdr.hdr_lba_table;
393 elba = slba + hdr.hdr_entries / entries_per_sec;
394 while (slba < elba) {
395 dsk->start = 0;
396 if (drvread(dsk, sec, slba, 1))
397 return;
398 for (part = 0; part < entries_per_sec; part++) {
399 ent = (struct gpt_ent *)(sec + part * hdr.hdr_entsz);
400 if (memcmp(&ent->ent_type, &freebsd_zfs_uuid,
401 sizeof(uuid_t)) == 0) {
402 dsk->start = ent->ent_lba_start;
403 if (vdev_probe(vdev_read, dsk, NULL) == 0) {
404 /*
405 * This slice had a vdev. We need a new dsk
406 * structure now since the vdev now owns this one.
407 */
408 dsk = copy_dsk(dsk);
409 }
410 }
411 }
412 slba++;
413 }
414 return;
415trymbr:
416#endif
417
418 if (drvread(dsk, sec, DOSBBSECTOR, 1))
419 return;
420 dp = (void *)(sec + DOSPARTOFF);
421
422 for (i = 0; i < NDOSPART; i++) {
423 if (!dp[i].dp_typ)
424 continue;
425 dsk->start = dp[i].dp_start;
426 if (vdev_probe(vdev_read, dsk, NULL) == 0) {
427 /*
428 * This slice had a vdev. We need a new dsk structure now
429 * since the vdev now owns this one.
430 */
431 dsk = copy_dsk(dsk);
432 }
433 }
434}
435
436int
437main(void)
438{
439 int autoboot, i;
440 dnode_phys_t dn;
441 off_t off;
442 struct dsk *dsk;
443
444 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
445
446 bios_getmem();
447
448 if (high_heap_size > 0) {
449 heap_end = PTOV(high_heap_base + high_heap_size);
450 heap_next = PTOV(high_heap_base);
451 } else {
452 heap_next = (char *) dmadat + sizeof(*dmadat);
453 heap_end = (char *) PTOV(bios_basemem);
454 }
455
456 dsk = malloc(sizeof(struct dsk));
457 dsk->drive = *(uint8_t *)PTOV(ARGS);
458 dsk->type = dsk->drive & DRV_HARD ? TYPE_AD : TYPE_FD;
459 dsk->unit = dsk->drive & DRV_MASK;
460 dsk->slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
461 dsk->part = 0;
462 dsk->start = 0;
463 dsk->init = 0;
464
465 bootinfo.bi_version = BOOTINFO_VERSION;
466 bootinfo.bi_size = sizeof(bootinfo);
467 bootinfo.bi_basemem = bios_basemem / 1024;
468 bootinfo.bi_extmem = bios_extmem / 1024;
469 bootinfo.bi_memsizes_valid++;
470 bootinfo.bi_bios_dev = dsk->drive;
471
472 bootdev = MAKEBOOTDEV(dev_maj[dsk->type],
473 dsk->slice, dsk->unit, dsk->part),
474
475 /* Process configuration file */
476
477 autoboot = 1;
478
479 zfs_init();
480
481 /*
482 * Probe the boot drive first - we will try to boot from whatever
483 * pool we find on that drive.
484 */
485 probe_drive(dsk);
486
487 /*
488 * Probe the rest of the drives that the bios knows about. This
489 * will find any other available pools and it may fill in missing
490 * vdevs for the boot pool.
491 */
492#ifndef VIRTUALBOX
493 for (i = 0; i < *(unsigned char *)PTOV(BIOS_NUMDRIVES); i++)
494#else
495 for (i = 0; i < MAXBDDEV; i++)
496#endif
497 {
498 if ((i | DRV_HARD) == *(uint8_t *)PTOV(ARGS))
499 continue;
500
501 if (!int13probe(i | DRV_HARD))
502 break;
503
504 dsk = malloc(sizeof(struct dsk));
505 dsk->drive = i | DRV_HARD;
506 dsk->type = dsk->drive & TYPE_AD;
507 dsk->unit = i;
508 dsk->slice = 0;
509 dsk->part = 0;
510 dsk->start = 0;
511 dsk->init = 0;
512 probe_drive(dsk);
513 }
514
515 /*
516 * The first discovered pool, if any, is the pool.
517 */
518 spa = spa_get_primary();
519 if (!spa) {
520 printf("%s: No ZFS pools located, can't boot\n", BOOTPROG);
521 for (;;)
522 ;
523 }
524
525 primary_spa = spa;
526 primary_vdev = spa_get_primary_vdev(spa);
527
528 if (zfs_spa_init(spa) != 0 || zfs_mount(spa, 0, &zfsmount) != 0) {
529 printf("%s: failed to mount default pool %s\n",
530 BOOTPROG, spa->spa_name);
531 autoboot = 0;
532 } else if (zfs_lookup(&zfsmount, PATH_CONFIG, &dn) == 0 ||
533 zfs_lookup(&zfsmount, PATH_DOTCONFIG, &dn) == 0) {
534 off = 0;
535 zfs_read(spa, &dn, &off, cmd, sizeof(cmd));
536 }
537
538 if (*cmd) {
539 /*
540 * Note that parse() is destructive to cmd[] and we also want
541 * to honor RBX_QUIET option that could be present in cmd[].
542 */
543 memcpy(cmddup, cmd, sizeof(cmd));
544 if (parse())
545 autoboot = 0;
546 if (!OPT_CHECK(RBX_QUIET))
547 printf("%s: %s\n", PATH_CONFIG, cmddup);
548 /* Do not process this command twice */
549 *cmd = 0;
550 }
551
552 /*
553 * Try to exec stage 3 boot loader. If interrupted by a keypress,
554 * or in case of failure, try to load a kernel directly instead.
555 */
556
557 if (autoboot && !*kname) {
558 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
559 if (!keyhit(3)) {
560 load();
561 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
562 }
563 }
564
565 /* Present the user with the boot2 prompt. */
566
567 for (;;) {
568 if (!autoboot || !OPT_CHECK(RBX_QUIET)) {
569 printf("\nFreeBSD/x86 boot\n");
570 if (zfs_rlookup(spa, zfsmount.rootobj, rootname) != 0)
571 printf("Default: %s/<0x%llx>:%s\n"
572 "boot: ",
573 spa->spa_name, zfsmount.rootobj, kname);
574 else if (rootname[0] != '\0')
575 printf("Default: %s/%s:%s\n"
576 "boot: ",
577 spa->spa_name, rootname, kname);
578 else
579 printf("Default: %s:%s\n"
580 "boot: ",
581 spa->spa_name, kname);
582 }
583 if (ioctrl & IO_SERIAL)
584 sio_flush();
585 if (!autoboot || keyhit(5))
586 getstr(cmd, sizeof(cmd));
587 else if (!autoboot || !OPT_CHECK(RBX_QUIET))
588 putchar('\n');
589 autoboot = 0;
590 if (parse())
591 putchar('\a');
592 else
593 load();
594 }
595}
596
597/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
598void
599exit(int x)
600{
601}
602
603static void
604load(void)
605{
606 union {
607 struct exec ex;
608 Elf32_Ehdr eh;
609 } hdr;
610 static Elf32_Phdr ep[2];
611 static Elf32_Shdr es[2];
612 caddr_t p;
613 dnode_phys_t dn;
614 off_t off;
615 uint32_t addr, x;
616 int fmt, i, j;
617
618 if (zfs_lookup(&zfsmount, kname, &dn)) {
619 printf("\nCan't find %s\n", kname);
620 return;
621 }
622 off = 0;
623 if (xfsread(&dn, &off, &hdr, sizeof(hdr)))
624 return;
625 if (N_GETMAGIC(hdr.ex) == ZMAGIC)
626 fmt = 0;
627 else if (IS_ELF(hdr.eh))
628 fmt = 1;
629 else {
630 printf("Invalid %s\n", "format");
631 return;
632 }
633 if (fmt == 0) {
634 addr = hdr.ex.a_entry & 0xffffff;
635 p = PTOV(addr);
636 off = PAGE_SIZE;
637 if (xfsread(&dn, &off, p, hdr.ex.a_text))
638 return;
639 p += roundup2(hdr.ex.a_text, PAGE_SIZE);
640 if (xfsread(&dn, &off, p, hdr.ex.a_data))
641 return;
642 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
643 bootinfo.bi_symtab = VTOP(p);
644 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
645 p += sizeof(hdr.ex.a_syms);
646 if (hdr.ex.a_syms) {
647 if (xfsread(&dn, &off, p, hdr.ex.a_syms))
648 return;
649 p += hdr.ex.a_syms;
650 if (xfsread(&dn, &off, p, sizeof(int)))
651 return;
652 x = *(uint32_t *)p;
653 p += sizeof(int);
654 x -= sizeof(int);
655 if (xfsread(&dn, &off, p, x))
656 return;
657 p += x;
658 }
659 } else {
660 off = hdr.eh.e_phoff;
661 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
662 if (xfsread(&dn, &off, ep + j, sizeof(ep[0])))
663 return;
664 if (ep[j].p_type == PT_LOAD)
665 j++;
666 }
667 for (i = 0; i < 2; i++) {
668 p = PTOV(ep[i].p_paddr & 0xffffff);
669 off = ep[i].p_offset;
670 if (xfsread(&dn, &off, p, ep[i].p_filesz))
671 return;
672 }
673 p += roundup2(ep[1].p_memsz, PAGE_SIZE);
674 bootinfo.bi_symtab = VTOP(p);
675 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
676 off = hdr.eh.e_shoff + sizeof(es[0]) *
677 (hdr.eh.e_shstrndx + 1);
678 if (xfsread(&dn, &off, &es, sizeof(es)))
679 return;
680 for (i = 0; i < 2; i++) {
681 memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
682 p += sizeof(es[i].sh_size);
683 off = es[i].sh_offset;
684 if (xfsread(&dn, &off, p, es[i].sh_size))
685 return;
686 p += es[i].sh_size;
687 }
688 }
689 addr = hdr.eh.e_entry & 0xffffff;
690 }
691 bootinfo.bi_esymtab = VTOP(p);
692 bootinfo.bi_kernelname = VTOP(kname);
693 zfsargs.size = sizeof(zfsargs);
694 zfsargs.pool = zfsmount.spa->spa_guid;
695 zfsargs.root = zfsmount.rootobj;
696 zfsargs.primary_pool = primary_spa->spa_guid;
697 if (primary_vdev != NULL)
698 zfsargs.primary_vdev = primary_vdev->v_guid;
699 else
700 printf("failed to detect primary vdev\n");
701 __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
702 bootdev,
703 KARGS_FLAGS_ZFS | KARGS_FLAGS_EXTARG,
704 (uint32_t) spa->spa_guid,
705 (uint32_t) (spa->spa_guid >> 32),
706 VTOP(&bootinfo),
707 zfsargs);
708}
709
710static int
711zfs_mount_ds(char *dsname)
712{
713 uint64_t newroot;
714 spa_t *newspa;
715 char *q;
716
717 q = strchr(dsname, '/');
718 if (q)
719 *q++ = '\0';
720 newspa = spa_find_by_name(dsname);
721 if (newspa == NULL) {
722 printf("\nCan't find ZFS pool %s\n", dsname);
723 return -1;
724 }
725
726 if (zfs_spa_init(newspa))
727 return -1;
728
729 newroot = 0;
730 if (q) {
731 if (zfs_lookup_dataset(newspa, q, &newroot)) {
732 printf("\nCan't find dataset %s in ZFS pool %s\n",
733 q, newspa->spa_name);
734 return -1;
735 }
736 }
737 if (zfs_mount(newspa, newroot, &zfsmount)) {
738 printf("\nCan't mount ZFS dataset\n");
739 return -1;
740 }
741 spa = newspa;
742 return (0);
743}
744
745static int
746parse(void)
747{
748 char *arg = cmd;
749 char *ep, *p, *q;
750 const char *cp;
751 int c, i, j;
752
753 while ((c = *arg++)) {
754 if (c == ' ' || c == '\t' || c == '\n')
755 continue;
756 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
757 ep = p;
758 if (*p)
759 *p++ = 0;
760 if (c == '-') {
761 while ((c = *arg++)) {
762 if (c == 'P') {
763 if (*(uint8_t *)PTOV(0x496) & 0x10) {
764 cp = "yes";
765 } else {
766 opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
767 cp = "no";
768 }
769 printf("Keyboard: %s\n", cp);
770 continue;
771 } else if (c == 'S') {
772 j = 0;
773 while ((unsigned int)(i = *arg++ - '0') <= 9)
774 j = j * 10 + i;
775 if (j > 0 && i == -'0') {
776 comspeed = j;
777 break;
778 }
779 /* Fall through to error below ('S' not in optstr[]). */
780 }
781 for (i = 0; c != optstr[i]; i++)
782 if (i == NOPT - 1)
783 return -1;
784 opts ^= OPT_SET(flags[i]);
785 }
786 ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
787 OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
| 18
19#include <sys/param.h>
20#include <sys/errno.h>
21#include <sys/diskmbr.h>
22#ifdef GPT
23#include <sys/gpt.h>
24#endif
25#include <sys/reboot.h>
26#include <sys/queue.h>
27
28#include <machine/bootinfo.h>
29#include <machine/elf.h>
30#include <machine/pc/bios.h>
31
32#include <stdarg.h>
33#include <stddef.h>
34
35#include <a.out.h>
36
37#include <btxv86.h>
38
39#include "lib.h"
40#include "rbx.h"
41#include "drv.h"
42#include "util.h"
43#include "cons.h"
44#include "bootargs.h"
45
46#include "libzfs.h"
47
48#define PATH_DOTCONFIG "/boot.config"
49#define PATH_CONFIG "/boot/config"
50#define PATH_BOOT3 "/boot/zfsloader"
51#define PATH_KERNEL "/boot/kernel/kernel"
52
53#define ARGS 0x900
54#define NOPT 14
55#define NDEV 3
56
57#define BIOS_NUMDRIVES 0x475
58#define DRV_HARD 0x80
59#define DRV_MASK 0x7f
60
61#define TYPE_AD 0
62#define TYPE_DA 1
63#define TYPE_MAXHARD TYPE_DA
64#define TYPE_FD 2
65
66extern uint32_t _end;
67
68#ifdef GPT
69static const uuid_t freebsd_zfs_uuid = GPT_ENT_TYPE_FREEBSD_ZFS;
70#endif
71static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
72static const unsigned char flags[NOPT] = {
73 RBX_DUAL,
74 RBX_SERIAL,
75 RBX_ASKNAME,
76 RBX_CDROM,
77 RBX_CONFIG,
78 RBX_KDB,
79 RBX_GDB,
80 RBX_MUTE,
81 RBX_NOINTR,
82 RBX_PAUSE,
83 RBX_QUIET,
84 RBX_DFLTROOT,
85 RBX_SINGLE,
86 RBX_VERBOSE
87};
88uint32_t opts;
89
90static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
91static const unsigned char dev_maj[NDEV] = {30, 4, 2};
92
93static char cmd[512];
94static char cmddup[512];
95static char kname[1024];
96static char rootname[256];
97static int comspeed = SIOSPD;
98static struct bootinfo bootinfo;
99static uint32_t bootdev;
100static struct zfs_boot_args zfsargs;
101static struct zfsmount zfsmount;
102
103vm_offset_t high_heap_base;
104uint32_t bios_basemem, bios_extmem, high_heap_size;
105
106static struct bios_smap smap;
107
108/*
109 * The minimum amount of memory to reserve in bios_extmem for the heap.
110 */
111#define HEAP_MIN (3 * 1024 * 1024)
112
113static char *heap_next;
114static char *heap_end;
115
116/* Buffers that must not span a 64k boundary. */
117#define READ_BUF_SIZE 8192
118struct dmadat {
119 char rdbuf[READ_BUF_SIZE]; /* for reading large things */
120 char secbuf[READ_BUF_SIZE]; /* for MBR/disklabel */
121};
122static struct dmadat *dmadat;
123
124void exit(int);
125static void load(void);
126static int parse(void);
127static void bios_getmem(void);
128
129static void *
130malloc(size_t n)
131{
132 char *p = heap_next;
133 if (p + n > heap_end) {
134 printf("malloc failure\n");
135 for (;;)
136 ;
137 return 0;
138 }
139 heap_next += n;
140 return p;
141}
142
143static char *
144strdup(const char *s)
145{
146 char *p = malloc(strlen(s) + 1);
147 strcpy(p, s);
148 return p;
149}
150
151#include "zfsimpl.c"
152
153/*
154 * Read from a dnode (which must be from a ZPL filesystem).
155 */
156static int
157zfs_read(spa_t *spa, const dnode_phys_t *dnode, off_t *offp, void *start, size_t size)
158{
159 const znode_phys_t *zp = (const znode_phys_t *) dnode->dn_bonus;
160 size_t n;
161 int rc;
162
163 n = size;
164 if (*offp + n > zp->zp_size)
165 n = zp->zp_size - *offp;
166
167 rc = dnode_read(spa, dnode, *offp, start, n);
168 if (rc)
169 return (-1);
170 *offp += n;
171
172 return (n);
173}
174
175/*
176 * Current ZFS pool
177 */
178static spa_t *spa;
179static spa_t *primary_spa;
180static vdev_t *primary_vdev;
181
182/*
183 * A wrapper for dskread that doesn't have to worry about whether the
184 * buffer pointer crosses a 64k boundary.
185 */
186static int
187vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes)
188{
189 char *p;
190 daddr_t lba;
191 unsigned int nb;
192 struct dsk *dsk = (struct dsk *) priv;
193
194 if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1)))
195 return -1;
196
197 p = buf;
198 lba = off / DEV_BSIZE;
199 lba += dsk->start;
200 while (bytes > 0) {
201 nb = bytes / DEV_BSIZE;
202 if (nb > READ_BUF_SIZE / DEV_BSIZE)
203 nb = READ_BUF_SIZE / DEV_BSIZE;
204 if (drvread(dsk, dmadat->rdbuf, lba, nb))
205 return -1;
206 memcpy(p, dmadat->rdbuf, nb * DEV_BSIZE);
207 p += nb * DEV_BSIZE;
208 lba += nb;
209 bytes -= nb * DEV_BSIZE;
210 }
211
212 return 0;
213}
214
215static int
216xfsread(const dnode_phys_t *dnode, off_t *offp, void *buf, size_t nbyte)
217{
218 if ((size_t)zfs_read(spa, dnode, offp, buf, nbyte) != nbyte) {
219 printf("Invalid format\n");
220 return -1;
221 }
222 return 0;
223}
224
225static void
226bios_getmem(void)
227{
228 uint64_t size;
229
230 /* Parse system memory map */
231 v86.ebx = 0;
232 do {
233 v86.ctl = V86_FLAGS;
234 v86.addr = 0x15; /* int 0x15 function 0xe820*/
235 v86.eax = 0xe820;
236 v86.ecx = sizeof(struct bios_smap);
237 v86.edx = SMAP_SIG;
238 v86.es = VTOPSEG(&smap);
239 v86.edi = VTOPOFF(&smap);
240 v86int();
241 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
242 break;
243 /* look for a low-memory segment that's large enough */
244 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) &&
245 (smap.length >= (512 * 1024)))
246 bios_basemem = smap.length;
247 /* look for the first segment in 'extended' memory */
248 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) {
249 bios_extmem = smap.length;
250 }
251
252 /*
253 * Look for the largest segment in 'extended' memory beyond
254 * 1MB but below 4GB.
255 */
256 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) &&
257 (smap.base < 0x100000000ull)) {
258 size = smap.length;
259
260 /*
261 * If this segment crosses the 4GB boundary, truncate it.
262 */
263 if (smap.base + size > 0x100000000ull)
264 size = 0x100000000ull - smap.base;
265
266 if (size > high_heap_size) {
267 high_heap_size = size;
268 high_heap_base = smap.base;
269 }
270 }
271 } while (v86.ebx != 0);
272
273 /* Fall back to the old compatibility function for base memory */
274 if (bios_basemem == 0) {
275 v86.ctl = 0;
276 v86.addr = 0x12; /* int 0x12 */
277 v86int();
278
279 bios_basemem = (v86.eax & 0xffff) * 1024;
280 }
281
282 /* Fall back through several compatibility functions for extended memory */
283 if (bios_extmem == 0) {
284 v86.ctl = V86_FLAGS;
285 v86.addr = 0x15; /* int 0x15 function 0xe801*/
286 v86.eax = 0xe801;
287 v86int();
288 if (!(v86.efl & 1)) {
289 bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024;
290 }
291 }
292 if (bios_extmem == 0) {
293 v86.ctl = 0;
294 v86.addr = 0x15; /* int 0x15 function 0x88*/
295 v86.eax = 0x8800;
296 v86int();
297 bios_extmem = (v86.eax & 0xffff) * 1024;
298 }
299
300 /*
301 * If we have extended memory and did not find a suitable heap
302 * region in the SMAP, use the last 3MB of 'extended' memory as a
303 * high heap candidate.
304 */
305 if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
306 high_heap_size = HEAP_MIN;
307 high_heap_base = bios_extmem + 0x100000 - HEAP_MIN;
308 }
309}
310
311/*
312 * Try to detect a device supported by the legacy int13 BIOS
313 */
314static int
315int13probe(int drive)
316{
317 v86.ctl = V86_FLAGS;
318 v86.addr = 0x13;
319 v86.eax = 0x800;
320 v86.edx = drive;
321 v86int();
322
323 if (!(v86.efl & 0x1) && /* carry clear */
324 ((v86.edx & 0xff) != (drive & DRV_MASK))) { /* unit # OK */
325 if ((v86.ecx & 0x3f) == 0) { /* absurd sector size */
326 return(0); /* skip device */
327 }
328 return (1);
329 }
330 return(0);
331}
332
333/*
334 * We call this when we find a ZFS vdev - ZFS consumes the dsk
335 * structure so we must make a new one.
336 */
337static struct dsk *
338copy_dsk(struct dsk *dsk)
339{
340 struct dsk *newdsk;
341
342 newdsk = malloc(sizeof(struct dsk));
343 *newdsk = *dsk;
344 return (newdsk);
345}
346
347static void
348probe_drive(struct dsk *dsk)
349{
350#ifdef GPT
351 struct gpt_hdr hdr;
352 struct gpt_ent *ent;
353 daddr_t slba, elba;
354 unsigned part, entries_per_sec;
355#endif
356 struct dos_partition *dp;
357 char *sec;
358 unsigned i;
359
360 /*
361 * If we find a vdev on the whole disk, stop here. Otherwise dig
362 * out the partition table and probe each slice/partition
363 * in turn for a vdev.
364 */
365 if (vdev_probe(vdev_read, dsk, NULL) == 0)
366 return;
367
368 sec = dmadat->secbuf;
369 dsk->start = 0;
370
371#ifdef GPT
372 /*
373 * First check for GPT.
374 */
375 if (drvread(dsk, sec, 1, 1)) {
376 return;
377 }
378 memcpy(&hdr, sec, sizeof(hdr));
379 if (memcmp(hdr.hdr_sig, GPT_HDR_SIG, sizeof(hdr.hdr_sig)) != 0 ||
380 hdr.hdr_lba_self != 1 || hdr.hdr_revision < 0x00010000 ||
381 hdr.hdr_entsz < sizeof(*ent) || DEV_BSIZE % hdr.hdr_entsz != 0) {
382 goto trymbr;
383 }
384
385 /*
386 * Probe all GPT partitions for the presense of ZFS pools. We
387 * return the spa_t for the first we find (if requested). This
388 * will have the effect of booting from the first pool on the
389 * disk.
390 */
391 entries_per_sec = DEV_BSIZE / hdr.hdr_entsz;
392 slba = hdr.hdr_lba_table;
393 elba = slba + hdr.hdr_entries / entries_per_sec;
394 while (slba < elba) {
395 dsk->start = 0;
396 if (drvread(dsk, sec, slba, 1))
397 return;
398 for (part = 0; part < entries_per_sec; part++) {
399 ent = (struct gpt_ent *)(sec + part * hdr.hdr_entsz);
400 if (memcmp(&ent->ent_type, &freebsd_zfs_uuid,
401 sizeof(uuid_t)) == 0) {
402 dsk->start = ent->ent_lba_start;
403 if (vdev_probe(vdev_read, dsk, NULL) == 0) {
404 /*
405 * This slice had a vdev. We need a new dsk
406 * structure now since the vdev now owns this one.
407 */
408 dsk = copy_dsk(dsk);
409 }
410 }
411 }
412 slba++;
413 }
414 return;
415trymbr:
416#endif
417
418 if (drvread(dsk, sec, DOSBBSECTOR, 1))
419 return;
420 dp = (void *)(sec + DOSPARTOFF);
421
422 for (i = 0; i < NDOSPART; i++) {
423 if (!dp[i].dp_typ)
424 continue;
425 dsk->start = dp[i].dp_start;
426 if (vdev_probe(vdev_read, dsk, NULL) == 0) {
427 /*
428 * This slice had a vdev. We need a new dsk structure now
429 * since the vdev now owns this one.
430 */
431 dsk = copy_dsk(dsk);
432 }
433 }
434}
435
436int
437main(void)
438{
439 int autoboot, i;
440 dnode_phys_t dn;
441 off_t off;
442 struct dsk *dsk;
443
444 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
445
446 bios_getmem();
447
448 if (high_heap_size > 0) {
449 heap_end = PTOV(high_heap_base + high_heap_size);
450 heap_next = PTOV(high_heap_base);
451 } else {
452 heap_next = (char *) dmadat + sizeof(*dmadat);
453 heap_end = (char *) PTOV(bios_basemem);
454 }
455
456 dsk = malloc(sizeof(struct dsk));
457 dsk->drive = *(uint8_t *)PTOV(ARGS);
458 dsk->type = dsk->drive & DRV_HARD ? TYPE_AD : TYPE_FD;
459 dsk->unit = dsk->drive & DRV_MASK;
460 dsk->slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
461 dsk->part = 0;
462 dsk->start = 0;
463 dsk->init = 0;
464
465 bootinfo.bi_version = BOOTINFO_VERSION;
466 bootinfo.bi_size = sizeof(bootinfo);
467 bootinfo.bi_basemem = bios_basemem / 1024;
468 bootinfo.bi_extmem = bios_extmem / 1024;
469 bootinfo.bi_memsizes_valid++;
470 bootinfo.bi_bios_dev = dsk->drive;
471
472 bootdev = MAKEBOOTDEV(dev_maj[dsk->type],
473 dsk->slice, dsk->unit, dsk->part),
474
475 /* Process configuration file */
476
477 autoboot = 1;
478
479 zfs_init();
480
481 /*
482 * Probe the boot drive first - we will try to boot from whatever
483 * pool we find on that drive.
484 */
485 probe_drive(dsk);
486
487 /*
488 * Probe the rest of the drives that the bios knows about. This
489 * will find any other available pools and it may fill in missing
490 * vdevs for the boot pool.
491 */
492#ifndef VIRTUALBOX
493 for (i = 0; i < *(unsigned char *)PTOV(BIOS_NUMDRIVES); i++)
494#else
495 for (i = 0; i < MAXBDDEV; i++)
496#endif
497 {
498 if ((i | DRV_HARD) == *(uint8_t *)PTOV(ARGS))
499 continue;
500
501 if (!int13probe(i | DRV_HARD))
502 break;
503
504 dsk = malloc(sizeof(struct dsk));
505 dsk->drive = i | DRV_HARD;
506 dsk->type = dsk->drive & TYPE_AD;
507 dsk->unit = i;
508 dsk->slice = 0;
509 dsk->part = 0;
510 dsk->start = 0;
511 dsk->init = 0;
512 probe_drive(dsk);
513 }
514
515 /*
516 * The first discovered pool, if any, is the pool.
517 */
518 spa = spa_get_primary();
519 if (!spa) {
520 printf("%s: No ZFS pools located, can't boot\n", BOOTPROG);
521 for (;;)
522 ;
523 }
524
525 primary_spa = spa;
526 primary_vdev = spa_get_primary_vdev(spa);
527
528 if (zfs_spa_init(spa) != 0 || zfs_mount(spa, 0, &zfsmount) != 0) {
529 printf("%s: failed to mount default pool %s\n",
530 BOOTPROG, spa->spa_name);
531 autoboot = 0;
532 } else if (zfs_lookup(&zfsmount, PATH_CONFIG, &dn) == 0 ||
533 zfs_lookup(&zfsmount, PATH_DOTCONFIG, &dn) == 0) {
534 off = 0;
535 zfs_read(spa, &dn, &off, cmd, sizeof(cmd));
536 }
537
538 if (*cmd) {
539 /*
540 * Note that parse() is destructive to cmd[] and we also want
541 * to honor RBX_QUIET option that could be present in cmd[].
542 */
543 memcpy(cmddup, cmd, sizeof(cmd));
544 if (parse())
545 autoboot = 0;
546 if (!OPT_CHECK(RBX_QUIET))
547 printf("%s: %s\n", PATH_CONFIG, cmddup);
548 /* Do not process this command twice */
549 *cmd = 0;
550 }
551
552 /*
553 * Try to exec stage 3 boot loader. If interrupted by a keypress,
554 * or in case of failure, try to load a kernel directly instead.
555 */
556
557 if (autoboot && !*kname) {
558 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
559 if (!keyhit(3)) {
560 load();
561 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
562 }
563 }
564
565 /* Present the user with the boot2 prompt. */
566
567 for (;;) {
568 if (!autoboot || !OPT_CHECK(RBX_QUIET)) {
569 printf("\nFreeBSD/x86 boot\n");
570 if (zfs_rlookup(spa, zfsmount.rootobj, rootname) != 0)
571 printf("Default: %s/<0x%llx>:%s\n"
572 "boot: ",
573 spa->spa_name, zfsmount.rootobj, kname);
574 else if (rootname[0] != '\0')
575 printf("Default: %s/%s:%s\n"
576 "boot: ",
577 spa->spa_name, rootname, kname);
578 else
579 printf("Default: %s:%s\n"
580 "boot: ",
581 spa->spa_name, kname);
582 }
583 if (ioctrl & IO_SERIAL)
584 sio_flush();
585 if (!autoboot || keyhit(5))
586 getstr(cmd, sizeof(cmd));
587 else if (!autoboot || !OPT_CHECK(RBX_QUIET))
588 putchar('\n');
589 autoboot = 0;
590 if (parse())
591 putchar('\a');
592 else
593 load();
594 }
595}
596
597/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
598void
599exit(int x)
600{
601}
602
603static void
604load(void)
605{
606 union {
607 struct exec ex;
608 Elf32_Ehdr eh;
609 } hdr;
610 static Elf32_Phdr ep[2];
611 static Elf32_Shdr es[2];
612 caddr_t p;
613 dnode_phys_t dn;
614 off_t off;
615 uint32_t addr, x;
616 int fmt, i, j;
617
618 if (zfs_lookup(&zfsmount, kname, &dn)) {
619 printf("\nCan't find %s\n", kname);
620 return;
621 }
622 off = 0;
623 if (xfsread(&dn, &off, &hdr, sizeof(hdr)))
624 return;
625 if (N_GETMAGIC(hdr.ex) == ZMAGIC)
626 fmt = 0;
627 else if (IS_ELF(hdr.eh))
628 fmt = 1;
629 else {
630 printf("Invalid %s\n", "format");
631 return;
632 }
633 if (fmt == 0) {
634 addr = hdr.ex.a_entry & 0xffffff;
635 p = PTOV(addr);
636 off = PAGE_SIZE;
637 if (xfsread(&dn, &off, p, hdr.ex.a_text))
638 return;
639 p += roundup2(hdr.ex.a_text, PAGE_SIZE);
640 if (xfsread(&dn, &off, p, hdr.ex.a_data))
641 return;
642 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
643 bootinfo.bi_symtab = VTOP(p);
644 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
645 p += sizeof(hdr.ex.a_syms);
646 if (hdr.ex.a_syms) {
647 if (xfsread(&dn, &off, p, hdr.ex.a_syms))
648 return;
649 p += hdr.ex.a_syms;
650 if (xfsread(&dn, &off, p, sizeof(int)))
651 return;
652 x = *(uint32_t *)p;
653 p += sizeof(int);
654 x -= sizeof(int);
655 if (xfsread(&dn, &off, p, x))
656 return;
657 p += x;
658 }
659 } else {
660 off = hdr.eh.e_phoff;
661 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
662 if (xfsread(&dn, &off, ep + j, sizeof(ep[0])))
663 return;
664 if (ep[j].p_type == PT_LOAD)
665 j++;
666 }
667 for (i = 0; i < 2; i++) {
668 p = PTOV(ep[i].p_paddr & 0xffffff);
669 off = ep[i].p_offset;
670 if (xfsread(&dn, &off, p, ep[i].p_filesz))
671 return;
672 }
673 p += roundup2(ep[1].p_memsz, PAGE_SIZE);
674 bootinfo.bi_symtab = VTOP(p);
675 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
676 off = hdr.eh.e_shoff + sizeof(es[0]) *
677 (hdr.eh.e_shstrndx + 1);
678 if (xfsread(&dn, &off, &es, sizeof(es)))
679 return;
680 for (i = 0; i < 2; i++) {
681 memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
682 p += sizeof(es[i].sh_size);
683 off = es[i].sh_offset;
684 if (xfsread(&dn, &off, p, es[i].sh_size))
685 return;
686 p += es[i].sh_size;
687 }
688 }
689 addr = hdr.eh.e_entry & 0xffffff;
690 }
691 bootinfo.bi_esymtab = VTOP(p);
692 bootinfo.bi_kernelname = VTOP(kname);
693 zfsargs.size = sizeof(zfsargs);
694 zfsargs.pool = zfsmount.spa->spa_guid;
695 zfsargs.root = zfsmount.rootobj;
696 zfsargs.primary_pool = primary_spa->spa_guid;
697 if (primary_vdev != NULL)
698 zfsargs.primary_vdev = primary_vdev->v_guid;
699 else
700 printf("failed to detect primary vdev\n");
701 __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
702 bootdev,
703 KARGS_FLAGS_ZFS | KARGS_FLAGS_EXTARG,
704 (uint32_t) spa->spa_guid,
705 (uint32_t) (spa->spa_guid >> 32),
706 VTOP(&bootinfo),
707 zfsargs);
708}
709
710static int
711zfs_mount_ds(char *dsname)
712{
713 uint64_t newroot;
714 spa_t *newspa;
715 char *q;
716
717 q = strchr(dsname, '/');
718 if (q)
719 *q++ = '\0';
720 newspa = spa_find_by_name(dsname);
721 if (newspa == NULL) {
722 printf("\nCan't find ZFS pool %s\n", dsname);
723 return -1;
724 }
725
726 if (zfs_spa_init(newspa))
727 return -1;
728
729 newroot = 0;
730 if (q) {
731 if (zfs_lookup_dataset(newspa, q, &newroot)) {
732 printf("\nCan't find dataset %s in ZFS pool %s\n",
733 q, newspa->spa_name);
734 return -1;
735 }
736 }
737 if (zfs_mount(newspa, newroot, &zfsmount)) {
738 printf("\nCan't mount ZFS dataset\n");
739 return -1;
740 }
741 spa = newspa;
742 return (0);
743}
744
745static int
746parse(void)
747{
748 char *arg = cmd;
749 char *ep, *p, *q;
750 const char *cp;
751 int c, i, j;
752
753 while ((c = *arg++)) {
754 if (c == ' ' || c == '\t' || c == '\n')
755 continue;
756 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
757 ep = p;
758 if (*p)
759 *p++ = 0;
760 if (c == '-') {
761 while ((c = *arg++)) {
762 if (c == 'P') {
763 if (*(uint8_t *)PTOV(0x496) & 0x10) {
764 cp = "yes";
765 } else {
766 opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
767 cp = "no";
768 }
769 printf("Keyboard: %s\n", cp);
770 continue;
771 } else if (c == 'S') {
772 j = 0;
773 while ((unsigned int)(i = *arg++ - '0') <= 9)
774 j = j * 10 + i;
775 if (j > 0 && i == -'0') {
776 comspeed = j;
777 break;
778 }
779 /* Fall through to error below ('S' not in optstr[]). */
780 }
781 for (i = 0; c != optstr[i]; i++)
782 if (i == NOPT - 1)
783 return -1;
784 opts ^= OPT_SET(flags[i]);
785 }
786 ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
787 OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
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