zfsboot.c revision 295453 
1/*-
2 * Copyright (c) 1998 Robert Nordier
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are freely
6 * permitted provided that the above copyright notice and this
7 * paragraph and the following disclaimer are duplicated in all
8 * such forms.
9 *
10 * This software is provided "AS IS" and without any express or
11 * implied warranties, including, without limitation, the implied
12 * warranties of merchantability and fitness for a particular
13 * purpose.
14 */
15
16#include <sys/cdefs.h>
17__FBSDID("$FreeBSD: stable/10/sys/boot/i386/zfsboot/zfsboot.c 295453 2016-02-09 22:32:24Z emaste $");
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#include "paths.h"
46
47#include "libzfs.h"
48
49#define ARGS		0x900
50#define NOPT		14
51#define NDEV		3
52
53#define BIOS_NUMDRIVES	0x475
54#define DRV_HARD	0x80
55#define DRV_MASK	0x7f
56
57#define TYPE_AD		0
58#define TYPE_DA		1
59#define TYPE_MAXHARD	TYPE_DA
60#define TYPE_FD		2
61
62extern uint32_t _end;
63
64#ifdef GPT
65static const uuid_t freebsd_zfs_uuid = GPT_ENT_TYPE_FREEBSD_ZFS;
66#endif
67static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
68static const unsigned char flags[NOPT] = {
69    RBX_DUAL,
70    RBX_SERIAL,
71    RBX_ASKNAME,
72    RBX_CDROM,
73    RBX_CONFIG,
74    RBX_KDB,
75    RBX_GDB,
76    RBX_MUTE,
77    RBX_NOINTR,
78    RBX_PAUSE,
79    RBX_QUIET,
80    RBX_DFLTROOT,
81    RBX_SINGLE,
82    RBX_VERBOSE
83};
84uint32_t opts;
85
86static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
87static const unsigned char dev_maj[NDEV] = {30, 4, 2};
88
89static char cmd[512];
90static char cmddup[512];
91static char kname[1024];
92static char rootname[256];
93static int comspeed = SIOSPD;
94static struct bootinfo bootinfo;
95static uint32_t bootdev;
96static struct zfs_boot_args zfsargs;
97static struct zfsmount zfsmount;
98
99vm_offset_t	high_heap_base;
100uint32_t	bios_basemem, bios_extmem, high_heap_size;
101
102static struct bios_smap smap;
103
104/*
105 * The minimum amount of memory to reserve in bios_extmem for the heap.
106 */
107#define	HEAP_MIN	(3 * 1024 * 1024)
108
109static char *heap_next;
110static char *heap_end;
111
112/* Buffers that must not span a 64k boundary. */
113#define READ_BUF_SIZE	8192
114struct dmadat {
115	char rdbuf[READ_BUF_SIZE];	/* for reading large things */
116	char secbuf[READ_BUF_SIZE];	/* for MBR/disklabel */
117};
118static struct dmadat *dmadat;
119
120void exit(int);
121static void load(void);
122static int parse(void);
123static void bios_getmem(void);
124
125static void *
126malloc(size_t n)
127{
128	char *p = heap_next;
129	if (p + n > heap_end) {
130		printf("malloc failure\n");
131		for (;;)
132		    ;
133		return 0;
134	}
135	heap_next += n;
136	return p;
137}
138
139static char *
140strdup(const char *s)
141{
142	char *p = malloc(strlen(s) + 1);
143	strcpy(p, s);
144	return p;
145}
146
147#include "zfsimpl.c"
148
149/*
150 * Read from a dnode (which must be from a ZPL filesystem).
151 */
152static int
153zfs_read(spa_t *spa, const dnode_phys_t *dnode, off_t *offp, void *start, size_t size)
154{
155	const znode_phys_t *zp = (const znode_phys_t *) dnode->dn_bonus;
156	size_t n;
157	int rc;
158
159	n = size;
160	if (*offp + n > zp->zp_size)
161		n = zp->zp_size - *offp;
162
163	rc = dnode_read(spa, dnode, *offp, start, n);
164	if (rc)
165		return (-1);
166	*offp += n;
167
168	return (n);
169}
170
171/*
172 * Current ZFS pool
173 */
174static spa_t *spa;
175static spa_t *primary_spa;
176static vdev_t *primary_vdev;
177
178/*
179 * A wrapper for dskread that doesn't have to worry about whether the
180 * buffer pointer crosses a 64k boundary.
181 */
182static int
183vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes)
184{
185	char *p;
186	daddr_t lba;
187	unsigned int nb;
188	struct dsk *dsk = (struct dsk *) priv;
189
190	if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1)))
191		return -1;
192
193	p = buf;
194	lba = off / DEV_BSIZE;
195	lba += dsk->start;
196	while (bytes > 0) {
197		nb = bytes / DEV_BSIZE;
198		if (nb > READ_BUF_SIZE / DEV_BSIZE)
199			nb = READ_BUF_SIZE / DEV_BSIZE;
200		if (drvread(dsk, dmadat->rdbuf, lba, nb))
201			return -1;
202		memcpy(p, dmadat->rdbuf, nb * DEV_BSIZE);
203		p += nb * DEV_BSIZE;
204		lba += nb;
205		bytes -= nb * DEV_BSIZE;
206	}
207
208	return 0;
209}
210
211static int
212xfsread(const dnode_phys_t *dnode, off_t *offp, void *buf, size_t nbyte)
213{
214    if ((size_t)zfs_read(spa, dnode, offp, buf, nbyte) != nbyte) {
215	printf("Invalid format\n");
216	return -1;
217    }
218    return 0;
219}
220
221static void
222bios_getmem(void)
223{
224    uint64_t size;
225
226    /* Parse system memory map */
227    v86.ebx = 0;
228    do {
229	v86.ctl = V86_FLAGS;
230	v86.addr = 0x15;		/* int 0x15 function 0xe820*/
231	v86.eax = 0xe820;
232	v86.ecx = sizeof(struct bios_smap);
233	v86.edx = SMAP_SIG;
234	v86.es = VTOPSEG(&smap);
235	v86.edi = VTOPOFF(&smap);
236	v86int();
237	if (V86_CY(v86.efl) || (v86.eax != SMAP_SIG))
238	    break;
239	/* look for a low-memory segment that's large enough */
240	if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) &&
241	    (smap.length >= (512 * 1024)))
242	    bios_basemem = smap.length;
243	/* look for the first segment in 'extended' memory */
244	if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) {
245	    bios_extmem = smap.length;
246	}
247
248	/*
249	 * Look for the largest segment in 'extended' memory beyond
250	 * 1MB but below 4GB.
251	 */
252	if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) &&
253	    (smap.base < 0x100000000ull)) {
254	    size = smap.length;
255
256	    /*
257	     * If this segment crosses the 4GB boundary, truncate it.
258	     */
259	    if (smap.base + size > 0x100000000ull)
260		size = 0x100000000ull - smap.base;
261
262	    if (size > high_heap_size) {
263		high_heap_size = size;
264		high_heap_base = smap.base;
265	    }
266	}
267    } while (v86.ebx != 0);
268
269    /* Fall back to the old compatibility function for base memory */
270    if (bios_basemem == 0) {
271	v86.ctl = 0;
272	v86.addr = 0x12;		/* int 0x12 */
273	v86int();
274
275	bios_basemem = (v86.eax & 0xffff) * 1024;
276    }
277
278    /* Fall back through several compatibility functions for extended memory */
279    if (bios_extmem == 0) {
280	v86.ctl = V86_FLAGS;
281	v86.addr = 0x15;		/* int 0x15 function 0xe801*/
282	v86.eax = 0xe801;
283	v86int();
284	if (!V86_CY(v86.efl)) {
285	    bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024;
286	}
287    }
288    if (bios_extmem == 0) {
289	v86.ctl = 0;
290	v86.addr = 0x15;		/* int 0x15 function 0x88*/
291	v86.eax = 0x8800;
292	v86int();
293	bios_extmem = (v86.eax & 0xffff) * 1024;
294    }
295
296    /*
297     * If we have extended memory and did not find a suitable heap
298     * region in the SMAP, use the last 3MB of 'extended' memory as a
299     * high heap candidate.
300     */
301    if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
302	high_heap_size = HEAP_MIN;
303	high_heap_base = bios_extmem + 0x100000 - HEAP_MIN;
304    }
305}
306
307/*
308 * Try to detect a device supported by the legacy int13 BIOS
309 */
310static int
311int13probe(int drive)
312{
313    v86.ctl = V86_FLAGS;
314    v86.addr = 0x13;
315    v86.eax = 0x800;
316    v86.edx = drive;
317    v86int();
318
319    if (!V86_CY(v86.efl) &&				/* carry clear */
320	((v86.edx & 0xff) != (drive & DRV_MASK))) {	/* unit # OK */
321	if ((v86.ecx & 0x3f) == 0) {			/* absurd sector size */
322		return(0);				/* skip device */
323	}
324	return (1);
325    }
326    return(0);
327}
328
329/*
330 * We call this when we find a ZFS vdev - ZFS consumes the dsk
331 * structure so we must make a new one.
332 */
333static struct dsk *
334copy_dsk(struct dsk *dsk)
335{
336    struct dsk *newdsk;
337
338    newdsk = malloc(sizeof(struct dsk));
339    *newdsk = *dsk;
340    return (newdsk);
341}
342
343static void
344probe_drive(struct dsk *dsk)
345{
346#ifdef GPT
347    struct gpt_hdr hdr;
348    struct gpt_ent *ent;
349    daddr_t slba, elba;
350    unsigned part, entries_per_sec;
351#endif
352    struct dos_partition *dp;
353    char *sec;
354    unsigned i;
355
356    /*
357     * If we find a vdev on the whole disk, stop here. Otherwise dig
358     * out the partition table and probe each slice/partition
359     * in turn for a vdev.
360     */
361    if (vdev_probe(vdev_read, dsk, NULL) == 0)
362	return;
363
364    sec = dmadat->secbuf;
365    dsk->start = 0;
366
367#ifdef GPT
368    /*
369     * First check for GPT.
370     */
371    if (drvread(dsk, sec, 1, 1)) {
372	return;
373    }
374    memcpy(&hdr, sec, sizeof(hdr));
375    if (memcmp(hdr.hdr_sig, GPT_HDR_SIG, sizeof(hdr.hdr_sig)) != 0 ||
376	hdr.hdr_lba_self != 1 || hdr.hdr_revision < 0x00010000 ||
377	hdr.hdr_entsz < sizeof(*ent) || DEV_BSIZE % hdr.hdr_entsz != 0) {
378	goto trymbr;
379    }
380
381    /*
382     * Probe all GPT partitions for the presense of ZFS pools. We
383     * return the spa_t for the first we find (if requested). This
384     * will have the effect of booting from the first pool on the
385     * disk.
386     */
387    entries_per_sec = DEV_BSIZE / hdr.hdr_entsz;
388    slba = hdr.hdr_lba_table;
389    elba = slba + hdr.hdr_entries / entries_per_sec;
390    while (slba < elba) {
391	dsk->start = 0;
392	if (drvread(dsk, sec, slba, 1))
393	    return;
394	for (part = 0; part < entries_per_sec; part++) {
395	    ent = (struct gpt_ent *)(sec + part * hdr.hdr_entsz);
396	    if (memcmp(&ent->ent_type, &freebsd_zfs_uuid,
397		     sizeof(uuid_t)) == 0) {
398		dsk->start = ent->ent_lba_start;
399		if (vdev_probe(vdev_read, dsk, NULL) == 0) {
400		    /*
401		     * This slice had a vdev. We need a new dsk
402		     * structure now since the vdev now owns this one.
403		     */
404		    dsk = copy_dsk(dsk);
405		}
406	    }
407	}
408	slba++;
409    }
410    return;
411trymbr:
412#endif
413
414    if (drvread(dsk, sec, DOSBBSECTOR, 1))
415	return;
416    dp = (void *)(sec + DOSPARTOFF);
417
418    for (i = 0; i < NDOSPART; i++) {
419	if (!dp[i].dp_typ)
420	    continue;
421	dsk->start = dp[i].dp_start;
422	if (vdev_probe(vdev_read, dsk, NULL) == 0) {
423	    /*
424	     * This slice had a vdev. We need a new dsk structure now
425	     * since the vdev now owns this one.
426	     */
427	    dsk = copy_dsk(dsk);
428	}
429    }
430}
431
432int
433main(void)
434{
435    int autoboot, i;
436    dnode_phys_t dn;
437    off_t off;
438    struct dsk *dsk;
439
440    dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
441
442    bios_getmem();
443
444    if (high_heap_size > 0) {
445	heap_end = PTOV(high_heap_base + high_heap_size);
446	heap_next = PTOV(high_heap_base);
447    } else {
448	heap_next = (char *) dmadat + sizeof(*dmadat);
449	heap_end = (char *) PTOV(bios_basemem);
450    }
451
452    dsk = malloc(sizeof(struct dsk));
453    dsk->drive = *(uint8_t *)PTOV(ARGS);
454    dsk->type = dsk->drive & DRV_HARD ? TYPE_AD : TYPE_FD;
455    dsk->unit = dsk->drive & DRV_MASK;
456    dsk->slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
457    dsk->part = 0;
458    dsk->start = 0;
459    dsk->init = 0;
460
461    bootinfo.bi_version = BOOTINFO_VERSION;
462    bootinfo.bi_size = sizeof(bootinfo);
463    bootinfo.bi_basemem = bios_basemem / 1024;
464    bootinfo.bi_extmem = bios_extmem / 1024;
465    bootinfo.bi_memsizes_valid++;
466    bootinfo.bi_bios_dev = dsk->drive;
467
468    bootdev = MAKEBOOTDEV(dev_maj[dsk->type],
469			  dsk->slice, dsk->unit, dsk->part),
470
471    /* Process configuration file */
472
473    autoboot = 1;
474
475    zfs_init();
476
477    /*
478     * Probe the boot drive first - we will try to boot from whatever
479     * pool we find on that drive.
480     */
481    probe_drive(dsk);
482
483    /*
484     * Probe the rest of the drives that the bios knows about. This
485     * will find any other available pools and it may fill in missing
486     * vdevs for the boot pool.
487     */
488#ifndef VIRTUALBOX
489    for (i = 0; i < *(unsigned char *)PTOV(BIOS_NUMDRIVES); i++)
490#else
491    for (i = 0; i < MAXBDDEV; i++)
492#endif
493    {
494	if ((i | DRV_HARD) == *(uint8_t *)PTOV(ARGS))
495	    continue;
496
497	if (!int13probe(i | DRV_HARD))
498	    break;
499
500	dsk = malloc(sizeof(struct dsk));
501	dsk->drive = i | DRV_HARD;
502	dsk->type = dsk->drive & TYPE_AD;
503	dsk->unit = i;
504	dsk->slice = 0;
505	dsk->part = 0;
506	dsk->start = 0;
507	dsk->init = 0;
508	probe_drive(dsk);
509    }
510
511    /*
512     * The first discovered pool, if any, is the pool.
513     */
514    spa = spa_get_primary();
515    if (!spa) {
516	printf("%s: No ZFS pools located, can't boot\n", BOOTPROG);
517	for (;;)
518	    ;
519    }
520
521    primary_spa = spa;
522    primary_vdev = spa_get_primary_vdev(spa);
523
524    if (zfs_spa_init(spa) != 0 || zfs_mount(spa, 0, &zfsmount) != 0) {
525	printf("%s: failed to mount default pool %s\n",
526	    BOOTPROG, spa->spa_name);
527	autoboot = 0;
528    } else if (zfs_lookup(&zfsmount, PATH_CONFIG, &dn) == 0 ||
529        zfs_lookup(&zfsmount, PATH_DOTCONFIG, &dn) == 0) {
530	off = 0;
531	zfs_read(spa, &dn, &off, cmd, sizeof(cmd));
532    }
533
534    if (*cmd) {
535	/*
536	 * Note that parse() is destructive to cmd[] and we also want
537	 * to honor RBX_QUIET option that could be present in cmd[].
538	 */
539	memcpy(cmddup, cmd, sizeof(cmd));
540	if (parse())
541	    autoboot = 0;
542	if (!OPT_CHECK(RBX_QUIET))
543	    printf("%s: %s\n", PATH_CONFIG, cmddup);
544	/* Do not process this command twice */
545	*cmd = 0;
546    }
547
548    /*
549     * Try to exec /boot/loader. If interrupted by a keypress,
550     * or in case of failure, try to load a kernel directly instead.
551     */
552
553    if (autoboot && !*kname) {
554	memcpy(kname, PATH_LOADER_ZFS, sizeof(PATH_LOADER_ZFS));
555	if (!keyhit(3)) {
556	    load();
557	    memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
558	}
559    }
560
561    /* Present the user with the boot2 prompt. */
562
563    for (;;) {
564	if (!autoboot || !OPT_CHECK(RBX_QUIET)) {
565	    printf("\nFreeBSD/x86 boot\n");
566	    if (zfs_rlookup(spa, zfsmount.rootobj, rootname) != 0)
567		printf("Default: %s/<0x%llx>:%s\n"
568		       "boot: ",
569		       spa->spa_name, zfsmount.rootobj, kname);
570	    else if (rootname[0] != '\0')
571		printf("Default: %s/%s:%s\n"
572		       "boot: ",
573		       spa->spa_name, rootname, kname);
574	    else
575		printf("Default: %s:%s\n"
576		       "boot: ",
577		       spa->spa_name, kname);
578	}
579	if (ioctrl & IO_SERIAL)
580	    sio_flush();
581	if (!autoboot || keyhit(5))
582	    getstr(cmd, sizeof(cmd));
583	else if (!autoboot || !OPT_CHECK(RBX_QUIET))
584	    putchar('\n');
585	autoboot = 0;
586	if (parse())
587	    putchar('\a');
588	else
589	    load();
590    }
591}
592
593/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
594void
595exit(int x)
596{
597}
598
599static void
600load(void)
601{
602    union {
603	struct exec ex;
604	Elf32_Ehdr eh;
605    } hdr;
606    static Elf32_Phdr ep[2];
607    static Elf32_Shdr es[2];
608    caddr_t p;
609    dnode_phys_t dn;
610    off_t off;
611    uint32_t addr, x;
612    int fmt, i, j;
613
614    if (zfs_lookup(&zfsmount, kname, &dn)) {
615	printf("\nCan't find %s\n", kname);
616	return;
617    }
618    off = 0;
619    if (xfsread(&dn, &off, &hdr, sizeof(hdr)))
620	return;
621    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
622	fmt = 0;
623    else if (IS_ELF(hdr.eh))
624	fmt = 1;
625    else {
626	printf("Invalid %s\n", "format");
627	return;
628    }
629    if (fmt == 0) {
630	addr = hdr.ex.a_entry & 0xffffff;
631	p = PTOV(addr);
632	off = PAGE_SIZE;
633	if (xfsread(&dn, &off, p, hdr.ex.a_text))
634	    return;
635	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
636	if (xfsread(&dn, &off, p, hdr.ex.a_data))
637	    return;
638	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
639	bootinfo.bi_symtab = VTOP(p);
640	memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
641	p += sizeof(hdr.ex.a_syms);
642	if (hdr.ex.a_syms) {
643	    if (xfsread(&dn, &off, p, hdr.ex.a_syms))
644		return;
645	    p += hdr.ex.a_syms;
646	    if (xfsread(&dn, &off, p, sizeof(int)))
647		return;
648	    x = *(uint32_t *)p;
649	    p += sizeof(int);
650	    x -= sizeof(int);
651	    if (xfsread(&dn, &off, p, x))
652		return;
653	    p += x;
654	}
655    } else {
656	off = hdr.eh.e_phoff;
657	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
658	    if (xfsread(&dn, &off, ep + j, sizeof(ep[0])))
659		return;
660	    if (ep[j].p_type == PT_LOAD)
661		j++;
662	}
663	for (i = 0; i < 2; i++) {
664	    p = PTOV(ep[i].p_paddr & 0xffffff);
665	    off = ep[i].p_offset;
666	    if (xfsread(&dn, &off, p, ep[i].p_filesz))
667		return;
668	}
669	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
670	bootinfo.bi_symtab = VTOP(p);
671	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
672	    off = hdr.eh.e_shoff + sizeof(es[0]) *
673		(hdr.eh.e_shstrndx + 1);
674	    if (xfsread(&dn, &off, &es, sizeof(es)))
675		return;
676	    for (i = 0; i < 2; i++) {
677		memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
678		p += sizeof(es[i].sh_size);
679		off = es[i].sh_offset;
680		if (xfsread(&dn, &off, p, es[i].sh_size))
681		    return;
682		p += es[i].sh_size;
683	    }
684	}
685	addr = hdr.eh.e_entry & 0xffffff;
686    }
687    bootinfo.bi_esymtab = VTOP(p);
688    bootinfo.bi_kernelname = VTOP(kname);
689    zfsargs.size = sizeof(zfsargs);
690    zfsargs.pool = zfsmount.spa->spa_guid;
691    zfsargs.root = zfsmount.rootobj;
692    zfsargs.primary_pool = primary_spa->spa_guid;
693    if (primary_vdev != NULL)
694	zfsargs.primary_vdev = primary_vdev->v_guid;
695    else
696	printf("failed to detect primary vdev\n");
697    __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
698	   bootdev,
699	   KARGS_FLAGS_ZFS | KARGS_FLAGS_EXTARG,
700	   (uint32_t) spa->spa_guid,
701	   (uint32_t) (spa->spa_guid >> 32),
702	   VTOP(&bootinfo),
703	   zfsargs);
704}
705
706static int
707zfs_mount_ds(char *dsname)
708{
709    uint64_t newroot;
710    spa_t *newspa;
711    char *q;
712
713    q = strchr(dsname, '/');
714    if (q)
715	*q++ = '\0';
716    newspa = spa_find_by_name(dsname);
717    if (newspa == NULL) {
718	printf("\nCan't find ZFS pool %s\n", dsname);
719	return -1;
720    }
721
722    if (zfs_spa_init(newspa))
723	return -1;
724
725    newroot = 0;
726    if (q) {
727	if (zfs_lookup_dataset(newspa, q, &newroot)) {
728	    printf("\nCan't find dataset %s in ZFS pool %s\n",
729		    q, newspa->spa_name);
730	    return -1;
731	}
732    }
733    if (zfs_mount(newspa, newroot, &zfsmount)) {
734	printf("\nCan't mount ZFS dataset\n");
735	return -1;
736    }
737    spa = newspa;
738    return (0);
739}
740
741static int
742parse(void)
743{
744    char *arg = cmd;
745    char *ep, *p, *q;
746    const char *cp;
747    int c, i, j;
748
749    while ((c = *arg++)) {
750	if (c == ' ' || c == '\t' || c == '\n')
751	    continue;
752	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
753	ep = p;
754	if (*p)
755	    *p++ = 0;
756	if (c == '-') {
757	    while ((c = *arg++)) {
758		if (c == 'P') {
759		    if (*(uint8_t *)PTOV(0x496) & 0x10) {
760			cp = "yes";
761		    } else {
762			opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
763			cp = "no";
764		    }
765		    printf("Keyboard: %s\n", cp);
766		    continue;
767		} else if (c == 'S') {
768		    j = 0;
769		    while ((unsigned int)(i = *arg++ - '0') <= 9)
770			j = j * 10 + i;
771		    if (j > 0 && i == -'0') {
772			comspeed = j;
773			break;
774		    }
775		    /* Fall through to error below ('S' not in optstr[]). */
776		}
777		for (i = 0; c != optstr[i]; i++)
778		    if (i == NOPT - 1)
779			return -1;
780		opts ^= OPT_SET(flags[i]);
781	    }
782	    ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
783		     OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
784	    if (ioctrl & IO_SERIAL) {
785	        if (sio_init(115200 / comspeed) != 0)
786		    ioctrl &= ~IO_SERIAL;
787	    }
788	} if (c == '?') {
789	    dnode_phys_t dn;
790
791	    if (zfs_lookup(&zfsmount, arg, &dn) == 0) {
792		zap_list(spa, &dn);
793	    }
794	    return -1;
795	} else {
796	    arg--;
797
798	    /*
799	     * Report pool status if the comment is 'status'. Lets
800	     * hope no-one wants to load /status as a kernel.
801	     */
802	    if (!strcmp(arg, "status")) {
803		spa_all_status();
804		return -1;
805	    }
806
807	    /*
808	     * If there is "zfs:" prefix simply ignore it.
809	     */
810	    if (strncmp(arg, "zfs:", 4) == 0)
811		arg += 4;
812
813	    /*
814	     * If there is a colon, switch pools.
815	     */
816	    q = strchr(arg, ':');
817	    if (q) {
818		*q++ = '\0';
819		if (zfs_mount_ds(arg) != 0)
820		    return -1;
821		arg = q;
822	    }
823	    if ((i = ep - arg)) {
824		if ((size_t)i >= sizeof(kname))
825		    return -1;
826		memcpy(kname, arg, i + 1);
827	    }
828	}
829	arg = p;
830    }
831    return 0;
832}
833