gptboot.c revision 104679 
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/*
17 * $FreeBSD: head/sys/boot/i386/gptboot/gptboot.c 104679 2002-10-08 15:48:43Z phk $
18 */
19
20#include <sys/param.h>
21#include <sys/reboot.h>
22#include <sys/diskslice.h>
23#include <sys/disklabel.h>
24#include <sys/diskmbr.h>
25#include <sys/dirent.h>
26#include <machine/bootinfo.h>
27#include <machine/elf.h>
28
29#include <stdarg.h>
30
31#include <a.out.h>
32
33#include <btxv86.h>
34
35#include "boot2.h"
36#include "lib.h"
37
38#define IO_KEYBOARD	1
39#define IO_SERIAL	2
40
41#define SECOND		18	/* Circa that many ticks in a second. */
42
43#define RBX_ASKNAME	0x0	/* -a */
44#define RBX_SINGLE	0x1	/* -s */
45#define RBX_DFLTROOT	0x5	/* -r */
46#define RBX_KDB 	0x6	/* -d */
47#define RBX_CONFIG	0xa	/* -c */
48#define RBX_VERBOSE	0xb	/* -v */
49#define RBX_SERIAL	0xc	/* -h */
50#define RBX_CDROM	0xd	/* -C */
51#define RBX_GDB 	0xf	/* -g */
52#define RBX_MUTE	0x10	/* -m */
53#define RBX_PAUSE	0x12	/* -p */
54#define RBX_DUAL	0x1d	/* -D */
55#define RBX_PROBEKBD	0x1e	/* -P */
56#define RBX_NOINTR	0x1f	/* -n */
57
58#define RBX_MASK	0x2005ffff
59
60#define PATH_CONFIG	"/boot.config"
61#define PATH_BOOT3	"/boot/loader"
62#define PATH_KERNEL	"/kernel"
63
64#define ARGS		0x900
65#define NOPT		14
66#define NDEV		5
67#define MEM_BASE	0x12
68#define MEM_EXT 	0x15
69#define V86_CY(x)	((x) & 1)
70#define V86_ZR(x)	((x) & 0x40)
71
72#define DRV_HARD	0x80
73#define DRV_MASK	0x7f
74
75#define TYPE_AD		0
76#define TYPE_DA		2
77#define TYPE_MAXHARD	TYPE_DA
78#define TYPE_FD		4
79
80extern uint32_t _end;
81
82static const char optstr[NOPT] = "DhaCcdgmnPprsv";
83static const unsigned char flags[NOPT] = {
84    RBX_DUAL,
85    RBX_SERIAL,
86    RBX_ASKNAME,
87    RBX_CDROM,
88    RBX_CONFIG,
89    RBX_KDB,
90    RBX_GDB,
91    RBX_MUTE,
92    RBX_NOINTR,
93    RBX_PROBEKBD,
94    RBX_PAUSE,
95    RBX_DFLTROOT,
96    RBX_SINGLE,
97    RBX_VERBOSE
98};
99
100static const char *const dev_nm[NDEV] = {"ad", "wd", "da", "  ", "fd"};
101static const unsigned char dev_maj[NDEV] = {30, 0, 4, 1, 2};
102
103static struct dsk {
104    unsigned drive;
105    unsigned type;
106    unsigned unit;
107    unsigned slice;
108    unsigned part;
109    unsigned start;
110    int init;
111} dsk;
112static char cmd[512];
113static char kname[1024];
114static uint32_t opts = RB_BOOTINFO;
115static struct bootinfo bootinfo;
116static uint8_t ioctrl = IO_KEYBOARD;
117
118void exit(int);
119static void load(const char *);
120static int parse(char *);
121static int xfsread(ino_t, void *, size_t);
122static int dskread(void *, unsigned, unsigned);
123static void printf(const char *,...);
124static void putchar(int);
125static uint32_t memsize(int);
126static int drvread(void *, unsigned, unsigned);
127static int keyhit(unsigned);
128static int xputc(int);
129static int xgetc(int);
130static int getc(int);
131
132#if 1
133#define memcpy __builtin_memcpy
134#else
135static void memcpy(char *, const char *, int);
136static void
137memcpy(char *dst, const char *src, int len)
138{
139    while (len--)
140	*dst++ = *src++;
141}
142#endif
143
144static inline int
145strcmp(const char *s1, const char *s2)
146{
147    for (; *s1 == *s2 && *s1; s1++, s2++);
148    return (u_char)*s1 - (u_char)*s2;
149}
150
151#include "ufsread.c"
152
153static int
154xfsread(ino_t inode, void *buf, size_t nbyte)
155{
156    if (fsread(inode, buf, nbyte) != nbyte) {
157	printf("Invalid %s\n", "format");
158	return -1;
159    }
160    return 0;
161}
162
163static inline void
164getstr(char *str, int size)
165{
166    char *s;
167    int c;
168
169    s = str;
170    for (;;) {
171	switch (c = xgetc(0)) {
172	case 0:
173	    break;
174	case '\177':
175	    c = '\b';
176	case '\b':
177	    if (s > str) {
178		s--;
179		putchar('\b');
180		putchar(' ');
181	    } else
182		c = 0;
183	    break;
184	case '\n':
185	case '\r':
186	    *s = 0;
187	    return;
188	default:
189	    if (s - str < size - 1)
190		*s++ = c;
191	}
192	if (c)
193	    putchar(c);
194    }
195}
196
197static inline uint32_t
198drvinfo(int drive)
199{
200    v86.addr = 0x13;
201    v86.eax = 0x800;
202    v86.edx = DRV_HARD + drive;
203    v86int();
204    if (V86_CY(v86.efl))
205	return 0x4f010f;
206    return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) |
207	   (v86.edx & 0xff00) | (v86.ecx & 0x3f);
208}
209
210static inline void
211putc(int c)
212{
213    v86.addr = 0x10;
214    v86.eax = 0xe00 | (c & 0xff);
215    v86.ebx = 0x7;
216    v86int();
217}
218
219int
220main(void)
221{
222    int autoboot, i;
223    ino_t ino;
224
225    dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
226    v86.ctl = V86_FLAGS;
227    dsk.drive = *(uint8_t *)PTOV(ARGS);
228    dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
229    dsk.unit = dsk.drive & DRV_MASK;
230    dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
231    bootinfo.bi_version = BOOTINFO_VERSION;
232    bootinfo.bi_size = sizeof(bootinfo);
233    bootinfo.bi_basemem = 0;	/* XXX will be filled by loader or kernel */
234    bootinfo.bi_extmem = memsize(MEM_EXT);
235    bootinfo.bi_memsizes_valid++;
236    for (i = 0; i < N_BIOS_GEOM; i++)
237	bootinfo.bi_bios_geom[i] = drvinfo(i);
238
239    /* Process configuration file */
240
241    autoboot = 1;
242
243    if ((ino = lookup(PATH_CONFIG)))
244	fsread(ino, cmd, sizeof(cmd));
245
246    if (*cmd) {
247	printf("%s: %s", PATH_CONFIG, cmd);
248	if (parse(cmd))
249	    autoboot = 0;
250	/* Do not process this command twice */
251	*cmd = 0;
252    }
253
254    /*
255     * Try to exec stage 3 boot loader. If interrupted by a keypress,
256     * or in case of failure, try to load a kernel directly instead.
257     */
258
259    if (autoboot && !*kname) {
260	memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
261	if (!keyhit(3*SECOND)) {
262	    load(kname);
263	    memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
264	}
265    }
266
267    /* Present the user with the boot2 prompt. */
268
269    for (;;) {
270#ifdef UFS1_ONLY
271	printf(" \n>> FreeBSD/i386/UFS1 BOOT\n"
272#else
273	printf(" \n>> FreeBSD/i386/UFS[12] BOOT\n"
274#endif
275	       "Default: %u:%s(%u,%c)%s\n"
276	       "boot: ",
277	       dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
278	       'a' + dsk.part, kname);
279	if (ioctrl & IO_SERIAL)
280	    sio_flush();
281	if (!autoboot || keyhit(5*SECOND))
282	    getstr(cmd, sizeof(cmd));
283	else
284	    putchar('\n');
285	autoboot = 0;
286	if (parse(cmd))
287	    putchar('\a');
288	else
289	    load(kname);
290    }
291}
292
293/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
294void
295exit(int x)
296{
297}
298
299static void
300load(const char *fname)
301{
302    union {
303	struct exec ex;
304	Elf32_Ehdr eh;
305    } hdr;
306    Elf32_Phdr ep[2];
307    Elf32_Shdr es[2];
308    caddr_t p;
309    ino_t ino;
310    uint32_t addr, x;
311    int fmt, i, j;
312
313    if (!(ino = lookup(fname))) {
314	if (!ls)
315	    printf("No %s\n", fname);
316	return;
317    }
318    if (xfsread(ino, &hdr, sizeof(hdr)))
319	return;
320    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
321	fmt = 0;
322    else if (IS_ELF(hdr.eh))
323	fmt = 1;
324    else {
325	printf("Invalid %s\n", "format");
326	return;
327    }
328    if (fmt == 0) {
329	addr = hdr.ex.a_entry & 0xffffff;
330	p = PTOV(addr);
331	fs_off = PAGE_SIZE;
332	if (xfsread(ino, p, hdr.ex.a_text))
333	    return;
334	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
335	if (xfsread(ino, p, hdr.ex.a_data))
336	    return;
337	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
338	bootinfo.bi_symtab = VTOP(p);
339	memcpy(p, (char *)&hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
340	p += sizeof(hdr.ex.a_syms);
341	if (hdr.ex.a_syms) {
342	    if (xfsread(ino, p, hdr.ex.a_syms))
343		return;
344	    p += hdr.ex.a_syms;
345	    if (xfsread(ino, p, sizeof(int)))
346		return;
347	    x = *(uint32_t *)p;
348	    p += sizeof(int);
349	    x -= sizeof(int);
350	    if (xfsread(ino, p, x))
351		return;
352	    p += x;
353	}
354    } else {
355	fs_off = hdr.eh.e_phoff;
356	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
357	    if (xfsread(ino, ep + j, sizeof(ep[0])))
358		return;
359	    if (ep[j].p_type == PT_LOAD)
360		j++;
361	}
362	for (i = 0; i < 2; i++) {
363	    p = PTOV(ep[i].p_paddr & 0xffffff);
364	    fs_off = ep[i].p_offset;
365	    if (xfsread(ino, p, ep[i].p_filesz))
366		return;
367	}
368	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
369	bootinfo.bi_symtab = VTOP(p);
370	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
371	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
372		(hdr.eh.e_shstrndx + 1);
373	    if (xfsread(ino, &es, sizeof(es)))
374		return;
375	    for (i = 0; i < 2; i++) {
376		memcpy(p, (char *)&es[i].sh_size, sizeof(es[i].sh_size));
377		p += sizeof(es[i].sh_size);
378		fs_off = es[i].sh_offset;
379		if (xfsread(ino, p, es[i].sh_size))
380		    return;
381		p += es[i].sh_size;
382	    }
383	}
384	addr = hdr.eh.e_entry & 0xffffff;
385    }
386    bootinfo.bi_esymtab = VTOP(p);
387    bootinfo.bi_kernelname = VTOP(fname);
388    bootinfo.bi_bios_dev = dsk.drive;
389    __exec((caddr_t)addr, opts & RBX_MASK,
390	   MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
391	   0, 0, 0, VTOP(&bootinfo));
392}
393
394static int
395parse(char *arg)
396{
397    char *p, *q;
398    int drv, c, i;
399
400    while ((c = *arg++)) {
401	if (c == ' ' || c == '\t' || c == '\n')
402	    continue;
403	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
404	if (*p)
405	    *p++ = 0;
406	if (c == '-') {
407	    while ((c = *arg++)) {
408		for (i = 0; c != optstr[i]; i++)
409		    if (i == NOPT - 1)
410			return -1;
411		opts ^= 1 << flags[i];
412	    }
413	    if (opts & 1 << RBX_PROBEKBD) {
414		i = *(uint8_t *)PTOV(0x496) & 0x10;
415		/* printf("Keyboard: %s\n", i ? "yes" : "no"); */
416		if (!i)
417		    opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
418		opts &= ~(1 << RBX_PROBEKBD);
419	    }
420	    ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
421		     opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
422	    if (ioctrl & IO_SERIAL)
423	        sio_init();
424	} else {
425	    for (q = arg--; *q && *q != '('; q++);
426	    if (*q) {
427		drv = -1;
428		if (arg[1] == ':') {
429		    if (*arg < '0' || *arg > '9')
430			return -1;
431		    drv = *arg - '0';
432		    arg += 2;
433		}
434		if (q - arg != 2)
435		    return -1;
436		for (i = 0; arg[0] != dev_nm[i][0] ||
437			    arg[1] != dev_nm[i][1]; i++)
438		    if (i == NDEV - 1)
439			return -1;
440		dsk.type = i;
441		arg += 3;
442		if (arg[1] != ',' || *arg < '0' || *arg > '9')
443		    return -1;
444		dsk.unit = *arg - '0';
445		arg += 2;
446		dsk.slice = WHOLE_DISK_SLICE;
447		if (arg[1] == ',') {
448		    if (*arg < '0' || *arg > '0' + NDOSPART)
449			return -1;
450		    if ((dsk.slice = *arg - '0'))
451			dsk.slice++;
452		    arg += 2;
453		}
454		if (arg[1] != ')' || *arg < 'a' || *arg > 'p')
455		    return -1;
456		dsk.part = *arg - 'a';
457		arg += 2;
458		if (drv == -1)
459		    drv = dsk.unit;
460		dsk.drive = (dsk.type <= TYPE_MAXHARD
461			     ? DRV_HARD : 0) + drv;
462		dsk_meta = 0;
463		fsread(0, NULL, 0);
464	    }
465	    if ((i = p - arg - !*(p - 1))) {
466		if (i >= sizeof(kname))
467		    return -1;
468		memcpy(kname, arg, i + 1);
469	    }
470	}
471	arg = p;
472    }
473    return 0;
474}
475
476static int
477dskread(void *buf, unsigned lba, unsigned nblk)
478{
479    struct dos_partition *dp;
480    struct disklabel *d;
481    char *sec;
482    unsigned sl, i;
483
484    if (!dsk_meta) {
485	sec = dmadat->secbuf;
486	dsk.start = 0;
487	if (drvread(sec, DOSBBSECTOR, 1))
488	    return -1;
489	dp = (void *)(sec + DOSPARTOFF);
490	sl = dsk.slice;
491	if (sl < BASE_SLICE) {
492	    for (i = 0; i < NDOSPART; i++)
493		if (dp[i].dp_typ == DOSPTYP_386BSD &&
494		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
495		    sl = BASE_SLICE + i;
496		    if (dp[i].dp_flag & 0x80 ||
497			dsk.slice == COMPATIBILITY_SLICE)
498			break;
499		}
500	    if (dsk.slice == WHOLE_DISK_SLICE)
501		dsk.slice = sl;
502	}
503	if (sl != WHOLE_DISK_SLICE) {
504	    if (sl != COMPATIBILITY_SLICE)
505		dp += sl - BASE_SLICE;
506	    if (dp->dp_typ != DOSPTYP_386BSD) {
507		printf("Invalid %s\n", "slice");
508		return -1;
509	    }
510	    dsk.start = dp->dp_start;
511	}
512	if (drvread(sec, dsk.start + LABELSECTOR, 1))
513		return -1;
514	d = (void *)(sec + LABELOFFSET);
515	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
516	    if (dsk.part != RAW_PART) {
517		printf("Invalid %s\n", "label");
518		return -1;
519	    }
520	} else {
521	    if (!dsk.init) {
522		if (d->d_type == DTYPE_SCSI)
523		    dsk.type = TYPE_DA;
524		dsk.init++;
525	    }
526	    if (dsk.part >= d->d_npartitions ||
527		!d->d_partitions[dsk.part].p_size) {
528		printf("Invalid %s\n", "partition");
529		return -1;
530	    }
531	    dsk.start += d->d_partitions[dsk.part].p_offset;
532	    dsk.start -= d->d_partitions[RAW_PART].p_offset;
533	}
534    }
535    return drvread(buf, dsk.start + lba, nblk);
536}
537
538static void
539printf(const char *fmt,...)
540{
541    static const char digits[16] = "0123456789abcdef";
542    va_list ap;
543    char buf[10];
544    char *s;
545    unsigned r, u;
546    int c;
547
548    va_start(ap, fmt);
549    while ((c = *fmt++)) {
550	if (c == '%') {
551	    c = *fmt++;
552	    switch (c) {
553	    case 'c':
554		putchar(va_arg(ap, int));
555		continue;
556	    case 's':
557		for (s = va_arg(ap, char *); *s; s++)
558		    putchar(*s);
559		continue;
560	    case 'u':
561	    case 'x':
562		r = c == 'u' ? 10U : 16U;
563		u = va_arg(ap, unsigned);
564		s = buf;
565		do
566		    *s++ = digits[u % r];
567		while (u /= r);
568		while (--s >= buf)
569		    putchar(*s);
570		continue;
571	    }
572	}
573	putchar(c);
574    }
575    va_end(ap);
576    return;
577}
578
579static void
580putchar(int c)
581{
582    if (c == '\n')
583	xputc('\r');
584    xputc(c);
585}
586
587static uint32_t
588memsize(int type)
589{
590    v86.addr = type;
591    v86.eax = 0x8800;
592    v86int();
593    return v86.eax;
594}
595
596static int
597drvread(void *buf, unsigned lba, unsigned nblk)
598{
599    static unsigned c = 0x2d5c7c2f;
600
601    printf("%c\b", c = c << 8 | c >> 24);
602    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
603    v86.addr = XREADORG;		/* call to xread in boot1 */
604    v86.es = VTOPSEG(buf);
605    v86.eax = lba;
606    v86.ebx = VTOPOFF(buf);
607    v86.ecx = lba >> 16;
608    v86.edx = nblk << 8 | dsk.drive;
609    v86int();
610    v86.ctl = V86_FLAGS;
611    if (V86_CY(v86.efl)) {
612	printf("Disk error 0x%x lba 0x%x\n", v86.eax >> 8 & 0xff, lba);
613	return -1;
614    }
615    return 0;
616}
617
618static int
619keyhit(unsigned ticks)
620{
621    uint32_t t0, t1;
622
623    if (opts & 1 << RBX_NOINTR)
624	return 0;
625    t0 = 0;
626    for (;;) {
627	if (xgetc(1))
628	    return 1;
629	t1 = *(uint32_t *)PTOV(0x46c);
630	if (!t0)
631	    t0 = t1;
632	if (t1 < t0 || t1 >= t0 + ticks)
633	    return 0;
634    }
635}
636
637static int
638xputc(int c)
639{
640    if (ioctrl & IO_KEYBOARD)
641	putc(c);
642    if (ioctrl & IO_SERIAL)
643	sio_putc(c);
644    return c;
645}
646
647static int
648xgetc(int fn)
649{
650    if (opts & 1 << RBX_NOINTR)
651	return 0;
652    for (;;) {
653	if (ioctrl & IO_KEYBOARD && getc(1))
654	    return fn ? 1 : getc(0);
655	if (ioctrl & IO_SERIAL && sio_ischar())
656	    return fn ? 1 : sio_getc();
657	if (fn)
658	    return 0;
659    }
660}
661
662static int
663getc(int fn)
664{
665    v86.addr = 0x16;
666    v86.eax = fn << 8;
667    v86int();
668    return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
669}
670