gptboot.c revision 104315 
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 104315 2002-10-01 19:31:09Z iwasaki $
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_WD		1
77#define TYPE_DA		2
78#define TYPE_MAXHARD	TYPE_DA
79#define TYPE_WFD 	3
80#define TYPE_FD		4
81
82extern uint32_t _end;
83
84static const char optstr[NOPT] = "DhaCcdgmnPprsv";
85static const unsigned char flags[NOPT] = {
86    RBX_DUAL,
87    RBX_SERIAL,
88    RBX_ASKNAME,
89    RBX_CDROM,
90    RBX_CONFIG,
91    RBX_KDB,
92    RBX_GDB,
93    RBX_MUTE,
94    RBX_NOINTR,
95    RBX_PROBEKBD,
96    RBX_PAUSE,
97    RBX_DFLTROOT,
98    RBX_SINGLE,
99    RBX_VERBOSE
100};
101
102static const char *const dev_nm[NDEV] = {"ad", "wd", "da", "  ", "fd"};
103static const unsigned char dev_maj[NDEV] = {30, 0, 4, 1, 2};
104
105static struct dsk {
106    unsigned drive;
107    unsigned type;
108    unsigned unit;
109    unsigned slice;
110    unsigned part;
111    unsigned start;
112    int init;
113} dsk;
114static char cmd[512];
115static char kname[1024];
116static uint32_t opts = RB_BOOTINFO;
117static struct bootinfo bootinfo;
118static uint8_t ioctrl = IO_KEYBOARD;
119
120void exit(int);
121static void load(const char *);
122static int parse(char *);
123static int xfsread(ino_t, void *, size_t);
124static int dskread(void *, unsigned, unsigned);
125static int printf(const char *,...);
126static int putchar(int);
127static uint32_t memsize(int);
128static int drvread(void *, unsigned, unsigned);
129static int keyhit(unsigned);
130static int xputc(int);
131static int xgetc(int);
132static int getc(int);
133
134#if 1
135#define memcpy __builtin_memcpy
136#else
137static void memcpy(char *, const char *, int);
138static void
139memcpy(char *dst, const char *src, int len)
140{
141    while (len--)
142	*dst++ = *src++;
143}
144#endif
145
146static inline int
147strcmp(const char *s1, const char *s2)
148{
149    for (; *s1 == *s2 && *s1; s1++, s2++);
150    return (u_char)*s1 - (u_char)*s2;
151}
152
153#include "ufsread.c"
154
155static int
156xfsread(ino_t inode, void *buf, size_t nbyte)
157{
158    if (fsread(inode, buf, nbyte) != nbyte) {
159	printf("Invalid %s\n", "format");
160	return -1;
161    }
162    return 0;
163}
164
165static inline void
166getstr(char *str, int size)
167{
168    char *s;
169    int c;
170
171    s = str;
172    for (;;) {
173	switch (c = xgetc(0)) {
174	case 0:
175	    break;
176	case '\177':
177	    c = '\b';
178	case '\b':
179	    if (s > str) {
180		s--;
181		putchar('\b');
182		putchar(' ');
183	    } else
184		c = 0;
185	    break;
186	case '\n':
187	case '\r':
188	    *s = 0;
189	    return;
190	default:
191	    if (s - str < size - 1)
192		*s++ = c;
193	}
194	if (c)
195	    putchar(c);
196    }
197}
198
199static inline uint32_t
200drvinfo(int drive)
201{
202    v86.addr = 0x13;
203    v86.eax = 0x800;
204    v86.edx = DRV_HARD + drive;
205    v86int();
206    if (V86_CY(v86.efl))
207	return 0x4f010f;
208    return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) |
209	   (v86.edx & 0xff00) | (v86.ecx & 0x3f);
210}
211
212static inline void
213putc(int c)
214{
215    v86.addr = 0x10;
216    v86.eax = 0xe00 | (c & 0xff);
217    v86.ebx = 0x7;
218    v86int();
219}
220
221int
222main(void)
223{
224    int autoboot, i;
225    ino_t ino;
226
227    dmadat = (void *)(roundup2(__base + _end, 0x10000) - __base);
228    v86.ctl = V86_FLAGS;
229    dsk.drive = *(uint8_t *)PTOV(ARGS);
230    dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
231    dsk.unit = dsk.drive & DRV_MASK;
232    dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
233    bootinfo.bi_version = BOOTINFO_VERSION;
234    bootinfo.bi_size = sizeof(bootinfo);
235    bootinfo.bi_basemem = 0;	/* XXX will be filled by loader or kernel */
236    bootinfo.bi_extmem = memsize(MEM_EXT);
237    bootinfo.bi_memsizes_valid++;
238    for (i = 0; i < N_BIOS_GEOM; i++)
239	bootinfo.bi_bios_geom[i] = drvinfo(i);
240
241    /* Process configuration file */
242
243    autoboot = 1;
244
245    if ((ino = lookup(PATH_CONFIG)))
246	fsread(ino, cmd, sizeof(cmd));
247
248    if (*cmd) {
249	printf("%s: %s", PATH_CONFIG, cmd);
250	if (parse(cmd))
251	    autoboot = 0;
252	/* Do not process this command twice */
253	*cmd = 0;
254    }
255
256    /*
257     * Try to exec stage 3 boot loader. If interrupted by a keypress,
258     * or in case of failure, try to load a kernel directly instead.
259     */
260
261    if (autoboot && !*kname) {
262	memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
263	if (!keyhit(3*SECOND)) {
264	    load(kname);
265	    memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
266	}
267    }
268
269    /* Present the user with the boot2 prompt. */
270
271    for (;;) {
272	printf(" \n>> FreeBSD/i386 BOOT\n"
273	       "Default: %u:%s(%u,%c)%s\n"
274	       "boot: ",
275	       dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
276	       'a' + dsk.part, kname);
277	if (ioctrl & IO_SERIAL)
278	    sio_flush();
279	if (!autoboot || keyhit(5*SECOND))
280	    getstr(cmd, sizeof(cmd));
281	else
282	    putchar('\n');
283	autoboot = 0;
284	if (parse(cmd))
285	    putchar('\a');
286	else
287	    load(kname);
288    }
289}
290
291/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
292void
293exit(int x)
294{
295}
296
297static void
298load(const char *fname)
299{
300    union {
301	struct exec ex;
302	Elf32_Ehdr eh;
303    } hdr;
304    Elf32_Phdr ep[2];
305    Elf32_Shdr es[2];
306    caddr_t p;
307    ino_t ino;
308    uint32_t addr, x;
309    int fmt, i, j;
310
311    if (!(ino = lookup(fname))) {
312	if (!ls)
313	    printf("No %s\n", fname);
314	return;
315    }
316    if (xfsread(ino, &hdr, sizeof(hdr)))
317	return;
318    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
319	fmt = 0;
320    else if (IS_ELF(hdr.eh))
321	fmt = 1;
322    else {
323	printf("Invalid %s\n", "format");
324	return;
325    }
326    if (fmt == 0) {
327	addr = hdr.ex.a_entry & 0xffffff;
328	p = PTOV(addr);
329	fs_off = PAGE_SIZE;
330	if (xfsread(ino, p, hdr.ex.a_text))
331	    return;
332	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
333	if (xfsread(ino, p, hdr.ex.a_data))
334	    return;
335	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
336	bootinfo.bi_symtab = VTOP(p);
337	memcpy(p, (char *)&hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
338	p += sizeof(hdr.ex.a_syms);
339	if (hdr.ex.a_syms) {
340	    if (xfsread(ino, p, hdr.ex.a_syms))
341		return;
342	    p += hdr.ex.a_syms;
343	    if (xfsread(ino, p, sizeof(int)))
344		return;
345	    x = *(uint32_t *)p;
346	    p += sizeof(int);
347	    x -= sizeof(int);
348	    if (xfsread(ino, p, x))
349		return;
350	    p += x;
351	}
352    } else {
353	fs_off = hdr.eh.e_phoff;
354	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
355	    if (xfsread(ino, ep + j, sizeof(ep[0])))
356		return;
357	    if (ep[j].p_type == PT_LOAD)
358		j++;
359	}
360	for (i = 0; i < 2; i++) {
361	    p = PTOV(ep[i].p_paddr & 0xffffff);
362	    fs_off = ep[i].p_offset;
363	    if (xfsread(ino, p, ep[i].p_filesz))
364		return;
365	}
366	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
367	bootinfo.bi_symtab = VTOP(p);
368	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
369	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
370		(hdr.eh.e_shstrndx + 1);
371	    if (xfsread(ino, &es, sizeof(es)))
372		return;
373	    for (i = 0; i < 2; i++) {
374		memcpy(p, (char *)&es[i].sh_size, sizeof(es[i].sh_size));
375		p += sizeof(es[i].sh_size);
376		fs_off = es[i].sh_offset;
377		if (xfsread(ino, p, es[i].sh_size))
378		    return;
379		p += es[i].sh_size;
380	    }
381	}
382	addr = hdr.eh.e_entry & 0xffffff;
383    }
384    bootinfo.bi_esymtab = VTOP(p);
385    bootinfo.bi_kernelname = VTOP(fname);
386    bootinfo.bi_bios_dev = dsk.drive;
387    __exec((caddr_t)addr, opts & RBX_MASK,
388	   MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
389	   0, 0, 0, VTOP(&bootinfo));
390}
391
392static int
393parse(char *arg)
394{
395    char *p, *q;
396    int drv, c, i;
397
398    while ((c = *arg++)) {
399	if (c == ' ' || c == '\t' || c == '\n')
400	    continue;
401	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
402	if (*p)
403	    *p++ = 0;
404	if (c == '-') {
405	    while ((c = *arg++)) {
406		for (i = 0; c != optstr[i]; i++)
407		    if (i == NOPT - 1)
408			return -1;
409		opts ^= 1 << flags[i];
410	    }
411	    if (opts & 1 << RBX_PROBEKBD) {
412		i = *(uint8_t *)PTOV(0x496) & 0x10;
413		/* printf("Keyboard: %s\n", i ? "yes" : "no"); */
414		if (!i)
415		    opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
416		opts &= ~(1 << RBX_PROBEKBD);
417	    }
418	    ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
419		     opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
420	    if (ioctrl & IO_SERIAL)
421	        sio_init();
422	} else {
423	    for (q = arg--; *q && *q != '('; q++);
424	    if (*q) {
425		drv = -1;
426		if (arg[1] == ':') {
427		    if (*arg < '0' || *arg > '9')
428			return -1;
429		    drv = *arg - '0';
430		    arg += 2;
431		}
432		if (q - arg != 2)
433		    return -1;
434		for (i = 0; arg[0] != dev_nm[i][0] ||
435			    arg[1] != dev_nm[i][1]; i++)
436		    if (i == NDEV - 1)
437			return -1;
438		dsk.type = i;
439		arg += 3;
440		if (arg[1] != ',' || *arg < '0' || *arg > '9')
441		    return -1;
442		dsk.unit = *arg - '0';
443		arg += 2;
444		dsk.slice = WHOLE_DISK_SLICE;
445		if (arg[1] == ',') {
446		    if (*arg < '0' || *arg > '0' + NDOSPART)
447			return -1;
448		    if ((dsk.slice = *arg - '0'))
449			dsk.slice++;
450		    arg += 2;
451		}
452		if (arg[1] != ')' || *arg < 'a' || *arg > 'p')
453		    return -1;
454		dsk.part = *arg - 'a';
455		arg += 2;
456		if (drv == -1)
457		    drv = dsk.unit;
458		dsk.drive = (dsk.type <= TYPE_MAXHARD
459			     ? DRV_HARD : 0) + drv;
460		dsk_meta = 0;
461		fsread(0, NULL, 0);
462	    }
463	    if ((i = p - arg - !*(p - 1))) {
464		if (i >= sizeof(kname))
465		    return -1;
466		memcpy(kname, arg, i + 1);
467	    }
468	}
469	arg = p;
470    }
471    return 0;
472}
473
474static int
475dskread(void *buf, unsigned lba, unsigned nblk)
476{
477    struct dos_partition *dp;
478    struct disklabel *d;
479    char *sec;
480    unsigned sl, i;
481
482    if (!dsk_meta) {
483	sec = dmadat->secbuf;
484	dsk.start = 0;
485	if (drvread(sec, DOSBBSECTOR, 1))
486	    return -1;
487	dp = (void *)(sec + DOSPARTOFF);
488	sl = dsk.slice;
489	if (sl < BASE_SLICE) {
490	    for (i = 0; i < NDOSPART; i++)
491		if (dp[i].dp_typ == DOSPTYP_386BSD &&
492		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
493		    sl = BASE_SLICE + i;
494		    if (dp[i].dp_flag & 0x80 ||
495			dsk.slice == COMPATIBILITY_SLICE)
496			break;
497		}
498	    if (dsk.slice == WHOLE_DISK_SLICE)
499		dsk.slice = sl;
500	}
501	if (sl != WHOLE_DISK_SLICE) {
502	    if (sl != COMPATIBILITY_SLICE)
503		dp += sl - BASE_SLICE;
504	    if (dp->dp_typ != DOSPTYP_386BSD) {
505		printf("Invalid %s\n", "slice");
506		return -1;
507	    }
508	    dsk.start = dp->dp_start;
509	}
510	if (drvread(sec, dsk.start + LABELSECTOR, 1))
511		return -1;
512	d = (void *)(sec + LABELOFFSET);
513	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
514	    if (dsk.part != RAW_PART) {
515		printf("Invalid %s\n", "label");
516		return -1;
517	    }
518	} else {
519	    if (!dsk.init) {
520		if (d->d_type == DTYPE_SCSI)
521		    dsk.type = TYPE_DA;
522		dsk.init++;
523	    }
524	    if (dsk.part >= d->d_npartitions ||
525		!d->d_partitions[dsk.part].p_size) {
526		printf("Invalid %s\n", "partition");
527		return -1;
528	    }
529	    dsk.start = d->d_partitions[dsk.part].p_offset;
530	}
531    }
532    return drvread(buf, dsk.start + lba, nblk);
533}
534
535static int
536printf(const char *fmt,...)
537{
538    static const char digits[16] = "0123456789abcdef";
539    va_list ap;
540    char buf[10];
541    char *s;
542    unsigned r, u;
543    int c;
544
545    va_start(ap, fmt);
546    while ((c = *fmt++)) {
547	if (c == '%') {
548	    c = *fmt++;
549	    switch (c) {
550	    case 'c':
551		putchar(va_arg(ap, int));
552		continue;
553	    case 's':
554		for (s = va_arg(ap, char *); *s; s++)
555		    putchar(*s);
556		continue;
557	    case 'u':
558	    case 'x':
559		r = c == 'u' ? 10U : 16U;
560		u = va_arg(ap, unsigned);
561		s = buf;
562		do
563		    *s++ = digits[u % r];
564		while (u /= r);
565		while (--s >= buf)
566		    putchar(*s);
567		continue;
568	    }
569	}
570	putchar(c);
571    }
572    va_end(ap);
573    return 0;
574}
575
576static int
577putchar(int c)
578{
579    if (c == '\n')
580	xputc('\r');
581    return xputc(c);
582}
583
584static uint32_t
585memsize(int type)
586{
587    v86.addr = type;
588    v86.eax = 0x8800;
589    v86int();
590    return v86.eax;
591}
592
593static int
594drvread(void *buf, unsigned lba, unsigned nblk)
595{
596    static unsigned c = 0x2d5c7c2f;
597
598    printf("%c\b", c = c << 8 | c >> 24);
599    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
600    v86.addr = XREADORG;		/* call to xread in boot1 */
601    v86.es = VTOPSEG(buf);
602    v86.eax = lba;
603    v86.ebx = VTOPOFF(buf);
604    v86.ecx = lba >> 16;
605    v86.edx = nblk << 8 | dsk.drive;
606    v86int();
607    v86.ctl = V86_FLAGS;
608    if (V86_CY(v86.efl)) {
609	printf("Disk error 0x%x (lba=0x%x)\n", v86.eax >> 8 & 0xff,
610	       lba);
611	return -1;
612    }
613    return 0;
614}
615
616static int
617keyhit(unsigned ticks)
618{
619    uint32_t t0, t1;
620
621    if (opts & 1 << RBX_NOINTR)
622	return 0;
623    t0 = 0;
624    for (;;) {
625	if (xgetc(1))
626	    return 1;
627	t1 = *(uint32_t *)PTOV(0x46c);
628	if (!t0)
629	    t0 = t1;
630	if (t1 < t0 || t1 >= t0 + ticks)
631	    return 0;
632    }
633}
634
635static int
636xputc(int c)
637{
638    if (ioctrl & IO_KEYBOARD)
639	putc(c);
640    if (ioctrl & IO_SERIAL)
641	sio_putc(c);
642    return c;
643}
644
645static int
646xgetc(int fn)
647{
648    if (opts & 1 << RBX_NOINTR)
649	return 0;
650    for (;;) {
651	if (ioctrl & IO_KEYBOARD && getc(1))
652	    return fn ? 1 : getc(0);
653	if (ioctrl & IO_SERIAL && sio_ischar())
654	    return fn ? 1 : sio_getc();
655	if (fn)
656	    return 0;
657    }
658}
659
660static int
661getc(int fn)
662{
663    v86.addr = 0x16;
664    v86.eax = fn << 8;
665    v86int();
666    return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
667}
668