gptboot.c revision 104635 
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 104635 2002-10-07 21:36:06Z 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_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#ifdef UFS1_ONLY
273	printf(" \n>> FreeBSD/i386/UFS1 BOOT\n"
274#else
275	printf(" \n>> FreeBSD/i386/UFS[12] BOOT\n"
276#endif
277	       "Default: %u:%s(%u,%c)%s\n"
278	       "boot: ",
279	       dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
280	       'a' + dsk.part, kname);
281	if (ioctrl & IO_SERIAL)
282	    sio_flush();
283	if (!autoboot || keyhit(5*SECOND))
284	    getstr(cmd, sizeof(cmd));
285	else
286	    putchar('\n');
287	autoboot = 0;
288	if (parse(cmd))
289	    putchar('\a');
290	else
291	    load(kname);
292    }
293}
294
295/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
296void
297exit(int x)
298{
299}
300
301static void
302load(const char *fname)
303{
304    union {
305	struct exec ex;
306	Elf32_Ehdr eh;
307    } hdr;
308    Elf32_Phdr ep[2];
309    Elf32_Shdr es[2];
310    caddr_t p;
311    ino_t ino;
312    uint32_t addr, x;
313    int fmt, i, j;
314
315    if (!(ino = lookup(fname))) {
316	if (!ls)
317	    printf("No %s\n", fname);
318	return;
319    }
320    if (xfsread(ino, &hdr, sizeof(hdr)))
321	return;
322    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
323	fmt = 0;
324    else if (IS_ELF(hdr.eh))
325	fmt = 1;
326    else {
327	printf("Invalid %s\n", "format");
328	return;
329    }
330    if (fmt == 0) {
331	addr = hdr.ex.a_entry & 0xffffff;
332	p = PTOV(addr);
333	fs_off = PAGE_SIZE;
334	if (xfsread(ino, p, hdr.ex.a_text))
335	    return;
336	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
337	if (xfsread(ino, p, hdr.ex.a_data))
338	    return;
339	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
340	bootinfo.bi_symtab = VTOP(p);
341	memcpy(p, (char *)&hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
342	p += sizeof(hdr.ex.a_syms);
343	if (hdr.ex.a_syms) {
344	    if (xfsread(ino, p, hdr.ex.a_syms))
345		return;
346	    p += hdr.ex.a_syms;
347	    if (xfsread(ino, p, sizeof(int)))
348		return;
349	    x = *(uint32_t *)p;
350	    p += sizeof(int);
351	    x -= sizeof(int);
352	    if (xfsread(ino, p, x))
353		return;
354	    p += x;
355	}
356    } else {
357	fs_off = hdr.eh.e_phoff;
358	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
359	    if (xfsread(ino, ep + j, sizeof(ep[0])))
360		return;
361	    if (ep[j].p_type == PT_LOAD)
362		j++;
363	}
364	for (i = 0; i < 2; i++) {
365	    p = PTOV(ep[i].p_paddr & 0xffffff);
366	    fs_off = ep[i].p_offset;
367	    if (xfsread(ino, p, ep[i].p_filesz))
368		return;
369	}
370	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
371	bootinfo.bi_symtab = VTOP(p);
372	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
373	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
374		(hdr.eh.e_shstrndx + 1);
375	    if (xfsread(ino, &es, sizeof(es)))
376		return;
377	    for (i = 0; i < 2; i++) {
378		memcpy(p, (char *)&es[i].sh_size, sizeof(es[i].sh_size));
379		p += sizeof(es[i].sh_size);
380		fs_off = es[i].sh_offset;
381		if (xfsread(ino, p, es[i].sh_size))
382		    return;
383		p += es[i].sh_size;
384	    }
385	}
386	addr = hdr.eh.e_entry & 0xffffff;
387    }
388    bootinfo.bi_esymtab = VTOP(p);
389    bootinfo.bi_kernelname = VTOP(fname);
390    bootinfo.bi_bios_dev = dsk.drive;
391    __exec((caddr_t)addr, opts & RBX_MASK,
392	   MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
393	   0, 0, 0, VTOP(&bootinfo));
394}
395
396static int
397parse(char *arg)
398{
399    char *p, *q;
400    int drv, c, i;
401
402    while ((c = *arg++)) {
403	if (c == ' ' || c == '\t' || c == '\n')
404	    continue;
405	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
406	if (*p)
407	    *p++ = 0;
408	if (c == '-') {
409	    while ((c = *arg++)) {
410		for (i = 0; c != optstr[i]; i++)
411		    if (i == NOPT - 1)
412			return -1;
413		opts ^= 1 << flags[i];
414	    }
415	    if (opts & 1 << RBX_PROBEKBD) {
416		i = *(uint8_t *)PTOV(0x496) & 0x10;
417		/* printf("Keyboard: %s\n", i ? "yes" : "no"); */
418		if (!i)
419		    opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
420		opts &= ~(1 << RBX_PROBEKBD);
421	    }
422	    ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
423		     opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
424	    if (ioctrl & IO_SERIAL)
425	        sio_init();
426	} else {
427	    for (q = arg--; *q && *q != '('; q++);
428	    if (*q) {
429		drv = -1;
430		if (arg[1] == ':') {
431		    if (*arg < '0' || *arg > '9')
432			return -1;
433		    drv = *arg - '0';
434		    arg += 2;
435		}
436		if (q - arg != 2)
437		    return -1;
438		for (i = 0; arg[0] != dev_nm[i][0] ||
439			    arg[1] != dev_nm[i][1]; i++)
440		    if (i == NDEV - 1)
441			return -1;
442		dsk.type = i;
443		arg += 3;
444		if (arg[1] != ',' || *arg < '0' || *arg > '9')
445		    return -1;
446		dsk.unit = *arg - '0';
447		arg += 2;
448		dsk.slice = WHOLE_DISK_SLICE;
449		if (arg[1] == ',') {
450		    if (*arg < '0' || *arg > '0' + NDOSPART)
451			return -1;
452		    if ((dsk.slice = *arg - '0'))
453			dsk.slice++;
454		    arg += 2;
455		}
456		if (arg[1] != ')' || *arg < 'a' || *arg > 'p')
457		    return -1;
458		dsk.part = *arg - 'a';
459		arg += 2;
460		if (drv == -1)
461		    drv = dsk.unit;
462		dsk.drive = (dsk.type <= TYPE_MAXHARD
463			     ? DRV_HARD : 0) + drv;
464		dsk_meta = 0;
465		fsread(0, NULL, 0);
466	    }
467	    if ((i = p - arg - !*(p - 1))) {
468		if (i >= sizeof(kname))
469		    return -1;
470		memcpy(kname, arg, i + 1);
471	    }
472	}
473	arg = p;
474    }
475    return 0;
476}
477
478static int
479dskread(void *buf, unsigned lba, unsigned nblk)
480{
481    struct dos_partition *dp;
482    struct disklabel *d;
483    char *sec;
484    unsigned sl, i;
485
486    if (!dsk_meta) {
487	sec = dmadat->secbuf;
488	dsk.start = 0;
489	if (drvread(sec, DOSBBSECTOR, 1))
490	    return -1;
491	dp = (void *)(sec + DOSPARTOFF);
492	sl = dsk.slice;
493	if (sl < BASE_SLICE) {
494	    for (i = 0; i < NDOSPART; i++)
495		if (dp[i].dp_typ == DOSPTYP_386BSD &&
496		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
497		    sl = BASE_SLICE + i;
498		    if (dp[i].dp_flag & 0x80 ||
499			dsk.slice == COMPATIBILITY_SLICE)
500			break;
501		}
502	    if (dsk.slice == WHOLE_DISK_SLICE)
503		dsk.slice = sl;
504	}
505	if (sl != WHOLE_DISK_SLICE) {
506	    if (sl != COMPATIBILITY_SLICE)
507		dp += sl - BASE_SLICE;
508	    if (dp->dp_typ != DOSPTYP_386BSD) {
509		printf("Invalid %s\n", "slice");
510		return -1;
511	    }
512	    dsk.start = dp->dp_start;
513	}
514	if (drvread(sec, dsk.start + LABELSECTOR, 1))
515		return -1;
516	d = (void *)(sec + LABELOFFSET);
517	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
518	    if (dsk.part != RAW_PART) {
519		printf("Invalid %s\n", "label");
520		return -1;
521	    }
522	} else {
523	    if (!dsk.init) {
524		if (d->d_type == DTYPE_SCSI)
525		    dsk.type = TYPE_DA;
526		dsk.init++;
527	    }
528	    if (dsk.part >= d->d_npartitions ||
529		!d->d_partitions[dsk.part].p_size) {
530		printf("Invalid %s\n", "partition");
531		return -1;
532	    }
533	    dsk.start += d->d_partitions[dsk.part].p_offset;
534	    dsk.start -= d->d_partitions[RAW_PART].p_offset;
535	}
536    }
537    return drvread(buf, dsk.start + lba, nblk);
538}
539
540static int
541printf(const char *fmt,...)
542{
543    static const char digits[16] = "0123456789abcdef";
544    va_list ap;
545    char buf[10];
546    char *s;
547    unsigned r, u;
548    int c;
549
550    va_start(ap, fmt);
551    while ((c = *fmt++)) {
552	if (c == '%') {
553	    c = *fmt++;
554	    switch (c) {
555	    case 'c':
556		putchar(va_arg(ap, int));
557		continue;
558	    case 's':
559		for (s = va_arg(ap, char *); *s; s++)
560		    putchar(*s);
561		continue;
562	    case 'u':
563	    case 'x':
564		r = c == 'u' ? 10U : 16U;
565		u = va_arg(ap, unsigned);
566		s = buf;
567		do
568		    *s++ = digits[u % r];
569		while (u /= r);
570		while (--s >= buf)
571		    putchar(*s);
572		continue;
573	    }
574	}
575	putchar(c);
576    }
577    va_end(ap);
578    return 0;
579}
580
581static int
582putchar(int c)
583{
584    if (c == '\n')
585	xputc('\r');
586    return xputc(c);
587}
588
589static uint32_t
590memsize(int type)
591{
592    v86.addr = type;
593    v86.eax = 0x8800;
594    v86int();
595    return v86.eax;
596}
597
598static int
599drvread(void *buf, unsigned lba, unsigned nblk)
600{
601    static unsigned c = 0x2d5c7c2f;
602
603    printf("%c\b", c = c << 8 | c >> 24);
604    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
605    v86.addr = XREADORG;		/* call to xread in boot1 */
606    v86.es = VTOPSEG(buf);
607    v86.eax = lba;
608    v86.ebx = VTOPOFF(buf);
609    v86.ecx = lba >> 16;
610    v86.edx = nblk << 8 | dsk.drive;
611    v86int();
612    v86.ctl = V86_FLAGS;
613    if (V86_CY(v86.efl)) {
614	printf("Disk error 0x%x (lba=0x%x)\n", v86.eax >> 8 & 0xff,
615	       lba);
616	return -1;
617    }
618    return 0;
619}
620
621static int
622keyhit(unsigned ticks)
623{
624    uint32_t t0, t1;
625
626    if (opts & 1 << RBX_NOINTR)
627	return 0;
628    t0 = 0;
629    for (;;) {
630	if (xgetc(1))
631	    return 1;
632	t1 = *(uint32_t *)PTOV(0x46c);
633	if (!t0)
634	    t0 = t1;
635	if (t1 < t0 || t1 >= t0 + ticks)
636	    return 0;
637    }
638}
639
640static int
641xputc(int c)
642{
643    if (ioctrl & IO_KEYBOARD)
644	putc(c);
645    if (ioctrl & IO_SERIAL)
646	sio_putc(c);
647    return c;
648}
649
650static int
651xgetc(int fn)
652{
653    if (opts & 1 << RBX_NOINTR)
654	return 0;
655    for (;;) {
656	if (ioctrl & IO_KEYBOARD && getc(1))
657	    return fn ? 1 : getc(0);
658	if (ioctrl & IO_SERIAL && sio_ischar())
659	    return fn ? 1 : sio_getc();
660	if (fn)
661	    return 0;
662    }
663}
664
665static int
666getc(int fn)
667{
668    v86.addr = 0x16;
669    v86.eax = fn << 8;
670    v86int();
671    return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
672}
673