gptboot.c revision 97860 
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 97860 2002-06-05 11:10:38Z 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/dirent.h>
25#include <machine/bootinfo.h>
26#include <machine/elf.h>
27
28#include <stdarg.h>
29
30#include <a.out.h>
31
32#include <btxv86.h>
33
34#include "boot2.h"
35#include "lib.h"
36
37#define IO_KEYBOARD	1
38#define IO_SERIAL	2
39
40#define SECOND		18	/* Circa that many ticks in a second. */
41
42#define RBX_ASKNAME	0x0	/* -a */
43#define RBX_SINGLE	0x1	/* -s */
44#define RBX_DFLTROOT	0x5	/* -r */
45#define RBX_KDB 	0x6	/* -d */
46#define RBX_CONFIG	0xa	/* -c */
47#define RBX_VERBOSE	0xb	/* -v */
48#define RBX_SERIAL	0xc	/* -h */
49#define RBX_CDROM	0xd	/* -C */
50#define RBX_GDB 	0xf	/* -g */
51#define RBX_MUTE	0x10	/* -m */
52#define RBX_PAUSE	0x12	/* -p */
53#define RBX_DUAL	0x1d	/* -D */
54#define RBX_PROBEKBD	0x1e	/* -P */
55#define RBX_NOINTR	0x1f	/* -n */
56
57#define RBX_MASK	0x2005ffff
58
59#define PATH_CONFIG	"/boot.config"
60#define PATH_BOOT3	"/boot/loader"
61#define PATH_KERNEL	"/kernel"
62
63#define ARGS		0x900
64#define NOPT		14
65#define NDEV		5
66#define MEM_BASE	0x12
67#define MEM_EXT 	0x15
68#define V86_CY(x)	((x) & 1)
69#define V86_ZR(x)	((x) & 0x40)
70
71#define DRV_HARD	0x80
72#define DRV_MASK	0x7f
73
74#define TYPE_AD		0
75#define TYPE_WD		1
76#define TYPE_WFD 	2
77#define TYPE_FD		3
78#define TYPE_DA		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[] = {"ad", "wd", "  ", "fd", "da"};
101static const unsigned dev_maj[] = {30, 0, 1, 2, 4};
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;
115static struct bootinfo bootinfo;
116static uint8_t ioctrl = IO_KEYBOARD;
117
118void exit(int);
119static void load(const char *);
120static int parse(char *);
121static ino_t lookup(const char *);
122static int xfsread(ino_t, void *, size_t);
123static ssize_t fsread(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#define memcpy __builtin_memcpy
135
136static inline void
137readfile(const char *fname, void *buf, size_t size)
138{
139    ino_t ino;
140
141    if ((ino = lookup(fname)))
142	fsread(ino, buf, size);
143}
144
145static inline int
146strcmp(const char *s1, const char *s2)
147{
148    for (; *s1 == *s2 && *s1; s1++, s2++);
149    return (u_char)*s1 - (u_char)*s2;
150}
151
152#include "ufsread.c"
153
154static inline int
155getchar(void)
156{
157    int c;
158
159    c = xgetc(0);
160    if (c == '\r')
161	c = '\n';
162    return c;
163}
164
165static inline void
166getstr(char *str, int size)
167{
168    char *s;
169    int c;
170
171    s = str;
172    do {
173	switch (c = getchar()) {
174	case 0:
175	    break;
176	case '\b':
177	case '\177':
178	    if (s > str) {
179		s--;
180		putchar('\b');
181		putchar(' ');
182	    } else
183		c = 0;
184	    break;
185	case '\n':
186	    *s = 0;
187	    break;
188	default:
189	    if (s - str < size - 1)
190		*s++ = c;
191	}
192	if (c)
193	    putchar(c);
194    } while (c != '\n');
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
224    dmadat = (void *)(roundup2(__base + _end, 0x10000) - __base);
225    v86.ctl = V86_FLAGS;
226    dsk.drive = *(uint8_t *)PTOV(ARGS);
227    dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
228    dsk.unit = dsk.drive & DRV_MASK;
229    dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
230    bootinfo.bi_version = BOOTINFO_VERSION;
231    bootinfo.bi_size = sizeof(bootinfo);
232    bootinfo.bi_basemem = memsize(MEM_BASE);
233    bootinfo.bi_extmem = memsize(MEM_EXT);
234    bootinfo.bi_memsizes_valid++;
235    for (i = 0; i < N_BIOS_GEOM; i++)
236	bootinfo.bi_bios_geom[i] = drvinfo(i);
237
238    /* Process configuration file */
239
240    autoboot = 1;
241    readfile(PATH_CONFIG, cmd, sizeof(cmd));
242    if (*cmd) {
243	printf("%s: %s", PATH_CONFIG, cmd);
244	if (parse(cmd))
245	    autoboot = 0;
246	/* Do not process this command twice */
247	*cmd = 0;
248    }
249
250    /*
251     * Try to exec stage 3 boot loader. If interrupted by a keypress,
252     * or in case of failure, try to load a kernel directly instead.
253     */
254
255    if (autoboot && !*kname) {
256	memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
257	if (!keyhit(3*SECOND)) {
258	    load(kname);
259	    memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
260	}
261    }
262
263    /* Present the user with the boot2 prompt. */
264
265    for (;;) {
266	printf(" \n>> FreeBSD/i386 BOOT\n"
267	       "Default: %u:%s(%u,%c)%s\n"
268	       "boot: ",
269	       dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
270	       'a' + dsk.part, kname);
271	if (ioctrl & IO_SERIAL)
272	    sio_flush();
273	if (!autoboot || keyhit(5*SECOND))
274	    getstr(cmd, sizeof(cmd));
275	else
276	    putchar('\n');
277	autoboot = 0;
278	if (parse(cmd))
279	    putchar('\a');
280	else
281	    load(kname);
282    }
283}
284
285/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
286void
287exit(int x)
288{
289}
290
291static void
292load(const char *fname)
293{
294    union {
295	struct exec ex;
296	Elf32_Ehdr eh;
297    } hdr;
298    Elf32_Phdr ep[2];
299    Elf32_Shdr es[2];
300    caddr_t p;
301    ino_t ino;
302    uint32_t addr, x;
303    int fmt, i, j;
304
305    if (!(ino = lookup(fname))) {
306	if (!ls)
307	    printf("No %s\n", fname);
308	return;
309    }
310    if (xfsread(ino, &hdr, sizeof(hdr)))
311	return;
312    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
313	fmt = 0;
314    else if (IS_ELF(hdr.eh))
315	fmt = 1;
316    else {
317	printf("Invalid %s\n", "format");
318	return;
319    }
320    if (fmt == 0) {
321	addr = hdr.ex.a_entry & 0xffffff;
322	p = PTOV(addr);
323	fs_off = PAGE_SIZE;
324	if (xfsread(ino, p, hdr.ex.a_text))
325	    return;
326	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
327	if (xfsread(ino, p, hdr.ex.a_data))
328	    return;
329	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
330	bootinfo.bi_symtab = VTOP(p);
331	memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
332	p += sizeof(hdr.ex.a_syms);
333	if (hdr.ex.a_syms) {
334	    if (xfsread(ino, p, hdr.ex.a_syms))
335		return;
336	    p += hdr.ex.a_syms;
337	    if (xfsread(ino, p, sizeof(int)))
338		return;
339	    x = *(uint32_t *)p;
340	    p += sizeof(int);
341	    x -= sizeof(int);
342	    if (xfsread(ino, p, x))
343		return;
344	    p += x;
345	}
346    } else {
347	fs_off = hdr.eh.e_phoff;
348	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
349	    if (xfsread(ino, ep + j, sizeof(ep[0])))
350		return;
351	    if (ep[j].p_type == PT_LOAD)
352		j++;
353	}
354	for (i = 0; i < 2; i++) {
355	    p = PTOV(ep[i].p_paddr & 0xffffff);
356	    fs_off = ep[i].p_offset;
357	    if (xfsread(ino, p, ep[i].p_filesz))
358		return;
359	}
360	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
361	bootinfo.bi_symtab = VTOP(p);
362	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
363	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
364		(hdr.eh.e_shstrndx + 1);
365	    if (xfsread(ino, &es, sizeof(es)))
366		return;
367	    for (i = 0; i < 2; i++) {
368		memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
369		p += sizeof(es[i].sh_size);
370		fs_off = es[i].sh_offset;
371		if (xfsread(ino, p, es[i].sh_size))
372		    return;
373		p += es[i].sh_size;
374	    }
375	}
376	addr = hdr.eh.e_entry & 0xffffff;
377    }
378    bootinfo.bi_esymtab = VTOP(p);
379    bootinfo.bi_kernelname = VTOP(fname);
380    bootinfo.bi_bios_dev = dsk.drive;
381    __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
382	   MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
383	   0, 0, 0, VTOP(&bootinfo));
384}
385
386static int
387parse(char *arg)
388{
389    char *p, *q;
390    int drv, c, i;
391
392    while ((c = *arg++)) {
393	if (c == ' ' || c == '\t' || c == '\n')
394	    continue;
395	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
396	if (*p)
397	    *p++ = 0;
398	if (c == '-') {
399	    while ((c = *arg++)) {
400		for (i = 0; c != optstr[i]; i++)
401		    if (i == NOPT - 1)
402			return -1;
403		opts ^= 1 << flags[i];
404	    }
405	    if (opts & 1 << RBX_PROBEKBD) {
406		i = *(uint8_t *)PTOV(0x496) & 0x10;
407		printf("Keyboard: %s\n", i ? "yes" : "no");
408		if (!i)
409		    opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
410		opts &= ~(1 << RBX_PROBEKBD);
411	    }
412	    ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
413		     opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
414	    if (ioctrl & IO_SERIAL)
415	        sio_init();
416	} else {
417	    for (q = arg--; *q && *q != '('; q++);
418	    if (*q) {
419		drv = -1;
420		if (arg[1] == ':') {
421		    if (*arg < '0' || *arg > '9')
422			return -1;
423		    drv = *arg - '0';
424		    arg += 2;
425		}
426		if (q - arg != 2)
427		    return -1;
428		for (i = 0; arg[0] != dev_nm[i][0] ||
429			    arg[1] != dev_nm[i][1]; i++)
430		    if (i == NDEV - 1)
431			return -1;
432		dsk.type = i;
433		arg += 3;
434		if (arg[1] != ',' || *arg < '0' || *arg > '9')
435		    return -1;
436		dsk.unit = *arg - '0';
437		arg += 2;
438		dsk.slice = WHOLE_DISK_SLICE;
439		if (arg[1] == ',') {
440		    if (*arg < '0' || *arg > '0' + NDOSPART)
441			return -1;
442		    if ((dsk.slice = *arg - '0'))
443			dsk.slice++;
444		    arg += 2;
445		}
446		if (arg[1] != ')' || *arg < 'a' || *arg > 'p')
447		    return -1;
448		dsk.part = *arg - 'a';
449		arg += 2;
450		if (drv == -1)
451		    drv = dsk.unit;
452		dsk.drive = (dsk.type == TYPE_WD ||
453			     dsk.type == TYPE_AD ||
454			     dsk.type == TYPE_DA ? DRV_HARD : 0) + drv;
455		dsk_meta = 0;
456		fsread(0, NULL, 0);
457	    }
458	    if ((i = p - arg - !*(p - 1))) {
459		if (i >= sizeof(kname))
460		    return -1;
461		memcpy(kname, arg, i + 1);
462	    }
463	}
464	arg = p;
465    }
466    return 0;
467}
468
469static int
470xfsread(ino_t inode, void *buf, size_t nbyte)
471{
472    if (fsread(inode, buf, nbyte) != nbyte) {
473	printf("Invalid %s\n", "format");
474	return -1;
475    }
476    return 0;
477}
478
479static int
480dskread(void *buf, unsigned lba, unsigned nblk)
481{
482    struct dos_partition *dp;
483    struct disklabel *d;
484    char *sec;
485    unsigned sl, i;
486
487    if (!dsk_meta) {
488	sec = dmadat->secbuf;
489	dsk.start = 0;
490	if (drvread(sec, DOSBBSECTOR, 1))
491	    return -1;
492	dp = (void *)(sec + DOSPARTOFF);
493	sl = dsk.slice;
494	if (sl < BASE_SLICE) {
495	    for (i = 0; i < NDOSPART; i++)
496		if (dp[i].dp_typ == DOSPTYP_386BSD &&
497		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
498		    sl = BASE_SLICE + i;
499		    if (dp[i].dp_flag & 0x80 ||
500			dsk.slice == COMPATIBILITY_SLICE)
501			break;
502		}
503	    if (dsk.slice == WHOLE_DISK_SLICE)
504		dsk.slice = sl;
505	}
506	if (sl != WHOLE_DISK_SLICE) {
507	    if (sl != COMPATIBILITY_SLICE)
508		dp += sl - BASE_SLICE;
509	    if (dp->dp_typ != DOSPTYP_386BSD) {
510		printf("Invalid %s\n", "slice");
511		return -1;
512	    }
513	    dsk.start = dp->dp_start;
514	}
515	if (drvread(sec, dsk.start + LABELSECTOR, 1))
516		return -1;
517	d = (void *)(sec + LABELOFFSET);
518	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
519	    if (dsk.part != RAW_PART) {
520		printf("Invalid %s\n", "label");
521		return -1;
522	    }
523	} else {
524	    if (!dsk.init) {
525		if (d->d_type == DTYPE_SCSI)
526		    dsk.type = TYPE_DA;
527		dsk.init++;
528	    }
529	    if (dsk.part >= d->d_npartitions ||
530		!d->d_partitions[dsk.part].p_size) {
531		printf("Invalid %s\n", "partition");
532		return -1;
533	    }
534	    dsk.start = d->d_partitions[dsk.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