gptboot.c revision 108000 
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 108000 2002-12-17 21:10:34Z imp $
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		12
66#define NDEV		3
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		1
77#define TYPE_MAXHARD	TYPE_DA
78#define TYPE_FD		2
79
80extern uint32_t _end;
81
82static const char optstr[NOPT] = "DhaCgmnPprsv";
83static const unsigned char flags[NOPT] = {
84    RBX_DUAL,
85    RBX_SERIAL,
86    RBX_ASKNAME,
87    RBX_CDROM,
88    RBX_GDB,
89    RBX_MUTE,
90    RBX_NOINTR,
91    RBX_PROBEKBD,
92    RBX_PAUSE,
93    RBX_DFLTROOT,
94    RBX_SINGLE,
95    RBX_VERBOSE
96};
97
98static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
99static const unsigned char dev_maj[NDEV] = {30, 4, 2};
100
101static struct dsk {
102    unsigned drive;
103    unsigned type;
104    unsigned unit;
105    unsigned slice;
106    unsigned part;
107    unsigned start;
108    int init;
109} dsk;
110static char cmd[512];
111static char kname[1024];
112static uint32_t opts = RB_BOOTINFO;
113static struct bootinfo bootinfo;
114static uint8_t ioctrl = IO_KEYBOARD;
115
116void exit(int);
117static void load(void);
118static int parse(void);
119static int xfsread(ino_t, void *, size_t);
120static int dskread(void *, unsigned, unsigned);
121static void printf(const char *,...);
122static void putchar(int);
123static uint32_t memsize(void);
124static int drvread(void *, unsigned, unsigned);
125static int keyhit(unsigned);
126static int xputc(int);
127static int xgetc(int);
128static int getc(int);
129
130#define memcpy __builtin_memcpy
131
132static inline int
133strcmp(const char *s1, const char *s2)
134{
135    for (; *s1 == *s2 && *s1; s1++, s2++);
136    return *s1 - *s2;
137}
138
139#include "ufsread.c"
140
141static int
142xfsread(ino_t inode, void *buf, size_t nbyte)
143{
144    if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
145	printf("Invalid %s\n", "format");
146	return -1;
147    }
148    return 0;
149}
150
151static inline uint32_t
152memsize(void)
153{
154    v86.addr = MEM_EXT;
155    v86.eax = 0x8800;
156    v86int();
157    return v86.eax;
158}
159
160static inline void
161getstr(void)
162{
163    char *s;
164    int c;
165
166    s = cmd;
167    for (;;) {
168	switch (c = xgetc(0)) {
169	case 0:
170	    continue;
171	case '\177':
172	case '\b':
173	    if (s > cmd) {
174		s--;
175		printf("\b \b");
176	    }
177	    continue;
178	case '\n':
179	case '\r':
180	    *s = 0;
181	    return;
182	default:
183	    if (s - cmd < sizeof(cmd) - 1)
184		*s++ = c;
185	}
186	putchar(c);
187    }
188}
189
190static inline void
191putc(int c)
192{
193    v86.addr = 0x10;
194    v86.eax = 0xe00 | (c & 0xff);
195    v86.ebx = 0x7;
196    v86int();
197}
198
199int
200main(void)
201{
202    int autoboot;
203    ino_t ino;
204
205    dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
206    v86.ctl = V86_FLAGS;
207    dsk.drive = *(uint8_t *)PTOV(ARGS);
208    dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
209    dsk.unit = dsk.drive & DRV_MASK;
210    dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
211    bootinfo.bi_version = BOOTINFO_VERSION;
212    bootinfo.bi_size = sizeof(bootinfo);
213    bootinfo.bi_basemem = 0;	/* XXX will be filled by loader or kernel */
214    bootinfo.bi_extmem = memsize();
215    bootinfo.bi_memsizes_valid++;
216
217    /* Process configuration file */
218
219    autoboot = 1;
220
221    if ((ino = lookup(PATH_CONFIG)))
222	fsread(ino, cmd, sizeof(cmd));
223
224    if (*cmd) {
225	printf("%s: %s", PATH_CONFIG, cmd);
226	if (parse())
227	    autoboot = 0;
228	/* Do not process this command twice */
229	*cmd = 0;
230    }
231
232    /*
233     * Try to exec stage 3 boot loader. If interrupted by a keypress,
234     * or in case of failure, try to load a kernel directly instead.
235     */
236
237    if (autoboot && !*kname) {
238	memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
239	if (!keyhit(3*SECOND)) {
240	    load();
241	    memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
242	}
243    }
244
245    /* Present the user with the boot2 prompt. */
246
247    for (;;) {
248	printf("\nFreeBSD/i386 boot\n"
249	       "Default: %u:%s(%u,%c)%s\n"
250	       "boot: ",
251	       dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
252	       'a' + dsk.part, kname);
253	if (ioctrl & IO_SERIAL)
254	    sio_flush();
255	if (!autoboot || keyhit(5*SECOND))
256	    getstr();
257	else
258	    putchar('\n');
259	autoboot = 0;
260	if (parse())
261	    putchar('\a');
262	else
263	    load();
264    }
265}
266
267/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
268void
269exit(int x)
270{
271}
272
273static void
274load(void)
275{
276    union {
277	struct exec ex;
278	Elf32_Ehdr eh;
279    } hdr;
280    Elf32_Phdr ep[2];
281    Elf32_Shdr es[2];
282    caddr_t p;
283    ino_t ino;
284    uint32_t addr, x;
285    int fmt, i, j;
286
287    if (!(ino = lookup(kname))) {
288	if (!ls)
289	    printf("No %s\n", kname);
290	return;
291    }
292    if (xfsread(ino, &hdr, sizeof(hdr)))
293	return;
294    if (N_GETMAGIC(hdr.ex) == ZMAGIC)
295	fmt = 0;
296    else if (IS_ELF(hdr.eh))
297	fmt = 1;
298    else {
299	printf("Invalid %s\n", "format");
300	return;
301    }
302    if (fmt == 0) {
303	addr = hdr.ex.a_entry & 0xffffff;
304	p = PTOV(addr);
305	fs_off = PAGE_SIZE;
306	if (xfsread(ino, p, hdr.ex.a_text))
307	    return;
308	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
309	if (xfsread(ino, p, hdr.ex.a_data))
310	    return;
311	p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
312	bootinfo.bi_symtab = VTOP(p);
313	memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
314	p += sizeof(hdr.ex.a_syms);
315	if (hdr.ex.a_syms) {
316	    if (xfsread(ino, p, hdr.ex.a_syms))
317		return;
318	    p += hdr.ex.a_syms;
319	    if (xfsread(ino, p, sizeof(int)))
320		return;
321	    x = *(uint32_t *)p;
322	    p += sizeof(int);
323	    x -= sizeof(int);
324	    if (xfsread(ino, p, x))
325		return;
326	    p += x;
327	}
328    } else {
329	fs_off = hdr.eh.e_phoff;
330	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
331	    if (xfsread(ino, ep + j, sizeof(ep[0])))
332		return;
333	    if (ep[j].p_type == PT_LOAD)
334		j++;
335	}
336	for (i = 0; i < 2; i++) {
337	    p = PTOV(ep[i].p_paddr & 0xffffff);
338	    fs_off = ep[i].p_offset;
339	    if (xfsread(ino, p, ep[i].p_filesz))
340		return;
341	}
342	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
343	bootinfo.bi_symtab = VTOP(p);
344	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
345	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
346		(hdr.eh.e_shstrndx + 1);
347	    if (xfsread(ino, &es, sizeof(es)))
348		return;
349	    for (i = 0; i < 2; i++) {
350		memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
351		p += sizeof(es[i].sh_size);
352		fs_off = es[i].sh_offset;
353		if (xfsread(ino, p, es[i].sh_size))
354		    return;
355		p += es[i].sh_size;
356	    }
357	}
358	addr = hdr.eh.e_entry & 0xffffff;
359    }
360    bootinfo.bi_esymtab = VTOP(p);
361    bootinfo.bi_kernelname = VTOP(kname);
362    bootinfo.bi_bios_dev = dsk.drive;
363    __exec((caddr_t)addr, opts & RBX_MASK,
364	   MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
365	   0, 0, 0, VTOP(&bootinfo));
366}
367
368static int
369parse()
370{
371    char *arg = cmd;
372    char *p, *q;
373    unsigned int drv;
374    int c, i;
375
376    while ((c = *arg++)) {
377	if (c == ' ' || c == '\t' || c == '\n')
378	    continue;
379	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
380	if (*p)
381	    *p++ = 0;
382	if (c == '-') {
383	    while ((c = *arg++)) {
384		for (i = 0; c != optstr[i]; i++)
385		    if (i == NOPT - 1)
386			return -1;
387		opts ^= 1 << flags[i];
388	    }
389	    if (opts & 1 << RBX_PROBEKBD) {
390		i = *(uint8_t *)PTOV(0x496) & 0x10;
391		/* printf("Keyboard: %s\n", i ? "yes" : "no"); */
392		if (!i)
393		    opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL;
394		opts &= ~(1 << RBX_PROBEKBD);
395	    }
396	    ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) :
397		     opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD;
398	    if (ioctrl & IO_SERIAL)
399	        sio_init();
400	} else {
401	    for (q = arg--; *q && *q != '('; q++);
402	    if (*q) {
403		drv = -1;
404		if (arg[1] == ':') {
405		    drv = *arg - '0';
406		    if (drv > 9)
407			return (-1);
408		    arg += 2;
409		}
410		if (q - arg != 2)
411		    return -1;
412		for (i = 0; arg[0] != dev_nm[i][0] ||
413			    arg[1] != dev_nm[i][1]; i++)
414		    if (i == NDEV - 1)
415			return -1;
416		dsk.type = i;
417		arg += 3;
418		dsk.unit = *arg - '0';
419		if (arg[1] != ',' || dsk.unit > 9)
420		    return -1;
421		arg += 2;
422		dsk.slice = WHOLE_DISK_SLICE;
423		if (arg[1] == ',') {
424		    dsk.slice = *arg - '0' + 1;
425		    if (dsk.slice > NDOSPART)
426			return -1;
427		    arg += 2;
428		}
429		if (arg[1] != ')')
430		    return -1;
431		dsk.part = *arg - 'a';
432		if (dsk.part > 7)
433		    return (-1);
434		arg += 2;
435		if (drv == -1)
436		    drv = dsk.unit;
437		dsk.drive = (dsk.type <= TYPE_MAXHARD
438			     ? DRV_HARD : 0) + drv;
439		dsk_meta = 0;
440	    }
441	    if ((i = p - arg - !*(p - 1))) {
442		if ((size_t)i >= sizeof(kname))
443		    return -1;
444		memcpy(kname, arg, i + 1);
445	    }
446	}
447	arg = p;
448    }
449    return 0;
450}
451
452static int
453dskread(void *buf, unsigned lba, unsigned nblk)
454{
455    struct dos_partition *dp;
456    struct disklabel *d;
457    char *sec;
458    unsigned sl, i;
459
460    if (!dsk_meta) {
461	sec = dmadat->secbuf;
462	dsk.start = 0;
463	if (drvread(sec, DOSBBSECTOR, 1))
464	    return -1;
465	dp = (void *)(sec + DOSPARTOFF);
466	sl = dsk.slice;
467	if (sl < BASE_SLICE) {
468	    for (i = 0; i < NDOSPART; i++)
469		if (dp[i].dp_typ == DOSPTYP_386BSD &&
470		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
471		    sl = BASE_SLICE + i;
472		    if (dp[i].dp_flag & 0x80 ||
473			dsk.slice == COMPATIBILITY_SLICE)
474			break;
475		}
476	    if (dsk.slice == WHOLE_DISK_SLICE)
477		dsk.slice = sl;
478	}
479	if (sl != WHOLE_DISK_SLICE) {
480	    if (sl != COMPATIBILITY_SLICE)
481		dp += sl - BASE_SLICE;
482	    if (dp->dp_typ != DOSPTYP_386BSD) {
483		printf("Invalid %s\n", "slice");
484		return -1;
485	    }
486	    dsk.start = dp->dp_start;
487	}
488	if (drvread(sec, dsk.start + LABELSECTOR, 1))
489		return -1;
490	d = (void *)(sec + LABELOFFSET);
491	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
492	    if (dsk.part != RAW_PART) {
493		printf("Invalid %s\n", "label");
494		return -1;
495	    }
496	} else {
497	    if (!dsk.init) {
498		if (d->d_type == DTYPE_SCSI)
499		    dsk.type = TYPE_DA;
500		dsk.init++;
501	    }
502	    if (dsk.part >= d->d_npartitions ||
503		!d->d_partitions[dsk.part].p_size) {
504		printf("Invalid %s\n", "partition");
505		return -1;
506	    }
507	    dsk.start += d->d_partitions[dsk.part].p_offset;
508	    dsk.start -= d->d_partitions[RAW_PART].p_offset;
509	}
510    }
511    return drvread(buf, dsk.start + lba, nblk);
512}
513
514static void
515printf(const char *fmt,...)
516{
517    va_list ap;
518    char buf[10];
519    char *s;
520    unsigned u;
521    int c;
522
523    va_start(ap, fmt);
524    while ((c = *fmt++)) {
525	if (c == '%') {
526	    c = *fmt++;
527	    switch (c) {
528	    case 'c':
529		putchar(va_arg(ap, int));
530		continue;
531	    case 's':
532		for (s = va_arg(ap, char *); *s; s++)
533		    putchar(*s);
534		continue;
535	    case 'u':
536		u = va_arg(ap, unsigned);
537		s = buf;
538		do
539		    *s++ = '0' + u % 10U;
540		while (u /= 10U);
541		while (--s >= buf)
542		    putchar(*s);
543		continue;
544	    }
545	}
546	putchar(c);
547    }
548    va_end(ap);
549    return;
550}
551
552static void
553putchar(int c)
554{
555    if (c == '\n')
556	xputc('\r');
557    xputc(c);
558}
559
560static int
561drvread(void *buf, unsigned lba, unsigned nblk)
562{
563    static unsigned c = 0x2d5c7c2f;
564
565    printf("%c\b", c = c << 8 | c >> 24);
566    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
567    v86.addr = XREADORG;		/* call to xread in boot1 */
568    v86.es = VTOPSEG(buf);
569    v86.eax = lba;
570    v86.ebx = VTOPOFF(buf);
571    v86.ecx = lba >> 16;
572    v86.edx = nblk << 8 | dsk.drive;
573    v86int();
574    v86.ctl = V86_FLAGS;
575    if (V86_CY(v86.efl)) {
576	printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
577	return -1;
578    }
579    return 0;
580}
581
582static int
583keyhit(unsigned ticks)
584{
585    uint32_t t0, t1;
586
587    if (opts & 1 << RBX_NOINTR)
588	return 0;
589    t0 = 0;
590    for (;;) {
591	if (xgetc(1))
592	    return 1;
593	t1 = *(uint32_t *)PTOV(0x46c);
594	if (!t0)
595	    t0 = t1;
596	if (t1 < t0 || t1 >= t0 + ticks)
597	    return 0;
598    }
599}
600
601static int
602xputc(int c)
603{
604    if (ioctrl & IO_KEYBOARD)
605	putc(c);
606    if (ioctrl & IO_SERIAL)
607	sio_putc(c);
608    return c;
609}
610
611static int
612xgetc(int fn)
613{
614    if (opts & 1 << RBX_NOINTR)
615	return 0;
616    for (;;) {
617	if (ioctrl & IO_KEYBOARD && getc(1))
618	    return fn ? 1 : getc(0);
619	if (ioctrl & IO_SERIAL && sio_ischar())
620	    return fn ? 1 : sio_getc();
621	if (fn)
622	    return 0;
623    }
624}
625
626static int
627getc(int fn)
628{
629    v86.addr = 0x16;
630    v86.eax = fn << 8;
631    v86int();
632    return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
633}
634