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#include <sys/cdefs.h>
17__FBSDID("$FreeBSD$");
18
19#include <sys/param.h>
20#include <sys/disklabel.h>
21#include <sys/diskmbr.h>
22#include <sys/dirent.h>
23#include <sys/reboot.h>
24
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#include "paths.h"
37#include "rbx.h"
38
39/* Define to 0 to omit serial support */
40#ifndef SERIAL
41#define SERIAL 1
42#endif
43
44#define IO_KEYBOARD	1
45#define IO_SERIAL	2
46
47#if SERIAL
48#define DO_KBD (ioctrl & IO_KEYBOARD)
49#define DO_SIO (ioctrl & IO_SERIAL)
50#else
51#define DO_KBD (1)
52#define DO_SIO (0)
53#endif
54
55#define SECOND		18	/* Circa that many ticks in a second. */
56
57#define ARGS		0x900
58#define NOPT		14
59#define NDEV		3
60#define MEM_BASE	0x12
61#define MEM_EXT 	0x15
62
63#define DRV_HARD	0x80
64#define DRV_MASK	0x7f
65
66#define TYPE_AD		0
67#define TYPE_DA		1
68#define TYPE_MAXHARD	TYPE_DA
69#define TYPE_FD		2
70
71extern uint32_t _end;
72
73static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
74static const unsigned char flags[NOPT] = {
75    RBX_DUAL,
76    RBX_SERIAL,
77    RBX_ASKNAME,
78    RBX_CDROM,
79    RBX_CONFIG,
80    RBX_KDB,
81    RBX_GDB,
82    RBX_MUTE,
83    RBX_NOINTR,
84    RBX_PAUSE,
85    RBX_QUIET,
86    RBX_DFLTROOT,
87    RBX_SINGLE,
88    RBX_VERBOSE
89};
90
91static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
92static const unsigned char dev_maj[NDEV] = {30, 4, 2};
93
94static struct dsk {
95    unsigned drive;
96    unsigned type;
97    unsigned unit;
98    uint8_t slice;
99    uint8_t part;
100    unsigned start;
101    int init;
102} dsk;
103static char cmd[512], cmddup[512], knamebuf[1024];
104static const char *kname;
105uint32_t opts;
106static struct bootinfo bootinfo;
107#if SERIAL
108static int comspeed = SIOSPD;
109static uint8_t ioctrl = IO_KEYBOARD;
110#endif
111
112void exit(int);
113static void load(void);
114static int parse(void);
115static int dskread(void *, unsigned, unsigned);
116static void printf(const char *,...);
117static void putchar(int);
118static int drvread(void *, unsigned, unsigned);
119static int keyhit(unsigned);
120static int xputc(int);
121static int xgetc(int);
122static inline int getc(int);
123
124static void memcpy(void *, const void *, int);
125static void
126memcpy(void *dst, const void *src, int len)
127{
128    const char *s = src;
129    char *d = dst;
130
131    while (len--)
132        *d++ = *s++;
133}
134
135static inline int
136strcmp(const char *s1, const char *s2)
137{
138    for (; *s1 == *s2 && *s1; s1++, s2++);
139    return (unsigned char)*s1 - (unsigned char)*s2;
140}
141
142#define	UFS_SMALL_CGBASE
143#include "ufsread.c"
144
145static inline int
146xfsread(ufs_ino_t inode, void *buf, size_t nbyte)
147{
148    if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
149	printf("Invalid %s\n", "format");
150	return -1;
151    }
152    return 0;
153}
154
155static inline void
156getstr(void)
157{
158    char *s;
159    int c;
160
161    s = cmd;
162    for (;;) {
163	switch (c = xgetc(0)) {
164	case 0:
165	    break;
166	case '\177':
167	case '\b':
168	    if (s > cmd) {
169		s--;
170		printf("\b \b");
171	    }
172	    break;
173	case '\n':
174	case '\r':
175	    *s = 0;
176	    return;
177	default:
178	    if (s - cmd < sizeof(cmd) - 1)
179		*s++ = c;
180	    putchar(c);
181	}
182    }
183}
184
185static inline void
186putc(int c)
187{
188    v86.addr = 0x10;
189    v86.eax = 0xe00 | (c & 0xff);
190    v86.ebx = 0x7;
191    v86int();
192}
193
194int
195main(void)
196{
197    uint8_t autoboot;
198    ufs_ino_t ino;
199    size_t nbyte;
200
201    dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
202    v86.ctl = V86_FLAGS;
203    v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
204    dsk.drive = *(uint8_t *)PTOV(ARGS);
205    dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
206    dsk.unit = dsk.drive & DRV_MASK;
207    dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1;
208    bootinfo.bi_version = BOOTINFO_VERSION;
209    bootinfo.bi_size = sizeof(bootinfo);
210
211    /* Process configuration file */
212
213    autoboot = 1;
214
215    if ((ino = lookup(PATH_CONFIG)) ||
216        (ino = lookup(PATH_DOTCONFIG))) {
217	nbyte = fsread(ino, cmd, sizeof(cmd) - 1);
218	cmd[nbyte] = '\0';
219    }
220
221    if (*cmd) {
222	memcpy(cmddup, cmd, sizeof(cmd));
223	if (parse())
224	    autoboot = 0;
225	if (!OPT_CHECK(RBX_QUIET))
226	    printf("%s: %s", PATH_CONFIG, cmddup);
227	/* Do not process this command twice */
228	*cmd = 0;
229    }
230
231    /*
232     * Try to exec stage 3 boot loader. If interrupted by a keypress,
233     * or in case of failure, try to load a kernel directly instead.
234     */
235
236    if (!kname) {
237	kname = PATH_LOADER;
238	if (autoboot && !keyhit(3*SECOND)) {
239	    load();
240	    kname = PATH_KERNEL;
241	}
242    }
243
244    /* Present the user with the boot2 prompt. */
245
246    for (;;) {
247	if (!autoboot || !OPT_CHECK(RBX_QUIET))
248	    printf("\nFreeBSD/x86 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 (DO_SIO)
254	    sio_flush();
255	if (!autoboot || keyhit(3*SECOND))
256	    getstr();
257	else if (!autoboot || !OPT_CHECK(RBX_QUIET))
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    static Elf32_Phdr ep[2];
281    static Elf32_Shdr es[2];
282    caddr_t p;
283    ufs_ino_t ino;
284    uint32_t addr;
285    int 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
295    if (N_GETMAGIC(hdr.ex) == ZMAGIC) {
296	addr = hdr.ex.a_entry & 0xffffff;
297	p = PTOV(addr);
298	fs_off = PAGE_SIZE;
299	if (xfsread(ino, p, hdr.ex.a_text))
300	    return;
301	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
302	if (xfsread(ino, p, hdr.ex.a_data))
303	    return;
304    } else if (IS_ELF(hdr.eh)) {
305	fs_off = hdr.eh.e_phoff;
306	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
307	    if (xfsread(ino, ep + j, sizeof(ep[0])))
308		return;
309	    if (ep[j].p_type == PT_LOAD)
310		j++;
311	}
312	for (i = 0; i < 2; i++) {
313	    p = PTOV(ep[i].p_paddr & 0xffffff);
314	    fs_off = ep[i].p_offset;
315	    if (xfsread(ino, p, ep[i].p_filesz))
316		return;
317	}
318	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
319	bootinfo.bi_symtab = VTOP(p);
320	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
321	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
322		(hdr.eh.e_shstrndx + 1);
323	    if (xfsread(ino, &es, sizeof(es)))
324		return;
325	    for (i = 0; i < 2; i++) {
326		*(Elf32_Word *)p = es[i].sh_size;
327		p += sizeof(es[i].sh_size);
328		fs_off = es[i].sh_offset;
329		if (xfsread(ino, p, es[i].sh_size))
330		    return;
331		p += es[i].sh_size;
332	    }
333	}
334	addr = hdr.eh.e_entry & 0xffffff;
335	bootinfo.bi_esymtab = VTOP(p);
336    } else {
337	printf("Invalid %s\n", "format");
338	return;
339    }
340
341    bootinfo.bi_kernelname = VTOP(kname);
342    bootinfo.bi_bios_dev = dsk.drive;
343    __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
344	   MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part),
345	   0, 0, 0, VTOP(&bootinfo));
346}
347
348static int
349parse()
350{
351    char *arg = cmd;
352    char *ep, *p, *q;
353    const char *cp;
354    unsigned int drv;
355    int c, i, j;
356
357    while ((c = *arg++)) {
358	if (c == ' ' || c == '\t' || c == '\n')
359	    continue;
360	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
361	ep = p;
362	if (*p)
363	    *p++ = 0;
364	if (c == '-') {
365	    while ((c = *arg++)) {
366		if (c == 'P') {
367		    if (*(uint8_t *)PTOV(0x496) & 0x10) {
368			cp = "yes";
369		    } else {
370			opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
371			cp = "no";
372		    }
373		    printf("Keyboard: %s\n", cp);
374		    continue;
375#if SERIAL
376		} else if (c == 'S') {
377		    j = 0;
378		    while ((unsigned int)(i = *arg++ - '0') <= 9)
379			j = j * 10 + i;
380		    if (j > 0 && i == -'0') {
381			comspeed = j;
382			break;
383		    }
384		    /* Fall through to error below ('S' not in optstr[]). */
385#endif
386		}
387		for (i = 0; c != optstr[i]; i++)
388		    if (i == NOPT - 1)
389			return -1;
390		opts ^= OPT_SET(flags[i]);
391	    }
392#if SERIAL
393	    ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
394		     OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
395	    if (DO_SIO) {
396	        if (sio_init(115200 / comspeed) != 0)
397		    ioctrl &= ~IO_SERIAL;
398	    }
399#endif
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 + 1)
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 = ep - arg)) {
442		if ((size_t)i >= sizeof(knamebuf))
443		    return -1;
444		memcpy(knamebuf, arg, i + 1);
445		kname = knamebuf;
446	    }
447	}
448	arg = p;
449    }
450    return 0;
451}
452
453static int
454dskread(void *buf, unsigned lba, unsigned nblk)
455{
456    struct dos_partition *dp;
457    struct disklabel *d;
458    char *sec;
459    unsigned i;
460    uint8_t sl;
461
462    if (!dsk_meta) {
463	sec = dmadat->secbuf;
464	dsk.start = 0;
465	if (drvread(sec, DOSBBSECTOR, 1))
466	    return -1;
467	dp = (void *)(sec + DOSPARTOFF);
468	sl = dsk.slice;
469	if (sl < BASE_SLICE) {
470	    for (i = 0; i < NDOSPART; i++)
471		if (dp[i].dp_typ == DOSPTYP_386BSD &&
472		    (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
473		    sl = BASE_SLICE + i;
474		    if (dp[i].dp_flag & 0x80 ||
475			dsk.slice == COMPATIBILITY_SLICE)
476			break;
477		}
478	    if (dsk.slice == WHOLE_DISK_SLICE)
479		dsk.slice = sl;
480	}
481	if (sl != WHOLE_DISK_SLICE) {
482	    if (sl != COMPATIBILITY_SLICE)
483		dp += sl - BASE_SLICE;
484	    if (dp->dp_typ != DOSPTYP_386BSD) {
485		printf("Invalid %s\n", "slice");
486		return -1;
487	    }
488	    dsk.start = dp->dp_start;
489	}
490	if (drvread(sec, dsk.start + LABELSECTOR, 1))
491		return -1;
492	d = (void *)(sec + LABELOFFSET);
493	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
494	    if (dsk.part != RAW_PART) {
495		printf("Invalid %s\n", "label");
496		return -1;
497	    }
498	} else {
499	    if (!dsk.init) {
500		if (d->d_type == DTYPE_SCSI)
501		    dsk.type = TYPE_DA;
502		dsk.init++;
503	    }
504	    if (dsk.part >= d->d_npartitions ||
505		!d->d_partitions[dsk.part].p_size) {
506		printf("Invalid %s\n", "partition");
507		return -1;
508	    }
509	    dsk.start += d->d_partitions[dsk.part].p_offset;
510	    dsk.start -= d->d_partitions[RAW_PART].p_offset;
511	}
512    }
513    return drvread(buf, dsk.start + lba, nblk);
514}
515
516static void
517printf(const char *fmt,...)
518{
519    va_list ap;
520    static char buf[10];
521    char *s;
522    unsigned u;
523    int c;
524
525    va_start(ap, fmt);
526    while ((c = *fmt++)) {
527	if (c == '%') {
528	    c = *fmt++;
529	    switch (c) {
530	    case 'c':
531		putchar(va_arg(ap, int));
532		continue;
533	    case 's':
534		for (s = va_arg(ap, char *); *s; s++)
535		    putchar(*s);
536		continue;
537	    case 'u':
538		u = va_arg(ap, unsigned);
539		s = buf;
540		do
541		    *s++ = '0' + u % 10U;
542		while (u /= 10U);
543		while (--s >= buf)
544		    putchar(*s);
545		continue;
546	    }
547	}
548	putchar(c);
549    }
550    va_end(ap);
551    return;
552}
553
554static void
555putchar(int c)
556{
557    if (c == '\n')
558	xputc('\r');
559    xputc(c);
560}
561
562static int
563drvread(void *buf, unsigned lba, unsigned nblk)
564{
565    static unsigned c = 0x2d5c7c2f;
566
567    if (!OPT_CHECK(RBX_QUIET))
568	printf("%c\b", c = c << 8 | c >> 24);
569    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
570    v86.addr = XREADORG;		/* call to xread in boot1 */
571    v86.es = VTOPSEG(buf);
572    v86.eax = lba;
573    v86.ebx = VTOPOFF(buf);
574    v86.ecx = lba >> 16;
575    v86.edx = nblk << 8 | dsk.drive;
576    v86int();
577    v86.ctl = V86_FLAGS;
578    if (V86_CY(v86.efl)) {
579	printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
580	return -1;
581    }
582    return 0;
583}
584
585static int
586keyhit(unsigned ticks)
587{
588    uint32_t t0, t1;
589
590    if (OPT_CHECK(RBX_NOINTR))
591	return 0;
592    t0 = 0;
593    for (;;) {
594	if (xgetc(1))
595	    return 1;
596	t1 = *(uint32_t *)PTOV(0x46c);
597	if (!t0)
598	    t0 = t1;
599	if ((uint32_t)(t1 - t0) >= ticks)
600	    return 0;
601    }
602}
603
604static int
605xputc(int c)
606{
607    if (DO_KBD)
608	putc(c);
609    if (DO_SIO)
610	sio_putc(c);
611    return c;
612}
613
614static int
615getc(int fn)
616{
617    v86.addr = 0x16;
618    v86.eax = fn << 8;
619    v86int();
620    return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);
621}
622
623static int
624xgetc(int fn)
625{
626    if (OPT_CHECK(RBX_NOINTR))
627	return 0;
628    for (;;) {
629	if (DO_KBD && getc(1))
630	    return fn ? 1 : getc(0);
631	if (DO_SIO && sio_ischar())
632	    return fn ? 1 : sio_getc();
633	if (fn)
634	    return 0;
635    }
636}
637