1/*-
2 * Copyright (c) 2008-2009 TAKAHASHI Yoshihiro
3 * Copyright (c) 1998 Robert Nordier
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms are freely
7 * permitted provided that the above copyright notice and this
8 * paragraph and the following disclaimer are duplicated in all
9 * such forms.
10 *
11 * This software is provided "AS IS" and without any express or
12 * implied warranties, including, without limitation, the implied
13 * warranties of merchantability and fitness for a particular
14 * purpose.
15 */
16
17#include <sys/cdefs.h>
18__FBSDID("$FreeBSD$");
19
20#include <sys/param.h>
21#include <sys/disklabel.h>
22#include <sys/diskpc98.h>
23#include <sys/dirent.h>
24#include <sys/reboot.h>
25
26#include <machine/bootinfo.h>
27#include <machine/cpufunc.h>
28#include <machine/elf.h>
29
30#include <stdarg.h>
31
32#include <a.out.h>
33
34#include <btxv86.h>
35
36#include "boot2.h"
37#include "lib.h"
38#include "paths.h"
39#include "rbx.h"
40
41/* Define to 0 to omit serial support */
42#ifndef SERIAL
43#define SERIAL 0
44#endif
45
46#define IO_KEYBOARD	1
47#define IO_SERIAL	2
48
49#if SERIAL
50#define DO_KBD (ioctrl & IO_KEYBOARD)
51#define DO_SIO (ioctrl & IO_SERIAL)
52#else
53#define DO_KBD (1)
54#define DO_SIO (0)
55#endif
56
57#define SECOND		1	/* Circa that many ticks in a second. */
58
59#define ARGS		0x900
60#define NOPT		14
61#define NDEV		3
62
63#define DRV_DISK	0xf0
64#define DRV_UNIT	0x0f
65
66#define TYPE_AD		0
67#define TYPE_DA		1
68#define TYPE_FD		2
69
70extern uint32_t _end;
71
72static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
73static const unsigned char flags[NOPT] = {
74    RBX_DUAL,
75    RBX_SERIAL,
76    RBX_ASKNAME,
77    RBX_CDROM,
78    RBX_CONFIG,
79    RBX_KDB,
80    RBX_GDB,
81    RBX_MUTE,
82    RBX_NOINTR,
83    RBX_PAUSE,
84    RBX_QUIET,
85    RBX_DFLTROOT,
86    RBX_SINGLE,
87    RBX_VERBOSE
88};
89
90static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
91static const unsigned char dev_maj[NDEV] = {30, 4, 2};
92static const unsigned char dev_daua[NDEV] = {0x80, 0xa0, 0x90};
93
94static struct dsk {
95    unsigned daua;
96    unsigned type;
97    unsigned disk;
98    unsigned unit;
99    unsigned head;
100    unsigned sec;
101    uint8_t slice;
102    uint8_t part;
103    unsigned start;
104} dsk;
105static char cmd[512], cmddup[512], knamebuf[1024];
106static const char *kname;
107uint32_t opts;
108static struct bootinfo bootinfo;
109#if SERIAL
110static int comspeed = SIOSPD;
111static uint8_t ioctrl = IO_KEYBOARD;
112#endif
113
114void exit(int);
115static void load(void);
116static int parse(void);
117static int dskread(void *, unsigned, unsigned);
118static void printf(const char *,...);
119static void putchar(int);
120static int drvread(void *, unsigned);
121static int keyhit(unsigned);
122static int xputc(int);
123static int xgetc(int);
124static inline int getc(int);
125
126static void memcpy(void *, const void *, int);
127static void
128memcpy(void *dst, const void *src, int len)
129{
130    const char *s = src;
131    char *d = dst;
132
133    while (len--)
134        *d++ = *s++;
135}
136
137static inline int
138strcmp(const char *s1, const char *s2)
139{
140    for (; *s1 == *s2 && *s1; s1++, s2++);
141    return (unsigned char)*s1 - (unsigned char)*s2;
142}
143
144#define	UFS_SMALL_CGBASE
145#include "ufsread.c"
146
147static inline int
148xfsread(ufs_ino_t inode, void *buf, size_t nbyte)
149{
150    if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
151	printf("Invalid %s\n", "format");
152	return -1;
153    }
154    return 0;
155}
156
157static inline void
158getstr(void)
159{
160    char *s;
161    int c;
162
163    s = cmd;
164    for (;;) {
165	switch (c = xgetc(0)) {
166	case 0:
167	    break;
168	case '\177':
169	case '\b':
170	    if (s > cmd) {
171		s--;
172		printf("\b \b");
173	    }
174	    break;
175	case '\n':
176	case '\r':
177	    *s = 0;
178	    return;
179	default:
180	    if (s - cmd < sizeof(cmd) - 1)
181		*s++ = c;
182	    putchar(c);
183	}
184    }
185}
186
187static inline void
188putc(int c)
189{
190
191    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
192    v86.addr = PUTCORG;		/* call to putc in boot1 */
193    v86.eax = c;
194    v86int();
195    v86.ctl = V86_FLAGS;
196}
197
198static inline int
199is_scsi_hd(void)
200{
201
202    if ((*(u_char *)PTOV(0x482) >> dsk.unit) & 0x01)
203	return 1;
204
205    return 0;
206}
207
208static inline void
209fix_sector_size(void)
210{
211    u_char *p;
212
213    p = (u_char *)PTOV(0x460 + dsk.unit * 4);	/* SCSI equipment parameter */
214
215    if ((p[0] & 0x1f) == 7) {		/* SCSI MO */
216	if (!(p[3] & 0x30)) {		/* 256B / sector */
217	    p[3] |= 0x10;		/* forced set 512B / sector */
218	    p[3 + 0xa1000] |= 0x10;
219	}
220    }
221}
222
223static inline uint32_t
224get_diskinfo(void)
225{
226
227    if (dsk.disk == 0x30) {				/* 1440KB FD */
228	/* 80 cylinders, 2 heads, 18 sectors */
229	return (80 << 16) | (2 << 8) | 18;
230    } else if (dsk.disk == 0x90) {			/* 1200KB FD */
231	/* 80 cylinders, 2 heads, 15 sectors */
232	return (80 << 16) | (2 << 8) | 15;
233    } else if (dsk.disk == 0x80 || is_scsi_hd()) {	/* IDE or SCSI HDD */
234	v86.addr = 0x1b;
235	v86.eax = 0x8400 | dsk.daua;
236	v86int();
237	return (v86.ecx << 16) | v86.edx;
238    }
239
240    /* SCSI MO or CD */
241    fix_sector_size();	/* SCSI MO */
242
243    /* other SCSI devices */
244    return (65535 << 16) | (8 << 8) | 32;
245}
246
247static void
248set_dsk(void)
249{
250    uint32_t di;
251
252    di = get_diskinfo();
253
254    dsk.head = (di >> 8) & 0xff;
255    dsk.sec = di & 0xff;
256    dsk.start = 0;
257}
258
259#ifdef GET_BIOSGEOM
260static uint32_t
261bd_getbigeom(int bunit)
262{
263    int hds = 0;
264    int unit = 0x80;		/* IDE HDD */
265    u_int addr = 0x55d;
266
267    while (unit < 0xa7) {
268	if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f)))
269	    if (hds++ == bunit)
270		break;
271
272	if (unit >= 0xA0) {
273	    int media = ((unsigned *)PTOV(0x460))[unit & 0x0F] & 0x1F;
274
275	    if (media == 7 && hds++ == bunit)	/* SCSI MO */
276		return(0xFFFE0820); /* C:65535 H:8 S:32 */
277	}
278	if (++unit == 0x84) {
279	    unit = 0xA0;	/* SCSI HDD */
280	    addr = 0x482;
281	}
282    }
283    if (unit == 0xa7)
284	return 0x4F020F;	/* 1200KB FD C:80 H:2 S:15 */
285    v86.addr = 0x1b;
286    v86.eax = 0x8400 | unit;
287    v86int();
288    if (V86_CY(v86.efl))
289	return 0x4F020F;	/* 1200KB FD C:80 H:2 S:15 */
290    return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff);
291}
292#endif
293
294static int
295check_slice(void)
296{
297    struct pc98_partition *dp;
298    char *sec;
299    unsigned i, cyl;
300
301    sec = dmadat->secbuf;
302    cyl = *(uint16_t *)PTOV(ARGS);
303    set_dsk();
304
305    if (dsk.type == TYPE_FD)
306	return (WHOLE_DISK_SLICE);
307    if (drvread(sec, PC98_BBSECTOR))
308	return (WHOLE_DISK_SLICE);	/* Read error */
309    dp = (void *)(sec + PC98_PARTOFF);
310    for (i = 0; i < PC98_NPARTS; i++) {
311	if (dp[i].dp_mid == DOSMID_386BSD) {
312	    if (dp[i].dp_scyl <= cyl && cyl <= dp[i].dp_ecyl)
313		return (BASE_SLICE + i);
314	}
315    }
316
317    return (WHOLE_DISK_SLICE);
318}
319
320int
321main(void)
322{
323#ifdef GET_BIOSGEOM
324    int i;
325#endif
326    uint8_t autoboot;
327    ufs_ino_t ino;
328    size_t nbyte;
329
330    dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
331    v86.ctl = V86_FLAGS;
332    v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
333    dsk.daua = *(uint8_t *)PTOV(0x584);
334    dsk.disk = dsk.daua & DRV_DISK;
335    dsk.unit = dsk.daua & DRV_UNIT;
336    if (dsk.disk == 0x80)
337        dsk.type = TYPE_AD;
338    else if (dsk.disk == 0xa0)
339        dsk.type = TYPE_DA;
340    else /* if (dsk.disk == 0x30 || dsk.disk == 0x90) */
341        dsk.type = TYPE_FD;
342    dsk.slice = check_slice();
343#ifdef GET_BIOSGEOM
344    for (i = 0; i < N_BIOS_GEOM; i++)
345	bootinfo.bi_bios_geom[i] = bd_getbigeom(i);
346#endif
347    bootinfo.bi_version = BOOTINFO_VERSION;
348    bootinfo.bi_size = sizeof(bootinfo);
349
350    /* Process configuration file */
351
352    autoboot = 1;
353
354    if ((ino = lookup(PATH_CONFIG)) ||
355        (ino = lookup(PATH_DOTCONFIG))) {
356	nbyte = fsread(ino, cmd, sizeof(cmd) - 1);
357	cmd[nbyte] = '\0';
358    }
359
360    if (*cmd) {
361	memcpy(cmddup, cmd, sizeof(cmd));
362	if (parse())
363	    autoboot = 0;
364	if (!OPT_CHECK(RBX_QUIET))
365	    printf("%s: %s", PATH_CONFIG, cmddup);
366	/* Do not process this command twice */
367	*cmd = 0;
368    }
369
370    /*
371     * Try to exec stage 3 boot loader. If interrupted by a keypress,
372     * or in case of failure, try to load a kernel directly instead.
373     */
374
375    if (!kname) {
376	kname = PATH_LOADER;
377	if (autoboot && !keyhit(3*SECOND)) {
378	    load();
379	    kname = PATH_KERNEL;
380	}
381    }
382
383    /* Present the user with the boot2 prompt. */
384
385    for (;;) {
386	if (!autoboot || !OPT_CHECK(RBX_QUIET))
387	    printf("\nFreeBSD/pc98 boot\n"
388		   "Default: %u:%s(%u,%c)%s\n"
389		   "boot: ",
390		   dsk.unit, dev_nm[dsk.type], dsk.unit,
391		   'a' + dsk.part, kname);
392	if (DO_SIO)
393	    sio_flush();
394	if (!autoboot || keyhit(3*SECOND))
395	    getstr();
396	else if (!autoboot || !OPT_CHECK(RBX_QUIET))
397	    putchar('\n');
398	autoboot = 0;
399	if (parse())
400	    putchar('\a');
401	else
402	    load();
403    }
404}
405
406/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
407void
408exit(int x)
409{
410}
411
412static void
413load(void)
414{
415    union {
416	struct exec ex;
417	Elf32_Ehdr eh;
418    } hdr;
419    static Elf32_Phdr ep[2];
420    static Elf32_Shdr es[2];
421    caddr_t p;
422    ufs_ino_t ino;
423    uint32_t addr;
424    int i, j;
425
426    if (!(ino = lookup(kname))) {
427	if (!ls)
428	    printf("No %s\n", kname);
429	return;
430    }
431    if (xfsread(ino, &hdr, sizeof(hdr)))
432	return;
433
434    if (N_GETMAGIC(hdr.ex) == ZMAGIC) {
435	addr = hdr.ex.a_entry & 0xffffff;
436	p = PTOV(addr);
437	fs_off = PAGE_SIZE;
438	if (xfsread(ino, p, hdr.ex.a_text))
439	    return;
440	p += roundup2(hdr.ex.a_text, PAGE_SIZE);
441	if (xfsread(ino, p, hdr.ex.a_data))
442	    return;
443    } else if (IS_ELF(hdr.eh)) {
444	fs_off = hdr.eh.e_phoff;
445	for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
446	    if (xfsread(ino, ep + j, sizeof(ep[0])))
447		return;
448	    if (ep[j].p_type == PT_LOAD)
449		j++;
450	}
451	for (i = 0; i < 2; i++) {
452	    p = PTOV(ep[i].p_paddr & 0xffffff);
453	    fs_off = ep[i].p_offset;
454	    if (xfsread(ino, p, ep[i].p_filesz))
455		return;
456	}
457	p += roundup2(ep[1].p_memsz, PAGE_SIZE);
458	bootinfo.bi_symtab = VTOP(p);
459	if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
460	    fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
461		(hdr.eh.e_shstrndx + 1);
462	    if (xfsread(ino, &es, sizeof(es)))
463		return;
464	    for (i = 0; i < 2; i++) {
465		*(Elf32_Word *)p = es[i].sh_size;
466		p += sizeof(es[i].sh_size);
467		fs_off = es[i].sh_offset;
468		if (xfsread(ino, p, es[i].sh_size))
469		    return;
470		p += es[i].sh_size;
471	    }
472	}
473	addr = hdr.eh.e_entry & 0xffffff;
474	bootinfo.bi_esymtab = VTOP(p);
475    } else {
476	printf("Invalid %s\n", "format");
477	return;
478    }
479
480    bootinfo.bi_kernelname = VTOP(kname);
481    bootinfo.bi_bios_dev = dsk.daua;
482    __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
483	   MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part),
484	   0, 0, 0, VTOP(&bootinfo));
485}
486
487static int
488parse()
489{
490    char *arg = cmd;
491    char *ep, *p, *q;
492    const char *cp;
493    unsigned int drv;
494    int c, i, j;
495
496    while ((c = *arg++)) {
497	if (c == ' ' || c == '\t' || c == '\n')
498	    continue;
499	for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
500	ep = p;
501	if (*p)
502	    *p++ = 0;
503	if (c == '-') {
504	    while ((c = *arg++)) {
505		if (c == 'P') {
506		    if (*(uint8_t *)PTOV(0x481) & 0x48) {
507			cp = "yes";
508		    } else {
509			opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL);
510			cp = "no";
511		    }
512		    printf("Keyboard: %s\n", cp);
513		    continue;
514#if SERIAL
515		} else if (c == 'S') {
516		    j = 0;
517		    while ((unsigned int)(i = *arg++ - '0') <= 9)
518			j = j * 10 + i;
519		    if (j > 0 && i == -'0') {
520			comspeed = j;
521			break;
522		    }
523		    /* Fall through to error below ('S' not in optstr[]). */
524#endif
525		}
526		for (i = 0; c != optstr[i]; i++)
527		    if (i == NOPT - 1)
528			return -1;
529		opts ^= OPT_SET(flags[i]);
530	    }
531#if SERIAL
532	    ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
533		     OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
534	    if (DO_SIO) {
535	        if (sio_init(115200 / comspeed) != 0)
536		    ioctrl &= ~IO_SERIAL;
537	    }
538#endif
539	} else {
540	    for (q = arg--; *q && *q != '('; q++);
541	    if (*q) {
542		drv = -1;
543		if (arg[1] == ':') {
544		    drv = *arg - '0';
545		    if (drv > 9)
546			return (-1);
547		    arg += 2;
548		}
549		if (q - arg != 2)
550		    return -1;
551		for (i = 0; arg[0] != dev_nm[i][0] ||
552			    arg[1] != dev_nm[i][1]; i++)
553		    if (i == NDEV - 1)
554			return -1;
555		dsk.type = i;
556		arg += 3;
557		dsk.unit = *arg - '0';
558		if (arg[1] != ',' || dsk.unit > 9)
559		    return -1;
560		arg += 2;
561		dsk.slice = WHOLE_DISK_SLICE;
562		if (arg[1] == ',') {
563		    dsk.slice = *arg - '0' + 1;
564		    if (dsk.slice > PC98_NPARTS + 1)
565			return -1;
566		    arg += 2;
567		}
568		if (arg[1] != ')')
569		    return -1;
570		dsk.part = *arg - 'a';
571		if (dsk.part > 7)
572		    return (-1);
573		arg += 2;
574		if (drv == -1)
575		    drv = dsk.unit;
576		dsk.disk = dev_daua[dsk.type];
577		dsk.daua = dsk.disk | dsk.unit;
578		dsk_meta = 0;
579	    }
580	    if ((i = ep - arg)) {
581		if ((size_t)i >= sizeof(knamebuf))
582		    return -1;
583		memcpy(knamebuf, arg, i + 1);
584		kname = knamebuf;
585	    }
586	}
587	arg = p;
588    }
589    return 0;
590}
591
592static int
593dskread(void *buf, unsigned lba, unsigned nblk)
594{
595    struct pc98_partition *dp;
596    struct disklabel *d;
597    char *sec;
598    unsigned i;
599    uint8_t sl;
600    u_char *p;
601
602    if (!dsk_meta) {
603	sec = dmadat->secbuf;
604	set_dsk();
605	if (dsk.type == TYPE_FD)
606	    goto unsliced;
607	if (drvread(sec, PC98_BBSECTOR))
608	    return -1;
609	dp = (void *)(sec + PC98_PARTOFF);
610	sl = dsk.slice;
611	if (sl < BASE_SLICE) {
612	    for (i = 0; i < PC98_NPARTS; i++)
613		if (dp[i].dp_mid == DOSMID_386BSD) {
614		    sl = BASE_SLICE + i;
615		    break;
616		}
617	    dsk.slice = sl;
618	}
619	if (sl != WHOLE_DISK_SLICE) {
620	    dp += sl - BASE_SLICE;
621	    if (dp->dp_mid != DOSMID_386BSD) {
622		printf("Invalid %s\n", "slice");
623		return -1;
624	    }
625	    dsk.start = dp->dp_scyl * dsk.head * dsk.sec +
626		dp->dp_shd * dsk.sec + dp->dp_ssect;
627	}
628	if (drvread(sec, dsk.start + LABELSECTOR))
629		return -1;
630	d = (void *)(sec + LABELOFFSET);
631	if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) {
632	    if (dsk.part != RAW_PART) {
633		printf("Invalid %s\n", "label");
634		return -1;
635	    }
636	} else {
637	    if (dsk.part >= d->d_npartitions ||
638		!d->d_partitions[dsk.part].p_size) {
639		printf("Invalid %s\n", "partition");
640		return -1;
641	    }
642	    dsk.start += d->d_partitions[dsk.part].p_offset;
643	    dsk.start -= d->d_partitions[RAW_PART].p_offset;
644	}
645    unsliced: ;
646    }
647    for (p = buf; nblk; p += 512, lba++, nblk--) {
648	if ((i = drvread(p, dsk.start + lba)))
649	    return i;
650    }
651    return 0;
652}
653
654static void
655printf(const char *fmt,...)
656{
657    va_list ap;
658    static char buf[10];
659    char *s;
660    unsigned u;
661    int c;
662
663    va_start(ap, fmt);
664    while ((c = *fmt++)) {
665	if (c == '%') {
666	    c = *fmt++;
667	    switch (c) {
668	    case 'c':
669		putchar(va_arg(ap, int));
670		continue;
671	    case 's':
672		for (s = va_arg(ap, char *); *s; s++)
673		    putchar(*s);
674		continue;
675	    case 'u':
676		u = va_arg(ap, unsigned);
677		s = buf;
678		do
679		    *s++ = '0' + u % 10U;
680		while (u /= 10U);
681		while (--s >= buf)
682		    putchar(*s);
683		continue;
684	    }
685	}
686	putchar(c);
687    }
688    va_end(ap);
689    return;
690}
691
692static void
693putchar(int c)
694{
695    if (c == '\n')
696	xputc('\r');
697    xputc(c);
698}
699
700static int
701drvread(void *buf, unsigned lba)
702{
703    static unsigned c = 0x2d5c7c2f;
704    unsigned bpc, x, cyl, head, sec;
705
706    bpc = dsk.sec * dsk.head;
707    cyl = lba / bpc;
708    x = lba % bpc;
709    head = x / dsk.sec;
710    sec = x % dsk.sec;
711
712    if (!OPT_CHECK(RBX_QUIET))
713	printf("%c\b", c = c << 8 | c >> 24);
714    v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
715    v86.addr = READORG;		/* call to read in boot1 */
716    v86.ecx = cyl;
717    v86.edx = (head << 8) | sec;
718    v86.edi = lba;
719    v86.ebx = 512;
720    v86.es = VTOPSEG(buf);
721    v86.ebp = VTOPOFF(buf);
722    v86int();
723    v86.ctl = V86_FLAGS;
724    if (V86_CY(v86.efl)) {
725	printf("error %u c/h/s %u/%u/%u lba %u\n", v86.eax >> 8 & 0xff,
726	       cyl, head, sec, lba);
727	return -1;
728    }
729    return 0;
730}
731
732static inline void
733delay(void)
734{
735    int i;
736
737    i = 800;
738    do {
739	outb(0x5f, 0);	/* about 600ns */
740    } while (--i >= 0);
741}
742
743static int
744keyhit(unsigned sec)
745{
746    unsigned i;
747
748    if (OPT_CHECK(RBX_NOINTR))
749	return 0;
750    for (i = 0; i < sec * 1000; i++) {
751	if (xgetc(1))
752	    return 1;
753	delay();
754    }
755    return 0;
756}
757
758static int
759xputc(int c)
760{
761    if (DO_KBD)
762	putc(c);
763    if (DO_SIO)
764	sio_putc(c);
765    return c;
766}
767
768static int
769getc(int fn)
770{
771    v86.addr = 0x18;
772    v86.eax = fn << 8;
773    v86int();
774    if (fn)
775	return (v86.ebx >> 8) & 0x01;
776    else
777	return v86.eax & 0xff;
778}
779
780static int
781xgetc(int fn)
782{
783    if (OPT_CHECK(RBX_NOINTR))
784	return 0;
785    for (;;) {
786	if (DO_KBD && getc(1))
787	    return fn ? 1 : getc(0);
788	if (DO_SIO && sio_ischar())
789	    return fn ? 1 : sio_getc();
790	if (fn)
791	    return 0;
792    }
793}
794