loadbsd.c revision 1.7.16.1 1 /*
2 * Load and boot NetBSD kernel on Human68k
3 *
4 * written by Yasha (ITOH Yasufumi)
5 * public domain
6 *
7 * loadbsd [-hvV] [-abDs] [-r root_device] netbsd
8 *
9 * loadbsd options:
10 * -h help
11 * -V print version and exit
12 *
13 * kernel options:
14 * -a auto boot, opposite of -s
15 * -s single user boot (default)
16 * -D enter kernel debugger
17 * -b ask root device
18 * -r specify root device
19 * -q quiet boot
20 * -v verbose boot (also turn on verbosity of loadbsd)
21 *
22 * $NetBSD: loadbsd.c,v 1.7.16.1 2002/05/30 15:36:42 gehenna Exp $
23 */
24
25 #include <sys/cdefs.h>
26
27 __RCSID("$NetBSD: loadbsd.c,v 1.7.16.1 2002/05/30 15:36:42 gehenna Exp $");
28 #define VERSION "$Revision: 1.7.16.1 $ $Date: 2002/05/30 15:36:42 $"
29
30 #include <sys/types.h> /* ntohl */
31 #include <sys/reboot.h>
32 #include <sys/param.h> /* ALIGN, ALIGNBYTES */
33 #include <a.out.h>
34 #include <sys/exec_elf.h>
35 #include <string.h>
36 #include <machine/bootinfo.h>
37
38 #include <dos.h>
39 #include <iocs.h>
40 #include "../common/xprintf.h"
41 #include "trampoline.h"
42
43 #define DEFAULT_ROOTDEVNAME "sd@0,0:a"
44
45 #define ISDIGIT(c) ((c) >= '0' && (c) <= '9')
46
47 #define GETDECIMAL(var, str) \
48 do { var *= 10; var += *str++ - '0'; } while (ISDIGIT(*str))
49
50 static const char *lookupif __P((const char *name,
51 unsigned *pif, unsigned *punit));
52 static void get_current_scsi_interface __P((unsigned *pif, unsigned *punit));
53 static int bootdev __P((const char *devstr));
54 static struct tramparg *read_kernel __P((const char *fn));
55 static int chkmpu __P((void));
56 static __dead void usage __P((int status, const char *msg))
57 __attribute__((noreturn));
58
59 int main __P((int argc, char *argv[]));
60
61 int opt_v;
62 int opt_N;
63 const char *kernel_fn;
64
65 const struct hatbl {
66 char name[4];
67 unsigned short id;
68 } hatable[] = {
69 X68K_BOOT_SCSIIF_LIST
70 };
71
72 /*
73 * parse interface name
74 * return the next position
75 */
76 static const char *
77 lookupif(name, pif, punit)
78 const char *name;
79 unsigned *pif, *punit;
80 {
81 unsigned u, unit;
82 const char *p;
83
84 for (u = 0; u < sizeof hatable / sizeof hatable[0]; u++) {
85 const char *n;
86
87 for (n = hatable[u].name, p = name; *n && *n == *p; n++, p++)
88 ;
89 if (!*n)
90 goto found;
91 }
92 /* not found */
93 return (char *) 0;
94
95 found:
96 if (*p == '@')
97 p++;
98
99 /* get unit # */
100 if (!ISDIGIT(*p))
101 return (char *) 0;
102
103 unit = 0;
104 GETDECIMAL(unit, p);
105
106 *pif = hatable[u].id;
107 *punit = unit;
108
109 return p;
110 }
111
112 /*
113 * if the SCSI interface is not specified, use the current one
114 */
115 static void
116 get_current_scsi_interface(pif, punit)
117 unsigned *pif, *punit;
118 {
119 unsigned binf;
120 char *bootrom;
121 int bus_err_buf;
122
123 binf = (unsigned) IOCS_BOOTINF();
124 if (binf < 0x00fc0000)
125 return; /* not booted from SCSI */
126
127 bootrom = (char *) (binf & 0x00ffffe0);
128 if (IOCS_B_LPEEK(bootrom + 0x24) == 0x53435349 && /* 'SCSI' */
129 IOCS_B_WPEEK(bootrom + 0x28) == 0x494E) { /* 'IN' */
130 /* spc0 */
131 *pif = X68K_BOOT_SCSIIF_SPC;
132 *punit = 0;
133 } else if (DOS_BUS_ERR(&bus_err_buf, (void *)EXSPC_BDID, 1)) {
134 /* mha0 */
135 *pif = X68K_BOOT_SCSIIF_MHA;
136 *punit = 0;
137 } else {
138 /* spc1 */
139 *pif = X68K_BOOT_SCSIIF_SPC;
140 *punit = 1;
141 }
142 }
143
144 /*
145 * parse device name
146 *
147 * [/<controller>@<unit>/]<device>@<unit>[,<lun>][:<partition>]
148 *
149 * <unit> must be target SCSI ID if <device> is a SCSI device
150 *
151 * full form:
152 * /spc@0/sd@1,2:e
153 *
154 * partial form:
155 * /mha@0/sd@1 = /mha@0/sd@1,0:a
156 * sd@1:e = /current_device/sd@1,0e
157 * sd@1,2:e = /current_device/sd@1,2:e
158 */
159
160 const struct devtbl {
161 char name[3];
162 u_char major;
163 } devtable[] = {
164 X68K_BOOT_DEV_LIST,
165 X68K_BOOT_NETIF_LIST
166 };
167
168 static int
169 bootdev(devstr)
170 const char *devstr;
171 {
172 unsigned u;
173 unsigned major, unit, lun, partition;
174 int dev;
175 const char *s = devstr;
176 unsigned interface = 0, unit_if = 0;
177
178 if (*s == '/') {
179 /*
180 * /<interface>/<device>"
181 * "/spc@1/sd@2,3:e"
182 */
183 while (*++s == '/') /* skip slashes */
184 ;
185 if (!strchr(s, '/'))
186 xerrx(1, "%s: bad format", devstr);
187
188 if (!(s = lookupif(s, &interface, &unit_if)))
189 xerrx(1, "%s: unknown interface", devstr);
190
191 while (*s == '/') /* skip slashes */
192 s++;
193 } else {
194 /* make lint happy */
195 interface = 0;
196 unit_if = 0;
197 }
198
199 /* allow r at the top */
200 if (*s == 'r')
201 s++;
202
203 for (u = 0; u < sizeof devtable / sizeof devtable[0]; u++)
204 if (s[0] == devtable[u].name[0] && s[1] == devtable[u].name[1])
205 goto found;
206
207 /* not found */
208 xerrx(1, "%s: unknown device", devstr);
209
210 found: major = devtable[u].major;
211
212 /*
213 * <type>@unit[,lun][:part]
214 * "sd@1,3:a"
215 */
216
217 /* get device unit # */
218 s += 2;
219 if (*s == '@')
220 s++;
221 if (!*s)
222 xerrx(1, "%s: missing unit number", devstr);
223 if (!ISDIGIT(*s))
224 xerrx(1, "%s: wrong device", devstr);
225
226 unit = 0;
227 GETDECIMAL(unit, s);
228
229 lun = 0;
230 if (*s == ',') {
231 s++;
232 if (!ISDIGIT(*s))
233 xerrx(1, "%s: wrong device", devstr);
234 GETDECIMAL(lun, s);
235 }
236
237 /* get device partition */
238 if (*s == ':')
239 s++;
240 if (!*s)
241 partition = 0; /* no partition letter -- assuming 'a' */
242 else if (!s[1])
243 partition = *s - 'a';
244 else
245 xerrx(1, "%s: wrong partition letter", devstr);
246
247 /*
248 * sanity check
249 */
250 if (unit_if >= 16)
251 xerrx(1, "%s: interface unit # too large", devstr);
252 if (unit >= 16)
253 xerrx(1, "%s: device unit # too large", devstr);
254 if (lun >= 8)
255 xerrx(1, "%s: SCSI LUN >= 8 is not supported yet", devstr);
256 if (partition >= 16)
257 xerrx(1, "%s: unsupported partition", devstr);
258
259 /*
260 * encode device to be passed to kernel
261 */
262 if (X68K_BOOT_DEV_IS_SCSI(major)) {
263 /*
264 * encode SCSI device
265 */
266 if (interface == 0)
267 get_current_scsi_interface(&interface, &unit_if);
268
269 dev = X68K_MAKESCSIBOOTDEV(major, interface, unit_if,
270 unit, lun, partition);
271 } else {
272 /* encode non-SCSI device */
273 dev = X68K_MAKEBOOTDEV(major, unit, partition);
274 }
275
276 if (opt_v)
277 xwarnx("%s: major %u, if %u, un_if %u, unit %u, lun %u, partition %u; bootdev 0x%x",
278 devstr, major, interface, unit_if, unit, lun, partition, dev);
279
280 return dev;
281 }
282
283 #define LOADBSD
284 #include "../common/exec_sub.c"
285
286 /*
287 * read kernel and create trampoline
288 *
289 * |----------------------| <- allocated buf addr
290 * | kernel image |
291 * ~ (exec file contents) ~
292 * | |
293 * |----------------------| <- return value (entry addr of trampoline)
294 * | struct tramparg |
295 * | (trampoline args) |
296 * |----------------------|
297 * | trampoline code |
298 * | (in assembly) |
299 * |----------------------|
300 */
301 static struct tramparg *
302 read_kernel(fn)
303 const char *fn;
304 {
305 int fd;
306 union dos_fcb *fcb;
307 size_t filesize, nread;
308 void *buf;
309 struct tramparg *arg;
310 size_t size_tramp = end_trampoline - trampoline;
311
312 kernel_fn = fn;
313
314 if ((fd = DOS_OPEN(fn, 0x00)) < 0) /* read only */
315 xerr(1, "%s: open", fn);
316
317 if ((int)(fcb = DOS_GET_FCB_ADR(fd)) < 0)
318 xerr(1, "%s: get_fcb_adr", fn);
319
320 /*
321 * XXX FCB is in supervisor area
322 */
323 /*if (fcb->blk.mode != 0)*/
324 if (IOCS_B_BPEEK((char *)fcb + 1) & 0x80)
325 xerrx(1, "%s: Not a regular file", fn);
326
327 /*filesize = fcb->blk.size;*/
328 filesize = IOCS_B_LPEEK(&fcb->blk.size);
329
330 if (filesize < sizeof(Elf32_Ehdr))
331 xerrx(1, "%s: Unknown format", fn);
332
333 /*
334 * read entire file
335 */
336 if ((int)(buf = DOS_MALLOC(filesize + ALIGNBYTES
337 + sizeof(struct tramparg)
338 + size_tramp + SIZE_TMPSTACK)) < 0)
339 xerr(1, "read_kernel");
340
341 if ((nread = DOS_READ(fd, buf, filesize)) != filesize) {
342 if ((int)nread < 0)
343 xerr(1, "%s: read", fn);
344 else
345 xerrx(1, "%s: short read", fn);
346 }
347
348 if (DOS_CLOSE(fd) < 0)
349 xerr(1, "%s: close", fn);
350
351 /*
352 * address for argument for trampoline code
353 */
354 arg = (struct tramparg *) ALIGN((char *) buf + nread);
355
356 if (opt_v)
357 xwarnx("trampoline arg at %p", arg);
358
359 xk_load(&arg->xk, buf, 0 /* XXX load addr should not be fixed */);
360
361 /*
362 * create argument for trampoline code
363 */
364 arg->bsr_inst = TRAMP_BSR + sizeof(struct tramparg) - 2;
365 arg->tmp_stack = (char *) arg + sizeof(struct tramparg)
366 + size_tramp + SIZE_TMPSTACK;
367 arg->mpu_type = IOCS_MPU_STAT() & 0xff;
368
369 arg->xk.d5 = IOCS_BOOTINF(); /* unused for now */
370 #if 0
371 /* filled afterwards */
372 arg->xk.rootdev =
373 arg->xk.boothowto =
374 #endif
375
376 if (opt_v)
377 xwarnx("args: mpu %d, image %p, load 0x%x, entry 0x%x",
378 arg->mpu_type, arg->xk.sec[0].sec_image,
379 arg->xk.load_addr, arg->xk.entry_addr);
380
381 /*
382 * copy trampoline code
383 */
384 if (opt_v)
385 xwarnx("trampoline code at %p (%u bytes)",
386 (char *) arg + sizeof(struct tramparg), size_tramp);
387
388 memcpy((char *) arg + sizeof(struct tramparg), trampoline, size_tramp);
389
390 return arg;
391 }
392
393 /*
394 * MC68000/010 -> return zero
395 * MC68020 and later -> return nonzero
396 */
397 static int
398 chkmpu()
399 {
400 register int ret asm("%d0");
401
402 asm("| %0 <- this must be %%d0\n\
403 moveq #1,%%d0\n\
404 .long 0x103B02FF | foo: moveb %%pc@((foo+1)-foo-2:B,d0:W:2),%%d0\n\
405 | ^ ^\n\
406 | %%d0.b = 0x02 (68000/010)\n\
407 | = 0xff (68020 and later)\n\
408 bmis 1f\n\
409 moveq #0,%%d0 | 68000/010\n\
410 1:" : "=d" (ret));
411
412 return ret;
413 }
414
415 static __dead void
416 usage(status, msg)
417 int status;
418 const char *msg;
419 {
420 extern const char *const __progname;
421
422 if (msg)
423 xwarnx("%s", msg);
424
425 xerrprintf("\
426 %s [-hvV] [-abDs] [-r root_device] netbsd\n\
427 \n\
428 loadbsd options:\n\
429 \t-h help\n\
430 \t-v verbose\n\
431 \t-V print version and exit\n\
432 \n\
433 kernel options:\n\
434 \t-a auto boot, opposite of -s\n\
435 \t-s single user boot (default)\n\
436 \t-D enter kernel debugger\n\
437 \t-b ask root device\n\
438 \t-r specify root device (default %s)\n\
439 \t format: [/interface/]device@unit[,lun][:partition]\n\
440 \t interface: one of spc@0, spc@1, mha@0\n\
441 \t (current boot interface if omitted)\n\
442 \t device: one of fd, sd, cd, md, ne\n\
443 \t unit: device unit number (SCSI ID for SCSI device)\n\
444 \t lun: SCSI LUN # (0 if omitted)\n\
445 \t partition: partition letter ('a' if omitted)\n\
446 ", __progname, DEFAULT_ROOTDEVNAME);
447
448 DOS_EXIT2(status);
449 }
450
451 int
452 main(argc, argv)
453 int argc;
454 char *argv[];
455 {
456 char *rootdevname = 0;
457 int rootdev;
458 u_long boothowto = RB_SINGLE;
459 const char *kernel;
460 char *p, **flg, **arg;
461 struct tramparg *tramp;
462 struct dos_dregs regs; /* unused... */
463 int i;
464
465 /* parse options */
466 for (arg = flg = argv + 1; (p = *flg) && *p == '-'; ) {
467 int c;
468
469 while ((c = *++p))
470 switch (c) {
471 case 'h':
472 usage(0, (char *) 0);
473 /* NOTREACHED */
474 break;
475 case 'N': /* don't actually execute kernel */
476 opt_N = 1;
477 break;
478 case 'v':
479 opt_v = 1;
480 boothowto |= AB_VERBOSE; /* XXX */
481 break;
482 case 'V':
483 xprintf("loadbsd %s\n", VERSION);
484 return 0;
485
486 /*
487 * kernel boot flags
488 */
489 case 'r':
490 if (rootdevname)
491 usage(1, "multiple -r flags");
492 else if (!*++arg)
493 usage(1, "-r requires device name");
494 else
495 rootdevname = *arg;
496 break;
497 case 'b':
498 boothowto |= RB_ASKNAME;
499 break;
500 case 'a':
501 boothowto &= ~RB_SINGLE;
502 break;
503 case 's':
504 boothowto |= RB_SINGLE;
505 break;
506 case 'D':
507 boothowto |= RB_KDB;
508 break;
509 case 'q':
510 boothowto |= AB_QUIET;
511 break;
512
513 default:
514 usage(1, (char *) 0);
515 /* NOTREACHED */
516 break;
517 }
518 flg = ++arg;
519 }
520
521 /* check MPU */
522 if (chkmpu() == 0)
523 xerrx(1, "Can't boot NetBSD on 68000/010");
524
525 argc -= arg - argv;
526 argv = arg;
527
528 if (argc != 1)
529 usage(1, (char *) 0);
530
531 kernel = *argv;
532
533 rootdev = bootdev(rootdevname ? rootdevname : DEFAULT_ROOTDEVNAME);
534
535 if (opt_v)
536 xwarnx("boothowto 0x%x", boothowto);
537
538 tramp = read_kernel(kernel);
539
540 tramp->xk.rootdev = rootdev;
541 tramp->xk.boothowto = boothowto;
542
543 /*
544 * we never return, and make sure the disk cache
545 * be flushed (if write-back cache is enabled)
546 */
547 if (opt_v)
548 xwarnx("flush disk cache...");
549
550 i = DOS_FFLUSH_SET(1); /* enable fflush */
551 DOS_FFLUSH(); /* then, issue fflush */
552 (void) DOS_FFLUSH_SET(i); /* restore old mode just in case */
553
554 /*
555 * the program assumes the MPU caches off
556 */
557 if (opt_v)
558 xwarnx("flush and disable MPU caches...");
559
560 IOCS_CACHE_MD(-1); /* flush */
561 if (!opt_N)
562 IOCS_CACHE_MD(0); /* disable both caches */
563
564 if (opt_v)
565 xwarnx("Jumping to the kernel. Good Luck!");
566
567 if (opt_N)
568 xerrx(0, "But don't actually do it.");
569
570 DOS_SUPER_JSR((void (*) __P((void))) tramp, ®s, ®s);
571
572 /* NOTREACHED */
573
574 xwarnx("??? return from kernel");
575
576 return 1;
577 }
578