loadbsd.c revision 1.11 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 1.11 2009/03/14 15:36:15 dsl Exp $
23 */
24
25 #include <sys/cdefs.h>
26
27 __RCSID("$NetBSD: loadbsd.c,v 1.11 2009/03/14 15:36:15 dsl Exp $");
28 #define VERSION "$Revision: 1.11 $ $Date: 2009/03/14 15:36:15 $"
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(const char *name,
51 unsigned *pif, unsigned *punit);
52 static void get_current_scsi_interface(unsigned *pif, unsigned *punit);
53 static int bootdev(const char *devstr);
54 static struct tramparg *read_kernel(const char *fn);
55 static int chkmpu(void);
56 static __dead void usage(int status, const char *msg)
57 __attribute__((noreturn));
58
59 int main(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(const char *devstr)
170 {
171 unsigned u;
172 unsigned major, unit, lun, partition;
173 int dev;
174 const char *s = devstr;
175 unsigned interface = 0, unit_if = 0;
176
177 if (*s == '/') {
178 /*
179 * /<interface>/<device>"
180 * "/spc@1/sd@2,3:e"
181 */
182 while (*++s == '/') /* skip slashes */
183 ;
184 if (!strchr(s, '/'))
185 xerrx(1, "%s: bad format", devstr);
186
187 if (!(s = lookupif(s, &interface, &unit_if)))
188 xerrx(1, "%s: unknown interface", devstr);
189
190 while (*s == '/') /* skip slashes */
191 s++;
192 } else {
193 /* make lint happy */
194 interface = 0;
195 unit_if = 0;
196 }
197
198 /* allow r at the top */
199 if (*s == 'r')
200 s++;
201
202 for (u = 0; u < sizeof devtable / sizeof devtable[0]; u++)
203 if (s[0] == devtable[u].name[0] && s[1] == devtable[u].name[1])
204 goto found;
205
206 /* not found */
207 xerrx(1, "%s: unknown device", devstr);
208
209 found: major = devtable[u].major;
210
211 /*
212 * <type>@unit[,lun][:part]
213 * "sd@1,3:a"
214 */
215
216 /* get device unit # */
217 s += 2;
218 if (*s == '@')
219 s++;
220 if (!*s)
221 xerrx(1, "%s: missing unit number", devstr);
222 if (!ISDIGIT(*s))
223 xerrx(1, "%s: wrong device", devstr);
224
225 unit = 0;
226 GETDECIMAL(unit, s);
227
228 lun = 0;
229 if (*s == ',') {
230 s++;
231 if (!ISDIGIT(*s))
232 xerrx(1, "%s: wrong device", devstr);
233 GETDECIMAL(lun, s);
234 }
235
236 /* get device partition */
237 if (*s == ':')
238 s++;
239 if (!*s)
240 partition = 0; /* no partition letter -- assuming 'a' */
241 else if (!s[1])
242 partition = *s - 'a';
243 else
244 xerrx(1, "%s: wrong partition letter", devstr);
245
246 /*
247 * sanity check
248 */
249 if (unit_if >= 16)
250 xerrx(1, "%s: interface unit # too large", devstr);
251 if (unit >= 16)
252 xerrx(1, "%s: device unit # too large", devstr);
253 if (lun >= 8)
254 xerrx(1, "%s: SCSI LUN >= 8 is not supported yet", devstr);
255 if (partition >= 16)
256 xerrx(1, "%s: unsupported partition", devstr);
257
258 /*
259 * encode device to be passed to kernel
260 */
261 if (X68K_BOOT_DEV_IS_SCSI(major)) {
262 /*
263 * encode SCSI device
264 */
265 if (interface == 0)
266 get_current_scsi_interface(&interface, &unit_if);
267
268 dev = X68K_MAKESCSIBOOTDEV(major, interface, unit_if,
269 unit, lun, partition);
270 } else {
271 /* encode non-SCSI device */
272 dev = X68K_MAKEBOOTDEV(major, unit, partition);
273 }
274
275 if (opt_v)
276 xwarnx("%s: major %u, if %u, un_if %u, unit %u, lun %u, partition %u; bootdev 0x%x",
277 devstr, major, interface, unit_if, unit, lun, partition, dev);
278
279 return dev;
280 }
281
282 #define LOADBSD
283 #include "../common/exec_sub.c"
284
285 /*
286 * read kernel and create trampoline
287 *
288 * |----------------------| <- allocated buf addr
289 * | kernel image |
290 * ~ (exec file contents) ~
291 * | |
292 * |----------------------| <- return value (entry addr of trampoline)
293 * | struct tramparg |
294 * | (trampoline args) |
295 * |----------------------|
296 * | trampoline code |
297 * | (in assembly) |
298 * |----------------------|
299 */
300 static struct tramparg *
301 read_kernel(const char *fn)
302 {
303 int fd;
304 union dos_fcb *fcb;
305 size_t filesize, nread;
306 void *buf;
307 struct tramparg *arg;
308 size_t size_tramp = end_trampoline - trampoline;
309
310 kernel_fn = fn;
311
312 if ((fd = DOS_OPEN(fn, 0x00)) < 0) /* read only */
313 xerr(1, "%s: open", fn);
314
315 if ((int)(fcb = DOS_GET_FCB_ADR(fd)) < 0)
316 xerr(1, "%s: get_fcb_adr", fn);
317
318 /*
319 * XXX FCB is in supervisor area
320 */
321 /*if (fcb->blk.mode != 0)*/
322 if (IOCS_B_BPEEK((char *)fcb + 1) & 0x80)
323 xerrx(1, "%s: Not a regular file", fn);
324
325 /*filesize = fcb->blk.size;*/
326 filesize = IOCS_B_LPEEK(&fcb->blk.size);
327
328 if (filesize < sizeof(Elf32_Ehdr))
329 xerrx(1, "%s: Unknown format", fn);
330
331 /*
332 * read entire file
333 */
334 if ((int)(buf = DOS_MALLOC(filesize + ALIGNBYTES
335 + sizeof(struct tramparg)
336 + size_tramp + SIZE_TMPSTACK)) < 0)
337 xerr(1, "read_kernel");
338
339 if ((nread = DOS_READ(fd, buf, filesize)) != filesize) {
340 if ((int)nread < 0)
341 xerr(1, "%s: read", fn);
342 else
343 xerrx(1, "%s: short read", fn);
344 }
345
346 if (DOS_CLOSE(fd) < 0)
347 xerr(1, "%s: close", fn);
348
349 /*
350 * address for argument for trampoline code
351 */
352 arg = (struct tramparg *) ALIGN((char *) buf + nread);
353
354 if (opt_v)
355 xwarnx("trampoline arg at %p", arg);
356
357 xk_load(&arg->xk, buf, 0 /* XXX load addr should not be fixed */);
358
359 /*
360 * create argument for trampoline code
361 */
362 arg->bsr_inst = TRAMP_BSR + sizeof(struct tramparg) - 2;
363 arg->tmp_stack = (char *) arg + sizeof(struct tramparg)
364 + size_tramp + SIZE_TMPSTACK;
365 arg->mpu_type = IOCS_MPU_STAT() & 0xff;
366
367 arg->xk.d5 = IOCS_BOOTINF(); /* unused for now */
368 #if 0
369 /* filled afterwards */
370 arg->xk.rootdev =
371 arg->xk.boothowto =
372 #endif
373
374 if (opt_v)
375 xwarnx("args: mpu %d, image %p, load 0x%x, entry 0x%x",
376 arg->mpu_type, arg->xk.sec[0].sec_image,
377 arg->xk.load_addr, arg->xk.entry_addr);
378
379 /*
380 * copy trampoline code
381 */
382 if (opt_v)
383 xwarnx("trampoline code at %p (%u bytes)",
384 (char *) arg + sizeof(struct tramparg), size_tramp);
385
386 memcpy((char *) arg + sizeof(struct tramparg), trampoline, size_tramp);
387
388 return arg;
389 }
390
391 /*
392 * MC68000/010 -> return zero
393 * MC68020 and later -> return nonzero
394 */
395 static int
396 chkmpu()
397 {
398 register int ret __asm("%d0");
399
400 __asm("| %0 <- this must be %%d0\n\
401 moveq #1,%%d0\n\
402 .long 0x103B02FF | foo: moveb %%pc@((foo+1)-foo-2:B,d0:W:2),%%d0\n\
403 | ^ ^\n\
404 | %%d0.b = 0x02 (68000/010)\n\
405 | = 0xff (68020 and later)\n\
406 bmis 1f\n\
407 moveq #0,%%d0 | 68000/010\n\
408 1:" : "=d" (ret));
409
410 return ret;
411 }
412
413 static __dead void
414 usage(int status, const char *msg)
415 {
416 extern const char *const __progname;
417
418 if (msg)
419 xwarnx("%s", msg);
420
421 xerrprintf("\
422 %s [-hvV] [-abDs] [-r root_device] netbsd\n\
423 \n\
424 loadbsd options:\n\
425 \t-h help\n\
426 \t-v verbose\n\
427 \t-V print version and exit\n\
428 \n\
429 kernel options:\n\
430 \t-a auto boot, opposite of -s\n\
431 \t-s single user boot (default)\n\
432 \t-D enter kernel debugger\n\
433 \t-b ask root device\n\
434 \t-r specify root device (default %s)\n\
435 \t format: [/interface/]device@unit[,lun][:partition]\n\
436 \t interface: one of spc@0, spc@1, mha@0\n\
437 \t (current boot interface if omitted)\n\
438 \t device: one of fd, sd, cd, md, ne\n\
439 \t unit: device unit number (SCSI ID for SCSI device)\n\
440 \t lun: SCSI LUN # (0 if omitted)\n\
441 \t partition: partition letter ('a' if omitted)\n\
442 ", __progname, DEFAULT_ROOTDEVNAME);
443
444 DOS_EXIT2(status);
445 }
446
447 int
448 main(argc, argv)
449 int argc;
450 char *argv[];
451 {
452 char *rootdevname = 0;
453 int rootdev;
454 u_long boothowto = RB_SINGLE;
455 const char *kernel;
456 char *p, **flg, **arg;
457 struct tramparg *tramp;
458 struct dos_dregs regs; /* unused... */
459 int i;
460
461 /* parse options */
462 for (arg = flg = argv + 1; (p = *flg) && *p == '-'; ) {
463 int c;
464
465 while ((c = *++p))
466 switch (c) {
467 case 'h':
468 usage(0, (char *) 0);
469 /* NOTREACHED */
470 break;
471 case 'N': /* don't actually execute kernel */
472 opt_N = 1;
473 break;
474 case 'v':
475 opt_v = 1;
476 boothowto |= AB_VERBOSE; /* XXX */
477 break;
478 case 'V':
479 xprintf("loadbsd %s\n", VERSION);
480 return 0;
481
482 /*
483 * kernel boot flags
484 */
485 case 'r':
486 if (rootdevname)
487 usage(1, "multiple -r flags");
488 else if (!*++arg)
489 usage(1, "-r requires device name");
490 else
491 rootdevname = *arg;
492 break;
493 case 'b':
494 boothowto |= RB_ASKNAME;
495 break;
496 case 'a':
497 boothowto &= ~RB_SINGLE;
498 break;
499 case 's':
500 boothowto |= RB_SINGLE;
501 break;
502 case 'D':
503 boothowto |= RB_KDB;
504 break;
505 case 'q':
506 boothowto |= AB_QUIET;
507 break;
508
509 default:
510 usage(1, (char *) 0);
511 /* NOTREACHED */
512 break;
513 }
514 flg = ++arg;
515 }
516
517 /* check MPU */
518 if (chkmpu() == 0)
519 xerrx(1, "Can't boot NetBSD on 68000/010");
520
521 argc -= arg - argv;
522 argv = arg;
523
524 if (argc != 1)
525 usage(1, (char *) 0);
526
527 kernel = *argv;
528
529 rootdev = bootdev(rootdevname ? rootdevname : DEFAULT_ROOTDEVNAME);
530
531 if (opt_v)
532 xwarnx("boothowto 0x%x", boothowto);
533
534 tramp = read_kernel(kernel);
535
536 tramp->xk.rootdev = rootdev;
537 tramp->xk.boothowto = boothowto;
538
539 /*
540 * we never return, and make sure the disk cache
541 * be flushed (if write-back cache is enabled)
542 */
543 if (opt_v)
544 xwarnx("flush disk cache...");
545
546 i = DOS_FFLUSH_SET(1); /* enable fflush */
547 DOS_FFLUSH(); /* then, issue fflush */
548 (void) DOS_FFLUSH_SET(i); /* restore old mode just in case */
549
550 /*
551 * the program assumes the MPU caches off
552 */
553 if (opt_v)
554 xwarnx("flush and disable MPU caches...");
555
556 IOCS_CACHE_MD(-1); /* flush */
557 if (!opt_N)
558 IOCS_CACHE_MD(0); /* disable both caches */
559
560 if (opt_v)
561 xwarnx("Jumping to the kernel. Good Luck!");
562
563 if (opt_N)
564 xerrx(0, "But don't actually do it.");
565
566 DOS_SUPER_JSR((void (*)(void)) tramp, ®s, ®s);
567
568 /* NOTREACHED */
569
570 xwarnx("??? return from kernel");
571
572 return 1;
573 }
574