source: trunk/minix/boot/boot.c@ 20

Last change on this file since 20 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 43.1 KB
RevLine 
[9]1/* boot.c - Load and start Minix. Author: Kees J. Bot
2 * 27 Dec 1991
3 */
4
5char version[]= "2.20";
6
7#define BIOS (!UNIX) /* Either uses BIOS or UNIX syscalls. */
8
9#define nil 0
10#define _POSIX_SOURCE 1
11#define _MINIX 1
12#include <stddef.h>
13#include <sys/types.h>
14#include <sys/stat.h>
15#include <stdlib.h>
16#include <stdio.h>
17#include <limits.h>
18#include <string.h>
19#include <errno.h>
20#include <ibm/partition.h>
21#include <minix/config.h>
22#include <minix/type.h>
23#include <minix/com.h>
24#include <minix/dmap.h>
25#include <minix/const.h>
26#include <minix/minlib.h>
27#include <minix/syslib.h>
28#if BIOS
29#include <kernel/const.h>
30#include <kernel/type.h>
31#endif
32#if UNIX
33#include <stdio.h>
34#include <time.h>
35#include <unistd.h>
36#include <fcntl.h>
37#include <signal.h>
38#include <termios.h>
39#endif
40#include "rawfs.h"
41#undef EXTERN
42#define EXTERN /* Empty */
43#include "boot.h"
44
45#define arraysize(a) (sizeof(a) / sizeof((a)[0]))
46#define arraylimit(a) ((a) + arraysize(a))
47#define between(a, c, z) ((unsigned) ((c) - (a)) <= ((z) - (a)))
48
49int fsok= -1; /* File system state. Initially unknown. */
50
51static int block_size;
52
53#if BIOS
54
55/* this data is reserved for BIOS int 0x13 to put the 'specification packet'
56 * in. It has a structure of course, but we don't define a struct because
57 * of compiler padding. We fiddle out the bytes ourselves later.
58 */
59unsigned char boot_spec[24];
60
61char *bios_err(int err)
62/* Translate BIOS error code to a readable string. (This is a rare trait
63 * known as error checking and reporting. Take a good look at it, you won't
64 * see it often.)
65 */
66{
67 static struct errlist {
68 int err;
69 char *what;
70 } errlist[] = {
71#if !DOS
72 { 0x00, "No error" },
73 { 0x01, "Invalid command" },
74 { 0x02, "Address mark not found" },
75 { 0x03, "Disk write-protected" },
76 { 0x04, "Sector not found" },
77 { 0x05, "Reset failed" },
78 { 0x06, "Floppy disk removed" },
79 { 0x07, "Bad parameter table" },
80 { 0x08, "DMA overrun" },
81 { 0x09, "DMA crossed 64 KB boundary" },
82 { 0x0A, "Bad sector flag" },
83 { 0x0B, "Bad track flag" },
84 { 0x0C, "Media type not found" },
85 { 0x0D, "Invalid number of sectors on format" },
86 { 0x0E, "Control data address mark detected" },
87 { 0x0F, "DMA arbitration level out of range" },
88 { 0x10, "Uncorrectable CRC or ECC data error" },
89 { 0x11, "ECC corrected data error" },
90 { 0x20, "Controller failed" },
91 { 0x40, "Seek failed" },
92 { 0x80, "Disk timed-out" },
93 { 0xAA, "Drive not ready" },
94 { 0xBB, "Undefined error" },
95 { 0xCC, "Write fault" },
96 { 0xE0, "Status register error" },
97 { 0xFF, "Sense operation failed" }
98#else /* DOS */
99 { 0x00, "No error" },
100 { 0x01, "Function number invalid" },
101 { 0x02, "File not found" },
102 { 0x03, "Path not found" },
103 { 0x04, "Too many open files" },
104 { 0x05, "Access denied" },
105 { 0x06, "Invalid handle" },
106 { 0x0C, "Access code invalid" },
107#endif /* DOS */
108 };
109 struct errlist *errp;
110
111 for (errp= errlist; errp < arraylimit(errlist); errp++) {
112 if (errp->err == err) return errp->what;
113 }
114 return "Unknown error";
115}
116
117char *unix_err(int err)
118/* Translate the few errors rawfs can give. */
119{
120 switch (err) {
121 case ENOENT: return "No such file or directory";
122 case ENOTDIR: return "Not a directory";
123 default: return "Unknown error";
124 }
125}
126
127void rwerr(char *rw, off_t sec, int err)
128{
129 printf("\n%s error 0x%02x (%s) at sector %ld absolute\n",
130 rw, err, bios_err(err), sec);
131}
132
133void readerr(off_t sec, int err) { rwerr("Read", sec, err); }
134void writerr(off_t sec, int err) { rwerr("Write", sec, err); }
135
136void readblock(off_t blk, char *buf, int block_size)
137/* Read blocks for the rawfs package. */
138{
139 int r;
140 u32_t sec= lowsec + blk * RATIO(block_size);
141
142 if(!block_size) {
143 printf("block_size 0\n");
144 exit(1);
145 }
146
147 if ((r= readsectors(mon2abs(buf), sec, 1 * RATIO(block_size))) != 0) {
148 readerr(sec, r); exit(1);
149 }
150}
151
152#define istty (1)
153#define alarm(n) (0)
154
155#endif /* BIOS */
156
157#if UNIX
158
159/* The Minix boot block must start with these bytes: */
160char boot_magic[] = { 0x31, 0xC0, 0x8E, 0xD8, 0xFA, 0x8E, 0xD0, 0xBC };
161
162struct biosdev {
163 char *name; /* Name of device. */
164 int device; /* Device to edit parameters. */
165} bootdev;
166
167struct termios termbuf;
168int istty;
169
170void quit(int status)
171{
172 if (istty) (void) tcsetattr(0, TCSANOW, &termbuf);
173 exit(status);
174}
175
176#define exit(s) quit(s)
177
178void report(char *label)
179/* edparams: label: No such file or directory */
180{
181 fprintf(stderr, "edparams: %s: %s\n", label, strerror(errno));
182}
183
184void fatal(char *label)
185{
186 report(label);
187 exit(1);
188}
189
190void *alloc(void *m, size_t n)
191{
192 m= m == nil ? malloc(n) : realloc(m, n);
193 if (m == nil) fatal("");
194 return m;
195}
196
197#define malloc(n) alloc(nil, n)
198#define realloc(m, n) alloc(m, n)
199
200#define mon2abs(addr) ((void *) (addr))
201
202int rwsectors(int rw, void *addr, u32_t sec, int nsec)
203{
204 ssize_t r;
205 size_t len= nsec * SECTOR_SIZE;
206
207 if (lseek(bootdev.device, sec * SECTOR_SIZE, SEEK_SET) == -1)
208 return errno;
209
210 if (rw == 0) {
211 r= read(bootdev.device, (char *) addr, len);
212 } else {
213 r= write(bootdev.device, (char *) addr, len);
214 }
215 if (r == -1) return errno;
216 if (r != len) return EIO;
217 return 0;
218}
219
220#define readsectors(a, s, n) rwsectors(0, (a), (s), (n))
221#define writesectors(a, s, n) rwsectors(1, (a), (s), (n))
222#define readerr(sec, err) (errno= (err), report(bootdev.name))
223#define writerr(sec, err) (errno= (err), report(bootdev.name))
224#define putch(c) putchar(c)
225#define unix_err(err) strerror(err)
226
227void readblock(off_t blk, char *buf, int block_size)
228/* Read blocks for the rawfs package. */
229{
230 if(!block_size) fatal("block_size 0");
231 errno= EIO;
232 if (lseek(bootdev.device, blk * block_size, SEEK_SET) == -1
233 || read(bootdev.device, buf, block_size) != block_size)
234 {
235 fatal(bootdev.name);
236 }
237}
238
239sig_atomic_t trapsig;
240
241void trap(int sig)
242{
243 trapsig= sig;
244 signal(sig, trap);
245}
246
247int escape(void)
248{
249 if (trapsig == SIGINT) {
250 trapsig= 0;
251 return 1;
252 }
253 return 0;
254}
255
256static unsigned char unchar;
257
258int getch(void)
259{
260 unsigned char c;
261
262 fflush(stdout);
263
264 if (unchar != 0) {
265 c= unchar;
266 unchar= 0;
267 return c;
268 }
269
270 switch (read(0, &c, 1)) {
271 case -1:
272 if (errno != EINTR) fatal("");
273 return(ESC);
274 case 0:
275 if (istty) putch('\n');
276 exit(0);
277 default:
278 if (istty && c == termbuf.c_cc[VEOF]) {
279 putch('\n');
280 exit(0);
281 }
282 return c;
283 }
284}
285
286#define ungetch(c) ((void) (unchar = (c)))
287
288#define get_tick() ((u32_t) time(nil))
289#define clear_screen() printf("[clear]")
290#define boot_device(device) printf("[boot %s]\n", device)
291#define ctty(line) printf("[ctty %s]\n", line)
292#define bootminix() (run_trailer() && printf("[boot]\n"))
293#define off() printf("[off]")
294
295#endif /* UNIX */
296
297char *readline(void)
298/* Read a line including a newline with echoing. */
299{
300 char *line;
301 size_t i, z;
302 int c;
303
304 i= 0;
305 z= 20;
306 line= malloc(z * sizeof(char));
307
308 do {
309 c= getch();
310
311 if (strchr("\b\177\25\30", c) != nil) {
312 /* Backspace, DEL, ctrl-U, or ctrl-X. */
313 do {
314 if (i == 0) break;
315 printf("\b \b");
316 i--;
317 } while (c == '\25' || c == '\30');
318 } else
319 if (c < ' ' && c != '\n') {
320 putch('\7');
321 } else {
322 putch(c);
323 line[i++]= c;
324 if (i == z) {
325 z*= 2;
326 line= realloc(line, z * sizeof(char));
327 }
328 }
329 } while (c != '\n');
330 line[i]= 0;
331 return line;
332}
333
334int sugar(char *tok)
335/* Recognize special tokens. */
336{
337 return strchr("=(){};\n", tok[0]) != nil;
338}
339
340char *onetoken(char **aline)
341/* Returns a string with one token for tokenize. */
342{
343 char *line= *aline;
344 size_t n;
345 char *tok;
346
347 /* Skip spaces and runs of newlines. */
348 while (*line == ' ' || (*line == '\n' && line[1] == '\n')) line++;
349
350 *aline= line;
351
352 /* Don't do odd junk (nor the terminating 0!). */
353 if ((unsigned) *line < ' ' && *line != '\n') return nil;
354
355 if (*line == '(') {
356 /* Function argument, anything goes but () must match. */
357 int depth= 0;
358
359 while ((unsigned) *line >= ' ') {
360 if (*line == '(') depth++;
361 if (*line++ == ')' && --depth == 0) break;
362 }
363 } else
364 if (sugar(line)) {
365 /* Single character token. */
366 line++;
367 } else {
368 /* Multicharacter token. */
369 do line++; while ((unsigned) *line > ' ' && !sugar(line));
370 }
371 n= line - *aline;
372 tok= malloc((n + 1) * sizeof(char));
373 memcpy(tok, *aline, n);
374 tok[n]= 0;
375 if (tok[0] == '\n') tok[0]= ';'; /* ';' same as '\n' */
376
377 *aline= line;
378 return tok;
379}
380
381/* Typed commands form strings of tokens. */
382
383typedef struct token {
384 struct token *next; /* Next in a command chain. */
385 char *token;
386} token;
387
388token **tokenize(token **acmds, char *line)
389/* Takes a line apart to form tokens. The tokens are inserted into a command
390 * chain at *acmds. Tokenize returns a reference to where another line could
391 * be added. Tokenize looks at spaces as token separators, and recognizes only
392 * ';', '=', '{', '}', and '\n' as single character tokens. One token is
393 * formed from '(' and ')' with anything in between as long as more () match.
394 */
395{
396 char *tok;
397 token *newcmd;
398
399 while ((tok= onetoken(&line)) != nil) {
400 newcmd= malloc(sizeof(*newcmd));
401 newcmd->token= tok;
402 newcmd->next= *acmds;
403 *acmds= newcmd;
404 acmds= &newcmd->next;
405 }
406 return acmds;
407}
408
409token *cmds; /* String of commands to execute. */
410int err; /* Set on an error. */
411
412char *poptoken(void)
413/* Pop one token off the command chain. */
414{
415 token *cmd= cmds;
416 char *tok= cmd->token;
417
418 cmds= cmd->next;
419 free(cmd);
420
421 return tok;
422}
423
424void voidtoken(void)
425/* Remove one token from the command chain. */
426{
427 free(poptoken());
428}
429
430void parse_code(char *code)
431/* Tokenize a string of monitor code, making sure there is a delimiter. It is
432 * to be executed next. (Prepended to the current input.)
433 */
434{
435 if (cmds != nil && cmds->token[0] != ';') (void) tokenize(&cmds, ";");
436 (void) tokenize(&cmds, code);
437}
438
439int interrupt(void)
440/* Clean up after an ESC has been typed. */
441{
442 if (escape()) {
443 printf("[ESC]\n");
444 err= 1;
445 return 1;
446 }
447 return 0;
448}
449
450#if BIOS
451
452int activate;
453
454struct biosdev {
455 char name[8];
456 int device, primary, secondary;
457} bootdev, tmpdev;
458
459int get_master(char *master, struct part_entry **table, u32_t pos)
460/* Read a master boot sector and its partition table. */
461{
462 int r, n;
463 struct part_entry *pe, **pt;
464
465 if ((r= readsectors(mon2abs(master), pos, 1)) != 0) return r;
466
467 pe= (struct part_entry *) (master + PART_TABLE_OFF);
468 for (pt= table; pt < table + NR_PARTITIONS; pt++) *pt= pe++;
469
470 /* DOS has the misguided idea that partition tables must be sorted. */
471 if (pos != 0) return 0; /* But only the primary. */
472
473 n= NR_PARTITIONS;
474 do {
475 for (pt= table; pt < table + NR_PARTITIONS-1; pt++) {
476 if (pt[0]->sysind == NO_PART
477 || pt[0]->lowsec > pt[1]->lowsec) {
478 pe= pt[0]; pt[0]= pt[1]; pt[1]= pe;
479 }
480 }
481 } while (--n > 0);
482 return 0;
483}
484
485void initialize(void)
486{
487 char master[SECTOR_SIZE];
488 struct part_entry *table[NR_PARTITIONS];
489 int r, p;
490 u32_t masterpos;
491 char *argp;
492
493 /* Copy the boot program to the far end of low memory, this must be
494 * done to get out of the way of Minix, and to put the data area
495 * cleanly inside a 64K chunk if using BIOS I/O (no DMA problems).
496 */
497 u32_t oldaddr= caddr;
498 u32_t memend= mem[0].base + mem[0].size;
499 u32_t newaddr= (memend - runsize) & ~0x0000FL;
500#if !DOS
501 u32_t dma64k= (memend - 1) & ~0x0FFFFL;
502
503
504 /* Check if data segment crosses a 64K boundary. */
505 if (newaddr + (daddr - caddr) < dma64k) {
506 newaddr= (dma64k - runsize) & ~0x0000FL;
507 }
508#endif
509
510 /* Set the new caddr for relocate. */
511 caddr= newaddr;
512
513 /* Copy code and data. */
514 raw_copy(newaddr, oldaddr, runsize);
515
516 /* Make the copy running. */
517 relocate();
518
519#if !DOS
520
521 /* Take the monitor out of the memory map if we have memory to spare,
522 * and also keep the BIOS data area safe (1.5K), plus a bit extra for
523 * where we may have to put a.out headers for older kernels.
524 */
525 if (mon_return = (mem[1].size > 512*1024L)) mem[0].size = newaddr;
526 mem[0].base += 2048;
527 mem[0].size -= 2048;
528
529 /* Find out what the boot device and partition was. */
530 bootdev.name[0]= 0;
531 bootdev.device= device;
532 bootdev.primary= -1;
533 bootdev.secondary= -1;
534
535 if (device < 0x80) {
536 /* Floppy. */
537 strcpy(bootdev.name, "fd0");
538 bootdev.name[2] += bootdev.device;
539 return;
540 }
541
542 /* Disk: Get the partition table from the very first sector, and
543 * determine the partition we booted from using the information from
544 * the booted partition entry as passed on by the bootstrap (rem_part).
545 * All we need from it is the partition offset.
546 */
547 raw_copy(mon2abs(&lowsec),
548 vec2abs(&rem_part) + offsetof(struct part_entry, lowsec),
549 sizeof(lowsec));
550
551 masterpos= 0; /* Master bootsector position. */
552
553 for (;;) {
554 /* Extract the partition table from the master boot sector. */
555 if ((r= get_master(master, table, masterpos)) != 0) {
556 readerr(masterpos, r); exit(1);
557 }
558
559 /* See if you can find "lowsec" back. */
560 for (p= 0; p < NR_PARTITIONS; p++) {
561 if (lowsec - table[p]->lowsec < table[p]->size) break;
562 }
563
564 if (lowsec == table[p]->lowsec) { /* Found! */
565 if (bootdev.primary < 0)
566 bootdev.primary= p;
567 else
568 bootdev.secondary= p;
569 break;
570 }
571
572 if (p == NR_PARTITIONS || bootdev.primary >= 0
573 || table[p]->sysind != MINIX_PART) {
574 /* The boot partition cannot be named, this only means
575 * that "bootdev" doesn't work.
576 */
577 bootdev.device= -1;
578 return;
579 }
580
581 /* See if the primary partition is subpartitioned. */
582 bootdev.primary= p;
583 masterpos= table[p]->lowsec;
584 }
585 strcpy(bootdev.name, "d0p0");
586 bootdev.name[1] += (device - 0x80);
587 bootdev.name[3] += bootdev.primary;
588 if (bootdev.secondary >= 0) {
589 strcat(bootdev.name, "s0");
590 bootdev.name[5] += bootdev.secondary;
591 }
592
593#else /* DOS */
594 /* Take the monitor out of the memory map if we have memory to spare,
595 * note that only half our PSP is needed at the new place, the first
596 * half is to be kept in its place.
597 */
598 if (mem[1].size > 0) mem[0].size = newaddr + 0x80 - mem[0].base;
599
600 /* Parse the command line. */
601 argp= PSP + 0x81;
602 argp[PSP[0x80]]= 0;
603 while (between('\1', *argp, ' ')) argp++;
604 vdisk= argp;
605 while (!between('\0', *argp, ' ')) argp++;
606 while (between('\1', *argp, ' ')) *argp++= 0;
607 if (*vdisk == 0) {
608 printf("\nUsage: boot <vdisk> [commands ...]\n");
609 exit(1);
610 }
611 drun= *argp == 0 ? "main" : argp;
612
613 if ((r= dev_open()) != 0) {
614 printf("\n%s: Error %02x (%s)\n", vdisk, r, bios_err(r));
615 exit(1);
616 }
617
618 /* Find the active partition on the virtual disk. */
619 if ((r= get_master(master, table, 0)) != 0) {
620 readerr(0, r); exit(1);
621 }
622
623 strcpy(bootdev.name, "d0");
624 bootdev.primary= -1;
625 for (p= 0; p < NR_PARTITIONS; p++) {
626 if (table[p]->bootind != 0 && table[p]->sysind == MINIX_PART) {
627 bootdev.primary= p;
628 strcat(bootdev.name, "p0");
629 bootdev.name[3] += p;
630 lowsec= table[p]->lowsec;
631 break;
632 }
633 }
634#endif /* DOS */
635}
636
637#endif /* BIOS */
638
639/* Reserved names: */
640enum resnames {
641 R_NULL, R_BOOT, R_CTTY, R_DELAY, R_ECHO, R_EXIT, R_HELP,
642 R_LS, R_MENU, R_OFF, R_SAVE, R_SET, R_TRAP, R_UNSET
643};
644
645char resnames[][6] = {
646 "", "boot", "ctty", "delay", "echo", "exit", "help",
647 "ls", "menu", "off", "save", "set", "trap", "unset",
648};
649
650/* Using this for all null strings saves a lot of memory. */
651#define null (resnames[0])
652
653int reserved(char *s)
654/* Recognize reserved strings. */
655{
656 int r;
657
658 for (r= R_BOOT; r <= R_UNSET; r++) {
659 if (strcmp(s, resnames[r]) == 0) return r;
660 }
661 return R_NULL;
662}
663
664void sfree(char *s)
665/* Free a non-null string. */
666{
667 if (s != nil && s != null) free(s);
668}
669
670char *copystr(char *s)
671/* Copy a non-null string using malloc. */
672{
673 char *c;
674
675 if (*s == 0) return null;
676 c= malloc((strlen(s) + 1) * sizeof(char));
677 strcpy(c, s);
678 return c;
679}
680
681int is_default(environment *e)
682{
683 return (e->flags & E_SPECIAL) && e->defval == nil;
684}
685
686environment **searchenv(char *name)
687{
688 environment **aenv= &env;
689
690 while (*aenv != nil && strcmp((*aenv)->name, name) != 0) {
691 aenv= &(*aenv)->next;
692 }
693
694 return aenv;
695}
696
697#define b_getenv(name) (*searchenv(name))
698/* Return the environment *structure* belonging to name, or nil if not found. */
699
700char *b_value(char *name)
701/* The value of a variable. */
702{
703 environment *e= b_getenv(name);
704
705 return e == nil || !(e->flags & E_VAR) ? nil : e->value;
706}
707
708char *b_body(char *name)
709/* The value of a function. */
710{
711 environment *e= b_getenv(name);
712
713 return e == nil || !(e->flags & E_FUNCTION) ? nil : e->value;
714}
715
716int b_setenv(int flags, char *name, char *arg, char *value)
717/* Change the value of an environment variable. Returns the flags of the
718 * variable if you are not allowed to change it, 0 otherwise.
719 */
720{
721 environment **aenv, *e;
722
723 if (*(aenv= searchenv(name)) == nil) {
724 if (reserved(name)) return E_RESERVED;
725 e= malloc(sizeof(*e));
726 e->name= copystr(name);
727 e->flags= flags;
728 e->defval= nil;
729 e->next= nil;
730 *aenv= e;
731 } else {
732 e= *aenv;
733
734 /* Don't change special variables to functions or vv. */
735 if (e->flags & E_SPECIAL
736 && (e->flags & E_FUNCTION) != (flags & E_FUNCTION)
737 ) return e->flags;
738
739 e->flags= (e->flags & E_STICKY) | flags;
740 if (is_default(e)) {
741 e->defval= e->value;
742 } else {
743 sfree(e->value);
744 }
745 sfree(e->arg);
746 }
747 e->arg= copystr(arg);
748 e->value= copystr(value);
749
750 return 0;
751}
752
753int b_setvar(int flags, char *name, char *value)
754/* Set variable or simple function. */
755{
756 int r;
757
758 if((r=b_setenv(flags, name, null, value))) {
759 return r;
760 }
761
762 return r;
763}
764
765void b_unset(char *name)
766/* Remove a variable from the environment. A special variable is reset to
767 * its default value.
768 */
769{
770 environment **aenv, *e;
771
772 if ((e= *(aenv= searchenv(name))) == nil) return;
773
774 if (e->flags & E_SPECIAL) {
775 if (e->defval != nil) {
776 sfree(e->arg);
777 e->arg= null;
778 sfree(e->value);
779 e->value= e->defval;
780 e->defval= nil;
781 }
782 } else {
783 sfree(e->name);
784 sfree(e->arg);
785 sfree(e->value);
786 *aenv= e->next;
787 free(e);
788 }
789}
790
791long a2l(char *a)
792/* Cheap atol(). */
793{
794 int sign= 1;
795 long n= 0;
796
797 if (*a == '-') { sign= -1; a++; }
798
799 while (between('0', *a, '9')) n= n * 10 + (*a++ - '0');
800
801 return sign * n;
802}
803
804char *ul2a(u32_t n, unsigned b)
805/* Transform a long number to ascii at base b, (b >= 8). */
806{
807 static char num[(CHAR_BIT * sizeof(n) + 2) / 3 + 1];
808 char *a= arraylimit(num) - 1;
809 static char hex[16] = "0123456789ABCDEF";
810
811 do *--a = hex[(int) (n % b)]; while ((n/= b) > 0);
812 return a;
813}
814
815char *ul2a10(u32_t n)
816/* Transform a long number to ascii at base 10. */
817{
818 return ul2a(n, 10);
819}
820
821unsigned a2x(char *a)
822/* Ascii to hex. */
823{
824 unsigned n= 0;
825 int c;
826
827 for (;;) {
828 c= *a;
829 if (between('0', c, '9')) c= c - '0' + 0x0;
830 else
831 if (between('A', c, 'F')) c= c - 'A' + 0xA;
832 else
833 if (between('a', c, 'f')) c= c - 'a' + 0xa;
834 else
835 break;
836 n= (n<<4) | c;
837 a++;
838 }
839 return n;
840}
841
842void get_parameters(void)
843{
844 char params[SECTOR_SIZE + 1];
845 token **acmds;
846 int r, bus, processor;
847 memory *mp;
848 static char bus_type[][4] = {
849 "xt", "at", "mca"
850 };
851 static char vid_type[][4] = {
852 "mda", "cga", "ega", "ega", "vga", "vga"
853 };
854 static char vid_chrome[][6] = {
855 "mono", "color"
856 };
857
858 /* Variables that Minix needs: */
859 b_setvar(E_SPECIAL|E_VAR|E_DEV, "rootdev", "ram");
860 b_setvar(E_SPECIAL|E_VAR|E_DEV, "ramimagedev", "bootdev");
861 b_setvar(E_SPECIAL|E_VAR, "ramsize", "0");
862#if BIOS
863 processor = getprocessor();
864 if(processor == 1586) processor = 686;
865 b_setvar(E_SPECIAL|E_VAR, "processor", ul2a10(processor));
866 b_setvar(E_SPECIAL|E_VAR, "bus", bus_type[get_bus()]);
867 b_setvar(E_SPECIAL|E_VAR, "video", vid_type[get_video()]);
868 b_setvar(E_SPECIAL|E_VAR, "chrome", vid_chrome[get_video() & 1]);
869 params[0]= 0;
870 for (mp= mem; mp < arraylimit(mem); mp++) {
871 if (mp->size == 0) continue;
872 if (params[0] != 0) strcat(params, ",");
873 strcat(params, ul2a(mp->base, 0x10));
874 strcat(params, ":");
875 strcat(params, ul2a(mp->size, 0x10));
876 }
877 b_setvar(E_SPECIAL|E_VAR, "memory", params);
878
879#if DOS
880 b_setvar(E_SPECIAL|E_VAR, "dosfile-d0", vdisk);
881#endif
882
883#endif
884#if UNIX
885 b_setvar(E_SPECIAL|E_VAR, "processor", "?");
886 b_setvar(E_SPECIAL|E_VAR, "bus", "?");
887 b_setvar(E_SPECIAL|E_VAR, "video", "?");
888 b_setvar(E_SPECIAL|E_VAR, "chrome", "?");
889 b_setvar(E_SPECIAL|E_VAR, "memory", "?");
890 b_setvar(E_SPECIAL|E_VAR, "c0", "?");
891#endif
892
893 /* Variables boot needs: */
894 b_setvar(E_SPECIAL|E_VAR, "image", "boot/image");
895 b_setvar(E_SPECIAL|E_FUNCTION, "leader",
896 "echo --- Welcome to MINIX 3. This is the boot monitor. ---\\n");
897 b_setvar(E_SPECIAL|E_FUNCTION, "main", "menu");
898 b_setvar(E_SPECIAL|E_FUNCTION, "trailer", "");
899
900 /* Default hidden menu function: */
901 b_setenv(E_RESERVED|E_FUNCTION, null, "=,Start MINIX", "boot");
902
903 /* Tokenize bootparams sector. */
904 if ((r= readsectors(mon2abs(params), lowsec+PARAMSEC, 1)) != 0) {
905 readerr(lowsec+PARAMSEC, r);
906 exit(1);
907 }
908 params[SECTOR_SIZE]= 0;
909 acmds= tokenize(&cmds, params);
910
911 /* Stuff the default action into the command chain. */
912#if UNIX
913 (void) tokenize(acmds, ":;");
914#elif DOS
915 (void) tokenize(tokenize(acmds, ":;leader;"), drun);
916#else /* BIOS */
917 (void) tokenize(acmds, ":;leader;main");
918#endif
919}
920
921char *addptr;
922
923void addparm(char *n)
924{
925 while (*n != 0 && *addptr != 0) *addptr++ = *n++;
926}
927
928void save_parameters(void)
929/* Save nondefault environment variables to the bootparams sector. */
930{
931 environment *e;
932 char params[SECTOR_SIZE + 1];
933 int r;
934
935 /* Default filling: */
936 memset(params, '\n', SECTOR_SIZE);
937
938 /* Don't touch the 0! */
939 params[SECTOR_SIZE]= 0;
940 addptr= params;
941
942 for (e= env; e != nil; e= e->next) {
943 if (e->flags & E_RESERVED || is_default(e)) continue;
944
945 addparm(e->name);
946 if (e->flags & E_FUNCTION) {
947 addparm("(");
948 addparm(e->arg);
949 addparm(")");
950 } else {
951 addparm((e->flags & (E_DEV|E_SPECIAL)) != E_DEV
952 ? "=" : "=d ");
953 }
954 addparm(e->value);
955 if (*addptr == 0) {
956 printf("The environment is too big\n");
957 return;
958 }
959 *addptr++= '\n';
960 }
961
962 /* Save the parameters on disk. */
963 if ((r= writesectors(mon2abs(params), lowsec+PARAMSEC, 1)) != 0) {
964 writerr(lowsec+PARAMSEC, r);
965 printf("Can't save environment\n");
966 }
967}
968
969void show_env(void)
970/* Show the environment settings. */
971{
972 environment *e;
973 unsigned more= 0;
974 int c;
975
976 for (e= env; e != nil; e= e->next) {
977 if (e->flags & E_RESERVED) continue;
978 if (!istty && is_default(e)) continue;
979
980 if (e->flags & E_FUNCTION) {
981 printf("%s(%s) %s\n", e->name, e->arg, e->value);
982 } else {
983 printf(is_default(e) ? "%s = (%s)\n" : "%s = %s\n",
984 e->name, e->value);
985 }
986
987 if (e->next != nil && istty && ++more % 20 == 0) {
988 printf("More? ");
989 c= getch();
990 if (c == ESC || c > ' ') {
991 putch('\n');
992 if (c > ' ') ungetch(c);
993 break;
994 }
995 printf("\b\b\b\b\b\b");
996 }
997 }
998}
999
1000int numprefix(char *s, char **ps)
1001/* True iff s is a string of digits. *ps will be set to the first nondigit
1002 * if non-nil, otherwise the string should end.
1003 */
1004{
1005 char *n= s;
1006
1007 while (between('0', *n, '9')) n++;
1008
1009 if (n == s) return 0;
1010
1011 if (ps == nil) return *n == 0;
1012
1013 *ps= n;
1014 return 1;
1015}
1016
1017int numeric(char *s)
1018{
1019 return numprefix(s, (char **) nil);
1020}
1021
1022#if BIOS
1023
1024/* Device numbers of standard MINIX devices. */
1025#define DEV_FD0 0x0200
1026static dev_t dev_cNd0[] = { 0x0300, 0x0800, 0x0A00, 0x0C00, 0x1000 };
1027#define minor_p0s0 128
1028
1029static int block_size;
1030
1031dev_t name2dev(char *name)
1032/* Translate, say, /dev/c0d0p2 to a device number. If the name can't be
1033 * found on the boot device, then do some guesswork. The global structure
1034 * "tmpdev" will be filled in based on the name, so that "boot d1p0" knows
1035 * what device to boot without interpreting device numbers.
1036 */
1037{
1038 dev_t dev;
1039 ino_t ino;
1040 int drive;
1041 struct stat st;
1042 char *n, *s;
1043
1044 /* "boot *d0p2" means: make partition 2 active before you boot it. */
1045 if ((activate= (name[0] == '*'))) name++;
1046
1047 /* The special name "bootdev" must be translated to the boot device. */
1048 if (strcmp(name, "bootdev") == 0) {
1049 if (bootdev.device == -1) {
1050 printf("The boot device could not be named\n");
1051 errno= 0;
1052 return -1;
1053 }
1054 name= bootdev.name;
1055 }
1056
1057 /* If our boot device doesn't have a file system, or we want to know
1058 * what a name means for the BIOS, then we need to interpret the
1059 * device name ourselves: "fd" = floppy, "c0d0" = hard disk, etc.
1060 */
1061 tmpdev.device= tmpdev.primary= tmpdev.secondary= -1;
1062 dev= -1;
1063 n= name;
1064 if (strncmp(n, "/dev/", 5) == 0) n+= 5;
1065
1066 if (strcmp(n, "ram") == 0) {
1067 dev= DEV_RAM;
1068 } else
1069 if (strcmp(n, "boot") == 0) {
1070 dev= DEV_BOOT;
1071 } else
1072 if (n[0] == 'f' && n[1] == 'd' && numeric(n+2)) {
1073 /* Floppy. */
1074 tmpdev.device= a2l(n+2);
1075 dev= DEV_FD0 + tmpdev.device;
1076 } else
1077 if ((n[0] == 'h' || n[0] == 's') && n[1] == 'd' && numprefix(n+2, &s)
1078 && (*s == 0 || (between('a', *s, 'd') && s[1] == 0))
1079 ) {
1080 /* Old style hard disk (backwards compatibility.) */
1081 dev= a2l(n+2);
1082 tmpdev.device= dev / (1 + NR_PARTITIONS);
1083 tmpdev.primary= (dev % (1 + NR_PARTITIONS)) - 1;
1084 if (*s != 0) {
1085 /* Subpartition. */
1086 tmpdev.secondary= *s - 'a';
1087 dev= minor_p0s0
1088 + (tmpdev.device * NR_PARTITIONS
1089 + tmpdev.primary) * NR_PARTITIONS
1090 + tmpdev.secondary;
1091 }
1092 tmpdev.device+= 0x80;
1093 dev+= n[0] == 'h' ? dev_cNd0[0] : dev_cNd0[2];
1094 } else {
1095 /* Hard disk. */
1096 int ctrlr= 0;
1097
1098 if (n[0] == 'c' && between('0', n[1], '4')) {
1099 ctrlr= (n[1] - '0');
1100 tmpdev.device= 0;
1101 n+= 2;
1102 }
1103 if (n[0] == 'd' && between('0', n[1], '7')) {
1104 tmpdev.device= (n[1] - '0');
1105 n+= 2;
1106 if (n[0] == 'p' && between('0', n[1], '3')) {
1107 tmpdev.primary= (n[1] - '0');
1108 n+= 2;
1109 if (n[0] == 's' && between('0', n[1], '3')) {
1110 tmpdev.secondary= (n[1] - '0');
1111 n+= 2;
1112 }
1113 }
1114 }
1115 if (*n == 0) {
1116 dev= dev_cNd0[ctrlr];
1117 if (tmpdev.secondary < 0) {
1118 dev += tmpdev.device * (NR_PARTITIONS+1)
1119 + (tmpdev.primary + 1);
1120 } else {
1121 dev += minor_p0s0
1122 + (tmpdev.device * NR_PARTITIONS
1123 + tmpdev.primary) * NR_PARTITIONS
1124 + tmpdev.secondary;
1125 }
1126 tmpdev.device+= 0x80;
1127 }
1128 }
1129
1130 /* Look the name up on the boot device for the UNIX device number. */
1131 if (fsok == -1) fsok= r_super(&block_size) != 0;
1132 if (fsok) {
1133 /* The current working directory is "/dev". */
1134 ino= r_lookup(r_lookup(ROOT_INO, "dev"), name);
1135
1136 if (ino != 0) {
1137 /* Name has been found, extract the device number. */
1138 r_stat(ino, &st);
1139 if (!S_ISBLK(st.st_mode)) {
1140 printf("%s is not a block device\n", name);
1141 errno= 0;
1142 return (dev_t) -1;
1143 }
1144 dev= st.st_rdev;
1145 }
1146 }
1147
1148 if (tmpdev.primary < 0) activate= 0; /* Careful now! */
1149
1150 if (dev == -1) {
1151 printf("Can't recognize '%s' as a device\n", name);
1152 errno= 0;
1153 }
1154 return dev;
1155}
1156
1157#if DEBUG
1158static void apm_perror(char *label, u16_t ax)
1159{
1160 unsigned ah;
1161 char *str;
1162
1163 ah= (ax >> 8);
1164 switch(ah)
1165 {
1166 case 0x01: str= "APM functionality disabled"; break;
1167 case 0x03: str= "interface not connected"; break;
1168 case 0x09: str= "unrecognized device ID"; break;
1169 case 0x0A: str= "parameter value out of range"; break;
1170 case 0x0B: str= "interface not engaged"; break;
1171 case 0x60: str= "unable to enter requested state"; break;
1172 case 0x86: str= "APM not present"; break;
1173 default: printf("%s: error 0x%02x\n", label, ah); return;
1174 }
1175 printf("%s: %s\n", label, str);
1176}
1177
1178#define apm_printf printf
1179#else
1180#define apm_perror(label, ax) ((void)0)
1181#define apm_printf
1182#endif
1183
1184static void off(void)
1185{
1186 bios_env_t be;
1187 unsigned al, ah;
1188
1189 /* Try to switch off the system. Print diagnostic information
1190 * that can be useful if the operation fails.
1191 */
1192
1193 be.ax= 0x5300; /* APM, Installation check */
1194 be.bx= 0; /* Device, APM BIOS */
1195 int15(&be);
1196 if (be.flags & FL_CARRY)
1197 {
1198 apm_perror("APM installation check failed", be.ax);
1199 return;
1200 }
1201 if (be.bx != (('P' << 8) | 'M'))
1202 {
1203 apm_printf("APM signature not found (got 0x%04x)\n", be.bx);
1204 return;
1205 }
1206
1207 ah= be.ax >> 8;
1208 if (ah > 9)
1209 ah= (ah >> 4)*10 + (ah & 0xf);
1210 al= be.ax & 0xff;
1211 if (al > 9)
1212 al= (al >> 4)*10 + (al & 0xf);
1213 apm_printf("APM version %u.%u%s%s%s%s%s\n",
1214 ah, al,
1215 (be.cx & 0x1) ? ", 16-bit PM" : "",
1216 (be.cx & 0x2) ? ", 32-bit PM" : "",
1217 (be.cx & 0x4) ? ", CPU-Idle" : "",
1218 (be.cx & 0x8) ? ", APM-disabled" : "",
1219 (be.cx & 0x10) ? ", APM-disengaged" : "");
1220
1221 /* Connect */
1222 be.ax= 0x5301; /* APM, Real mode interface connect */
1223 be.bx= 0x0000; /* APM BIOS */
1224 int15(&be);
1225 if (be.flags & FL_CARRY)
1226 {
1227 apm_perror("APM real mode connect failed", be.ax);
1228 return;
1229 }
1230
1231 /* Ask for a seat upgrade */
1232 be.ax= 0x530e; /* APM, Driver Version */
1233 be.bx= 0x0000; /* BIOS */
1234 be.cx= 0x0102; /* version 1.2 */
1235 int15(&be);
1236 if (be.flags & FL_CARRY)
1237 {
1238 apm_perror("Set driver version failed", be.ax);
1239 goto disco;
1240 }
1241
1242 /* Is this version really worth reporting. Well, if the system
1243 * does switch off, you won't see it anyway.
1244 */
1245 ah= be.ax >> 8;
1246 if (ah > 9)
1247 ah= (ah >> 4)*10 + (ah & 0xf);
1248 al= be.ax & 0xff;
1249 if (al > 9)
1250 al= (al >> 4)*10 + (al & 0xf);
1251 apm_printf("Got APM connection version %u.%u\n", ah, al);
1252
1253 /* Enable */
1254 be.ax= 0x5308; /* APM, Enable/disable power management */
1255 be.bx= 0x0001; /* All device managed by APM BIOS */
1256#if 0
1257 /* For old APM 1.0 systems, we need 0xffff. Assume that those
1258 * systems do not exist.
1259 */
1260 be.bx= 0xffff; /* All device managed by APM BIOS (compat) */
1261#endif
1262 be.cx= 0x0001; /* Enable power management */
1263 int15(&be);
1264 if (be.flags & FL_CARRY)
1265 {
1266 apm_perror("Enable power management failed", be.ax);
1267 goto disco;
1268 }
1269
1270 /* Off */
1271 be.ax= 0x5307; /* APM, Set Power State */
1272 be.bx= 0x0001; /* All devices managed by APM */
1273 be.cx= 0x0003; /* Off */
1274 int15(&be);
1275 if (be.flags & FL_CARRY)
1276 {
1277 apm_perror("Set power state failed", be.ax);
1278 goto disco;
1279 }
1280
1281 apm_printf("Power off sequence successfully completed.\n\n");
1282 apm_printf("Ha, ha, just kidding!\n");
1283
1284disco:
1285 /* Disconnect */
1286 be.ax= 0x5304; /* APM, interface disconnect */
1287 be.bx= 0x0000; /* APM BIOS */
1288 int15(&be);
1289 if (be.flags & FL_CARRY)
1290 {
1291 apm_perror("APM interface disconnect failed", be.ax);
1292 return;
1293 }
1294}
1295
1296#if !DOS
1297#define B_NOSIG -1 /* "No signature" error code. */
1298
1299int exec_bootstrap(void)
1300/* Load boot sector from the disk or floppy described by tmpdev and execute it.
1301 */
1302{
1303 int r, n, dirty= 0;
1304 char master[SECTOR_SIZE];
1305 struct part_entry *table[NR_PARTITIONS], dummy, *active= &dummy;
1306 u32_t masterpos;
1307
1308 active->lowsec= 0;
1309
1310 /* Select a partition table entry. */
1311 while (tmpdev.primary >= 0) {
1312 masterpos= active->lowsec;
1313
1314 if ((r= get_master(master, table, masterpos)) != 0) return r;
1315
1316 active= table[tmpdev.primary];
1317
1318 /* How does one check a partition table entry? */
1319 if (active->sysind == NO_PART) return B_NOSIG;
1320
1321 tmpdev.primary= tmpdev.secondary;
1322 tmpdev.secondary= -1;
1323 }
1324
1325 if (activate && !active->bootind) {
1326 for (n= 0; n < NR_PARTITIONS; n++) table[n]->bootind= 0;
1327 active->bootind= ACTIVE_FLAG;
1328 dirty= 1;
1329 }
1330
1331 /* Read the boot sector. */
1332 if ((r= readsectors(BOOTPOS, active->lowsec, 1)) != 0) return r;
1333
1334 /* Check signature word. */
1335 if (get_word(BOOTPOS+SIGNATOFF) != SIGNATURE) return B_NOSIG;
1336
1337 /* Write the partition table if a member must be made active. */
1338 if (dirty && (r= writesectors(mon2abs(master), masterpos, 1)) != 0)
1339 return r;
1340
1341 bootstrap(device, active);
1342}
1343
1344void boot_device(char *devname)
1345/* Boot the device named by devname. */
1346{
1347 dev_t dev= name2dev(devname);
1348 int save_dev= device;
1349 int r;
1350 char *err;
1351
1352 if (tmpdev.device < 0) {
1353 if (dev != -1) printf("Can't boot from %s\n", devname);
1354 return;
1355 }
1356
1357 /* Change current device and try to load and execute its bootstrap. */
1358 device= tmpdev.device;
1359
1360 if ((r= dev_open()) == 0) r= exec_bootstrap();
1361
1362 err= r == B_NOSIG ? "Not bootable" : bios_err(r);
1363 printf("Can't boot %s: %s\n", devname, err);
1364
1365 /* Restore boot device setting. */
1366 device= save_dev;
1367 (void) dev_open();
1368}
1369
1370void ctty(char *line)
1371{
1372 if (between('0', line[0], '3') && line[1] == 0) {
1373 serial_init(line[0] - '0');
1374 } else {
1375 printf("Bad serial line number: %s\n", line);
1376 }
1377}
1378
1379#else /* DOS */
1380
1381void boot_device(char *devname)
1382/* No booting of other devices under DOS. */
1383{
1384 printf("Can't boot devices under DOS\n");
1385}
1386
1387void ctty(char *line)
1388/* Don't know how to handle serial lines under DOS. */
1389{
1390 printf("No serial line support under DOS\n");
1391}
1392
1393#endif /* DOS */
1394#endif /* BIOS */
1395
1396void ls(char *dir)
1397/* List the contents of a directory. */
1398{
1399 ino_t ino;
1400 struct stat st;
1401 char name[NAME_MAX+1];
1402
1403 if (fsok == -1) fsok= r_super(&block_size) != 0;
1404 if (!fsok) return;
1405
1406 /* (,) construct because r_stat returns void */
1407 if ((ino= r_lookup(ROOT_INO, dir)) == 0 ||
1408 (r_stat(ino, &st), r_readdir(name)) == -1)
1409 {
1410 printf("ls: %s: %s\n", dir, unix_err(errno));
1411 return;
1412 }
1413 (void) r_readdir(name); /* Skip ".." too. */
1414
1415 while ((ino= r_readdir(name)) != 0) printf("%s/%s\n", dir, name);
1416}
1417
1418u32_t milli_time(void)
1419{
1420 return get_tick() * MSEC_PER_TICK;
1421}
1422
1423u32_t milli_since(u32_t base)
1424{
1425 return (milli_time() + (TICKS_PER_DAY*MSEC_PER_TICK) - base)
1426 % (TICKS_PER_DAY*MSEC_PER_TICK);
1427}
1428
1429char *Thandler;
1430u32_t Tbase, Tcount;
1431
1432void unschedule(void)
1433/* Invalidate a waiting command. */
1434{
1435 alarm(0);
1436
1437 if (Thandler != nil) {
1438 free(Thandler);
1439 Thandler= nil;
1440 }
1441}
1442
1443void schedule(long msec, char *cmd)
1444/* Schedule command at a certain time from now. */
1445{
1446 unschedule();
1447 Thandler= cmd;
1448 Tbase= milli_time();
1449 Tcount= msec;
1450 alarm(1);
1451}
1452
1453int expired(void)
1454/* Check if the timer expired for getch(). */
1455{
1456 return (Thandler != nil && milli_since(Tbase) >= Tcount);
1457}
1458
1459void delay(char *msec)
1460/* Delay for a given time. */
1461{
1462 u32_t base, count;
1463
1464 if ((count= a2l(msec)) == 0) return;
1465 base= milli_time();
1466
1467 alarm(1);
1468
1469 do {
1470 pause();
1471 } while (!interrupt() && !expired() && milli_since(base) < count);
1472}
1473
1474enum whatfun { NOFUN, SELECT, DEFFUN, USERFUN } menufun(environment *e)
1475{
1476 if (!(e->flags & E_FUNCTION) || e->arg[0] == 0) return NOFUN;
1477 if (e->arg[1] != ',') return SELECT;
1478 return e->flags & E_RESERVED ? DEFFUN : USERFUN;
1479}
1480
1481void menu(void)
1482/* By default: Show a simple menu.
1483 * Multiple kernels/images: Show extra selection options.
1484 * User defined function: Kill the defaults and show these.
1485 * Wait for a keypress and execute the given function.
1486 */
1487{
1488 int c, def= 1;
1489 char *choice= nil;
1490 environment *e;
1491
1492 /* Just a default menu? */
1493 for (e= env; e != nil; e= e->next) if (menufun(e) == USERFUN) def= 0;
1494
1495 printf("\nHit a key as follows:\n\n");
1496
1497 /* Show the choices. */
1498 for (e= env; e != nil; e= e->next) {
1499 switch (menufun(e)) {
1500 case DEFFUN:
1501 if (!def) break;
1502 /*FALL THROUGH*/
1503 case USERFUN:
1504 printf(" %c %s\n", e->arg[0], e->arg+2);
1505 break;
1506 case SELECT:
1507 printf(" %c Select %s kernel\n", e->arg[0],e->name);
1508 break;
1509 default:;
1510 }
1511 }
1512
1513 /* Wait for a keypress. */
1514 do {
1515 c= getch();
1516 if (interrupt() || expired()) return;
1517
1518 unschedule();
1519
1520 for (e= env; e != nil; e= e->next) {
1521 switch (menufun(e)) {
1522 case DEFFUN:
1523 if (!def) break;
1524 case USERFUN:
1525 case SELECT:
1526 if (c == e->arg[0]) choice= e->value;
1527 }
1528 }
1529 } while (choice == nil);
1530
1531 /* Execute the chosen function. */
1532 printf("%c\n", c);
1533 (void) tokenize(&cmds, choice);
1534}
1535
1536void help(void)
1537/* Not everyone is a rocket scientist. */
1538{
1539 struct help {
1540 char *thing;
1541 char *help;
1542 } *pi;
1543 static struct help info[] = {
1544 { nil, "Names:" },
1545 { "rootdev", "Root device" },
1546 { "ramimagedev", "Device to use as RAM disk image " },
1547 { "ramsize", "RAM disk size (if no image device) " },
1548 { "bootdev", "Special name for the boot device" },
1549 { "fd0, d0p2, c0d0p1s0", "Devices (as in /dev)" },
1550 { "image", "Name of the boot image to use" },
1551 { "main", "Startup function" },
1552 { "bootdelay", "Delay in msec after loading image" },
1553 { nil, "Commands:" },
1554 { "name = [device] value", "Set environment variable" },
1555 { "name() { ... }", "Define function" },
1556 { "name(key,text) { ... }",
1557 "A menu option like: minix(=,Start MINIX) {boot}" },
1558 { "name", "Call function" },
1559 { "boot [device]", "Boot Minix or another O.S." },
1560 { "ctty [line]", "Duplicate to serial line" },
1561 { "delay [msec]", "Delay (500 msec default)" },
1562 { "echo word ...", "Display the words" },
1563 { "ls [directory]", "List contents of directory" },
1564 { "menu", "Show menu and choose menu option" },
1565 { "save / set", "Save or show environment" },
1566 { "trap msec command", "Schedule command " },
1567 { "unset name ...", "Unset variable or set to default" },
1568 { "exit / off", "Exit the Monitor / Power off" },
1569 };
1570
1571 for (pi= info; pi < arraylimit(info); pi++) {
1572 if (pi->thing != nil) printf(" %-24s- ", pi->thing);
1573 printf("%s\n", pi->help);
1574 }
1575}
1576
1577void execute(void)
1578/* Get one command from the command chain and execute it. */
1579{
1580 token *second, *third, *fourth, *sep;
1581 char *name;
1582 int res;
1583 size_t n= 0;
1584
1585 if (err) {
1586 /* An error occured, stop interpreting. */
1587 while (cmds != nil) voidtoken();
1588 return;
1589 }
1590
1591 if (expired()) { /* Timer expired? */
1592 parse_code(Thandler);
1593 unschedule();
1594 }
1595
1596 /* There must be a separator lurking somewhere. */
1597 for (sep= cmds; sep != nil && sep->token[0] != ';'; sep= sep->next) n++;
1598
1599 name= cmds->token;
1600 res= reserved(name);
1601 if ((second= cmds->next) != nil
1602 && (third= second->next) != nil)
1603 fourth= third->next;
1604
1605 /* Null command? */
1606 if (n == 0) {
1607 voidtoken();
1608 return;
1609 } else
1610 /* name = [device] value? */
1611 if ((n == 3 || n == 4)
1612 && !sugar(name)
1613 && second->token[0] == '='
1614 && !sugar(third->token)
1615 && (n == 3 || (n == 4 && third->token[0] == 'd'
1616 && !sugar(fourth->token)
1617 ))) {
1618 char *value= third->token;
1619 int flags= E_VAR;
1620
1621 if (n == 4) { value= fourth->token; flags|= E_DEV; }
1622
1623 if ((flags= b_setvar(flags, name, value)) != 0) {
1624 printf("%s is a %s\n", name,
1625 flags & E_RESERVED ? "reserved word" :
1626 "special function");
1627 err= 1;
1628 }
1629 while (cmds != sep) voidtoken();
1630 return;
1631 } else
1632 /* name '(arg)' ... ? */
1633 if (n >= 3
1634 && !sugar(name)
1635 && second->token[0] == '('
1636 ) {
1637 token *fun;
1638 int c, flags, depth;
1639 char *body;
1640 size_t len;
1641
1642 sep= fun= third;
1643 depth= 0;
1644 len= 1;
1645 while (sep != nil) {
1646 if ((c= sep->token[0]) == ';' && depth == 0) break;
1647 len+= strlen(sep->token) + 1;
1648 sep= sep->next;
1649 if (c == '{') depth++;
1650 if (c == '}' && --depth == 0) break;
1651 }
1652
1653 body= malloc(len * sizeof(char));
1654 *body= 0;
1655
1656 while (fun != sep) {
1657 strcat(body, fun->token);
1658 if (!sugar(fun->token)
1659 && !sugar(fun->next->token)
1660 ) strcat(body, " ");
1661 fun= fun->next;
1662 }
1663 second->token[strlen(second->token)-1]= 0;
1664
1665 if (depth != 0) {
1666 printf("Missing '}'\n");
1667 err= 1;
1668 } else
1669 if ((flags= b_setenv(E_FUNCTION, name,
1670 second->token+1, body)) != 0) {
1671 printf("%s is a %s\n", name,
1672 flags & E_RESERVED ? "reserved word" :
1673 "special variable");
1674 err= 1;
1675 }
1676 while (cmds != sep) voidtoken();
1677 free(body);
1678 return;
1679 } else
1680 /* Grouping? */
1681 if (name[0] == '{') {
1682 token **acmds= &cmds->next;
1683 char *t;
1684 int depth= 1;
1685
1686 /* Find and remove matching '}' */
1687 depth= 1;
1688 while (*acmds != nil) {
1689 t= (*acmds)->token;
1690 if (t[0] == '{') depth++;
1691 if (t[0] == '}' && --depth == 0) { t[0]= ';'; break; }
1692 acmds= &(*acmds)->next;
1693 }
1694 voidtoken();
1695 return;
1696 } else
1697 /* Command coming up, check if ESC typed. */
1698 if (interrupt()) {
1699 return;
1700 } else
1701 /* unset name ..., echo word ...? */
1702 if (n >= 1 && (res == R_UNSET || res == R_ECHO)) {
1703 char *arg= poptoken(), *p;
1704
1705 for (;;) {
1706 free(arg);
1707 if (cmds == sep) break;
1708 arg= poptoken();
1709 if (res == R_UNSET) { /* unset arg */
1710 b_unset(arg);
1711 } else { /* echo arg */
1712 p= arg;
1713 while (*p != 0) {
1714 if (*p != '\\') {
1715 putch(*p);
1716 } else
1717 switch (*++p) {
1718 case 0:
1719 if (cmds == sep) return;
1720 continue;
1721 case 'n':
1722 putch('\n');
1723 break;
1724 case 'v':
1725 printf(version);
1726 break;
1727 case 'c':
1728 clear_screen();
1729 break;
1730 case 'w':
1731 for (;;) {
1732 if (interrupt())
1733 return;
1734 if (getch() == '\n')
1735 break;
1736 }
1737 break;
1738 default:
1739 putch(*p);
1740 }
1741 p++;
1742 }
1743 putch(cmds != sep ? ' ' : '\n');
1744 }
1745 }
1746 return;
1747 } else
1748 /* boot -opts? */
1749 if (n == 2 && res == R_BOOT && second->token[0] == '-') {
1750 static char optsvar[]= "bootopts";
1751 (void) b_setvar(E_VAR, optsvar, second->token);
1752 voidtoken();
1753 voidtoken();
1754 bootminix();
1755 b_unset(optsvar);
1756 return;
1757 } else
1758 /* boot device, ls dir, delay msec? */
1759 if (n == 2 && (res == R_BOOT || res == R_CTTY
1760 || res == R_DELAY || res == R_LS)
1761 ) {
1762 if (res == R_BOOT) boot_device(second->token);
1763 if (res == R_CTTY) ctty(second->token);
1764 if (res == R_DELAY) delay(second->token);
1765 if (res == R_LS) ls(second->token);
1766 voidtoken();
1767 voidtoken();
1768 return;
1769 } else
1770 /* trap msec command? */
1771 if (n == 3 && res == R_TRAP && numeric(second->token)) {
1772 long msec= a2l(second->token);
1773
1774 voidtoken();
1775 voidtoken();
1776 schedule(msec, poptoken());
1777 return;
1778 } else
1779 /* Simple command. */
1780 if (n == 1) {
1781 char *body;
1782 int ok= 0;
1783
1784 name= poptoken();
1785
1786 switch (res) {
1787 case R_BOOT: bootminix(); ok= 1; break;
1788 case R_DELAY: delay("500"); ok= 1; break;
1789 case R_LS: ls(null); ok= 1; break;
1790 case R_MENU: menu(); ok= 1; break;
1791 case R_SAVE: save_parameters(); ok= 1;break;
1792 case R_SET: show_env(); ok= 1; break;
1793 case R_HELP: help(); ok= 1; break;
1794 case R_EXIT: exit(0);
1795 case R_OFF: off(); ok= 1; break;
1796 }
1797
1798 /* Command to check bootparams: */
1799 if (strcmp(name, ":") == 0) ok= 1;
1800
1801 /* User defined function. */
1802 if (!ok && (body= b_body(name)) != nil) {
1803 (void) tokenize(&cmds, body);
1804 ok= 1;
1805 }
1806 if (!ok) printf("%s: unknown function", name);
1807 free(name);
1808 if (ok) return;
1809 } else {
1810 /* Syntax error. */
1811 printf("Can't parse:");
1812 while (cmds != sep) {
1813 printf(" %s", cmds->token); voidtoken();
1814 }
1815 }
1816
1817 /* Getting here means that the command is not understood. */
1818 printf("\nTry 'help'\n");
1819 err= 1;
1820}
1821
1822int run_trailer(void)
1823/* Run the trailer function between loading Minix and handing control to it.
1824 * Return true iff there was no error.
1825 */
1826{
1827 token *save_cmds= cmds;
1828
1829 cmds= nil;
1830 (void) tokenize(&cmds, "trailer");
1831 while (cmds != nil) execute();
1832 cmds= save_cmds;
1833 return !err;
1834}
1835
1836void monitor(void)
1837/* Read a line and tokenize it. */
1838{
1839 char *line;
1840
1841 unschedule(); /* Kill a trap. */
1842 err= 0; /* Clear error state. */
1843
1844 if (istty) printf("%s>", bootdev.name);
1845 line= readline();
1846 (void) tokenize(&cmds, line);
1847 free(line);
1848 (void) escape(); /* Forget if ESC typed. */
1849}
1850
1851#if BIOS
1852
1853unsigned char cdspec[25];
1854void bootcdinfo(u32_t, int *, int drive);
1855
1856void boot(void)
1857/* Load Minix and start it, among other things. */
1858{
1859
1860 /* Initialize tables. */
1861 initialize();
1862
1863 /* Get environment variables from the parameter sector. */
1864 get_parameters();
1865
1866 while (1) {
1867 /* While there are commands, execute them! */
1868
1869 while (cmds != nil) execute();
1870
1871 /* The "monitor" is just a "read one command" thing. */
1872 monitor();
1873 }
1874}
1875#endif /* BIOS */
1876
1877#if UNIX
1878
1879void main(int argc, char **argv)
1880/* Do not load or start anything, just edit parameters. */
1881{
1882 int i;
1883 char bootcode[SECTOR_SIZE];
1884 struct termios rawterm;
1885
1886 istty= (argc <= 2 && tcgetattr(0, &termbuf) == 0);
1887
1888 if (argc < 2) {
1889 fprintf(stderr, "Usage: edparams device [command ...]\n");
1890 exit(1);
1891 }
1892
1893 /* Go over the arguments, changing control characters to spaces. */
1894 for (i= 2; i < argc; i++) {
1895 char *p;
1896
1897 for (p= argv[i]; *p != 0; p++) {
1898 if ((unsigned) *p < ' ' && *p != '\n') *p= ' ';
1899 }
1900 }
1901
1902 bootdev.name= argv[1];
1903 if (strncmp(bootdev.name, "/dev/", 5) == 0) bootdev.name+= 5;
1904 if ((bootdev.device= open(argv[1], O_RDWR, 0666)) < 0)
1905 fatal(bootdev.name);
1906
1907 /* Check if it is a bootable Minix device. */
1908 if (readsectors(mon2abs(bootcode), lowsec, 1) != 0
1909 || memcmp(bootcode, boot_magic, sizeof(boot_magic)) != 0) {
1910 fprintf(stderr, "edparams: %s: not a bootable Minix device\n",
1911 bootdev.name);
1912 exit(1);
1913 }
1914
1915 /* Print greeting message. */
1916 if (istty) printf("Boot parameters editor.\n");
1917
1918 signal(SIGINT, trap);
1919 signal(SIGALRM, trap);
1920
1921 if (istty) {
1922 rawterm= termbuf;
1923 rawterm.c_lflag&= ~(ICANON|ECHO|IEXTEN);
1924 rawterm.c_cc[VINTR]= ESC;
1925 if (tcsetattr(0, TCSANOW, &rawterm) < 0) fatal("");
1926 }
1927
1928 /* Get environment variables from the parameter sector. */
1929 get_parameters();
1930
1931 i= 2;
1932 for (;;) {
1933 /* While there are commands, execute them! */
1934 while (cmds != nil || i < argc) {
1935 if (cmds == nil) {
1936 /* A command line command. */
1937 parse_code(argv[i++]);
1938 }
1939 execute();
1940
1941 /* Bail out on errors if not interactive. */
1942 if (err && !istty) exit(1);
1943 }
1944
1945 /* Commands on the command line? */
1946 if (argc > 2) break;
1947
1948 /* The "monitor" is just a "read one command" thing. */
1949 monitor();
1950 }
1951 exit(0);
1952}
1953#endif /* UNIX */
1954
1955/*
1956 * $PchId: boot.c,v 1.14 2002/02/27 19:46:14 philip Exp $
1957 */
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