arch/ppc64/boot/start.c

   1 /*
   2  * Copyright (C) Paul Mackerras 1997.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9 #include <stdarg.h>
  10 #include <linux/types.h>
  11 #include <linux/string.h>
  12 #include <linux/ctype.h>
  13
  14 #include <asm/div64.h>
  15
  16 int (*prom)(void *);
  17
  18 void *chosen_handle;
  19 void *stdin;
  20 void *stdout;
  21 void *stderr;
  22
  23 void exit(void);
  24 void *finddevice(const char *name);
  25 int getprop(void *phandle, const char *name, void *buf, int buflen);
  26 void chrpboot(int a1, int a2, void *prom);      /* in main.c */
  27
  28 void printk(char *fmt, ...);
  29
  30 void
  31 start(int a1, int a2, void *promptr)
  32 {
  33         prom = (int (*)(void *)) promptr;
  34         chosen_handle = finddevice("/chosen");
  35         if (chosen_handle == (void *) -1)
  36                 exit();
  37         if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
  38                 exit();
  39         stderr = stdout;
  40         if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
  41         exit();
  42
  43         chrpboot(a1, a2, promptr);
  44         for (;;)
  45                 exit();
  46 }
  47
  48 int
  49 write(void *handle, void *ptr, int nb)
  50 {
  51         struct prom_args {
  52                 char *service;
  53                 int nargs;
  54                 int nret;
  55                 void *ihandle;
  56                 void *addr;
  57                 int len;
  58                 int actual;
  59         } args;
  60
  61         args.service = "write";
  62         args.nargs = 3;
  63         args.nret = 1;
  64         args.ihandle = handle;
  65         args.addr = ptr;
  66         args.len = nb;
  67         args.actual = -1;
  68         (*prom)(&args);
  69         return args.actual;
  70 }
  71
  72 int
  73 read(void *handle, void *ptr, int nb)
  74 {
  75         struct prom_args {
  76                 char *service;
  77                 int nargs;
  78                 int nret;
  79                 void *ihandle;
  80                 void *addr;
  81                 int len;
  82                 int actual;
  83         } args;
  84
  85         args.service = "read";
  86         args.nargs = 3;
  87         args.nret = 1;
  88         args.ihandle = handle;
  89         args.addr = ptr;
  90         args.len = nb;
  91         args.actual = -1;
  92         (*prom)(&args);
  93         return args.actual;
  94 }
  95
  96 void
  97 exit()
  98 {
  99         struct prom_args {
 100                 char *service;
 101         } args;
 102
 103         for (;;) {
 104                 args.service = "exit";
 105                 (*prom)(&args);
 106         }
 107 }
 108
 109 void
 110 pause(void)
 111 {
 112         struct prom_args {
 113                 char *service;
 114         } args;
 115
 116         args.service = "enter";
 117         (*prom)(&args);
 118 }
 119
 120 void *
 121 finddevice(const char *name)
 122 {
 123         struct prom_args {
 124                 char *service;
 125                 int nargs;
 126                 int nret;
 127                 const char *devspec;
 128                 void *phandle;
 129         } args;
 130
 131         args.service = "finddevice";
 132         args.nargs = 1;
 133         args.nret = 1;
 134         args.devspec = name;
 135         args.phandle = (void *) -1;
 136         (*prom)(&args);
 137         return args.phandle;
 138 }
 139
 140 void *
 141 claim(unsigned long virt, unsigned long size, unsigned long align)
 142 {
 143         struct prom_args {
 144                 char *service;
 145                 int nargs;
 146                 int nret;
 147                 unsigned int virt;
 148                 unsigned int size;
 149                 unsigned int align;
 150                 void *ret;
 151         } args;
 152
 153         args.service = "claim";
 154         args.nargs = 3;
 155         args.nret = 1;
 156         args.virt = virt;
 157         args.size = size;
 158         args.align = align;
 159         (*prom)(&args);
 160         return args.ret;
 161 }
 162
 163 int
 164 getprop(void *phandle, const char *name, void *buf, int buflen)
 165 {
 166         struct prom_args {
 167                 char *service;
 168                 int nargs;
 169                 int nret;
 170                 void *phandle;
 171                 const char *name;
 172                 void *buf;
 173                 int buflen;
 174                 int size;
 175         } args;
 176
 177         args.service = "getprop";
 178         args.nargs = 4;
 179         args.nret = 1;
 180         args.phandle = phandle;
 181         args.name = name;
 182         args.buf = buf;
 183         args.buflen = buflen;
 184         args.size = -1;
 185         (*prom)(&args);
 186         return args.size;
 187 }
 188
 189 int
 190 putc(int c, void *f)
 191 {
 192         char ch = c;
 193
 194         if (c == '\n')
 195                 putc('\r', f);
 196         return write(f, &ch, 1) == 1? c: -1;
 197 }
 198
 199 int
 200 putchar(int c)
 201 {
 202         return putc(c, stdout);
 203 }
 204
 205 int
 206 fputs(char *str, void *f)
 207 {
 208         int n = strlen(str);
 209
 210         return write(f, str, n) == n? 0: -1;
 211 }
 212
 213 int
 214 readchar(void)
 215 {
 216         char ch;
 217
 218         for (;;) {
 219                 switch (read(stdin, &ch, 1)) {
 220                 case 1:
 221                         return ch;
 222                 case -1:
 223                         printk("read(stdin) returned -1\r\n");
 224                         return -1;
 225                 }
 226         }
 227 }
 228
 229 static char line[256];
 230 static char *lineptr;
 231 static int lineleft;
 232
 233 int
 234 getchar(void)
 235 {
 236         int c;
 237
 238         if (lineleft == 0) {
 239                 lineptr = line;
 240                 for (;;) {
 241                         c = readchar();
 242                         if (c == -1 || c == 4)
 243                                 break;
 244                         if (c == '\r' || c == '\n') {
 245                                 *lineptr++ = '\n';
 246                                 putchar('\n');
 247                                 break;
 248                         }
 249                         switch (c) {
 250                         case 0177:
 251                         case '\b':
 252                                 if (lineptr > line) {
 253                                         putchar('\b');
 254                                         putchar(' ');
 255                                         putchar('\b');
 256                                         --lineptr;
 257                                 }
 258                                 break;
 259                         case 'U' & 0x1F:
 260                                 while (lineptr > line) {
 261                                         putchar('\b');
 262                                         putchar(' ');
 263                                         putchar('\b');
 264                                         --lineptr;
 265                                 }
 266                                 break;
 267                         default:
 268                                 if (lineptr >= &line[sizeof(line) - 1])
 269                                         putchar('\a');
 270                                 else {
 271                                         putchar(c);
 272                                         *lineptr++ = c;
 273                                 }
 274                         }
 275                 }
 276                 lineleft = lineptr - line;
 277                 lineptr = line;
 278         }
 279         if (lineleft == 0)
 280                 return -1;
 281         --lineleft;
 282         return *lineptr++;
 283 }
 284
 285
 286
 287 /* String functions lifted from lib/vsprintf.c and lib/ctype.c */
 288 unsigned char _ctype[] = {
 289 _C,_C,_C,_C,_C,_C,_C,_C,                        /* 0-7 */
 290 _C,_C|_S,_C|_S,_C|_S,_C|_S,_C|_S,_C,_C,         /* 8-15 */
 291 _C,_C,_C,_C,_C,_C,_C,_C,                        /* 16-23 */
 292 _C,_C,_C,_C,_C,_C,_C,_C,                        /* 24-31 */
 293 _S|_SP,_P,_P,_P,_P,_P,_P,_P,                    /* 32-39 */
 294 _P,_P,_P,_P,_P,_P,_P,_P,                        /* 40-47 */
 295 _D,_D,_D,_D,_D,_D,_D,_D,                        /* 48-55 */
 296 _D,_D,_P,_P,_P,_P,_P,_P,                        /* 56-63 */
 297 _P,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U,      /* 64-71 */
 298 _U,_U,_U,_U,_U,_U,_U,_U,                        /* 72-79 */
 299 _U,_U,_U,_U,_U,_U,_U,_U,                        /* 80-87 */
 300 _U,_U,_U,_P,_P,_P,_P,_P,                        /* 88-95 */
 301 _P,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L,      /* 96-103 */
 302 _L,_L,_L,_L,_L,_L,_L,_L,                        /* 104-111 */
 303 _L,_L,_L,_L,_L,_L,_L,_L,                        /* 112-119 */
 304 _L,_L,_L,_P,_P,_P,_P,_C,                        /* 120-127 */
 305 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,                /* 128-143 */
 306 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,                /* 144-159 */
 307 _S|_SP,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,   /* 160-175 */
 308 _P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,       /* 176-191 */
 309 _U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,       /* 192-207 */
 310 _U,_U,_U,_U,_U,_U,_U,_P,_U,_U,_U,_U,_U,_U,_U,_L,       /* 208-223 */
 311 _L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,       /* 224-239 */
 312 _L,_L,_L,_L,_L,_L,_L,_P,_L,_L,_L,_L,_L,_L,_L,_L};      /* 240-255 */
 313
 314 size_t strnlen(const char * s, size_t count)
 315 {
 316         const char *sc;
 317
 318         for (sc = s; count-- && *sc != '\0'; ++sc)
 319                 /* nothing */;
 320         return sc - s;
 321 }
 322
 323 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
 324 {
 325         unsigned long result = 0,value;
 326
 327         if (!base) {
 328                 base = 10;
 329                 if (*cp == '0') {
 330                         base = 8;
 331                         cp++;
 332                         if ((*cp == 'x') && isxdigit(cp[1])) {
 333                                 cp++;
 334                                 base = 16;
 335                         }
 336                 }
 337         }
 338         while (isxdigit(*cp) &&
 339                (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
 340                 result = result*base + value;
 341                 cp++;
 342         }
 343         if (endp)
 344                 *endp = (char *)cp;
 345         return result;
 346 }
 347
 348 long simple_strtol(const char *cp,char **endp,unsigned int base)
 349 {
 350         if(*cp=='-')
 351                 return -simple_strtoul(cp+1,endp,base);
 352         return simple_strtoul(cp,endp,base);
 353 }
 354
 355 static int skip_atoi(const char **s)
 356 {
 357         int i=0;
 358
 359         while (isdigit(**s))
 360                 i = i*10 + *((*s)++) - '0';
 361         return i;
 362 }
 363
 364 #define ZEROPAD 1               /* pad with zero */
 365 #define SIGN    2               /* unsigned/signed long */
 366 #define PLUS    4               /* show plus */
 367 #define SPACE   8               /* space if plus */
 368 #define LEFT    16              /* left justified */
 369 #define SPECIAL 32              /* 0x */
 370 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
 371
 372 static char * number(char * str, long long num, int base, int size, int precision, int type)
 373 {
 374         char c,sign,tmp[66];
 375         const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
 376         int i;
 377
 378         if (type & LARGE)
 379                 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 380         if (type & LEFT)
 381                 type &= ~ZEROPAD;
 382         if (base < 2 || base > 36)
 383                 return 0;
 384         c = (type & ZEROPAD) ? '0' : ' ';
 385         sign = 0;
 386         if (type & SIGN) {
 387                 if (num < 0) {
 388                         sign = '-';
 389                         num = -num;
 390                         size--;
 391                 } else if (type & PLUS) {
 392                         sign = '+';
 393                         size--;
 394                 } else if (type & SPACE) {
 395                         sign = ' ';
 396                         size--;
 397                 }
 398         }
 399         if (type & SPECIAL) {
 400                 if (base == 16)
 401                         size -= 2;
 402                 else if (base == 8)
 403                         size--;
 404         }
 405         i = 0;
 406         if (num == 0)
 407                 tmp[i++]='0';
 408         else while (num != 0)
 409                 tmp[i++] = digits[do_div(num,base)];
 410         if (i > precision)
 411                 precision = i;
 412         size -= precision;
 413         if (!(type&(ZEROPAD+LEFT)))
 414                 while(size-->0)
 415                         *str++ = ' ';
 416         if (sign)
 417                 *str++ = sign;
 418         if (type & SPECIAL) {
 419                 if (base==8)
 420                         *str++ = '0';
 421                 else if (base==16) {
 422                         *str++ = '0';
 423                         *str++ = digits[33];
 424                 }
 425         }
 426         if (!(type & LEFT))
 427                 while (size-- > 0)
 428                         *str++ = c;
 429         while (i < precision--)
 430                 *str++ = '0';
 431         while (i-- > 0)
 432                 *str++ = tmp[i];
 433         while (size-- > 0)
 434                 *str++ = ' ';
 435         return str;
 436 }
 437
 438 /* Forward decl. needed for IP address printing stuff... */
 439 int sprintf(char * buf, const char *fmt, ...);
 440
 441 int vsprintf(char *buf, const char *fmt, va_list args)
 442 {
 443         int len;
 444         unsigned long long num;
 445         int i, base;
 446         char * str;
 447         const char *s;
 448
 449         int flags;              /* flags to number() */
 450
 451         int field_width;        /* width of output field */
 452         int precision;          /* min. # of digits for integers; max
 453                                    number of chars for from string */
 454         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 455                                 /* 'z' support added 23/7/1999 S.H.    */
 456                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 457
 458
 459         for (str=buf ; *fmt ; ++fmt) {
 460                 if (*fmt != '%') {
 461                         *str++ = *fmt;
 462                         continue;
 463                 }
 464
 465                 /* process flags */
 466                 flags = 0;
 467                 repeat:
 468                         ++fmt;          /* this also skips first '%' */
 469                         switch (*fmt) {
 470                                 case '-': flags |= LEFT; goto repeat;
 471                                 case '+': flags |= PLUS; goto repeat;
 472                                 case ' ': flags |= SPACE; goto repeat;
 473                                 case '#': flags |= SPECIAL; goto repeat;
 474                                 case '0': flags |= ZEROPAD; goto repeat;
 475                                 }
 476
 477                 /* get field width */
 478                 field_width = -1;
 479                 if (isdigit(*fmt))
 480                         field_width = skip_atoi(&fmt);
 481                 else if (*fmt == '*') {
 482                         ++fmt;
 483                         /* it's the next argument */
 484                         field_width = va_arg(args, int);
 485                         if (field_width < 0) {
 486                                 field_width = -field_width;
 487                                 flags |= LEFT;
 488                         }
 489                 }
 490
 491                 /* get the precision */
 492                 precision = -1;
 493                 if (*fmt == '.') {
 494                         ++fmt;
 495                         if (isdigit(*fmt))
 496                                 precision = skip_atoi(&fmt);
 497                         else if (*fmt == '*') {
 498                                 ++fmt;
 499                                 /* it's the next argument */
 500                                 precision = va_arg(args, int);
 501                         }
 502                         if (precision < 0)
 503                                 precision = 0;
 504                 }
 505
 506                 /* get the conversion qualifier */
 507                 qualifier = -1;
 508                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt =='Z') {
 509                         qualifier = *fmt;
 510                         ++fmt;
 511                 }
 512
 513                 /* default base */
 514                 base = 10;
 515
 516                 switch (*fmt) {
 517                 case 'c':
 518                         if (!(flags & LEFT))
 519                                 while (--field_width > 0)
 520                                         *str++ = ' ';
 521                         *str++ = (unsigned char) va_arg(args, int);
 522                         while (--field_width > 0)
 523                                 *str++ = ' ';
 524                         continue;
 525
 526                 case 's':
 527                         s = va_arg(args, char *);
 528                         if (!s)
 529                                 s = "<NULL>";
 530
 531                         len = strnlen(s, precision);
 532
 533                         if (!(flags & LEFT))
 534                                 while (len < field_width--)
 535                                         *str++ = ' ';
 536                         for (i = 0; i < len; ++i)
 537                                 *str++ = *s++;
 538                         while (len < field_width--)
 539                                 *str++ = ' ';
 540                         continue;
 541
 542                 case 'p':
 543                         if (field_width == -1) {
 544                                 field_width = 2*sizeof(void *);
 545                                 flags |= ZEROPAD;
 546                         }
 547                         str = number(str,
 548                                 (unsigned long) va_arg(args, void *), 16,
 549                                 field_width, precision, flags);
 550                         continue;
 551
 552
 553                 case 'n':
 554                         if (qualifier == 'l') {
 555                                 long * ip = va_arg(args, long *);
 556                                 *ip = (str - buf);
 557                         } else if (qualifier == 'Z') {
 558                                 size_t * ip = va_arg(args, size_t *);
 559                                 *ip = (str - buf);
 560                         } else {
 561                                 int * ip = va_arg(args, int *);
 562                                 *ip = (str - buf);
 563                         }
 564                         continue;
 565
 566                 case '%':
 567                         *str++ = '%';
 568                         continue;
 569
 570                 /* integer number formats - set up the flags and "break" */
 571                 case 'o':
 572                         base = 8;
 573                         break;
 574
 575                 case 'X':
 576                         flags |= LARGE;
 577                 case 'x':
 578                         base = 16;
 579                         break;
 580
 581                 case 'd':
 582                 case 'i':
 583                         flags |= SIGN;
 584                 case 'u':
 585                         break;
 586
 587                 default:
 588                         *str++ = '%';
 589                         if (*fmt)
 590                                 *str++ = *fmt;
 591                         else
 592                                 --fmt;
 593                         continue;
 594                 }
 595                 if (qualifier == 'L')
 596                         num = va_arg(args, long long);
 597                 else if (qualifier == 'l') {
 598                         num = va_arg(args, unsigned long);
 599                         if (flags & SIGN)
 600                                 num = (signed long) num;
 601                 } else if (qualifier == 'Z') {
 602                         num = va_arg(args, size_t);
 603                 } else if (qualifier == 'h') {
 604                         num = (unsigned short) va_arg(args, int);
 605                         if (flags & SIGN)
 606                                 num = (signed short) num;
 607                 } else {
 608                         num = va_arg(args, unsigned int);
 609                         if (flags & SIGN)
 610                                 num = (signed int) num;
 611                 }
 612                 str = number(str, num, base, field_width, precision, flags);
 613         }
 614         *str = '\0';
 615         return str-buf;
 616 }
 617
 618 int sprintf(char * buf, const char *fmt, ...)
 619 {
 620         va_list args;
 621         int i;
 622
 623         va_start(args, fmt);
 624         i=vsprintf(buf,fmt,args);
 625         va_end(args);
 626         return i;
 627 }
 628
 629 static char sprint_buf[1024];
 630
 631 void
 632 printk(char *fmt, ...)
 633 {
 634         va_list args;
 635         int n;
 636
 637         va_start(args, fmt);
 638         n = vsprintf(sprint_buf, fmt, args);
 639         va_end(args);
 640         write(stdout, sprint_buf, n);
 641 }
 642
 643 int
 644 printf(char *fmt, ...)
 645 {
 646         va_list args;
 647         int n;
 648
 649         va_start(args, fmt);
 650         n = vsprintf(sprint_buf, fmt, args);
 651         va_end(args);
 652         write(stdout, sprint_buf, n);
 653         return n;
 654 }