pexpert/gen/bootargs.c

   1 /*
   2  * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <pexpert/pexpert.h>
  29 #include <pexpert/device_tree.h>
  30
  31 static boolean_t isargsep( char c);
  32 #if !CONFIG_EMBEDDED
  33 static int argstrcpy(char *from, char *to);
  34 #endif
  35 static int argstrcpy2(char *from,char *to, unsigned maxlen);
  36 static int argnumcpy(int val, void *to, unsigned maxlen);
  37 static int getval(char *s, int *val);
  38
  39 extern int IODTGetDefault(const char *key, void *infoAddr, unsigned int infoSize);
  40
  41 struct i24 {
  42         int32_t i24 : 24;
  43         int32_t _pad : 8;
  44 };
  45
  46 #define NUM     0
  47 #define STR     1
  48
  49 #if !defined(__LP64__) && !defined(__arm__)
  50 boolean_t
  51 PE_parse_boot_arg(
  52         const char  *arg_string,
  53         void            *arg_ptr)
  54 {
  55         int max_len = -1;
  56
  57 #if CONFIG_EMBEDDED
  58         /* Limit arg size to 4 byte when no size is given */
  59         max_len = 4;
  60 #endif
  61
  62         return PE_parse_boot_argn(arg_string, arg_ptr, max_len);
  63 }
  64 #endif
  65
  66 boolean_t
  67 PE_parse_boot_argn(
  68         const char      *arg_string,
  69         void            *arg_ptr,
  70         int                     max_len)
  71 {
  72         char *args;
  73         char *cp, c;
  74         unsigned int i;
  75         int val;
  76         boolean_t arg_boolean;
  77         boolean_t arg_found;
  78
  79         args = PE_boot_args();
  80         if (*args == '\0') return FALSE;
  81
  82 #if CONFIG_EMBEDDED
  83         if (max_len == -1) return FALSE;
  84 #endif
  85
  86         arg_found = FALSE;
  87
  88         while(*args && isargsep(*args)) args++;
  89
  90         while (*args)
  91         {
  92                 if (*args == '-')
  93                         arg_boolean = TRUE;
  94                 else
  95                         arg_boolean = FALSE;
  96
  97                 cp = args;
  98                 while (!isargsep (*cp) && *cp != '=')
  99                         cp++;
 100                 if (*cp != '=' && !arg_boolean)
 101                         goto gotit;
 102
 103                 c = *cp;
 104
 105                 i = cp-args;
 106                 if (strncmp(args, arg_string, i) ||
 107                     (i!=strlen(arg_string)))
 108                         goto gotit;
 109                 if (arg_boolean) {
 110                         argnumcpy(1, arg_ptr, max_len);
 111                         arg_found = TRUE;
 112                         break;
 113                 } else {
 114                         while (*cp && isargsep (*cp))
 115                                 cp++;
 116                         if (*cp == '=' && c != '=') {
 117                                 args = cp+1;
 118                                 goto gotit;
 119                         }
 120                         if ('_' == *arg_string) /* Force a string copy if the argument name begins with an underscore */
 121                         {
 122                                 int hacklen = 17 > max_len ? 17 : max_len;
 123                                 argstrcpy2 (++cp, (char *)arg_ptr, hacklen - 1); /* Hack - terminate after 16 characters */
 124                                 arg_found = TRUE;
 125                                 break;
 126                         }
 127                         switch (getval(cp, &val))
 128                         {
 129                                 case NUM:
 130                                         argnumcpy(val, arg_ptr, max_len);
 131                                         arg_found = TRUE;
 132                                         break;
 133                                 case STR:
 134                                         if(max_len > 0) //max_len of 0 performs no copy at all
 135                                                 argstrcpy2(++cp, (char *)arg_ptr, max_len - 1);
 136 #if !CONFIG_EMBEDDED
 137                                         else if(max_len == -1) // unreachable on embedded
 138                                                 argstrcpy(++cp, (char *)arg_ptr);
 139 #endif
 140                                         arg_found = TRUE;
 141                                         break;
 142                         }
 143                         goto gotit;
 144                 }
 145 gotit:
 146                 /* Skip over current arg */
 147                 while(!isargsep(*args)) args++;
 148
 149                 /* Skip leading white space (catch end of args) */
 150                 while(*args && isargsep(*args)) args++;
 151         }
 152
 153         return(arg_found);
 154 }
 155
 156 static boolean_t
 157 isargsep(
 158         char c)
 159 {
 160         if (c == ' ' || c == '\0' || c == '\t')
 161                 return(TRUE);
 162         else
 163                 return(FALSE);
 164 }
 165
 166 #if !CONFIG_EMBEDDED
 167 static int
 168 argstrcpy(
 169         char *from,
 170         char *to)
 171 {
 172         int i = 0;
 173
 174         while (!isargsep(*from)) {
 175                 i++;
 176                 *to++ = *from++;
 177         }
 178         *to = 0;
 179         return(i);
 180 }
 181 #endif
 182
 183 static int
 184 argstrcpy2(
 185         char *from,
 186         char *to,
 187         unsigned maxlen)
 188 {
 189         unsigned int i = 0;
 190
 191         while (!isargsep(*from) && i < maxlen) {
 192                 i++;
 193                 *to++ = *from++;
 194         }
 195         *to = 0;
 196         return(i);
 197 }
 198
 199 static int argnumcpy(int val, void *to, unsigned maxlen)
 200 {
 201         switch (maxlen) {
 202                 case 0:
 203                         /* No write-back, caller just wants to know if arg was found */
 204                         break;
 205                 case 1:
 206                         *(int8_t *)to = val;
 207                         break;
 208                 case 2:
 209                         *(int16_t *)to = val;
 210                         break;
 211                 case 3:
 212                         /* Unlikely in practice */
 213                         ((struct i24 *)to)->i24 = val;
 214                         break;
 215                 case 4:
 216                 default:
 217                         *(int32_t *)to = val;
 218                         maxlen = 4;
 219                         break;
 220         }
 221
 222         return (int)maxlen;
 223 }
 224
 225 static int
 226 getval(
 227         char *s,
 228         int *val)
 229 {
 230         unsigned int radix, intval;
 231     unsigned char c;
 232         int sign = 1;
 233
 234         if (*s == '=') {
 235                 s++;
 236                 if (*s == '-')
 237                         sign = -1, s++;
 238                 intval = *s++-'0';
 239                 radix = 10;
 240                 if (intval == 0) {
 241                         switch(*s) {
 242
 243                         case 'x':
 244                                 radix = 16;
 245                                 s++;
 246                                 break;
 247
 248                         case 'b':
 249                                 radix = 2;
 250                                 s++;
 251                                 break;
 252
 253                         case '0': case '1': case '2': case '3':
 254                         case '4': case '5': case '6': case '7':
 255                                 intval = *s-'0';
 256                                 s++;
 257                                 radix = 8;
 258                                 break;
 259
 260                         default:
 261                                 if (!isargsep(*s))
 262                                         return (STR);
 263                         }
 264                 } else if (intval >= radix) {
 265                     return (STR);
 266                 }
 267                 for(;;) {
 268                         c = *s++;
 269                         if (isargsep(c))
 270                             break;
 271                         if ((radix <= 10) &&
 272                             ((c >= '0') && (c <= ('9' - (10 - radix))))) {
 273                                 c -= '0';
 274                         } else if ((radix == 16) &&
 275                                    ((c >= '0') && (c <= '9'))) {
 276                                 c -= '0';
 277                         } else if ((radix == 16) &&
 278                                    ((c >= 'a') && (c <= 'f'))) {
 279                                 c -= 'a' - 10;
 280                         } else if ((radix == 16) &&
 281                                    ((c >= 'A') && (c <= 'F'))) {
 282                                 c -= 'A' - 10;
 283                         } else if (c == 'k' || c == 'K') {
 284                                 sign *= 1024;
 285                                 break;
 286                         } else if (c == 'm' || c == 'M') {
 287                                 sign *= 1024 * 1024;
 288                                 break;
 289                         } else if (c == 'g' || c == 'G') {
 290                                 sign *= 1024 * 1024 * 1024;
 291                                 break;
 292                         } else {
 293                                 return (STR);
 294                         }
 295                         if (c >= radix)
 296                                 return (STR);
 297                         intval *= radix;
 298                         intval += c;
 299                 }
 300                 if (!isargsep(c) && !isargsep(*s))
 301                     return STR;
 302                 *val = intval * sign;
 303                 return (NUM);
 304         }
 305         *val = 1;
 306         return (NUM);
 307 }
 308
 309 boolean_t
 310 PE_imgsrc_mount_supported()
 311 {
 312         return TRUE;
 313 }
 314
 315 boolean_t
 316 PE_get_default(
 317         const char      *property_name,
 318         void            *property_ptr,
 319         unsigned int max_property)
 320 {
 321         DTEntry         dte;
 322         void            **property_data;
 323         unsigned int property_size;
 324
 325         /*
 326          * Look for the property using the PE DT support.
 327          */
 328         if (kSuccess == DTLookupEntry(NULL, "/defaults", &dte)) {
 329
 330                 /*
 331                  * We have a /defaults node, look for the named property.
 332                  */
 333                 if (kSuccess != DTGetProperty(dte, property_name, (void **)&property_data, &property_size))
 334                         return FALSE;
 335
 336                 /*
 337                  * This would be a fine place to do smart argument size management for 32/64
 338                  * translation, but for now we'll insist that callers know how big their
 339                  * default values are.
 340                  */
 341                 if (property_size > max_property)
 342                         return FALSE;
 343
 344                 /*
 345                  * Copy back the precisely-sized result.
 346                  */
 347                 memcpy(property_ptr, property_data, property_size);
 348                 return TRUE;
 349         }
 350
 351         /*
 352          * Look for the property using I/O Kit's DT support.
 353          */
 354         return IODTGetDefault(property_name, property_ptr, max_property) ? FALSE : TRUE;
 355 }