1 | /* |
2 | * Copyright (c) 2000-2016 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 | typedef boolean_t (*argsep_func_t) (char c); |
32 | |
33 | static boolean_t isargsep( char c); |
34 | static boolean_t israngesep( char c); |
35 | #ifndef CONFIG_EMBEDDED |
36 | static int argstrcpy(char *from, char *to); |
37 | #endif |
38 | static int argstrcpy2(char *from,char *to, unsigned maxlen); |
39 | static int argnumcpy(long long val, void *to, unsigned maxlen); |
40 | static int getval(char *s, long long *val, argsep_func_t issep, boolean_t skip_equal_sign); |
41 | boolean_t get_range_bounds(char * c, int64_t * lower, int64_t * upper); |
42 | |
43 | extern int IODTGetDefault(const char *key, void *infoAddr, unsigned int infoSize); |
44 | |
45 | |
46 | struct i24 { |
47 | int32_t i24 : 24; |
48 | int32_t _pad : 8; |
49 | }; |
50 | |
51 | #define NUM 0 |
52 | #define STR 1 |
53 | |
54 | #if !defined(__LP64__) && !defined(__arm__) |
55 | boolean_t |
56 | PE_parse_boot_arg( |
57 | const char *arg_string, |
58 | void *arg_ptr) |
59 | { |
60 | int max_len = -1; |
61 | |
62 | #if CONFIG_EMBEDDED |
63 | /* Limit arg size to 4 byte when no size is given */ |
64 | max_len = 4; |
65 | #endif |
66 | |
67 | return PE_parse_boot_argn(arg_string, arg_ptr, max_len); |
68 | } |
69 | #endif |
70 | |
71 | static boolean_t |
72 | PE_parse_boot_argn_internal( |
73 | const char *arg_string, |
74 | void * arg_ptr, |
75 | int max_len, |
76 | boolean_t force_string) |
77 | { |
78 | char *args; |
79 | char *cp, c; |
80 | uintptr_t i; |
81 | long long val = 0; |
82 | boolean_t arg_boolean; |
83 | boolean_t arg_found; |
84 | |
85 | args = PE_boot_args(); |
86 | if (*args == '\0') return FALSE; |
87 | |
88 | #ifdef CONFIG_EMBEDDED |
89 | if (max_len == -1) return FALSE; |
90 | #endif |
91 | |
92 | arg_found = FALSE; |
93 | |
94 | while(*args && isargsep(*args)) args++; |
95 | |
96 | while (*args) |
97 | { |
98 | if (*args == '-') |
99 | arg_boolean = TRUE; |
100 | else |
101 | arg_boolean = FALSE; |
102 | |
103 | cp = args; |
104 | while (!isargsep (*cp) && *cp != '=') |
105 | cp++; |
106 | if (*cp != '=' && !arg_boolean) |
107 | goto gotit; |
108 | |
109 | c = *cp; |
110 | |
111 | i = cp-args; |
112 | if (strncmp(args, arg_string, i) || |
113 | (i!=strlen(arg_string))) |
114 | goto gotit; |
115 | |
116 | if (arg_boolean) { |
117 | if (!force_string) { |
118 | if (max_len > 0) { |
119 | argnumcpy(1, arg_ptr, max_len);/* max_len of 0 performs no copy at all*/ |
120 | arg_found = TRUE; |
121 | } |
122 | else if (max_len == 0) { |
123 | arg_found = TRUE; |
124 | } |
125 | } |
126 | break; |
127 | } else { |
128 | while (*cp && isargsep (*cp)) |
129 | cp++; |
130 | if (*cp == '=' && c != '=') { |
131 | args = cp+1; |
132 | goto gotit; |
133 | } |
134 | if ('_' == *arg_string) /* Force a string copy if the argument name begins with an underscore */ |
135 | { |
136 | if (max_len > 0) { |
137 | int hacklen = 17 > max_len ? 17 : max_len; |
138 | argstrcpy2 (++cp, (char *)arg_ptr, hacklen - 1); /* Hack - terminate after 16 characters */ |
139 | arg_found = TRUE; |
140 | } |
141 | else if (max_len == 0) { |
142 | arg_found = TRUE; |
143 | } |
144 | break; |
145 | } |
146 | switch ((force_string && *cp == '=') ? STR : getval(cp, &val, isargsep, FALSE)) |
147 | { |
148 | case NUM: |
149 | if (max_len > 0) { |
150 | argnumcpy(val, arg_ptr, max_len); |
151 | arg_found = TRUE; |
152 | } |
153 | else if (max_len == 0) { |
154 | arg_found = TRUE; |
155 | } |
156 | break; |
157 | case STR: |
158 | if (max_len > 0) { |
159 | argstrcpy2(++cp, (char *)arg_ptr, max_len - 1);/*max_len of 0 performs no copy at all*/ |
160 | arg_found = TRUE; |
161 | } |
162 | else if (max_len == 0) { |
163 | arg_found = TRUE; |
164 | } |
165 | #if !CONFIG_EMBEDDED |
166 | else if (max_len == -1) { /* unreachable on embedded */ |
167 | argstrcpy(++cp, (char *)arg_ptr); |
168 | arg_found = TRUE; |
169 | } |
170 | #endif |
171 | break; |
172 | } |
173 | goto gotit; |
174 | } |
175 | gotit: |
176 | /* Skip over current arg */ |
177 | while(!isargsep(*args)) args++; |
178 | |
179 | /* Skip leading white space (catch end of args) */ |
180 | while(*args && isargsep(*args)) args++; |
181 | } |
182 | |
183 | return(arg_found); |
184 | } |
185 | |
186 | boolean_t |
187 | PE_parse_boot_argn( |
188 | const char *arg_string, |
189 | void *arg_ptr, |
190 | int max_len) |
191 | { |
192 | return PE_parse_boot_argn_internal(arg_string, arg_ptr, max_len, FALSE); |
193 | } |
194 | |
195 | boolean_t |
196 | PE_parse_boot_arg_str( |
197 | const char *arg_string, |
198 | char *arg_ptr, |
199 | int strlen) |
200 | { |
201 | return PE_parse_boot_argn_internal(arg_string, arg_ptr, strlen, TRUE); |
202 | } |
203 | |
204 | static boolean_t |
205 | isargsep(char c) |
206 | { |
207 | if (c == ' ' || c == '\0' || c == '\t') |
208 | return (TRUE); |
209 | else |
210 | return (FALSE); |
211 | } |
212 | |
213 | static boolean_t |
214 | israngesep(char c) |
215 | { |
216 | if (isargsep(c) || c == '_' || c == ',') |
217 | return (TRUE); |
218 | else |
219 | return (FALSE); |
220 | } |
221 | |
222 | #if !CONFIG_EMBEDDED |
223 | static int |
224 | argstrcpy( |
225 | char *from, |
226 | char *to) |
227 | { |
228 | int i = 0; |
229 | |
230 | while (!isargsep(*from)) { |
231 | i++; |
232 | *to++ = *from++; |
233 | } |
234 | *to = 0; |
235 | return(i); |
236 | } |
237 | #endif |
238 | |
239 | static int |
240 | argstrcpy2( |
241 | char *from, |
242 | char *to, |
243 | unsigned maxlen) |
244 | { |
245 | unsigned int i = 0; |
246 | |
247 | while (!isargsep(*from) && i < maxlen) { |
248 | i++; |
249 | *to++ = *from++; |
250 | } |
251 | *to = 0; |
252 | return(i); |
253 | } |
254 | |
255 | static int argnumcpy(long long val, void *to, unsigned maxlen) |
256 | { |
257 | switch (maxlen) { |
258 | case 0: |
259 | /* No write-back, caller just wants to know if arg was found */ |
260 | break; |
261 | case 1: |
262 | *(int8_t *)to = val; |
263 | break; |
264 | case 2: |
265 | *(int16_t *)to = val; |
266 | break; |
267 | case 3: |
268 | /* Unlikely in practice */ |
269 | ((struct i24 *)to)->i24 = val; |
270 | break; |
271 | case 4: |
272 | *(int32_t *)to = val; |
273 | break; |
274 | case 8: |
275 | *(int64_t *)to = val; |
276 | break; |
277 | default: |
278 | *(int32_t *)to = val; |
279 | maxlen = 4; |
280 | break; |
281 | } |
282 | |
283 | return (int)maxlen; |
284 | } |
285 | |
286 | static int |
287 | getval( |
288 | char *s, |
289 | long long *val, |
290 | argsep_func_t issep, |
291 | boolean_t skip_equal_sign ) |
292 | { |
293 | unsigned long long radix, intval; |
294 | unsigned char c; |
295 | int sign = 1; |
296 | boolean_t has_value = FALSE; |
297 | |
298 | if (*s == '=') { |
299 | s++; |
300 | has_value = TRUE; |
301 | } |
302 | |
303 | if (has_value || skip_equal_sign) { |
304 | if (*s == '-') { |
305 | sign = -1; |
306 | s++; |
307 | } |
308 | intval = *s++-'0'; |
309 | radix = 10; |
310 | if (intval == 0) { |
311 | switch(*s) { |
312 | |
313 | case 'x': |
314 | radix = 16; |
315 | s++; |
316 | break; |
317 | |
318 | case 'b': |
319 | radix = 2; |
320 | s++; |
321 | break; |
322 | |
323 | case '0': case '1': case '2': case '3': |
324 | case '4': case '5': case '6': case '7': |
325 | intval = *s-'0'; |
326 | s++; |
327 | radix = 8; |
328 | break; |
329 | |
330 | default: |
331 | if (!issep(*s)) |
332 | return (STR); |
333 | } |
334 | } else if (intval >= radix) { |
335 | return (STR); |
336 | } |
337 | for(;;) { |
338 | c = *s++; |
339 | if (issep(c)) |
340 | break; |
341 | if ((radix <= 10) && |
342 | ((c >= '0') && (c <= ('9' - (10 - radix))))) { |
343 | c -= '0'; |
344 | } else if ((radix == 16) && |
345 | ((c >= '0') && (c <= '9'))) { |
346 | c -= '0'; |
347 | } else if ((radix == 16) && |
348 | ((c >= 'a') && (c <= 'f'))) { |
349 | c -= 'a' - 10; |
350 | } else if ((radix == 16) && |
351 | ((c >= 'A') && (c <= 'F'))) { |
352 | c -= 'A' - 10; |
353 | } else if (c == 'k' || c == 'K') { |
354 | sign *= 1024; |
355 | break; |
356 | } else if (c == 'm' || c == 'M') { |
357 | sign *= 1024 * 1024; |
358 | break; |
359 | } else if (c == 'g' || c == 'G') { |
360 | sign *= 1024 * 1024 * 1024; |
361 | break; |
362 | } else { |
363 | return (STR); |
364 | } |
365 | if (c >= radix) |
366 | return (STR); |
367 | intval *= radix; |
368 | intval += c; |
369 | } |
370 | if (!issep(c) && !issep(*s)) |
371 | return STR; |
372 | *val = intval * sign; |
373 | return (NUM); |
374 | } |
375 | *val = 1; |
376 | return (NUM); |
377 | } |
378 | |
379 | boolean_t |
380 | PE_imgsrc_mount_supported() |
381 | { |
382 | return TRUE; |
383 | } |
384 | |
385 | boolean_t |
386 | PE_get_default( |
387 | const char *property_name, |
388 | void *property_ptr, |
389 | unsigned int max_property) |
390 | { |
391 | DTEntry dte; |
392 | void **property_data; |
393 | unsigned int property_size; |
394 | |
395 | /* |
396 | * Look for the property using the PE DT support. |
397 | */ |
398 | if (kSuccess == DTLookupEntry(NULL, "/defaults" , &dte)) { |
399 | |
400 | /* |
401 | * We have a /defaults node, look for the named property. |
402 | */ |
403 | if (kSuccess != DTGetProperty(dte, property_name, (void **)&property_data, &property_size)) |
404 | return FALSE; |
405 | |
406 | /* |
407 | * This would be a fine place to do smart argument size management for 32/64 |
408 | * translation, but for now we'll insist that callers know how big their |
409 | * default values are. |
410 | */ |
411 | if (property_size > max_property) |
412 | return FALSE; |
413 | |
414 | /* |
415 | * Copy back the precisely-sized result. |
416 | */ |
417 | memcpy(property_ptr, property_data, property_size); |
418 | return TRUE; |
419 | } |
420 | |
421 | /* |
422 | * Look for the property using I/O Kit's DT support. |
423 | */ |
424 | return IODTGetDefault(property_name, property_ptr, max_property) ? FALSE : TRUE; |
425 | } |
426 | |
427 | /* function: get_range_bounds |
428 | * Parse a range string like "1_3,5_20" and return 1,3 as lower and upper. |
429 | * Note: '_' is separator for bounds integer delimiter and |
430 | * ',' is considered as separator for range pair. |
431 | * returns TRUE when both range values are found |
432 | */ |
433 | boolean_t |
434 | get_range_bounds(char *c, int64_t *lower, int64_t *upper) |
435 | { |
436 | if (c == NULL || lower == NULL || upper == NULL) { |
437 | return FALSE; |
438 | } |
439 | |
440 | if (NUM != getval(c, lower, israngesep, TRUE)) { |
441 | return FALSE; |
442 | } |
443 | |
444 | while (*c != '\0') { |
445 | if (*c == '_') { |
446 | break; |
447 | } |
448 | c++; |
449 | } |
450 | |
451 | if (*c == '_') { |
452 | c++; |
453 | if (NUM != getval(c, upper, israngesep, TRUE)) { |
454 | return FALSE; |
455 | } |
456 | } else { |
457 | return FALSE; |
458 | } |
459 | return TRUE; |
460 | } |
461 | |