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500856eb | 1 | /* |
923aa481 | 2 | * (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com> |
500856eb RJ |
3 | * |
4 | * See file CREDITS for list of people who contributed to this | |
5 | * project. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <common.h> | |
25 | #include <linux/types.h> | |
26 | #include <api_public.h> | |
27 | ||
28 | #include "glue.h" | |
29 | ||
30 | static int valid_sig(struct api_signature *sig) | |
31 | { | |
32 | uint32_t checksum; | |
33 | struct api_signature s; | |
34 | ||
35 | if (sig == NULL) | |
36 | return 0; | |
37 | /* | |
38 | * Clear the checksum field (in the local copy) so as to calculate the | |
39 | * CRC with the same initial contents as at the time when the sig was | |
40 | * produced | |
41 | */ | |
42 | s = *sig; | |
43 | s.checksum = 0; | |
44 | ||
45 | checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature)); | |
46 | ||
47 | if (checksum != sig->checksum) | |
48 | return 0; | |
49 | ||
50 | return 1; | |
51 | } | |
52 | ||
53 | /* | |
54 | * Searches for the U-Boot API signature | |
55 | * | |
56 | * returns 1/0 depending on found/not found result | |
57 | */ | |
923aa481 RJ |
58 | int api_search_sig(struct api_signature **sig) |
59 | { | |
500856eb | 60 | unsigned char *sp; |
b84d7d8f RJ |
61 | uint32_t search_start = 0; |
62 | uint32_t search_end = 0; | |
500856eb RJ |
63 | |
64 | if (sig == NULL) | |
65 | return 0; | |
66 | ||
b84d7d8f RJ |
67 | if (search_hint == 0) |
68 | search_hint = 255 * 1024 * 1024; | |
500856eb | 69 | |
b84d7d8f RJ |
70 | search_start = search_hint & ~0x000fffff; |
71 | search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN; | |
72 | ||
73 | sp = (unsigned char *)search_start; | |
74 | while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) { | |
500856eb RJ |
75 | if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) { |
76 | *sig = (struct api_signature *)sp; | |
77 | if (valid_sig(*sig)) | |
78 | return 1; | |
79 | } | |
80 | sp += API_SIG_MAGLEN; | |
81 | } | |
82 | ||
83 | *sig = NULL; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | /**************************************** | |
88 | * | |
89 | * console | |
90 | * | |
91 | ****************************************/ | |
92 | ||
93 | int ub_getc(void) | |
94 | { | |
95 | int c; | |
96 | ||
97 | if (!syscall(API_GETC, NULL, (uint32_t)&c)) | |
98 | return -1; | |
99 | ||
100 | return c; | |
101 | } | |
102 | ||
103 | int ub_tstc(void) | |
104 | { | |
105 | int t; | |
106 | ||
107 | if (!syscall(API_TSTC, NULL, (uint32_t)&t)) | |
108 | return -1; | |
109 | ||
110 | return t; | |
111 | } | |
112 | ||
113 | void ub_putc(char c) | |
114 | { | |
115 | syscall(API_PUTC, NULL, (uint32_t)&c); | |
116 | } | |
117 | ||
118 | void ub_puts(const char *s) | |
119 | { | |
120 | syscall(API_PUTS, NULL, (uint32_t)s); | |
121 | } | |
122 | ||
123 | /**************************************** | |
124 | * | |
125 | * system | |
126 | * | |
127 | ****************************************/ | |
128 | ||
129 | void ub_reset(void) | |
130 | { | |
131 | syscall(API_RESET, NULL); | |
132 | } | |
133 | ||
923aa481 | 134 | static struct mem_region mr[UB_MAX_MR]; |
500856eb RJ |
135 | static struct sys_info si; |
136 | ||
137 | struct sys_info * ub_get_sys_info(void) | |
138 | { | |
139 | int err = 0; | |
140 | ||
141 | memset(&si, 0, sizeof(struct sys_info)); | |
142 | si.mr = mr; | |
923aa481 | 143 | si.mr_no = UB_MAX_MR; |
500856eb RJ |
144 | memset(&mr, 0, sizeof(mr)); |
145 | ||
146 | if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si)) | |
147 | return NULL; | |
148 | ||
149 | return ((err) ? NULL : &si); | |
150 | } | |
151 | ||
152 | /**************************************** | |
153 | * | |
154 | * timing | |
155 | * | |
156 | ****************************************/ | |
d3a6532c | 157 | |
500856eb RJ |
158 | void ub_udelay(unsigned long usec) |
159 | { | |
160 | syscall(API_UDELAY, NULL, &usec); | |
161 | } | |
162 | ||
163 | unsigned long ub_get_timer(unsigned long base) | |
164 | { | |
165 | unsigned long cur; | |
166 | ||
167 | if (!syscall(API_GET_TIMER, NULL, &cur, &base)) | |
168 | return 0; | |
169 | ||
170 | return cur; | |
171 | } | |
172 | ||
173 | ||
174 | /**************************************************************************** | |
175 | * | |
176 | * devices | |
177 | * | |
923aa481 | 178 | * Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1 |
500856eb RJ |
179 | * |
180 | ***************************************************************************/ | |
181 | ||
923aa481 | 182 | static struct device_info devices[UB_MAX_DEV]; |
500856eb RJ |
183 | |
184 | struct device_info * ub_dev_get(int i) | |
185 | { | |
923aa481 | 186 | return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]); |
500856eb RJ |
187 | } |
188 | ||
189 | /* | |
190 | * Enumerates the devices: fills out device_info elements in the devices[] | |
191 | * array. | |
192 | * | |
193 | * returns: number of devices found | |
194 | */ | |
195 | int ub_dev_enum(void) | |
196 | { | |
197 | struct device_info *di; | |
198 | int n = 0; | |
199 | ||
923aa481 | 200 | memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV); |
500856eb RJ |
201 | di = &devices[0]; |
202 | ||
203 | if (!syscall(API_DEV_ENUM, NULL, di)) | |
204 | return 0; | |
205 | ||
206 | while (di->cookie != NULL) { | |
207 | ||
923aa481 | 208 | if (++n >= UB_MAX_DEV) |
500856eb RJ |
209 | break; |
210 | ||
211 | /* take another device_info */ | |
212 | di++; | |
213 | ||
214 | /* pass on the previous cookie */ | |
215 | di->cookie = devices[n - 1].cookie; | |
216 | ||
217 | if (!syscall(API_DEV_ENUM, NULL, di)) | |
218 | return 0; | |
219 | } | |
220 | ||
221 | return n; | |
222 | } | |
223 | ||
224 | /* | |
225 | * handle: 0-based id of the device | |
226 | * | |
227 | * returns: 0 when OK, err otherwise | |
228 | */ | |
229 | int ub_dev_open(int handle) | |
230 | { | |
231 | struct device_info *di; | |
232 | int err = 0; | |
233 | ||
923aa481 | 234 | if (handle < 0 || handle >= UB_MAX_DEV) |
500856eb RJ |
235 | return API_EINVAL; |
236 | ||
237 | di = &devices[handle]; | |
238 | ||
239 | if (!syscall(API_DEV_OPEN, &err, di)) | |
240 | return -1; | |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
245 | int ub_dev_close(int handle) | |
246 | { | |
247 | struct device_info *di; | |
248 | ||
923aa481 | 249 | if (handle < 0 || handle >= UB_MAX_DEV) |
500856eb RJ |
250 | return API_EINVAL; |
251 | ||
252 | di = &devices[handle]; | |
253 | if (!syscall(API_DEV_CLOSE, NULL, di)) | |
254 | return -1; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | /* | |
260 | * | |
261 | * Validates device for read/write, it has to: | |
262 | * | |
263 | * - have sane handle | |
264 | * - be opened | |
265 | * | |
266 | * returns: 0/1 accordingly | |
267 | */ | |
268 | static int dev_valid(int handle) | |
269 | { | |
923aa481 | 270 | if (handle < 0 || handle >= UB_MAX_DEV) |
500856eb RJ |
271 | return 0; |
272 | ||
273 | if (devices[handle].state != DEV_STA_OPEN) | |
274 | return 0; | |
275 | ||
276 | return 1; | |
277 | } | |
278 | ||
279 | static int dev_stor_valid(int handle) | |
280 | { | |
281 | if (!dev_valid(handle)) | |
282 | return 0; | |
283 | ||
284 | if (!(devices[handle].type & DEV_TYP_STOR)) | |
285 | return 0; | |
286 | ||
287 | return 1; | |
288 | } | |
289 | ||
923aa481 RJ |
290 | int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start, |
291 | lbasize_t *rlen) | |
500856eb RJ |
292 | { |
293 | struct device_info *di; | |
294 | lbasize_t act_len; | |
295 | int err = 0; | |
296 | ||
297 | if (!dev_stor_valid(handle)) | |
298 | return API_ENODEV; | |
299 | ||
300 | di = &devices[handle]; | |
301 | if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len)) | |
923aa481 | 302 | return API_ESYSC; |
500856eb | 303 | |
923aa481 RJ |
304 | if (!err && rlen) |
305 | *rlen = act_len; | |
500856eb | 306 | |
923aa481 | 307 | return err; |
500856eb RJ |
308 | } |
309 | ||
310 | static int dev_net_valid(int handle) | |
311 | { | |
312 | if (!dev_valid(handle)) | |
313 | return 0; | |
314 | ||
315 | if (devices[handle].type != DEV_TYP_NET) | |
316 | return 0; | |
317 | ||
318 | return 1; | |
319 | } | |
320 | ||
923aa481 | 321 | int ub_dev_recv(int handle, void *buf, int len, int *rlen) |
500856eb RJ |
322 | { |
323 | struct device_info *di; | |
324 | int err = 0, act_len; | |
325 | ||
326 | if (!dev_net_valid(handle)) | |
327 | return API_ENODEV; | |
328 | ||
329 | di = &devices[handle]; | |
330 | if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len)) | |
923aa481 | 331 | return API_ESYSC; |
500856eb | 332 | |
923aa481 RJ |
333 | if (!err && rlen) |
334 | *rlen = act_len; | |
500856eb | 335 | |
923aa481 | 336 | return (err); |
500856eb RJ |
337 | } |
338 | ||
339 | int ub_dev_send(int handle, void *buf, int len) | |
340 | { | |
341 | struct device_info *di; | |
342 | int err = 0; | |
343 | ||
344 | if (!dev_net_valid(handle)) | |
345 | return API_ENODEV; | |
346 | ||
347 | di = &devices[handle]; | |
348 | if (!syscall(API_DEV_WRITE, &err, di, buf, &len)) | |
923aa481 | 349 | return API_ESYSC; |
500856eb RJ |
350 | |
351 | return err; | |
352 | } | |
353 | ||
354 | /**************************************** | |
355 | * | |
356 | * env vars | |
357 | * | |
358 | ****************************************/ | |
359 | ||
360 | char * ub_env_get(const char *name) | |
361 | { | |
362 | char *value; | |
363 | ||
364 | if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value)) | |
365 | return NULL; | |
366 | ||
367 | return value; | |
368 | } | |
369 | ||
370 | void ub_env_set(const char *name, char *value) | |
371 | { | |
372 | syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value); | |
373 | } | |
374 | ||
500856eb RJ |
375 | static char env_name[256]; |
376 | ||
377 | const char * ub_env_enum(const char *last) | |
378 | { | |
379 | const char *env, *str; | |
380 | int i; | |
381 | ||
382 | env = NULL; | |
383 | ||
384 | /* | |
385 | * It's OK to pass only the name piece as last (and not the whole | |
386 | * 'name=val' string), since the API_ENUM_ENV call uses envmatch() | |
387 | * internally, which handles such case | |
388 | */ | |
389 | if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env)) | |
390 | return NULL; | |
391 | ||
392 | if (!env) | |
393 | /* no more env. variables to enumerate */ | |
394 | return NULL; | |
395 | ||
396 | /* next enumerated env var */ | |
397 | memset(env_name, 0, 256); | |
398 | for (i = 0, str = env; *str != '=' && *str != '\0';) | |
399 | env_name[i++] = *str++; | |
400 | ||
401 | env_name[i] = '\0'; | |
402 | ||
403 | return env_name; | |
404 | } |