1 /* 2 * (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <linux/types.h> 9 #include <api_public.h> 10 11 #include "glue.h" 12 13 static int valid_sig(struct api_signature *sig) 14 { 15 uint32_t checksum; 16 struct api_signature s; 17 18 if (sig == NULL) 19 return 0; 20 /* 21 * Clear the checksum field (in the local copy) so as to calculate the 22 * CRC with the same initial contents as at the time when the sig was 23 * produced 24 */ 25 s = *sig; 26 s.checksum = 0; 27 28 checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature)); 29 30 if (checksum != sig->checksum) 31 return 0; 32 33 return 1; 34 } 35 36 /* 37 * Searches for the U-Boot API signature 38 * 39 * returns 1/0 depending on found/not found result 40 */ 41 int api_search_sig(struct api_signature **sig) 42 { 43 unsigned char *sp; 44 uint32_t search_start = 0; 45 uint32_t search_end = 0; 46 47 if (sig == NULL) 48 return 0; 49 50 if (search_hint == 0) 51 search_hint = 255 * 1024 * 1024; 52 53 search_start = search_hint & ~0x000fffff; 54 search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN; 55 56 sp = (unsigned char *)search_start; 57 while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) { 58 if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) { 59 *sig = (struct api_signature *)sp; 60 if (valid_sig(*sig)) 61 return 1; 62 } 63 sp += API_SIG_MAGLEN; 64 } 65 66 *sig = NULL; 67 return 0; 68 } 69 70 /**************************************** 71 * 72 * console 73 * 74 ****************************************/ 75 76 int ub_getc(void) 77 { 78 int c; 79 80 if (!syscall(API_GETC, NULL, &c)) 81 return -1; 82 83 return c; 84 } 85 86 int ub_tstc(void) 87 { 88 int t; 89 90 if (!syscall(API_TSTC, NULL, &t)) 91 return -1; 92 93 return t; 94 } 95 96 void ub_putc(char c) 97 { 98 syscall(API_PUTC, NULL, &c); 99 } 100 101 void ub_puts(const char *s) 102 { 103 syscall(API_PUTS, NULL, s); 104 } 105 106 /**************************************** 107 * 108 * system 109 * 110 ****************************************/ 111 112 void ub_reset(void) 113 { 114 syscall(API_RESET, NULL); 115 } 116 117 static struct mem_region mr[UB_MAX_MR]; 118 static struct sys_info si; 119 120 struct sys_info * ub_get_sys_info(void) 121 { 122 int err = 0; 123 124 memset(&si, 0, sizeof(struct sys_info)); 125 si.mr = mr; 126 si.mr_no = UB_MAX_MR; 127 memset(&mr, 0, sizeof(mr)); 128 129 if (!syscall(API_GET_SYS_INFO, &err, &si)) 130 return NULL; 131 132 return ((err) ? NULL : &si); 133 } 134 135 /**************************************** 136 * 137 * timing 138 * 139 ****************************************/ 140 141 void ub_udelay(unsigned long usec) 142 { 143 syscall(API_UDELAY, NULL, &usec); 144 } 145 146 unsigned long ub_get_timer(unsigned long base) 147 { 148 unsigned long cur; 149 150 if (!syscall(API_GET_TIMER, NULL, &cur, &base)) 151 return 0; 152 153 return cur; 154 } 155 156 157 /**************************************************************************** 158 * 159 * devices 160 * 161 * Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1 162 * 163 ***************************************************************************/ 164 165 static struct device_info devices[UB_MAX_DEV]; 166 167 struct device_info * ub_dev_get(int i) 168 { 169 return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]); 170 } 171 172 /* 173 * Enumerates the devices: fills out device_info elements in the devices[] 174 * array. 175 * 176 * returns: number of devices found 177 */ 178 int ub_dev_enum(void) 179 { 180 struct device_info *di; 181 int n = 0; 182 183 memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV); 184 di = &devices[0]; 185 186 if (!syscall(API_DEV_ENUM, NULL, di)) 187 return 0; 188 189 while (di->cookie != NULL) { 190 191 if (++n >= UB_MAX_DEV) 192 break; 193 194 /* take another device_info */ 195 di++; 196 197 /* pass on the previous cookie */ 198 di->cookie = devices[n - 1].cookie; 199 200 if (!syscall(API_DEV_ENUM, NULL, di)) 201 return 0; 202 } 203 204 return n; 205 } 206 207 /* 208 * handle: 0-based id of the device 209 * 210 * returns: 0 when OK, err otherwise 211 */ 212 int ub_dev_open(int handle) 213 { 214 struct device_info *di; 215 int err = 0; 216 217 if (handle < 0 || handle >= UB_MAX_DEV) 218 return API_EINVAL; 219 220 di = &devices[handle]; 221 222 if (!syscall(API_DEV_OPEN, &err, di)) 223 return -1; 224 225 return err; 226 } 227 228 int ub_dev_close(int handle) 229 { 230 struct device_info *di; 231 232 if (handle < 0 || handle >= UB_MAX_DEV) 233 return API_EINVAL; 234 235 di = &devices[handle]; 236 if (!syscall(API_DEV_CLOSE, NULL, di)) 237 return -1; 238 239 return 0; 240 } 241 242 /* 243 * 244 * Validates device for read/write, it has to: 245 * 246 * - have sane handle 247 * - be opened 248 * 249 * returns: 0/1 accordingly 250 */ 251 static int dev_valid(int handle) 252 { 253 if (handle < 0 || handle >= UB_MAX_DEV) 254 return 0; 255 256 if (devices[handle].state != DEV_STA_OPEN) 257 return 0; 258 259 return 1; 260 } 261 262 static int dev_stor_valid(int handle) 263 { 264 if (!dev_valid(handle)) 265 return 0; 266 267 if (!(devices[handle].type & DEV_TYP_STOR)) 268 return 0; 269 270 return 1; 271 } 272 273 int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start, 274 lbasize_t *rlen) 275 { 276 struct device_info *di; 277 lbasize_t act_len; 278 int err = 0; 279 280 if (!dev_stor_valid(handle)) 281 return API_ENODEV; 282 283 di = &devices[handle]; 284 if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len)) 285 return API_ESYSC; 286 287 if (!err && rlen) 288 *rlen = act_len; 289 290 return err; 291 } 292 293 static int dev_net_valid(int handle) 294 { 295 if (!dev_valid(handle)) 296 return 0; 297 298 if (devices[handle].type != DEV_TYP_NET) 299 return 0; 300 301 return 1; 302 } 303 304 int ub_dev_recv(int handle, void *buf, int len, int *rlen) 305 { 306 struct device_info *di; 307 int err = 0, act_len; 308 309 if (!dev_net_valid(handle)) 310 return API_ENODEV; 311 312 di = &devices[handle]; 313 if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len)) 314 return API_ESYSC; 315 316 if (!err && rlen) 317 *rlen = act_len; 318 319 return (err); 320 } 321 322 int ub_dev_send(int handle, void *buf, int len) 323 { 324 struct device_info *di; 325 int err = 0; 326 327 if (!dev_net_valid(handle)) 328 return API_ENODEV; 329 330 di = &devices[handle]; 331 if (!syscall(API_DEV_WRITE, &err, di, buf, &len)) 332 return API_ESYSC; 333 334 return err; 335 } 336 337 /**************************************** 338 * 339 * env vars 340 * 341 ****************************************/ 342 343 char * ub_env_get(const char *name) 344 { 345 char *value; 346 347 if (!syscall(API_ENV_GET, NULL, name, &value)) 348 return NULL; 349 350 return value; 351 } 352 353 void ub_env_set(const char *name, char *value) 354 { 355 syscall(API_ENV_SET, NULL, name, value); 356 } 357 358 static char env_name[256]; 359 360 const char * ub_env_enum(const char *last) 361 { 362 const char *env, *str; 363 int i; 364 365 env = NULL; 366 367 /* 368 * It's OK to pass only the name piece as last (and not the whole 369 * 'name=val' string), since the API_ENUM_ENV call uses envmatch() 370 * internally, which handles such case 371 */ 372 if (!syscall(API_ENV_ENUM, NULL, last, &env)) 373 return NULL; 374 375 if (!env) 376 /* no more env. variables to enumerate */ 377 return NULL; 378 379 /* next enumerated env var */ 380 memset(env_name, 0, 256); 381 for (i = 0, str = env; *str != '=' && *str != '\0';) 382 env_name[i++] = *str++; 383 384 env_name[i] = '\0'; 385 386 return env_name; 387 } 388 389 /**************************************** 390 * 391 * display 392 * 393 ****************************************/ 394 395 int ub_display_get_info(int type, struct display_info *di) 396 { 397 int err = 0; 398 399 if (!syscall(API_DISPLAY_GET_INFO, &err, type, di)) 400 return API_ESYSC; 401 402 return err; 403 } 404 405 int ub_display_draw_bitmap(ulong bitmap, int x, int y) 406 { 407 int err = 0; 408 409 if (!syscall(API_DISPLAY_DRAW_BITMAP, &err, bitmap, x, y)) 410 return API_ESYSC; 411 412 return err; 413 } 414 415 void ub_display_clear(void) 416 { 417 syscall(API_DISPLAY_CLEAR, NULL); 418 } 419