1 /* 2 * Copyright 2016 NXP Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <errno.h> 9 #include <linux/kernel.h> 10 #include <asm/io.h> 11 #include <asm/system.h> 12 #include <asm/types.h> 13 #include <asm/macro.h> 14 #include <asm/armv8/sec_firmware.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 extern void c_runtime_cpu_setup(void); 18 19 #define SEC_FIRMWARE_LOADED 0x1 20 #define SEC_FIRMWARE_RUNNING 0x2 21 #define SEC_FIRMWARE_ADDR_MASK (~0x3) 22 /* 23 * Secure firmware load addr 24 * Flags used: 0x1 secure firmware has been loaded to secure memory 25 * 0x2 secure firmware is running 26 */ 27 phys_addr_t sec_firmware_addr; 28 29 #ifndef SEC_FIRMWARE_FIT_IMAGE 30 #define SEC_FIRMWARE_FIT_IMAGE "firmware" 31 #endif 32 #ifndef SEC_FIRMEWARE_FIT_CNF_NAME 33 #define SEC_FIRMEWARE_FIT_CNF_NAME "config-1" 34 #endif 35 #ifndef SEC_FIRMWARE_TARGET_EL 36 #define SEC_FIRMWARE_TARGET_EL 2 37 #endif 38 39 static int sec_firmware_get_data(const void *sec_firmware_img, 40 const void **data, size_t *size) 41 { 42 int conf_node_off, fw_node_off; 43 char *conf_node_name = NULL; 44 char *desc; 45 int ret; 46 47 conf_node_name = SEC_FIRMEWARE_FIT_CNF_NAME; 48 49 conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name); 50 if (conf_node_off < 0) { 51 printf("SEC Firmware: %s: no such config\n", conf_node_name); 52 return -ENOENT; 53 } 54 55 fw_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off, 56 SEC_FIRMWARE_FIT_IMAGE); 57 if (fw_node_off < 0) { 58 printf("SEC Firmware: No '%s' in config\n", 59 SEC_FIRMWARE_FIT_IMAGE); 60 return -ENOLINK; 61 } 62 63 /* Verify secure firmware image */ 64 if (!(fit_image_verify(sec_firmware_img, fw_node_off))) { 65 printf("SEC Firmware: Bad firmware image (bad CRC)\n"); 66 return -EINVAL; 67 } 68 69 if (fit_image_get_data(sec_firmware_img, fw_node_off, data, size)) { 70 printf("SEC Firmware: Can't get %s subimage data/size", 71 SEC_FIRMWARE_FIT_IMAGE); 72 return -ENOENT; 73 } 74 75 ret = fit_get_desc(sec_firmware_img, fw_node_off, &desc); 76 if (ret) 77 printf("SEC Firmware: Can't get description\n"); 78 else 79 printf("%s\n", desc); 80 81 return ret; 82 } 83 84 /* 85 * SEC Firmware FIT image parser checks if the image is in FIT 86 * format, verifies integrity of the image and calculates raw 87 * image address and size values. 88 * 89 * Returns 0 on success and a negative errno on error task fail. 90 */ 91 static int sec_firmware_parse_image(const void *sec_firmware_img, 92 const void **raw_image_addr, 93 size_t *raw_image_size) 94 { 95 int ret; 96 97 ret = sec_firmware_get_data(sec_firmware_img, raw_image_addr, 98 raw_image_size); 99 if (ret) 100 return ret; 101 102 debug("SEC Firmware: raw_image_addr = 0x%p, raw_image_size = 0x%lx\n", 103 *raw_image_addr, *raw_image_size); 104 105 return 0; 106 } 107 108 /* 109 * SEC Firmware FIT image parser to check if any loadable is 110 * present. If present, verify integrity of the loadable and 111 * copy loadable to address provided in (loadable_h, loadable_l). 112 * 113 * Returns 0 on success and a negative errno on error task fail. 114 */ 115 static int sec_firmware_check_copy_loadable(const void *sec_firmware_img, 116 u32 *loadable_l, u32 *loadable_h) 117 { 118 phys_addr_t sec_firmware_loadable_addr = 0; 119 int conf_node_off, ld_node_off; 120 char *conf_node_name = NULL; 121 const void *data; 122 size_t size; 123 ulong load; 124 125 conf_node_name = SEC_FIRMEWARE_FIT_CNF_NAME; 126 127 conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name); 128 if (conf_node_off < 0) { 129 printf("SEC Firmware: %s: no such config\n", conf_node_name); 130 return -ENOENT; 131 } 132 133 ld_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off, 134 FIT_LOADABLE_PROP); 135 if (ld_node_off >= 0) { 136 printf("SEC Firmware: '%s' present in config\n", 137 FIT_LOADABLE_PROP); 138 139 /* Verify secure firmware image */ 140 if (!(fit_image_verify(sec_firmware_img, ld_node_off))) { 141 printf("SEC Loadable: Bad loadable image (bad CRC)\n"); 142 return -EINVAL; 143 } 144 145 if (fit_image_get_data(sec_firmware_img, ld_node_off, 146 &data, &size)) { 147 printf("SEC Loadable: Can't get subimage data/size"); 148 return -ENOENT; 149 } 150 151 /* Get load address, treated as load offset to secure memory */ 152 if (fit_image_get_load(sec_firmware_img, ld_node_off, &load)) { 153 printf("SEC Loadable: Can't get subimage load"); 154 return -ENOENT; 155 } 156 157 /* Compute load address for loadable in secure memory */ 158 sec_firmware_loadable_addr = (sec_firmware_addr - 159 gd->arch.tlb_size) + load; 160 161 /* Copy loadable to secure memory and flush dcache */ 162 debug("%s copied to address 0x%p\n", 163 FIT_LOADABLE_PROP, (void *)sec_firmware_loadable_addr); 164 memcpy((void *)sec_firmware_loadable_addr, data, size); 165 flush_dcache_range(sec_firmware_loadable_addr, 166 sec_firmware_loadable_addr + size); 167 } 168 169 /* Populate address ptrs for loadable image with loadbale addr */ 170 out_le32(loadable_l, (sec_firmware_loadable_addr & WORD_MASK)); 171 out_le32(loadable_h, (sec_firmware_loadable_addr >> WORD_SHIFT)); 172 173 return 0; 174 } 175 176 static int sec_firmware_copy_image(const char *title, 177 u64 image_addr, u32 image_size, u64 sec_firmware) 178 { 179 debug("%s copied to address 0x%p\n", title, (void *)sec_firmware); 180 memcpy((void *)sec_firmware, (void *)image_addr, image_size); 181 flush_dcache_range(sec_firmware, sec_firmware + image_size); 182 183 return 0; 184 } 185 186 /* 187 * This function will parse the SEC Firmware image, and then load it 188 * to secure memory. Also load any loadable if present along with SEC 189 * Firmware image. 190 */ 191 static int sec_firmware_load_image(const void *sec_firmware_img, 192 u32 *loadable_l, u32 *loadable_h) 193 { 194 const void *raw_image_addr; 195 size_t raw_image_size = 0; 196 int ret; 197 198 /* 199 * The Excetpion Level must be EL3 to load and initialize 200 * the SEC Firmware. 201 */ 202 if (current_el() != 3) { 203 ret = -EACCES; 204 goto out; 205 } 206 207 #ifdef CONFIG_SYS_MEM_RESERVE_SECURE 208 /* 209 * The SEC Firmware must be stored in secure memory. 210 * Append SEC Firmware to secure mmu table. 211 */ 212 if (!(gd->arch.secure_ram & MEM_RESERVE_SECURE_MAINTAINED)) { 213 ret = -ENXIO; 214 goto out; 215 } 216 217 sec_firmware_addr = (gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK) + 218 gd->arch.tlb_size; 219 #else 220 #error "The CONFIG_SYS_MEM_RESERVE_SECURE must be defined when enabled SEC Firmware support" 221 #endif 222 223 /* Align SEC Firmware base address to 4K */ 224 sec_firmware_addr = (sec_firmware_addr + 0xfff) & ~0xfff; 225 debug("SEC Firmware: Load address: 0x%llx\n", 226 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 227 228 ret = sec_firmware_parse_image(sec_firmware_img, &raw_image_addr, 229 &raw_image_size); 230 if (ret) 231 goto out; 232 233 /* TODO: 234 * Check if the end addr of SEC Firmware has been extend the secure 235 * memory. 236 */ 237 238 /* Copy the secure firmware to secure memory */ 239 ret = sec_firmware_copy_image("SEC Firmware", (u64)raw_image_addr, 240 raw_image_size, sec_firmware_addr & 241 SEC_FIRMWARE_ADDR_MASK); 242 if (ret) 243 goto out; 244 245 /* 246 * Check if any loadable are present along with firmware image, if 247 * present load them. 248 */ 249 ret = sec_firmware_check_copy_loadable(sec_firmware_img, loadable_l, 250 loadable_h); 251 if (ret) 252 goto out; 253 254 sec_firmware_addr |= SEC_FIRMWARE_LOADED; 255 debug("SEC Firmware: Entry point: 0x%llx\n", 256 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 257 258 return 0; 259 260 out: 261 printf("SEC Firmware: error (%d)\n", ret); 262 sec_firmware_addr = 0; 263 264 return ret; 265 } 266 267 static int sec_firmware_entry(u32 *eret_hold_l, u32 *eret_hold_h) 268 { 269 const void *entry = (void *)(sec_firmware_addr & 270 SEC_FIRMWARE_ADDR_MASK); 271 272 return _sec_firmware_entry(entry, eret_hold_l, eret_hold_h); 273 } 274 275 /* Check the secure firmware FIT image */ 276 __weak bool sec_firmware_is_valid(const void *sec_firmware_img) 277 { 278 if (fdt_check_header(sec_firmware_img)) { 279 printf("SEC Firmware: Bad firmware image (not a FIT image)\n"); 280 return false; 281 } 282 283 if (!fit_check_format(sec_firmware_img)) { 284 printf("SEC Firmware: Bad firmware image (bad FIT header)\n"); 285 return false; 286 } 287 288 return true; 289 } 290 291 #ifdef CONFIG_SEC_FIRMWARE_ARMV8_PSCI 292 /* 293 * The PSCI_VERSION function is added from PSCI v0.2. When the PSCI 294 * v0.1 received this function, the NOT_SUPPORTED (0xffff_ffff) error 295 * number will be returned according to SMC Calling Conventions. But 296 * when getting the NOT_SUPPORTED error number, we cannot ensure if 297 * the PSCI version is v0.1 or other error occurred. So, PSCI v0.1 298 * won't be supported by this framework. 299 * And if the secure firmware isn't running, return NOT_SUPPORTED. 300 * 301 * The return value on success is PSCI version in format 302 * major[31:16]:minor[15:0]. 303 */ 304 unsigned int sec_firmware_support_psci_version(void) 305 { 306 if (current_el() == SEC_FIRMWARE_TARGET_EL) 307 return _sec_firmware_support_psci_version(); 308 309 return PSCI_INVALID_VER; 310 } 311 #endif 312 313 /* 314 * Check with sec_firmware if it supports random number generation 315 * via HW RNG 316 * 317 * The return value will be true if it is supported 318 */ 319 bool sec_firmware_support_hwrng(void) 320 { 321 uint8_t rand[8]; 322 if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) { 323 if (!sec_firmware_get_random(rand, 8)) 324 return true; 325 } 326 327 return false; 328 } 329 330 /* 331 * sec_firmware_get_random - Get a random number from SEC Firmware 332 * @rand: random number buffer to be filled 333 * @bytes: Number of bytes of random number to be supported 334 * @eret: -1 in case of error, 0 for success 335 */ 336 int sec_firmware_get_random(uint8_t *rand, int bytes) 337 { 338 unsigned long long num; 339 struct pt_regs regs; 340 int param1; 341 342 if (!bytes || bytes > 8) { 343 printf("Max Random bytes genration supported is 8\n"); 344 return -1; 345 } 346 #define SIP_RNG_64 0xC200FF11 347 regs.regs[0] = SIP_RNG_64; 348 349 if (bytes <= 4) 350 param1 = 0; 351 else 352 param1 = 1; 353 regs.regs[1] = param1; 354 355 smc_call(®s); 356 357 if (regs.regs[0]) 358 return -1; 359 360 num = regs.regs[1]; 361 memcpy(rand, &num, bytes); 362 363 return 0; 364 } 365 366 /* 367 * sec_firmware_init - Initialize the SEC Firmware 368 * @sec_firmware_img: the SEC Firmware image address 369 * @eret_hold_l: the address to hold exception return address low 370 * @eret_hold_h: the address to hold exception return address high 371 * @loadable_l: the address to hold loadable address low 372 * @loadable_h: the address to hold loadable address high 373 */ 374 int sec_firmware_init(const void *sec_firmware_img, 375 u32 *eret_hold_l, 376 u32 *eret_hold_h, 377 u32 *loadable_l, 378 u32 *loadable_h) 379 { 380 int ret; 381 382 if (!sec_firmware_is_valid(sec_firmware_img)) 383 return -EINVAL; 384 385 ret = sec_firmware_load_image(sec_firmware_img, loadable_l, 386 loadable_h); 387 if (ret) { 388 printf("SEC Firmware: Failed to load image\n"); 389 return ret; 390 } else if (sec_firmware_addr & SEC_FIRMWARE_LOADED) { 391 ret = sec_firmware_entry(eret_hold_l, eret_hold_h); 392 if (ret) { 393 printf("SEC Firmware: Failed to initialize\n"); 394 return ret; 395 } 396 } 397 398 debug("SEC Firmware: Return from SEC Firmware: current_el = %d\n", 399 current_el()); 400 401 /* 402 * The PE will be turned into target EL when returned from 403 * SEC Firmware. 404 */ 405 if (current_el() != SEC_FIRMWARE_TARGET_EL) 406 return -EACCES; 407 408 sec_firmware_addr |= SEC_FIRMWARE_RUNNING; 409 410 /* Set exception table and enable caches if it isn't EL3 */ 411 if (current_el() != 3) { 412 c_runtime_cpu_setup(); 413 enable_caches(); 414 } 415 416 return 0; 417 } 418 419 /* 420 * fdt_fix_kaslr - Add kalsr-seed node in Device tree 421 * @fdt: Device tree 422 * @eret: 0 in case of error, 1 for success 423 */ 424 int fdt_fixup_kaslr(void *fdt) 425 { 426 int nodeoffset; 427 int err, ret = 0; 428 u8 rand[8]; 429 430 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT) 431 /* Check if random seed generation is supported */ 432 if (sec_firmware_support_hwrng() == false) 433 return 0; 434 435 ret = sec_firmware_get_random(rand, 8); 436 if (ret < 0) { 437 printf("WARNING: No random number to set kaslr-seed\n"); 438 return 0; 439 } 440 441 err = fdt_check_header(fdt); 442 if (err < 0) { 443 printf("fdt_chosen: %s\n", fdt_strerror(err)); 444 return 0; 445 } 446 447 /* find or create "/chosen" node. */ 448 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 449 if (nodeoffset < 0) 450 return 0; 451 452 err = fdt_setprop(fdt, nodeoffset, "kaslr-seed", rand, 453 sizeof(rand)); 454 if (err < 0) { 455 printf("WARNING: can't set kaslr-seed %s.\n", 456 fdt_strerror(err)); 457 return 0; 458 } 459 ret = 1; 460 #endif 461 462 return ret; 463 } 464