Sheetal Tigadoli | ad0943e | 2019-12-18 19:44:43 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 - 2020 Broadcom |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <assert.h> |
| 8 | #include <stdint.h> |
| 9 | #include <string.h> |
| 10 | |
| 11 | #include <common/debug.h> |
| 12 | #include <lib/mmio.h> |
| 13 | #include <plat/common/platform.h> |
| 14 | #include <tools_share/tbbr_oid.h> |
| 15 | |
| 16 | #include <sbl_util.h> |
| 17 | #include <sotp.h> |
| 18 | |
| 19 | /* Weak definition may be overridden in specific platform */ |
| 20 | #pragma weak plat_match_rotpk |
| 21 | #pragma weak plat_get_nv_ctr |
| 22 | #pragma weak plat_set_nv_ctr |
| 23 | |
| 24 | /* SHA256 algorithm */ |
| 25 | #define SHA256_BYTES 32 |
| 26 | |
| 27 | /* ROTPK locations */ |
| 28 | #define ARM_ROTPK_REGS_ID 1 |
| 29 | #define ARM_ROTPK_DEVEL_RSA_ID 2 |
| 30 | #define BRCM_ROTPK_SOTP_RSA_ID 3 |
| 31 | |
| 32 | #if !ARM_ROTPK_LOCATION_ID |
| 33 | #error "ARM_ROTPK_LOCATION_ID not defined" |
| 34 | #endif |
| 35 | |
| 36 | static const unsigned char rotpk_hash_hdr[] = |
| 37 | "\x30\x31\x30\x0D\x06\x09\x60\x86\x48" |
| 38 | "\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20"; |
| 39 | static const unsigned int rotpk_hash_hdr_len = sizeof(rotpk_hash_hdr) - 1; |
| 40 | static unsigned char rotpk_hash_der[sizeof(rotpk_hash_hdr) - 1 + SHA256_BYTES]; |
| 41 | |
| 42 | #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| 43 | static const unsigned char arm_devel_rotpk_hash[] = |
| 44 | "\xB0\xF3\x82\x09\x12\x97\xD8\x3A" |
| 45 | "\x37\x7A\x72\x47\x1B\xEC\x32\x73" |
| 46 | "\xE9\x92\x32\xE2\x49\x59\xF6\x5E" |
| 47 | "\x8B\x4A\x4A\x46\xD8\x22\x9A\xDA"; |
| 48 | #endif |
| 49 | |
| 50 | #pragma weak plat_rotpk_hash |
| 51 | const unsigned char plat_rotpk_hash[] = |
| 52 | "\xdb\x06\x67\x95\x4f\x88\x2b\x88" |
| 53 | "\x49\xbf\x70\x3f\xde\x50\x4a\x96" |
| 54 | "\xd8\x17\x69\xd4\xa0\x6c\xba\xee" |
| 55 | "\x66\x3e\x71\x82\x2d\x95\x69\xe4"; |
| 56 | |
| 57 | #pragma weak rom_slice |
| 58 | const unsigned char rom_slice[] = |
| 59 | "\x77\x06\xbc\x98\x40\xbe\xfd\xab" |
| 60 | "\x60\x4b\x74\x3c\x9a\xb3\x80\x75" |
| 61 | "\x39\xb6\xda\x27\x07\x2e\x5b\xbf" |
| 62 | "\x5c\x47\x91\xc9\x95\x26\x26\x0c"; |
| 63 | |
| 64 | #if (ARM_ROTPK_LOCATION_ID == BRCM_ROTPK_SOTP_RSA_ID) |
| 65 | static int plat_is_trusted_boot(void) |
| 66 | { |
| 67 | uint64_t section3_row0_data; |
| 68 | |
| 69 | section3_row0_data = sotp_mem_read(SOTP_DEVICE_SECURE_CFG0_ROW, 0); |
| 70 | |
| 71 | if ((section3_row0_data & SOTP_DEVICE_SECURE_CFG0_AB_MASK) == 0) { |
| 72 | INFO("NOT AB\n"); |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | INFO("AB\n"); |
| 77 | return TRUSTED_BOARD_BOOT; |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * FAST AUTH is enabled if all following conditions are met: |
| 82 | * - AB part |
| 83 | * - SOTP.DEV != 0 |
| 84 | * - SOTP.CID != 0 |
| 85 | * - SOTP.ENC_DEV_TYPE = ENC_AB_DEV |
| 86 | * - Manuf_debug strap set high |
| 87 | */ |
| 88 | static int plat_fast_auth_enabled(void) |
| 89 | { |
| 90 | uint32_t chip_state; |
| 91 | uint64_t section3_row0_data; |
| 92 | uint64_t section3_row1_data; |
| 93 | |
| 94 | section3_row0_data = |
| 95 | sotp_mem_read(SOTP_DEVICE_SECURE_CFG0_ROW, 0); |
| 96 | section3_row1_data = |
| 97 | sotp_mem_read(SOTP_DEVICE_SECURE_CFG1_ROW, 0); |
| 98 | |
| 99 | chip_state = mmio_read_32(SOTP_REGS_SOTP_CHIP_STATES); |
| 100 | |
| 101 | if (plat_is_trusted_boot() && |
| 102 | (section3_row0_data & SOTP_DEVICE_SECURE_CFG0_DEV_MASK) && |
| 103 | (section3_row0_data & SOTP_DEVICE_SECURE_CFG0_CID_MASK) && |
| 104 | ((section3_row1_data & SOTP_ENC_DEV_TYPE_MASK) == |
| 105 | SOTP_ENC_DEV_TYPE_AB_DEV) && |
| 106 | (chip_state & SOTP_CHIP_STATES_MANU_DEBUG_MASK)) |
| 107 | return 1; |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | #endif |
| 112 | |
| 113 | /* |
| 114 | * Return the ROTPK hash in the following ASN.1 structure in DER format: |
| 115 | * |
| 116 | * AlgorithmIdentifier ::= SEQUENCE { |
| 117 | * algorithm OBJECT IDENTIFIER, |
| 118 | * parameters ANY DEFINED BY algorithm OPTIONAL |
| 119 | * } |
| 120 | * |
| 121 | * DigestInfo ::= SEQUENCE { |
| 122 | * digestAlgorithm AlgorithmIdentifier, |
| 123 | * digest OCTET STRING |
| 124 | * } |
| 125 | */ |
| 126 | int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len, |
| 127 | unsigned int *flags) |
| 128 | { |
| 129 | uint8_t *dst; |
| 130 | |
| 131 | assert(key_ptr != NULL); |
| 132 | assert(key_len != NULL); |
| 133 | assert(flags != NULL); |
| 134 | |
| 135 | *flags = 0; |
| 136 | |
| 137 | /* Copy the DER header */ |
| 138 | memcpy(rotpk_hash_der, rotpk_hash_hdr, rotpk_hash_hdr_len); |
| 139 | dst = (uint8_t *)&rotpk_hash_der[rotpk_hash_hdr_len]; |
| 140 | |
| 141 | #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| 142 | memcpy(dst, arm_devel_rotpk_hash, SHA256_BYTES); |
| 143 | #elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID) |
| 144 | uint32_t *src, tmp; |
| 145 | unsigned int words, i; |
| 146 | |
| 147 | /* |
| 148 | * Append the hash from Trusted Root-Key Storage registers. The hash has |
| 149 | * not been written linearly into the registers, so we have to do a bit |
| 150 | * of byte swapping: |
| 151 | * |
| 152 | * 0x00 0x04 0x08 0x0C 0x10 0x14 0x18 0x1C |
| 153 | * +---------------------------------------------------------------+ |
| 154 | * | Reg0 | Reg1 | Reg2 | Reg3 | Reg4 | Reg5 | Reg6 | Reg7 | |
| 155 | * +---------------------------------------------------------------+ |
| 156 | * | ... ... | | ... ... | |
| 157 | * | +--------------------+ | +-------+ |
| 158 | * | | | | |
| 159 | * +----------------------------+ +----------------------------+ |
| 160 | * | | | | |
| 161 | * +-------+ | +--------------------+ | |
| 162 | * | | | | |
| 163 | * v v v v |
| 164 | * +---------------------------------------------------------------+ |
| 165 | * | | | |
| 166 | * +---------------------------------------------------------------+ |
| 167 | * 0 15 16 31 |
| 168 | * |
| 169 | * Additionally, we have to access the registers in 32-bit words |
| 170 | */ |
| 171 | words = SHA256_BYTES >> 3; |
| 172 | |
| 173 | /* Swap bytes 0-15 (first four registers) */ |
| 174 | src = (uint32_t *)TZ_PUB_KEY_HASH_BASE; |
| 175 | for (i = 0 ; i < words ; i++) { |
| 176 | tmp = src[words - 1 - i]; |
| 177 | /* Words are read in little endian */ |
| 178 | *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| 179 | *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| 180 | *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| 181 | *dst++ = (uint8_t)(tmp & 0xFF); |
| 182 | } |
| 183 | |
| 184 | /* Swap bytes 16-31 (last four registers) */ |
| 185 | src = (uint32_t *)(TZ_PUB_KEY_HASH_BASE + SHA256_BYTES / 2); |
| 186 | for (i = 0 ; i < words ; i++) { |
| 187 | tmp = src[words - 1 - i]; |
| 188 | *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| 189 | *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| 190 | *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| 191 | *dst++ = (uint8_t)(tmp & 0xFF); |
| 192 | } |
| 193 | #elif (ARM_ROTPK_LOCATION_ID == BRCM_ROTPK_SOTP_RSA_ID) |
| 194 | { |
| 195 | int i; |
| 196 | int ret = -1; |
| 197 | |
| 198 | /* |
| 199 | * In non-AB mode, we do not read the key. |
| 200 | * In AB mode: |
| 201 | * - The Dauth is in BL11 if SBL is enabled |
| 202 | * - The Dauth is in SOTP if SBL is disabled. |
| 203 | */ |
| 204 | if (plat_is_trusted_boot() == 0) { |
| 205 | |
| 206 | INFO("NON-AB: Do not read DAUTH!\n"); |
| 207 | *flags = ROTPK_NOT_DEPLOYED; |
| 208 | ret = 0; |
| 209 | |
| 210 | } else if ((sbl_status() == SBL_ENABLED) && |
| 211 | (mmio_read_32(BL11_DAUTH_BASE) == BL11_DAUTH_ID)) { |
| 212 | |
| 213 | /* Read hash from BL11 */ |
| 214 | INFO("readKeys (DAUTH) from BL11\n"); |
| 215 | |
| 216 | memcpy(dst, |
| 217 | (void *)(BL11_DAUTH_BASE + sizeof(uint32_t)), |
| 218 | SHA256_BYTES); |
| 219 | |
| 220 | for (i = 0; i < SHA256_BYTES; i++) |
| 221 | if (dst[i] != 0) |
| 222 | break; |
| 223 | |
| 224 | if (i >= SHA256_BYTES) |
| 225 | ERROR("Hash not valid from BL11\n"); |
| 226 | else |
| 227 | ret = 0; |
| 228 | |
| 229 | } else if (sotp_key_erased()) { |
| 230 | |
| 231 | memcpy(dst, plat_rotpk_hash, SHA256_BYTES); |
| 232 | |
| 233 | INFO("SOTP erased, Use internal key hash.\n"); |
| 234 | ret = 0; |
| 235 | |
| 236 | } else if (plat_fast_auth_enabled()) { |
| 237 | |
| 238 | INFO("AB DEV: FAST AUTH!\n"); |
| 239 | *flags = ROTPK_NOT_DEPLOYED; |
| 240 | ret = 0; |
| 241 | |
| 242 | } else if (!(mmio_read_32(SOTP_STATUS_1) & SOTP_DAUTH_ECC_ERROR_MASK)) { |
| 243 | |
| 244 | /* Read hash from SOTP */ |
| 245 | ret = sotp_read_key(dst, |
| 246 | SHA256_BYTES, |
| 247 | SOTP_DAUTH_ROW, |
| 248 | SOTP_K_HMAC_ROW-1); |
| 249 | |
| 250 | INFO("sotp_read_key (DAUTH): %i\n", ret); |
| 251 | |
| 252 | } else { |
| 253 | |
| 254 | uint64_t row_data; |
| 255 | uint32_t k; |
| 256 | |
| 257 | for (k = 0; k < (SOTP_K_HMAC_ROW - SOTP_DAUTH_ROW); k++) { |
| 258 | row_data = sotp_mem_read(SOTP_DAUTH_ROW + k, |
| 259 | SOTP_ROW_NO_ECC); |
| 260 | |
| 261 | if (row_data != 0) |
| 262 | break; |
| 263 | } |
| 264 | |
| 265 | if (k == (SOTP_K_HMAC_ROW - SOTP_DAUTH_ROW)) { |
| 266 | INFO("SOTP NOT PROGRAMMED: Do not use DAUTH!\n"); |
| 267 | |
| 268 | if (sotp_mem_read(SOTP_ATF2_CFG_ROW_ID, |
| 269 | SOTP_ROW_NO_ECC) & SOTP_ROMKEY_MASK) { |
| 270 | memcpy(dst, plat_rotpk_hash, SHA256_BYTES); |
| 271 | |
| 272 | INFO("Use internal key hash.\n"); |
| 273 | ret = 0; |
| 274 | } else { |
| 275 | *flags = ROTPK_NOT_DEPLOYED; |
| 276 | ret = 0; |
| 277 | } |
| 278 | } else { |
| 279 | INFO("No hash found in SOTP\n"); |
| 280 | } |
| 281 | } |
| 282 | if (ret) |
| 283 | return ret; |
| 284 | } |
| 285 | #endif |
| 286 | |
| 287 | *key_ptr = (void *)rotpk_hash_der; |
| 288 | *key_len = (unsigned int)sizeof(rotpk_hash_der); |
| 289 | *flags |= ROTPK_IS_HASH; |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | #define SOTP_NUM_BITS_PER_ROW 41 |
| 295 | #define SOTP_NVCTR_ROW_ALL_ONES 0x1ffffffffff |
| 296 | #define SOTP_NVCTR_TRUSTED_IN_USE \ |
| 297 | ((uint64_t)0x3 << (SOTP_NUM_BITS_PER_ROW-2)) |
| 298 | #define SOTP_NVCTR_NON_TRUSTED_IN_USE ((uint64_t)0x3) |
| 299 | #define SOTP_NVCTR_TRUSTED_NEAR_END SOTP_NVCTR_NON_TRUSTED_IN_USE |
| 300 | #define SOTP_NVCTR_NON_TRUSTED_NEAR_END SOTP_NVCTR_TRUSTED_IN_USE |
| 301 | |
| 302 | #define SOTP_NVCTR_ROW_START 64 |
| 303 | #define SOTP_NVCTR_ROW_END 75 |
| 304 | |
| 305 | /* |
| 306 | * SOTP NVCTR are stored in section 10 of SOTP (rows 64-75). |
| 307 | * Each row of SOTP is 41 bits. |
| 308 | * NVCTR's are stored in a bitstream format. |
| 309 | * We are tolerant to consecutive bit errors. |
| 310 | * Trusted NVCTR starts at the top of row 64 in bitstream format. |
| 311 | * Non Trusted NVCTR starts at the bottom of row 75 in reverse bitstream. |
| 312 | * Each row can only be used by 1 of the 2 counters. This is determined |
| 313 | * by 2 zeros remaining at the beginning or end of the last available row. |
| 314 | * If one counter has already starting using a row, the other will be |
| 315 | * prevent from writing to that row. |
| 316 | * |
| 317 | * Example counter values for SOTP programmed below: |
| 318 | * Trusted Counter (rows64-69) = 5 * 41 + 40 = 245 |
| 319 | * NonTrusted Counter (row75-71) = 3 * 41 + 4 = 127 |
| 320 | * 40 39 38 37 36 ..... 5 4 3 2 1 0 |
| 321 | * row 64 1 1 1 1 1 1 1 1 1 1 1 |
| 322 | * row 65 1 1 1 1 1 1 1 1 1 1 1 |
| 323 | * row 66 1 1 1 1 1 1 1 1 1 1 1 |
| 324 | * row 67 1 1 1 1 1 1 1 1 1 1 1 |
| 325 | * row 68 1 1 1 1 1 1 1 1 1 1 1 |
| 326 | * row 69 1 1 1 1 1 1 1 1 1 1 0 |
| 327 | * row 71 0 0 0 0 0 0 0 0 0 0 0 |
| 328 | * row 71 0 0 0 0 0 0 0 0 0 0 0 |
| 329 | * row 71 0 0 0 0 0 0 0 1 1 1 1 |
| 330 | * row 73 1 1 1 1 1 1 1 1 1 1 1 |
| 331 | * row 74 1 1 1 1 1 1 1 1 1 1 1 |
| 332 | * row 75 1 1 1 1 1 1 1 1 1 1 1 |
| 333 | * |
| 334 | */ |
| 335 | |
| 336 | #if (DEBUG == 1) |
| 337 | /* |
| 338 | * Dump sotp rows |
| 339 | */ |
| 340 | void sotp_dump_rows(uint32_t start_row, uint32_t end_row) |
| 341 | { |
| 342 | int32_t rownum; |
| 343 | uint64_t rowdata; |
| 344 | |
| 345 | for (rownum = start_row; rownum <= end_row; rownum++) { |
| 346 | rowdata = sotp_mem_read(rownum, SOTP_ROW_NO_ECC); |
| 347 | INFO("%d 0x%llx\n", rownum, rowdata); |
| 348 | } |
| 349 | } |
| 350 | #endif |
| 351 | |
| 352 | /* |
| 353 | * Get SOTP Trusted nvctr |
| 354 | */ |
| 355 | unsigned int sotp_get_trusted_nvctr(void) |
| 356 | { |
| 357 | uint64_t rowdata; |
| 358 | uint64_t nextrowdata; |
| 359 | uint32_t rownum; |
| 360 | unsigned int nvctr; |
| 361 | |
| 362 | rownum = SOTP_NVCTR_ROW_START; |
| 363 | nvctr = SOTP_NUM_BITS_PER_ROW; |
| 364 | |
| 365 | /* |
| 366 | * Determine what row has last valid data for trusted ctr |
| 367 | */ |
| 368 | rowdata = sotp_mem_read(rownum, SOTP_ROW_NO_ECC); |
| 369 | while ((rowdata & SOTP_NVCTR_TRUSTED_IN_USE) && |
| 370 | (rowdata & SOTP_NVCTR_TRUSTED_NEAR_END) && |
| 371 | (rownum < SOTP_NVCTR_ROW_END)) { |
| 372 | /* |
| 373 | * Current row in use and has data in last 2 bits as well. |
| 374 | * Check if next row also has data for this counter |
| 375 | */ |
| 376 | nextrowdata = sotp_mem_read(rownum+1, SOTP_ROW_NO_ECC); |
| 377 | if (nextrowdata & SOTP_NVCTR_TRUSTED_IN_USE) { |
| 378 | /* Next row also has data so increment rownum */ |
| 379 | rownum++; |
| 380 | nvctr += SOTP_NUM_BITS_PER_ROW; |
| 381 | rowdata = nextrowdata; |
| 382 | } else { |
| 383 | /* Next row does not have data */ |
| 384 | break; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | if (rowdata & SOTP_NVCTR_TRUSTED_IN_USE) { |
| 389 | while ((rowdata & 0x1) == 0) { |
| 390 | nvctr--; |
| 391 | rowdata >>= 1; |
| 392 | } |
| 393 | } else |
| 394 | nvctr -= SOTP_NUM_BITS_PER_ROW; |
| 395 | |
| 396 | INFO("CTR %i\n", nvctr); |
| 397 | return nvctr; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Get SOTP NonTrusted nvctr |
| 402 | */ |
| 403 | unsigned int sotp_get_nontrusted_nvctr(void) |
| 404 | { |
| 405 | uint64_t rowdata; |
| 406 | uint64_t nextrowdata; |
| 407 | uint32_t rownum; |
| 408 | unsigned int nvctr; |
| 409 | |
| 410 | nvctr = SOTP_NUM_BITS_PER_ROW; |
| 411 | rownum = SOTP_NVCTR_ROW_END; |
| 412 | |
| 413 | /* |
| 414 | * Determine what row has last valid data for nontrusted ctr |
| 415 | */ |
| 416 | rowdata = sotp_mem_read(rownum, SOTP_ROW_NO_ECC); |
| 417 | while ((rowdata & SOTP_NVCTR_NON_TRUSTED_NEAR_END) && |
| 418 | (rowdata & SOTP_NVCTR_NON_TRUSTED_IN_USE) && |
| 419 | (rownum > SOTP_NVCTR_ROW_START)) { |
| 420 | /* |
| 421 | * Current row in use and has data in last 2 bits as well. |
| 422 | * Check if next row also has data for this counter |
| 423 | */ |
| 424 | nextrowdata = sotp_mem_read(rownum-1, SOTP_ROW_NO_ECC); |
| 425 | if (nextrowdata & SOTP_NVCTR_NON_TRUSTED_IN_USE) { |
| 426 | /* Next row also has data so decrement rownum */ |
| 427 | rownum--; |
| 428 | nvctr += SOTP_NUM_BITS_PER_ROW; |
| 429 | rowdata = nextrowdata; |
| 430 | } else { |
| 431 | /* Next row does not have data */ |
| 432 | break; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | if (rowdata & SOTP_NVCTR_NON_TRUSTED_IN_USE) { |
| 437 | while ((rowdata & ((uint64_t)0x1 << (SOTP_NUM_BITS_PER_ROW-1))) |
| 438 | == |
| 439 | 0) { |
| 440 | nvctr--; |
| 441 | rowdata <<= 1; |
| 442 | } |
| 443 | } else |
| 444 | nvctr -= SOTP_NUM_BITS_PER_ROW; |
| 445 | |
| 446 | INFO("NCTR %i\n", nvctr); |
| 447 | return nvctr; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Set SOTP Trusted nvctr |
| 452 | */ |
| 453 | int sotp_set_trusted_nvctr(unsigned int nvctr) |
| 454 | { |
| 455 | int numrows_available; |
| 456 | uint32_t nontrusted_rownum; |
| 457 | uint32_t trusted_rownum; |
| 458 | uint64_t rowdata; |
| 459 | unsigned int maxnvctr; |
| 460 | |
| 461 | /* |
| 462 | * Read SOTP to find out how many rows are used by the |
| 463 | * NON Trusted nvctr |
| 464 | */ |
| 465 | nontrusted_rownum = SOTP_NVCTR_ROW_END; |
| 466 | do { |
| 467 | rowdata = sotp_mem_read(nontrusted_rownum, SOTP_ROW_NO_ECC); |
| 468 | if (rowdata & SOTP_NVCTR_NON_TRUSTED_IN_USE) |
| 469 | nontrusted_rownum--; |
| 470 | else |
| 471 | break; |
| 472 | } while (nontrusted_rownum >= SOTP_NVCTR_ROW_START); |
| 473 | |
| 474 | /* |
| 475 | * Calculate maximum value we can have for nvctr based on |
| 476 | * number of available rows. |
| 477 | */ |
| 478 | numrows_available = nontrusted_rownum - SOTP_NVCTR_ROW_START + 1; |
| 479 | maxnvctr = numrows_available * SOTP_NUM_BITS_PER_ROW; |
| 480 | if (maxnvctr) { |
| 481 | /* |
| 482 | * Last 2 bits of counter can't be written or it will |
| 483 | * overflow with nontrusted counter |
| 484 | */ |
| 485 | maxnvctr -= 2; |
| 486 | } |
| 487 | |
| 488 | if (nvctr > maxnvctr) { |
| 489 | /* Error - not enough room */ |
| 490 | WARN("tctr not set\n"); |
| 491 | return 1; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * It is safe to write the nvctr, fill all 1's up to the |
| 496 | * last row and then fill the last row with partial bitstream |
| 497 | */ |
| 498 | trusted_rownum = SOTP_NVCTR_ROW_START; |
| 499 | rowdata = SOTP_NVCTR_ROW_ALL_ONES; |
| 500 | |
| 501 | while (nvctr >= SOTP_NUM_BITS_PER_ROW) { |
| 502 | sotp_mem_write(trusted_rownum, SOTP_ROW_NO_ECC, rowdata); |
| 503 | nvctr -= SOTP_NUM_BITS_PER_ROW; |
| 504 | trusted_rownum++; |
| 505 | } |
| 506 | rowdata <<= (SOTP_NUM_BITS_PER_ROW - nvctr); |
| 507 | sotp_mem_write(trusted_rownum, SOTP_ROW_NO_ECC, rowdata); |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Set SOTP NonTrusted nvctr |
| 513 | */ |
| 514 | int sotp_set_nontrusted_nvctr(unsigned int nvctr) |
| 515 | { |
| 516 | int numrows_available; |
| 517 | uint32_t nontrusted_rownum; |
| 518 | uint32_t trusted_rownum; |
| 519 | uint64_t rowdata; |
| 520 | unsigned int maxnvctr; |
| 521 | |
| 522 | /* |
| 523 | * Read SOTP to find out how many rows are used by the |
| 524 | * Trusted nvctr |
| 525 | */ |
| 526 | trusted_rownum = SOTP_NVCTR_ROW_START; |
| 527 | do { |
| 528 | rowdata = sotp_mem_read(trusted_rownum, SOTP_ROW_NO_ECC); |
| 529 | if (rowdata & SOTP_NVCTR_TRUSTED_IN_USE) |
| 530 | trusted_rownum++; |
| 531 | else |
| 532 | break; |
| 533 | } while (trusted_rownum <= SOTP_NVCTR_ROW_END); |
| 534 | |
| 535 | /* |
| 536 | * Calculate maximum value we can have for nvctr based on |
| 537 | * number of available rows. |
| 538 | */ |
| 539 | numrows_available = SOTP_NVCTR_ROW_END - trusted_rownum + 1; |
| 540 | maxnvctr = numrows_available * SOTP_NUM_BITS_PER_ROW; |
| 541 | if (maxnvctr) { |
| 542 | /* |
| 543 | * Last 2 bits of counter can't be written or it will |
| 544 | * overflow with nontrusted counter |
| 545 | */ |
| 546 | maxnvctr -= 2; |
| 547 | } |
| 548 | |
| 549 | if (nvctr > maxnvctr) { |
| 550 | /* Error - not enough room */ |
| 551 | WARN("nctr not set\n"); |
| 552 | return 1; |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * It is safe to write the nvctr, fill all 1's up to the |
| 557 | * last row and then fill the last row with partial bitstream |
| 558 | */ |
| 559 | nontrusted_rownum = SOTP_NVCTR_ROW_END; |
| 560 | rowdata = SOTP_NVCTR_ROW_ALL_ONES; |
| 561 | |
| 562 | while (nvctr >= SOTP_NUM_BITS_PER_ROW) { |
| 563 | sotp_mem_write(nontrusted_rownum, SOTP_ROW_NO_ECC, rowdata); |
| 564 | nvctr -= SOTP_NUM_BITS_PER_ROW; |
| 565 | nontrusted_rownum--; |
| 566 | } |
| 567 | rowdata >>= (SOTP_NUM_BITS_PER_ROW - nvctr); |
| 568 | sotp_mem_write(nontrusted_rownum, SOTP_ROW_NO_ECC, rowdata); |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Return the non-volatile counter value stored in the platform. The cookie |
| 574 | * will contain the OID of the counter in the certificate. |
| 575 | * |
| 576 | * Return: 0 = success, Otherwise = error |
| 577 | */ |
| 578 | int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr) |
| 579 | { |
| 580 | const char *oid; |
| 581 | |
| 582 | assert(cookie != NULL); |
| 583 | assert(nv_ctr != NULL); |
| 584 | |
| 585 | *nv_ctr = 0; |
| 586 | if ((sotp_mem_read(SOTP_ATF_CFG_ROW_ID, SOTP_ROW_NO_ECC) & |
| 587 | SOTP_ATF_NVCOUNTER_ENABLE_MASK)) { |
| 588 | oid = (const char *)cookie; |
| 589 | if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) |
| 590 | *nv_ctr = sotp_get_trusted_nvctr(); |
| 591 | else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) |
| 592 | *nv_ctr = sotp_get_nontrusted_nvctr(); |
| 593 | else |
| 594 | return 1; |
| 595 | } |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Store a new non-volatile counter value. |
| 601 | * |
| 602 | * Return: 0 = success, Otherwise = error |
| 603 | */ |
| 604 | int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr) |
| 605 | { |
| 606 | const char *oid; |
| 607 | |
| 608 | if (sotp_mem_read(SOTP_ATF_CFG_ROW_ID, SOTP_ROW_NO_ECC) & |
| 609 | SOTP_ATF_NVCOUNTER_ENABLE_MASK) { |
| 610 | INFO("set CTR %i\n", nv_ctr); |
| 611 | oid = (const char *)cookie; |
| 612 | if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) |
| 613 | return sotp_set_trusted_nvctr(nv_ctr); |
| 614 | else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) |
| 615 | return sotp_set_nontrusted_nvctr(nv_ctr); |
| 616 | return 1; |
| 617 | } |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size) |
| 622 | { |
| 623 | return get_mbedtls_heap_helper(heap_addr, heap_size); |
| 624 | } |