1 /* 2 * 3 * Common security related functions for OMAP devices 4 * 5 * (C) Copyright 2016-2017 6 * Texas Instruments, <www.ti.com> 7 * 8 * Daniel Allred <d-allred@ti.com> 9 * Andreas Dannenberg <dannenberg@ti.com> 10 * Harinarayan Bhatta <harinarayan@ti.com> 11 * Andrew F. Davis <afd@ti.com> 12 * 13 * SPDX-License-Identifier: GPL-2.0+ 14 */ 15 16 #include <common.h> 17 #include <stdarg.h> 18 19 #include <asm/arch/sys_proto.h> 20 #include <asm/cache.h> 21 #include <asm/omap_common.h> 22 #include <asm/omap_sec_common.h> 23 #include <asm/spl.h> 24 #include <asm/ti-common/sys_proto.h> 25 #include <mapmem.h> 26 #include <spl.h> 27 #include <tee/optee.h> 28 29 /* Index for signature verify ROM API */ 30 #ifdef CONFIG_AM33XX 31 #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000C) 32 #else 33 #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000E) 34 #endif 35 36 /* Index for signature PPA-based TI HAL APIs */ 37 #define PPA_HAL_SERVICES_START_INDEX (0x200) 38 #define PPA_SERV_HAL_TEE_LOAD_MASTER (PPA_HAL_SERVICES_START_INDEX + 23) 39 #define PPA_SERV_HAL_TEE_LOAD_SLAVE (PPA_HAL_SERVICES_START_INDEX + 24) 40 #define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25) 41 #define PPA_SERV_HAL_SETUP_EMIF_FW_REGION (PPA_HAL_SERVICES_START_INDEX + 26) 42 #define PPA_SERV_HAL_LOCK_EMIF_FW (PPA_HAL_SERVICES_START_INDEX + 27) 43 44 /* Offset of header size if image is signed as ISW */ 45 #define HEADER_SIZE_OFFSET (0x6D) 46 47 int tee_loaded = 0; 48 49 /* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */ 50 struct ppa_tee_load_info { 51 u32 tee_sec_mem_start; /* Physical start address reserved for TEE */ 52 u32 tee_sec_mem_size; /* Size of the memory reserved for TEE */ 53 u32 tee_cert_start; /* Address where signed TEE binary is loaded */ 54 u32 tee_cert_size; /* Size of TEE certificate (signed binary) */ 55 u32 tee_jump_addr; /* Address to jump to start TEE execution */ 56 u32 tee_arg0; /* argument to TEE jump function, in r0 */ 57 }; 58 59 static uint32_t secure_rom_call_args[5] __aligned(ARCH_DMA_MINALIGN); 60 61 u32 secure_rom_call(u32 service, u32 proc_id, u32 flag, ...) 62 { 63 int i; 64 u32 num_args; 65 va_list ap; 66 67 va_start(ap, flag); 68 69 num_args = va_arg(ap, u32); 70 71 if (num_args > 4) { 72 va_end(ap); 73 return 1; 74 } 75 76 /* Copy args to aligned args structure */ 77 for (i = 0; i < num_args; i++) 78 secure_rom_call_args[i + 1] = va_arg(ap, u32); 79 80 secure_rom_call_args[0] = num_args; 81 82 va_end(ap); 83 84 /* if data cache is enabled, flush the aligned args structure */ 85 flush_dcache_range( 86 (unsigned int)&secure_rom_call_args[0], 87 (unsigned int)&secure_rom_call_args[0] + 88 roundup(sizeof(secure_rom_call_args), ARCH_DMA_MINALIGN)); 89 90 return omap_smc_sec(service, proc_id, flag, secure_rom_call_args); 91 } 92 93 static u32 find_sig_start(char *image, size_t size) 94 { 95 char *image_end = image + size; 96 char *sig_start_magic = "CERT_"; 97 int magic_str_len = strlen(sig_start_magic); 98 char *ch; 99 100 while (--image_end > image) { 101 if (*image_end == '_') { 102 ch = image_end - magic_str_len + 1; 103 if (!strncmp(ch, sig_start_magic, magic_str_len)) 104 return (u32)ch; 105 } 106 } 107 return 0; 108 } 109 110 int secure_boot_verify_image(void **image, size_t *size) 111 { 112 int result = 1; 113 u32 cert_addr, sig_addr; 114 size_t cert_size; 115 116 /* Perform cache writeback on input buffer */ 117 flush_dcache_range( 118 rounddown((u32)*image, ARCH_DMA_MINALIGN), 119 roundup((u32)*image + *size, ARCH_DMA_MINALIGN)); 120 121 cert_addr = (uint32_t)*image; 122 sig_addr = find_sig_start((char *)*image, *size); 123 124 if (sig_addr == 0) { 125 printf("No signature found in image!\n"); 126 result = 1; 127 goto auth_exit; 128 } 129 130 *size = sig_addr - cert_addr; /* Subtract out the signature size */ 131 /* Subtract header if present */ 132 if (strncmp((char *)sig_addr, "CERT_ISW_", 9) == 0) 133 *size = ((u32 *)*image)[HEADER_SIZE_OFFSET]; 134 cert_size = *size; 135 136 /* Check if image load address is 32-bit aligned */ 137 if (!IS_ALIGNED(cert_addr, 4)) { 138 printf("Image is not 4-byte aligned!\n"); 139 result = 1; 140 goto auth_exit; 141 } 142 143 /* Image size also should be multiple of 4 */ 144 if (!IS_ALIGNED(cert_size, 4)) { 145 printf("Image size is not 4-byte aligned!\n"); 146 result = 1; 147 goto auth_exit; 148 } 149 150 /* Call ROM HAL API to verify certificate signature */ 151 debug("%s: load_addr = %x, size = %x, sig_addr = %x\n", __func__, 152 cert_addr, cert_size, sig_addr); 153 154 result = secure_rom_call( 155 API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX, 0, 0, 156 4, cert_addr, cert_size, sig_addr, 0xFFFFFFFF); 157 158 /* Perform cache writeback on output buffer */ 159 flush_dcache_range( 160 rounddown((u32)*image, ARCH_DMA_MINALIGN), 161 roundup((u32)*image + *size, ARCH_DMA_MINALIGN)); 162 163 auth_exit: 164 if (result != 0) { 165 printf("Authentication failed!\n"); 166 printf("Return Value = %08X\n", result); 167 hang(); 168 } 169 170 /* 171 * Output notification of successful authentication as well the name of 172 * the signing certificate used to re-assure the user that the secure 173 * code is being processed as expected. However suppress any such log 174 * output in case of building for SPL and booting via YMODEM. This is 175 * done to avoid disturbing the YMODEM serial protocol transactions. 176 */ 177 if (!(IS_ENABLED(CONFIG_SPL_BUILD) && 178 IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) && 179 spl_boot_device() == BOOT_DEVICE_UART)) 180 printf("Authentication passed: %s\n", (char *)sig_addr); 181 182 return result; 183 } 184 185 u32 get_sec_mem_start(void) 186 { 187 u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START; 188 u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE; 189 /* 190 * Total reserved region is all contiguous with protected 191 * region coming first, followed by the non-secure region. 192 * If 0x0 start address is given, we simply put the reserved 193 * region at the end of the external DRAM. 194 */ 195 if (sec_mem_start == 0) 196 sec_mem_start = 197 (CONFIG_SYS_SDRAM_BASE + ( 198 #if defined(CONFIG_OMAP54XX) 199 omap_sdram_size() 200 #else 201 get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, 202 CONFIG_MAX_RAM_BANK_SIZE) 203 #endif 204 - sec_mem_size)); 205 return sec_mem_start; 206 } 207 208 int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr, 209 uint32_t size, uint32_t access_perm, 210 uint32_t initiator_perm) 211 { 212 int result = 1; 213 214 /* 215 * Call PPA HAL API to do any other general firewall 216 * configuration for regions 1-6 of the EMIF firewall. 217 */ 218 debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__, 219 region_num, start_addr, size); 220 221 result = secure_rom_call( 222 PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4, 223 (start_addr & 0xFFFFFFF0) | (region_num & 0x0F), 224 size, access_perm, initiator_perm); 225 226 if (result != 0) { 227 puts("Secure EMIF Firewall Setup failed!\n"); 228 debug("Return Value = %x\n", result); 229 } 230 231 return result; 232 } 233 234 #if (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE < \ 235 CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE) 236 #error "TI Secure EMIF: Protected size cannot be larger than total size." 237 #endif 238 int secure_emif_reserve(void) 239 { 240 int result = 1; 241 u32 sec_mem_start = get_sec_mem_start(); 242 u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE; 243 244 /* If there is no protected region, there is no reservation to make */ 245 if (sec_prot_size == 0) 246 return 0; 247 248 /* 249 * Call PPA HAL API to reserve a chunk of EMIF SDRAM 250 * for secure world use. This region should be carved out 251 * from use by any public code. EMIF firewall region 7 252 * will be used to protect this block of memory. 253 */ 254 result = secure_rom_call( 255 PPA_SERV_HAL_SETUP_SEC_RESVD_REGION, 256 0, 0, 2, sec_mem_start, sec_prot_size); 257 258 if (result != 0) { 259 puts("SDRAM Firewall: Secure memory reservation failed!\n"); 260 debug("Return Value = %x\n", result); 261 } 262 263 return result; 264 } 265 266 int secure_emif_firewall_lock(void) 267 { 268 int result = 1; 269 270 /* 271 * Call PPA HAL API to lock the EMIF firewall configurations. 272 * After this API is called, none of the PPA HAL APIs for 273 * configuring the EMIF firewalls will be usable again (that 274 * is, calls to those APIs will return failure and have no 275 * effect). 276 */ 277 278 result = secure_rom_call( 279 PPA_SERV_HAL_LOCK_EMIF_FW, 280 0, 0, 0); 281 282 if (result != 0) { 283 puts("Secure EMIF Firewall Lock failed!\n"); 284 debug("Return Value = %x\n", result); 285 } 286 287 return result; 288 } 289 290 static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN); 291 292 int secure_tee_install(u32 addr) 293 { 294 struct optee_header *hdr; 295 void *loadptr; 296 u32 tee_file_size; 297 u32 sec_mem_start = get_sec_mem_start(); 298 const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE; 299 u32 ret; 300 301 /* If there is no protected region, there is no place to put the TEE */ 302 if (size == 0) { 303 printf("Error loading TEE, no protected memory region available\n"); 304 return -ENOBUFS; 305 } 306 307 hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header)); 308 /* 280 bytes = size of signature */ 309 tee_file_size = hdr->init_size + hdr->paged_size + 310 sizeof(struct optee_header) + 280; 311 312 if ((hdr->magic != OPTEE_MAGIC) || 313 (hdr->version != OPTEE_VERSION) || 314 (tee_file_size > size)) { 315 printf("Error in TEE header. Check firewall and TEE sizes\n"); 316 unmap_sysmem(hdr); 317 return CMD_RET_FAILURE; 318 } 319 320 tee_info.tee_sec_mem_start = sec_mem_start; 321 tee_info.tee_sec_mem_size = size; 322 tee_info.tee_jump_addr = hdr->init_load_addr_lo; 323 tee_info.tee_cert_start = addr; 324 tee_info.tee_cert_size = tee_file_size; 325 tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr; 326 unmap_sysmem(hdr); 327 loadptr = map_sysmem(addr, tee_file_size); 328 329 debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start); 330 debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size); 331 debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr); 332 debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start); 333 debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size); 334 debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0); 335 debug("tee_file_size = %d\n", tee_file_size); 336 337 #if !defined(CONFIG_SYS_DCACHE_OFF) 338 flush_dcache_range( 339 rounddown((u32)loadptr, ARCH_DMA_MINALIGN), 340 roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN)); 341 342 flush_dcache_range((u32)&tee_info, (u32)&tee_info + 343 roundup(sizeof(tee_info), ARCH_DMA_MINALIGN)); 344 #endif 345 unmap_sysmem(loadptr); 346 347 ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info); 348 if (ret) { 349 printf("TEE_LOAD_MASTER Failed\n"); 350 return ret; 351 } 352 printf("TEE_LOAD_MASTER Done\n"); 353 354 #if defined(CONFIG_OMAP54XX) 355 if (!is_dra72x()) { 356 u32 *smc_cpu1_params; 357 /* Reuse the tee_info buffer for SMC params */ 358 smc_cpu1_params = (u32 *)&tee_info; 359 smc_cpu1_params[0] = 0; 360 #if !defined(CONFIG_SYS_DCACHE_OFF) 361 flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params + 362 roundup(sizeof(u32), ARCH_DMA_MINALIGN)); 363 #endif 364 ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0, 365 smc_cpu1_params); 366 if (ret) { 367 printf("TEE_LOAD_SLAVE Failed\n"); 368 return ret; 369 } 370 printf("TEE_LOAD_SLAVE Done\n"); 371 } 372 #endif 373 374 tee_loaded = 1; 375 376 return 0; 377 } 378