arch/arm/mach-omap2/sec-common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *
   4  * Common security related functions for OMAP devices
   5  *
   6  * (C) Copyright 2016-2017
   7  * Texas Instruments, <www.ti.com>
   8  *
   9  * Daniel Allred <d-allred@ti.com>
  10  * Andreas Dannenberg <dannenberg@ti.com>
  11  * Harinarayan Bhatta <harinarayan@ti.com>
  12  * Andrew F. Davis <afd@ti.com>
  13  */
  14
  15 #include <common.h>
  16 #include <command.h>
  17 #include <cpu_func.h>
  18 #include <hang.h>
  19 #include <init.h>
  20 #include <stdarg.h>
  21
  22 #include <asm/arch/sys_proto.h>
  23 #include <asm/cache.h>
  24 #include <asm/omap_common.h>
  25 #include <asm/omap_sec_common.h>
  26 #include <asm/spl.h>
  27 #include <asm/ti-common/sys_proto.h>
  28 #include <mapmem.h>
  29 #include <spl.h>
  30 #include <tee/optee.h>
  31
  32 /* Index for signature verify ROM API */
  33 #ifdef CONFIG_AM33XX
  34 #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX     (0x0000000C)
  35 #else
  36 #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX     (0x0000000E)
  37 #endif
  38
  39 /* Index for signature PPA-based TI HAL APIs */
  40 #define PPA_HAL_SERVICES_START_INDEX        (0x200)
  41 #define PPA_SERV_HAL_TEE_LOAD_MASTER        (PPA_HAL_SERVICES_START_INDEX + 23)
  42 #define PPA_SERV_HAL_TEE_LOAD_SLAVE         (PPA_HAL_SERVICES_START_INDEX + 24)
  43 #define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25)
  44 #define PPA_SERV_HAL_SETUP_EMIF_FW_REGION   (PPA_HAL_SERVICES_START_INDEX + 26)
  45 #define PPA_SERV_HAL_LOCK_EMIF_FW           (PPA_HAL_SERVICES_START_INDEX + 27)
  46
  47 /* Offset of header size if image is signed as ISW */
  48 #define HEADER_SIZE_OFFSET      (0x6D)
  49
  50 int tee_loaded = 0;
  51
  52 /* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */
  53 struct ppa_tee_load_info {
  54         u32 tee_sec_mem_start; /* Physical start address reserved for TEE */
  55         u32 tee_sec_mem_size;  /* Size of the memory reserved for TEE */
  56         u32 tee_cert_start;    /* Address where signed TEE binary is loaded */
  57         u32 tee_cert_size;     /* Size of TEE certificate (signed binary) */
  58         u32 tee_jump_addr;     /* Address to jump to start TEE execution */
  59         u32 tee_arg0;          /* argument to TEE jump function, in r0 */
  60 };
  61
  62 static uint32_t secure_rom_call_args[5] __aligned(ARCH_DMA_MINALIGN) __section(".data");
  63
  64 u32 secure_rom_call(u32 service, u32 proc_id, u32 flag, ...)
  65 {
  66         int i;
  67         u32 num_args;
  68         va_list ap;
  69
  70         va_start(ap, flag);
  71
  72         num_args = va_arg(ap, u32);
  73
  74         if (num_args > 4) {
  75                 va_end(ap);
  76                 return 1;
  77         }
  78
  79         /* Copy args to aligned args structure */
  80         for (i = 0; i < num_args; i++)
  81                 secure_rom_call_args[i + 1] = va_arg(ap, u32);
  82
  83         secure_rom_call_args[0] = num_args;
  84
  85         va_end(ap);
  86
  87         /* if data cache is enabled, flush the aligned args structure */
  88         flush_dcache_range(
  89                 (unsigned int)&secure_rom_call_args[0],
  90                 (unsigned int)&secure_rom_call_args[0] +
  91                 roundup(sizeof(secure_rom_call_args), ARCH_DMA_MINALIGN));
  92
  93         return omap_smc_sec(service, proc_id, flag, secure_rom_call_args);
  94 }
  95
  96 static u32 find_sig_start(char *image, size_t size)
  97 {
  98         char *image_end = image + size;
  99         char *sig_start_magic = "CERT_";
 100         int magic_str_len = strlen(sig_start_magic);
 101         char *ch;
 102
 103         while (--image_end > image) {
 104                 if (*image_end == '_') {
 105                         ch = image_end - magic_str_len + 1;
 106                         if (!strncmp(ch, sig_start_magic, magic_str_len))
 107                                 return (u32)ch;
 108                 }
 109         }
 110         return 0;
 111 }
 112
 113 int secure_boot_verify_image(void **image, size_t *size)
 114 {
 115         int result = 1;
 116         u32 cert_addr, sig_addr;
 117         size_t cert_size;
 118
 119         /* Perform cache writeback on input buffer */
 120         flush_dcache_range(
 121                 rounddown((u32)*image, ARCH_DMA_MINALIGN),
 122                 roundup((u32)*image + *size, ARCH_DMA_MINALIGN));
 123
 124         cert_addr = (uint32_t)*image;
 125         sig_addr = find_sig_start((char *)*image, *size);
 126
 127         if (sig_addr == 0) {
 128                 printf("No signature found in image!\n");
 129                 result = 1;
 130                 goto auth_exit;
 131         }
 132
 133         *size = sig_addr - cert_addr;   /* Subtract out the signature size */
 134         /* Subtract header if present */
 135         if (strncmp((char *)sig_addr, "CERT_ISW_", 9) == 0)
 136                 *size -= ((u32 *)*image)[HEADER_SIZE_OFFSET];
 137         cert_size = *size;
 138
 139         /* Check if image load address is 32-bit aligned */
 140         if (!IS_ALIGNED(cert_addr, 4)) {
 141                 printf("Image is not 4-byte aligned!\n");
 142                 result = 1;
 143                 goto auth_exit;
 144         }
 145
 146         /* Image size also should be multiple of 4 */
 147         if (!IS_ALIGNED(cert_size, 4)) {
 148                 printf("Image size is not 4-byte aligned!\n");
 149                 result = 1;
 150                 goto auth_exit;
 151         }
 152
 153         /* Call ROM HAL API to verify certificate signature */
 154         debug("%s: load_addr = %x, size = %x, sig_addr = %x\n", __func__,
 155               cert_addr, cert_size, sig_addr);
 156
 157         result = secure_rom_call(
 158                 API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX, 0, 0,
 159                 4, cert_addr, cert_size, sig_addr, 0xFFFFFFFF);
 160
 161         /* Perform cache writeback on output buffer */
 162         flush_dcache_range(
 163                 rounddown((u32)*image, ARCH_DMA_MINALIGN),
 164                 roundup((u32)*image + *size, ARCH_DMA_MINALIGN));
 165
 166 auth_exit:
 167         if (result != 0) {
 168                 printf("Authentication failed!\n");
 169                 printf("Return Value = %08X\n", result);
 170                 hang();
 171         }
 172
 173         /*
 174          * Output notification of successful authentication to re-assure the
 175          * user that the secure code is being processed as expected. However
 176          * suppress any such log output in case of building for SPL and booting
 177          * via YMODEM. This is done to avoid disturbing the YMODEM serial
 178          * protocol transactions.
 179          */
 180         if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
 181               IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
 182               spl_boot_device() == BOOT_DEVICE_UART))
 183                 printf("Authentication passed\n");
 184
 185         return result;
 186 }
 187
 188 u32 get_sec_mem_start(void)
 189 {
 190         u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
 191         u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;
 192         /*
 193          * Total reserved region is all contiguous with protected
 194          * region coming first, followed by the non-secure region.
 195          * If 0x0 start address is given, we simply put the reserved
 196          * region at the end of the external DRAM.
 197          */
 198         if (sec_mem_start == 0)
 199                 sec_mem_start =
 200                         (CONFIG_SYS_SDRAM_BASE + (
 201 #if defined(CONFIG_OMAP54XX)
 202                         omap_sdram_size()
 203 #else
 204                         get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
 205                                      CONFIG_MAX_RAM_BANK_SIZE)
 206 #endif
 207                         - sec_mem_size));
 208         return sec_mem_start;
 209 }
 210
 211 int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr,
 212                                uint32_t size, uint32_t access_perm,
 213                                uint32_t initiator_perm)
 214 {
 215         int result = 1;
 216
 217         /*
 218          * Call PPA HAL API to do any other general firewall
 219          * configuration for regions 1-6 of the EMIF firewall.
 220          */
 221         debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__,
 222               region_num, start_addr, size);
 223
 224         result = secure_rom_call(
 225                         PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4,
 226                         (start_addr & 0xFFFFFFF0) | (region_num & 0x0F),
 227                         size, access_perm, initiator_perm);
 228
 229         if (result != 0) {
 230                 puts("Secure EMIF Firewall Setup failed!\n");
 231                 debug("Return Value = %x\n", result);
 232         }
 233
 234         return result;
 235 }
 236
 237 #if     (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE <  \
 238         CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE)
 239 #error  "TI Secure EMIF: Protected size cannot be larger than total size."
 240 #endif
 241 int secure_emif_reserve(void)
 242 {
 243         int result = 1;
 244         u32 sec_mem_start = get_sec_mem_start();
 245         u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
 246
 247         /* If there is no protected region, there is no reservation to make */
 248         if (sec_prot_size == 0)
 249                 return 0;
 250
 251         /*
 252          * Call PPA HAL API to reserve a chunk of EMIF SDRAM
 253          * for secure world use. This region should be carved out
 254          * from use by any public code. EMIF firewall region 7
 255          * will be used to protect this block of memory.
 256          */
 257         result = secure_rom_call(
 258                         PPA_SERV_HAL_SETUP_SEC_RESVD_REGION,
 259                         0, 0, 2, sec_mem_start, sec_prot_size);
 260
 261         if (result != 0) {
 262                 puts("SDRAM Firewall: Secure memory reservation failed!\n");
 263                 debug("Return Value = %x\n", result);
 264         }
 265
 266         return result;
 267 }
 268
 269 int secure_emif_firewall_lock(void)
 270 {
 271         int result = 1;
 272
 273         /*
 274          * Call PPA HAL API to lock the EMIF firewall configurations.
 275          * After this API is called, none of the PPA HAL APIs for
 276          * configuring the EMIF firewalls will be usable again (that
 277          * is, calls to those APIs will return failure and have no
 278          * effect).
 279          */
 280
 281         result = secure_rom_call(
 282                         PPA_SERV_HAL_LOCK_EMIF_FW,
 283                         0, 0, 0);
 284
 285         if (result != 0) {
 286                 puts("Secure EMIF Firewall Lock failed!\n");
 287                 debug("Return Value = %x\n", result);
 288         }
 289
 290         return result;
 291 }
 292
 293 static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN);
 294
 295 int secure_tee_install(u32 addr)
 296 {
 297         struct optee_header *hdr;
 298         void *loadptr;
 299         u32 tee_file_size;
 300         u32 sec_mem_start = get_sec_mem_start();
 301         const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
 302         u32 ret;
 303
 304         /* If there is no protected region, there is no place to put the TEE */
 305         if (size == 0) {
 306                 printf("Error loading TEE, no protected memory region available\n");
 307                 return -ENOBUFS;
 308         }
 309
 310         hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header));
 311         /* 280 bytes = size of signature */
 312         tee_file_size = hdr->init_size + hdr->paged_size +
 313                         sizeof(struct optee_header) + 280;
 314
 315         if ((hdr->magic != OPTEE_MAGIC) ||
 316             (hdr->version != OPTEE_VERSION) ||
 317             (tee_file_size > size)) {
 318                 printf("Error in TEE header. Check firewall and TEE sizes\n");
 319                 unmap_sysmem(hdr);
 320                 return CMD_RET_FAILURE;
 321         }
 322
 323         tee_info.tee_sec_mem_start = sec_mem_start;
 324         tee_info.tee_sec_mem_size = size;
 325         tee_info.tee_jump_addr = hdr->init_load_addr_lo;
 326         tee_info.tee_cert_start = addr;
 327         tee_info.tee_cert_size = tee_file_size;
 328         tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr;
 329         unmap_sysmem(hdr);
 330         loadptr = map_sysmem(addr, tee_file_size);
 331
 332         debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start);
 333         debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size);
 334         debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr);
 335         debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start);
 336         debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size);
 337         debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0);
 338         debug("tee_file_size = %d\n", tee_file_size);
 339
 340 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 341         flush_dcache_range(
 342                 rounddown((u32)loadptr, ARCH_DMA_MINALIGN),
 343                 roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN));
 344
 345         flush_dcache_range((u32)&tee_info, (u32)&tee_info +
 346                         roundup(sizeof(tee_info), ARCH_DMA_MINALIGN));
 347 #endif
 348         unmap_sysmem(loadptr);
 349
 350         ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info);
 351         if (ret) {
 352                 printf("TEE_LOAD_MASTER Failed\n");
 353                 return ret;
 354         }
 355         printf("TEE_LOAD_MASTER Done\n");
 356
 357 #if defined(CONFIG_OMAP54XX)
 358         if (!is_dra72x()) {
 359                 u32 *smc_cpu1_params;
 360                 /* Reuse the tee_info buffer for SMC params */
 361                 smc_cpu1_params = (u32 *)&tee_info;
 362                 smc_cpu1_params[0] = 0;
 363 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 364                 flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params +
 365                                 roundup(sizeof(u32), ARCH_DMA_MINALIGN));
 366 #endif
 367                 ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0,
 368                                 smc_cpu1_params);
 369                 if (ret) {
 370                         printf("TEE_LOAD_SLAVE Failed\n");
 371                         return ret;
 372                 }
 373                 printf("TEE_LOAD_SLAVE Done\n");
 374         }
 375 #endif
 376
 377         tee_loaded = 1;
 378
 379         return 0;
 380 }