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

   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 to re-assure the
 172          * user that the secure code is being processed as expected. However
 173          * suppress any such log output in case of building for SPL and booting
 174          * via YMODEM. This is done to avoid disturbing the YMODEM serial
 175          * 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\n");
 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 }