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