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