// SPDX-License-Identifier: GPL-2.0+ /* * * Common security related functions for OMAP devices * * (C) Copyright 2016-2017 * Texas Instruments, * * Daniel Allred * Andreas Dannenberg * Harinarayan Bhatta * Andrew F. Davis */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Index for signature verify ROM API */ #ifdef CONFIG_AM33XX #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000C) #else #define API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX (0x0000000E) #endif /* Index for signature PPA-based TI HAL APIs */ #define PPA_HAL_SERVICES_START_INDEX (0x200) #define PPA_SERV_HAL_TEE_LOAD_MASTER (PPA_HAL_SERVICES_START_INDEX + 23) #define PPA_SERV_HAL_TEE_LOAD_SLAVE (PPA_HAL_SERVICES_START_INDEX + 24) #define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25) #define PPA_SERV_HAL_SETUP_EMIF_FW_REGION (PPA_HAL_SERVICES_START_INDEX + 26) #define PPA_SERV_HAL_LOCK_EMIF_FW (PPA_HAL_SERVICES_START_INDEX + 27) /* Offset of header size if image is signed as ISW */ #define HEADER_SIZE_OFFSET (0x6D) int tee_loaded = 0; /* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */ struct ppa_tee_load_info { u32 tee_sec_mem_start; /* Physical start address reserved for TEE */ u32 tee_sec_mem_size; /* Size of the memory reserved for TEE */ u32 tee_cert_start; /* Address where signed TEE binary is loaded */ u32 tee_cert_size; /* Size of TEE certificate (signed binary) */ u32 tee_jump_addr; /* Address to jump to start TEE execution */ u32 tee_arg0; /* argument to TEE jump function, in r0 */ }; static uint32_t secure_rom_call_args[5] __aligned(ARCH_DMA_MINALIGN) __section(".data"); u32 secure_rom_call(u32 service, u32 proc_id, u32 flag, ...) { int i; u32 num_args; va_list ap; va_start(ap, flag); num_args = va_arg(ap, u32); if (num_args > 4) { va_end(ap); return 1; } /* Copy args to aligned args structure */ for (i = 0; i < num_args; i++) secure_rom_call_args[i + 1] = va_arg(ap, u32); secure_rom_call_args[0] = num_args; va_end(ap); /* if data cache is enabled, flush the aligned args structure */ flush_dcache_range( (unsigned int)&secure_rom_call_args[0], (unsigned int)&secure_rom_call_args[0] + roundup(sizeof(secure_rom_call_args), ARCH_DMA_MINALIGN)); return omap_smc_sec(service, proc_id, flag, secure_rom_call_args); } static u32 find_sig_start(char *image, size_t size) { char *image_end = image + size; char *sig_start_magic = "CERT_"; int magic_str_len = strlen(sig_start_magic); char *ch; while (--image_end > image) { if (*image_end == '_') { ch = image_end - magic_str_len + 1; if (!strncmp(ch, sig_start_magic, magic_str_len)) return (u32)ch; } } return 0; } int secure_boot_verify_image(void **image, size_t *size) { int result = 1; u32 cert_addr, sig_addr; size_t cert_size; /* Perform cache writeback on input buffer */ flush_dcache_range( rounddown((u32)*image, ARCH_DMA_MINALIGN), roundup((u32)*image + *size, ARCH_DMA_MINALIGN)); cert_addr = (uint32_t)*image; sig_addr = find_sig_start((char *)*image, *size); if (sig_addr == 0) { printf("No signature found in image!\n"); result = 1; goto auth_exit; } *size = sig_addr - cert_addr; /* Subtract out the signature size */ /* Subtract header if present */ if (strncmp((char *)sig_addr, "CERT_ISW_", 9) == 0) *size -= ((u32 *)*image)[HEADER_SIZE_OFFSET]; cert_size = *size; /* Check if image load address is 32-bit aligned */ if (!IS_ALIGNED(cert_addr, 4)) { printf("Image is not 4-byte aligned!\n"); result = 1; goto auth_exit; } /* Image size also should be multiple of 4 */ if (!IS_ALIGNED(cert_size, 4)) { printf("Image size is not 4-byte aligned!\n"); result = 1; goto auth_exit; } /* Call ROM HAL API to verify certificate signature */ debug("%s: load_addr = %x, size = %x, sig_addr = %x\n", __func__, cert_addr, cert_size, sig_addr); result = secure_rom_call( API_HAL_KM_VERIFYCERTIFICATESIGNATURE_INDEX, 0, 0, 4, cert_addr, cert_size, sig_addr, 0xFFFFFFFF); /* Perform cache writeback on output buffer */ flush_dcache_range( rounddown((u32)*image, ARCH_DMA_MINALIGN), roundup((u32)*image + *size, ARCH_DMA_MINALIGN)); auth_exit: if (result != 0) { printf("Authentication failed!\n"); printf("Return Value = %08X\n", result); hang(); } /* * Output notification of successful authentication to re-assure the * user that the secure code is being processed as expected. However * suppress any such log output in case of building for SPL and booting * via YMODEM. This is done to avoid disturbing the YMODEM serial * protocol transactions. */ if (!(IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) && spl_boot_device() == BOOT_DEVICE_UART)) printf("Authentication passed\n"); return result; } u32 get_sec_mem_start(void) { u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START; u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE; /* * Total reserved region is all contiguous with protected * region coming first, followed by the non-secure region. * If 0x0 start address is given, we simply put the reserved * region at the end of the external DRAM. */ if (sec_mem_start == 0) sec_mem_start = (CFG_SYS_SDRAM_BASE + ( #if defined(CONFIG_OMAP54XX) omap_sdram_size() #else get_ram_size((void *)CFG_SYS_SDRAM_BASE, CFG_MAX_RAM_BANK_SIZE) #endif - sec_mem_size)); return sec_mem_start; } int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr, uint32_t size, uint32_t access_perm, uint32_t initiator_perm) { int result = 1; /* * Call PPA HAL API to do any other general firewall * configuration for regions 1-6 of the EMIF firewall. */ debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__, region_num, start_addr, size); result = secure_rom_call( PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4, (start_addr & 0xFFFFFFF0) | (region_num & 0x0F), size, access_perm, initiator_perm); if (result != 0) { puts("Secure EMIF Firewall Setup failed!\n"); debug("Return Value = %x\n", result); } return result; } #if (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE < \ CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE) #error "TI Secure EMIF: Protected size cannot be larger than total size." #endif int secure_emif_reserve(void) { int result = 1; u32 sec_mem_start = get_sec_mem_start(); u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE; /* If there is no protected region, there is no reservation to make */ if (sec_prot_size == 0) return 0; /* * Call PPA HAL API to reserve a chunk of EMIF SDRAM * for secure world use. This region should be carved out * from use by any public code. EMIF firewall region 7 * will be used to protect this block of memory. */ result = secure_rom_call( PPA_SERV_HAL_SETUP_SEC_RESVD_REGION, 0, 0, 2, sec_mem_start, sec_prot_size); if (result != 0) { puts("SDRAM Firewall: Secure memory reservation failed!\n"); debug("Return Value = %x\n", result); } return result; } int secure_emif_firewall_lock(void) { int result = 1; /* * Call PPA HAL API to lock the EMIF firewall configurations. * After this API is called, none of the PPA HAL APIs for * configuring the EMIF firewalls will be usable again (that * is, calls to those APIs will return failure and have no * effect). */ result = secure_rom_call( PPA_SERV_HAL_LOCK_EMIF_FW, 0, 0, 0); if (result != 0) { puts("Secure EMIF Firewall Lock failed!\n"); debug("Return Value = %x\n", result); } return result; } static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN); int secure_tee_install(u32 addr) { struct optee_header *hdr; void *loadptr; u32 tee_file_size; u32 sec_mem_start = get_sec_mem_start(); const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE; u32 ret; /* If there is no protected region, there is no place to put the TEE */ if (size == 0) { printf("Error loading TEE, no protected memory region available\n"); return -ENOBUFS; } hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header)); /* 280 bytes = size of signature */ tee_file_size = hdr->init_size + hdr->paged_size + sizeof(struct optee_header) + 280; if ((hdr->magic != OPTEE_MAGIC) || (hdr->version != OPTEE_VERSION) || (tee_file_size > size)) { printf("Error in TEE header. Check firewall and TEE sizes\n"); unmap_sysmem(hdr); return CMD_RET_FAILURE; } tee_info.tee_sec_mem_start = sec_mem_start; tee_info.tee_sec_mem_size = size; tee_info.tee_jump_addr = hdr->init_load_addr_lo; tee_info.tee_cert_start = addr; tee_info.tee_cert_size = tee_file_size; tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr; unmap_sysmem(hdr); loadptr = map_sysmem(addr, tee_file_size); debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start); debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size); debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr); debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start); debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size); debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0); debug("tee_file_size = %d\n", tee_file_size); #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) flush_dcache_range( rounddown((u32)loadptr, ARCH_DMA_MINALIGN), roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN)); flush_dcache_range((u32)&tee_info, (u32)&tee_info + roundup(sizeof(tee_info), ARCH_DMA_MINALIGN)); #endif unmap_sysmem(loadptr); ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info); if (ret) { printf("TEE_LOAD_MASTER Failed\n"); return ret; } printf("TEE_LOAD_MASTER Done\n"); #if defined(CONFIG_OMAP54XX) if (!is_dra72x()) { u32 *smc_cpu1_params; /* Reuse the tee_info buffer for SMC params */ smc_cpu1_params = (u32 *)&tee_info; smc_cpu1_params[0] = 0; #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params + roundup(sizeof(u32), ARCH_DMA_MINALIGN)); #endif ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0, smc_cpu1_params); if (ret) { printf("TEE_LOAD_SLAVE Failed\n"); return ret; } printf("TEE_LOAD_SLAVE Done\n"); } #endif tee_loaded = 1; return 0; }