1 /* 2 * Copyright (c) 2018-2023, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <string.h> 9 #include <libfdt.h> 10 11 #if CRYPTO_SUPPORT 12 #include <mbedtls/version.h> 13 #endif /* CRYPTO_SUPPORT */ 14 15 #include <common/debug.h> 16 #include <common/desc_image_load.h> 17 #include <common/tbbr/tbbr_img_def.h> 18 #include <lib/fconf/fconf.h> 19 #include <lib/fconf/fconf_dyn_cfg_getter.h> 20 #include <lib/fconf/fconf_tbbr_getter.h> 21 22 #include <plat/arm/common/arm_dyn_cfg_helpers.h> 23 #include <plat/arm/common/plat_arm.h> 24 #include <platform_def.h> 25 26 #if CRYPTO_SUPPORT 27 28 static void *mbedtls_heap_addr; 29 static size_t mbedtls_heap_size; 30 31 /* 32 * This function is the implementation of the shared Mbed TLS heap between 33 * BL1 and BL2 for Arm platforms. The shared heap address is passed from BL1 34 * to BL2 with a pointer. This pointer resides inside the TB_FW_CONFIG file 35 * which is a DTB. 36 * 37 * This function is placed inside an #if directive for the below reasons: 38 * - To allocate space for the Mbed TLS heap --only if-- Trusted Board Boot 39 * is enabled. 40 * - This implementation requires the DTB to be present so that BL1 has a 41 * mechanism to pass the pointer to BL2. 42 */ 43 int arm_get_mbedtls_heap(void **heap_addr, size_t *heap_size) 44 { 45 assert(heap_addr != NULL); 46 assert(heap_size != NULL); 47 48 #if defined(IMAGE_BL1) || BL2_AT_EL3 || defined(IMAGE_BL31) 49 50 /* If in BL1 or BL2_AT_EL3 define a heap */ 51 static unsigned char heap[TF_MBEDTLS_HEAP_SIZE]; 52 53 *heap_addr = heap; 54 *heap_size = sizeof(heap); 55 mbedtls_heap_addr = heap; 56 mbedtls_heap_size = sizeof(heap); 57 58 #elif defined(IMAGE_BL2) 59 60 /* If in BL2, retrieve the already allocated heap's info from DTB */ 61 *heap_addr = FCONF_GET_PROPERTY(tbbr, dyn_config, mbedtls_heap_addr); 62 *heap_size = FCONF_GET_PROPERTY(tbbr, dyn_config, mbedtls_heap_size); 63 64 #endif 65 66 return 0; 67 } 68 69 /* 70 * Puts the shared Mbed TLS heap information to the DTB. 71 * Executed only from BL1. 72 */ 73 void arm_bl1_set_mbedtls_heap(void) 74 { 75 int err; 76 uintptr_t tb_fw_cfg_dtb; 77 const struct dyn_cfg_dtb_info_t *tb_fw_config_info; 78 79 /* 80 * If tb_fw_cfg_dtb==NULL then DTB is not present for the current 81 * platform. As such, we don't attempt to write to the DTB at all. 82 * 83 * If mbedtls_heap_addr==NULL, then it means we are using the default 84 * heap implementation. As such, BL2 will have its own heap for sure 85 * and hence there is no need to pass any information to the DTB. 86 * 87 * In the latter case, if we still wanted to write in the DTB the heap 88 * information, we would need to call plat_get_mbedtls_heap to retrieve 89 * the default heap's address and size. 90 */ 91 92 tb_fw_config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, TB_FW_CONFIG_ID); 93 assert(tb_fw_config_info != NULL); 94 95 tb_fw_cfg_dtb = tb_fw_config_info->config_addr; 96 97 if ((tb_fw_cfg_dtb != 0UL) && (mbedtls_heap_addr != NULL)) { 98 /* As libfdt uses void *, we can't avoid this cast */ 99 void *dtb = (void *)tb_fw_cfg_dtb; 100 101 err = arm_set_dtb_mbedtls_heap_info(dtb, 102 mbedtls_heap_addr, mbedtls_heap_size); 103 if (err < 0) { 104 ERROR("%swrite shared Mbed TLS heap information%s", 105 "BL1: unable to ", " to DTB\n"); 106 panic(); 107 } 108 #if !MEASURED_BOOT 109 /* 110 * Ensure that the info written to the DTB is visible to other 111 * images. It's critical because BL2 won't be able to proceed 112 * without the heap info. 113 * 114 * In MEASURED_BOOT case flushing is done in a function which 115 * is called after heap information is written in the DTB. 116 */ 117 flush_dcache_range(tb_fw_cfg_dtb, fdt_totalsize(dtb)); 118 #endif /* !MEASURED_BOOT */ 119 } 120 } 121 #endif /* CRYPTO_SUPPORT */ 122 123 /* 124 * BL2 utility function to initialize dynamic configuration specified by 125 * FW_CONFIG. Populate the bl_mem_params_node_t of other FW_CONFIGs if 126 * specified in FW_CONFIG. 127 */ 128 void arm_bl2_dyn_cfg_init(void) 129 { 130 unsigned int i; 131 bl_mem_params_node_t *cfg_mem_params = NULL; 132 uintptr_t image_base; 133 uint32_t image_size; 134 unsigned int error_config_id = MAX_IMAGE_IDS; 135 const unsigned int config_ids[] = { 136 HW_CONFIG_ID, 137 SOC_FW_CONFIG_ID, 138 NT_FW_CONFIG_ID, 139 TOS_FW_CONFIG_ID 140 }; 141 142 const struct dyn_cfg_dtb_info_t *dtb_info; 143 144 /* Iterate through all the fw config IDs */ 145 for (i = 0; i < ARRAY_SIZE(config_ids); i++) { 146 /* Get the config load address and size */ 147 cfg_mem_params = get_bl_mem_params_node(config_ids[i]); 148 if (cfg_mem_params == NULL) { 149 VERBOSE("%sconfig_id = %d in bl_mem_params_node\n", 150 "Couldn't find ", config_ids[i]); 151 continue; 152 } 153 154 dtb_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, config_ids[i]); 155 if (dtb_info == NULL) { 156 VERBOSE("%sconfig_id %d load info in FW_CONFIG\n", 157 "Couldn't find ", config_ids[i]); 158 continue; 159 } 160 161 image_base = dtb_info->config_addr; 162 image_size = dtb_info->config_max_size; 163 164 /* 165 * Do some runtime checks on the load addresses of soc_fw_config, 166 * tos_fw_config, nt_fw_config. This is not a comprehensive check 167 * of all invalid addresses but to prevent trivial porting errors. 168 */ 169 if (config_ids[i] != HW_CONFIG_ID) { 170 171 if (check_uptr_overflow(image_base, image_size)) { 172 VERBOSE("%s=%d as its %s is overflowing uptr\n", 173 "skip loading of firmware config", 174 config_ids[i], 175 "load-address"); 176 error_config_id = config_ids[i]; 177 continue; 178 } 179 #ifdef BL31_BASE 180 /* Ensure the configs don't overlap with BL31 */ 181 if ((image_base >= BL31_BASE) && 182 (image_base <= BL31_LIMIT)) { 183 VERBOSE("%s=%d as its %s is overlapping BL31\n", 184 "skip loading of firmware config", 185 config_ids[i], 186 "load-address"); 187 error_config_id = config_ids[i]; 188 continue; 189 } 190 #endif 191 /* Ensure the configs are loaded in a valid address */ 192 if (image_base < ARM_BL_RAM_BASE) { 193 VERBOSE("%s=%d as its %s is invalid\n", 194 "skip loading of firmware config", 195 config_ids[i], 196 "load-address"); 197 error_config_id = config_ids[i]; 198 continue; 199 } 200 #ifdef BL32_BASE 201 /* 202 * If BL32 is present, ensure that the configs don't 203 * overlap with it. 204 */ 205 if ((image_base >= BL32_BASE) && 206 (image_base <= BL32_LIMIT)) { 207 VERBOSE("%s=%d as its %s is overlapping BL32\n", 208 "skip loading of firmware config", 209 config_ids[i], 210 "load-address"); 211 error_config_id = config_ids[i]; 212 continue; 213 } 214 #endif 215 } 216 217 cfg_mem_params->image_info.image_base = image_base; 218 cfg_mem_params->image_info.image_max_size = (uint32_t)image_size; 219 220 /* 221 * Remove the IMAGE_ATTRIB_SKIP_LOADING attribute from 222 * HW_CONFIG or FW_CONFIG nodes 223 */ 224 cfg_mem_params->image_info.h.attr &= ~IMAGE_ATTRIB_SKIP_LOADING; 225 } 226 227 if (error_config_id != MAX_IMAGE_IDS) { 228 ERROR("Invalid config file %u\n", error_config_id); 229 panic(); 230 } 231 } 232