Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 1 | /* |
Douglas Raillard | 308d359 | 2016-12-02 13:51:54 +0000 | [diff] [blame] | 2 | * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <assert.h> |
| 32 | #include <arch_helpers.h> |
| 33 | #include <auth_mod.h> |
| 34 | #include <bl1.h> |
| 35 | #include <bl_common.h> |
| 36 | #include <context.h> |
| 37 | #include <context_mgmt.h> |
| 38 | #include <debug.h> |
| 39 | #include <errno.h> |
| 40 | #include <platform.h> |
| 41 | #include <platform_def.h> |
| 42 | #include <smcc_helpers.h> |
| 43 | #include <string.h> |
Sandrine Bailleux | 949a52d | 2016-11-11 16:44:37 +0000 | [diff] [blame] | 44 | #include <utils.h> |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 45 | #include "bl1_private.h" |
| 46 | |
| 47 | /* |
| 48 | * Function declarations. |
| 49 | */ |
| 50 | static int bl1_fwu_image_copy(unsigned int image_id, |
| 51 | uintptr_t image_addr, |
| 52 | unsigned int block_size, |
| 53 | unsigned int image_size, |
| 54 | unsigned int flags); |
| 55 | static int bl1_fwu_image_auth(unsigned int image_id, |
| 56 | uintptr_t image_addr, |
| 57 | unsigned int image_size, |
| 58 | unsigned int flags); |
| 59 | static int bl1_fwu_image_execute(unsigned int image_id, |
| 60 | void **handle, |
| 61 | unsigned int flags); |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 62 | static register_t bl1_fwu_image_resume(register_t image_param, |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 63 | void **handle, |
| 64 | unsigned int flags); |
| 65 | static int bl1_fwu_sec_image_done(void **handle, |
| 66 | unsigned int flags); |
Dan Handley | 1f37b94 | 2015-12-15 14:28:24 +0000 | [diff] [blame] | 67 | __dead2 static void bl1_fwu_done(void *client_cookie, void *reserved); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * This keeps track of last executed secure image id. |
| 71 | */ |
| 72 | static unsigned int sec_exec_image_id = INVALID_IMAGE_ID; |
| 73 | |
| 74 | /******************************************************************************* |
| 75 | * Top level handler for servicing FWU SMCs. |
| 76 | ******************************************************************************/ |
| 77 | register_t bl1_fwu_smc_handler(unsigned int smc_fid, |
| 78 | register_t x1, |
| 79 | register_t x2, |
| 80 | register_t x3, |
| 81 | register_t x4, |
| 82 | void *cookie, |
| 83 | void *handle, |
| 84 | unsigned int flags) |
| 85 | { |
| 86 | |
| 87 | switch (smc_fid) { |
| 88 | case FWU_SMC_IMAGE_COPY: |
| 89 | SMC_RET1(handle, bl1_fwu_image_copy(x1, x2, x3, x4, flags)); |
| 90 | |
| 91 | case FWU_SMC_IMAGE_AUTH: |
| 92 | SMC_RET1(handle, bl1_fwu_image_auth(x1, x2, x3, flags)); |
| 93 | |
| 94 | case FWU_SMC_IMAGE_EXECUTE: |
| 95 | SMC_RET1(handle, bl1_fwu_image_execute(x1, &handle, flags)); |
| 96 | |
| 97 | case FWU_SMC_IMAGE_RESUME: |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 98 | SMC_RET1(handle, bl1_fwu_image_resume(x1, &handle, flags)); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 99 | |
| 100 | case FWU_SMC_SEC_IMAGE_DONE: |
| 101 | SMC_RET1(handle, bl1_fwu_sec_image_done(&handle, flags)); |
| 102 | |
| 103 | case FWU_SMC_UPDATE_DONE: |
Dan Handley | 1f37b94 | 2015-12-15 14:28:24 +0000 | [diff] [blame] | 104 | bl1_fwu_done((void *)x1, NULL); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 105 | /* We should never return from bl1_fwu_done() */ |
| 106 | |
| 107 | default: |
| 108 | assert(0); |
| 109 | break; |
| 110 | } |
| 111 | |
Antonio Nino Diaz | 7a317a7 | 2017-04-04 17:08:32 +0100 | [diff] [blame] | 112 | SMC_RET1(handle, SMC_UNK); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | /******************************************************************************* |
| 116 | * This function is responsible for copying secure images in AP Secure RAM. |
| 117 | ******************************************************************************/ |
| 118 | static int bl1_fwu_image_copy(unsigned int image_id, |
| 119 | uintptr_t image_src, |
| 120 | unsigned int block_size, |
| 121 | unsigned int image_size, |
| 122 | unsigned int flags) |
| 123 | { |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 124 | uintptr_t dest_addr; |
Sandrine Bailleux | b38a9e5 | 2016-11-14 14:56:51 +0000 | [diff] [blame] | 125 | unsigned int remaining; |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 126 | |
| 127 | /* Get the image descriptor. */ |
| 128 | image_desc_t *image_desc = bl1_plat_get_image_desc(image_id); |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 129 | if (!image_desc) { |
| 130 | WARN("BL1-FWU: Invalid image ID %u\n", image_id); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 131 | return -EPERM; |
| 132 | } |
| 133 | |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 134 | /* |
| 135 | * The request must originate from a non-secure caller and target a |
| 136 | * secure image. Any other scenario is invalid. |
| 137 | */ |
| 138 | if (GET_SECURITY_STATE(flags) == SECURE) { |
| 139 | WARN("BL1-FWU: Copy not allowed from secure world.\n"); |
| 140 | return -EPERM; |
| 141 | } |
| 142 | if (GET_SECURITY_STATE(image_desc->ep_info.h.attr) == NON_SECURE) { |
| 143 | WARN("BL1-FWU: Copy not allowed for non-secure images.\n"); |
| 144 | return -EPERM; |
| 145 | } |
| 146 | |
| 147 | /* Check whether the FWU state machine is in the correct state. */ |
| 148 | if ((image_desc->state != IMAGE_STATE_RESET) && |
| 149 | (image_desc->state != IMAGE_STATE_COPYING)) { |
| 150 | WARN("BL1-FWU: Copy not allowed at this point of the FWU" |
| 151 | " process.\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 152 | return -EPERM; |
| 153 | } |
| 154 | |
Sandrine Bailleux | 949a52d | 2016-11-11 16:44:37 +0000 | [diff] [blame] | 155 | if ((!image_src) || (!block_size) || |
| 156 | check_uptr_overflow(image_src, block_size - 1)) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 157 | WARN("BL1-FWU: Copy not allowed due to invalid image source" |
| 158 | " or block size\n"); |
| 159 | return -ENOMEM; |
| 160 | } |
| 161 | |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 162 | if (image_desc->state == IMAGE_STATE_COPYING) { |
Sandrine Bailleux | 1bfb706 | 2016-11-14 14:58:05 +0000 | [diff] [blame] | 163 | /* |
| 164 | * There must have been at least 1 copy operation for this image |
| 165 | * previously. |
| 166 | */ |
| 167 | assert(image_desc->copied_size != 0); |
| 168 | /* |
| 169 | * The image size must have been recorded in the 1st copy |
| 170 | * operation. |
| 171 | */ |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 172 | image_size = image_desc->image_info.image_size; |
Sandrine Bailleux | 1bfb706 | 2016-11-14 14:58:05 +0000 | [diff] [blame] | 173 | assert(image_size != 0); |
| 174 | assert(image_desc->copied_size < image_size); |
| 175 | |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 176 | INFO("BL1-FWU: Continuing image copy in blocks\n"); |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 177 | } else { /* image_desc->state == IMAGE_STATE_RESET */ |
| 178 | INFO("BL1-FWU: Initial call to copy an image\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 179 | |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 180 | /* |
| 181 | * image_size is relevant only for the 1st copy request, it is |
| 182 | * then ignored for subsequent calls for this image. |
| 183 | */ |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 184 | if (!image_size) { |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 185 | WARN("BL1-FWU: Copy not allowed due to invalid image" |
| 186 | " size\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 187 | return -ENOMEM; |
| 188 | } |
| 189 | |
Yatharth Kochar | 53d703a | 2016-11-11 13:57:50 +0000 | [diff] [blame] | 190 | #if LOAD_IMAGE_V2 |
| 191 | /* Check that the image size to load is within limit */ |
| 192 | if (image_size > image_desc->image_info.image_max_size) { |
| 193 | WARN("BL1-FWU: Image size out of bounds\n"); |
| 194 | return -ENOMEM; |
| 195 | } |
| 196 | #else |
Sandrine Bailleux | 949a52d | 2016-11-11 16:44:37 +0000 | [diff] [blame] | 197 | /* |
| 198 | * Check the image will fit into the free trusted RAM after BL1 |
| 199 | * load. |
| 200 | */ |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 201 | const meminfo_t *mem_layout = bl1_plat_sec_mem_layout(); |
Sandrine Bailleux | 949a52d | 2016-11-11 16:44:37 +0000 | [diff] [blame] | 202 | if (!is_mem_free(mem_layout->free_base, mem_layout->free_size, |
| 203 | image_desc->image_info.image_base, |
| 204 | image_size)) { |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 205 | WARN("BL1-FWU: Copy not allowed due to insufficient" |
| 206 | " resources.\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 207 | return -ENOMEM; |
| 208 | } |
Yatharth Kochar | 53d703a | 2016-11-11 13:57:50 +0000 | [diff] [blame] | 209 | #endif |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 210 | |
Sandrine Bailleux | 9f1489e | 2016-11-11 15:56:20 +0000 | [diff] [blame] | 211 | /* Save the given image size. */ |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 212 | image_desc->image_info.image_size = image_size; |
| 213 | |
Sandrine Bailleux | b38a9e5 | 2016-11-14 14:56:51 +0000 | [diff] [blame] | 214 | /* |
| 215 | * copied_size must be explicitly initialized here because the |
| 216 | * FWU code doesn't necessarily do it when it resets the state |
| 217 | * machine. |
| 218 | */ |
| 219 | image_desc->copied_size = 0; |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 220 | } |
| 221 | |
Sandrine Bailleux | b38a9e5 | 2016-11-14 14:56:51 +0000 | [diff] [blame] | 222 | /* |
| 223 | * If the given block size is more than the total image size |
| 224 | * then clip the former to the latter. |
| 225 | */ |
| 226 | remaining = image_size - image_desc->copied_size; |
| 227 | if (block_size > remaining) { |
| 228 | WARN("BL1-FWU: Block size is too big, clipping it.\n"); |
| 229 | block_size = remaining; |
| 230 | } |
| 231 | |
| 232 | /* Make sure the source image is mapped in memory. */ |
| 233 | if (bl1_plat_mem_check(image_src, block_size, flags)) { |
| 234 | WARN("BL1-FWU: Source image is not mapped.\n"); |
| 235 | return -ENOMEM; |
| 236 | } |
| 237 | |
| 238 | /* Everything looks sane. Go ahead and copy the block of data. */ |
| 239 | dest_addr = image_desc->image_info.image_base + image_desc->copied_size; |
| 240 | memcpy((void *) dest_addr, (const void *) image_src, block_size); |
| 241 | flush_dcache_range(dest_addr, block_size); |
| 242 | |
| 243 | image_desc->copied_size += block_size; |
| 244 | image_desc->state = (block_size == remaining) ? |
| 245 | IMAGE_STATE_COPIED : IMAGE_STATE_COPYING; |
| 246 | |
| 247 | INFO("BL1-FWU: Copy operation successful.\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | /******************************************************************************* |
| 252 | * This function is responsible for authenticating Normal/Secure images. |
| 253 | ******************************************************************************/ |
| 254 | static int bl1_fwu_image_auth(unsigned int image_id, |
| 255 | uintptr_t image_src, |
| 256 | unsigned int image_size, |
| 257 | unsigned int flags) |
| 258 | { |
| 259 | int result; |
| 260 | uintptr_t base_addr; |
| 261 | unsigned int total_size; |
| 262 | |
| 263 | /* Get the image descriptor. */ |
| 264 | image_desc_t *image_desc = bl1_plat_get_image_desc(image_id); |
| 265 | if (!image_desc) |
| 266 | return -EPERM; |
| 267 | |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 268 | if (GET_SECURITY_STATE(flags) == SECURE) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 269 | if (image_desc->state != IMAGE_STATE_RESET) { |
| 270 | WARN("BL1-FWU: Authentication from secure world " |
| 271 | "while in invalid state\n"); |
| 272 | return -EPERM; |
| 273 | } |
| 274 | } else { |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 275 | if (GET_SECURITY_STATE(image_desc->ep_info.h.attr) == SECURE) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 276 | if (image_desc->state != IMAGE_STATE_COPIED) { |
| 277 | WARN("BL1-FWU: Authentication of secure image " |
| 278 | "from non-secure world while not in copied state\n"); |
| 279 | return -EPERM; |
| 280 | } |
| 281 | } else { |
| 282 | if (image_desc->state != IMAGE_STATE_RESET) { |
| 283 | WARN("BL1-FWU: Authentication of non-secure image " |
| 284 | "from non-secure world while in invalid state\n"); |
| 285 | return -EPERM; |
| 286 | } |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | if (image_desc->state == IMAGE_STATE_COPIED) { |
| 291 | /* |
| 292 | * Image is in COPIED state. |
| 293 | * Use the stored address and size. |
| 294 | */ |
| 295 | base_addr = image_desc->image_info.image_base; |
| 296 | total_size = image_desc->image_info.image_size; |
| 297 | } else { |
Sandrine Bailleux | 949a52d | 2016-11-11 16:44:37 +0000 | [diff] [blame] | 298 | if ((!image_src) || (!image_size) || |
| 299 | check_uptr_overflow(image_src, image_size - 1)) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 300 | WARN("BL1-FWU: Auth not allowed due to invalid" |
| 301 | " image source/size\n"); |
| 302 | return -ENOMEM; |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * Image is in RESET state. |
| 307 | * Check the parameters and authenticate the source image in place. |
| 308 | */ |
Dan Handley | 03131c8 | 2015-12-14 16:26:43 +0000 | [diff] [blame] | 309 | if (bl1_plat_mem_check(image_src, image_size, \ |
| 310 | image_desc->ep_info.h.attr)) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 311 | WARN("BL1-FWU: Authentication arguments source/size not mapped\n"); |
| 312 | return -ENOMEM; |
| 313 | } |
| 314 | |
| 315 | base_addr = image_src; |
| 316 | total_size = image_size; |
| 317 | |
| 318 | /* Update the image size in the descriptor. */ |
| 319 | image_desc->image_info.image_size = total_size; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Authenticate the image. |
| 324 | */ |
| 325 | INFO("BL1-FWU: Authenticating image_id:%d\n", image_id); |
| 326 | result = auth_mod_verify_img(image_id, (void *)base_addr, total_size); |
| 327 | if (result != 0) { |
| 328 | WARN("BL1-FWU: Authentication Failed err=%d\n", result); |
| 329 | |
| 330 | /* |
| 331 | * Authentication has failed. |
| 332 | * Clear the memory if the image was copied. |
| 333 | * This is to prevent an attack where this contains |
| 334 | * some malicious code that can somehow be executed later. |
| 335 | */ |
| 336 | if (image_desc->state == IMAGE_STATE_COPIED) { |
| 337 | /* Clear the memory.*/ |
Douglas Raillard | 308d359 | 2016-12-02 13:51:54 +0000 | [diff] [blame] | 338 | zero_normalmem((void *)base_addr, total_size); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 339 | flush_dcache_range(base_addr, total_size); |
| 340 | |
| 341 | /* Indicate that image can be copied again*/ |
| 342 | image_desc->state = IMAGE_STATE_RESET; |
| 343 | } |
| 344 | return -EAUTH; |
| 345 | } |
| 346 | |
| 347 | /* Indicate that image is in authenticated state. */ |
| 348 | image_desc->state = IMAGE_STATE_AUTHENTICATED; |
| 349 | |
| 350 | /* |
| 351 | * Flush image_info to memory so that other |
| 352 | * secure world images can see changes. |
| 353 | */ |
| 354 | flush_dcache_range((unsigned long)&image_desc->image_info, |
| 355 | sizeof(image_info_t)); |
| 356 | |
| 357 | INFO("BL1-FWU: Authentication was successful\n"); |
| 358 | |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | /******************************************************************************* |
| 363 | * This function is responsible for executing Secure images. |
| 364 | ******************************************************************************/ |
| 365 | static int bl1_fwu_image_execute(unsigned int image_id, |
| 366 | void **handle, |
| 367 | unsigned int flags) |
| 368 | { |
| 369 | /* Get the image descriptor. */ |
| 370 | image_desc_t *image_desc = bl1_plat_get_image_desc(image_id); |
| 371 | |
| 372 | /* |
| 373 | * Execution is NOT allowed if: |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 374 | * image_id is invalid OR |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 375 | * Caller is from Secure world OR |
| 376 | * Image is Non-Secure OR |
| 377 | * Image is Non-Executable OR |
| 378 | * Image is NOT in AUTHENTICATED state. |
| 379 | */ |
| 380 | if ((!image_desc) || |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 381 | (GET_SECURITY_STATE(flags) == SECURE) || |
| 382 | (GET_SECURITY_STATE(image_desc->ep_info.h.attr) == NON_SECURE) || |
| 383 | (EP_GET_EXE(image_desc->ep_info.h.attr) == NON_EXECUTABLE) || |
| 384 | (image_desc->state != IMAGE_STATE_AUTHENTICATED)) { |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 385 | WARN("BL1-FWU: Execution not allowed due to invalid state/args\n"); |
| 386 | return -EPERM; |
| 387 | } |
| 388 | |
| 389 | INFO("BL1-FWU: Executing Secure image\n"); |
| 390 | |
| 391 | /* Save NS-EL1 system registers. */ |
| 392 | cm_el1_sysregs_context_save(NON_SECURE); |
| 393 | |
| 394 | /* Prepare the image for execution. */ |
| 395 | bl1_prepare_next_image(image_id); |
| 396 | |
| 397 | /* Update the secure image id. */ |
| 398 | sec_exec_image_id = image_id; |
| 399 | |
| 400 | *handle = cm_get_context(SECURE); |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | /******************************************************************************* |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 405 | * This function is responsible for resuming execution in the other security |
| 406 | * world |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 407 | ******************************************************************************/ |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 408 | static register_t bl1_fwu_image_resume(register_t image_param, |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 409 | void **handle, |
| 410 | unsigned int flags) |
| 411 | { |
| 412 | image_desc_t *image_desc; |
| 413 | unsigned int resume_sec_state; |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 414 | unsigned int caller_sec_state = GET_SECURITY_STATE(flags); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 415 | |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 416 | /* Get the image descriptor for last executed secure image id. */ |
| 417 | image_desc = bl1_plat_get_image_desc(sec_exec_image_id); |
| 418 | if (caller_sec_state == NON_SECURE) { |
| 419 | if (!image_desc) { |
| 420 | WARN("BL1-FWU: Resume not allowed due to no available" |
| 421 | "secure image\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 422 | return -EPERM; |
| 423 | } |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 424 | } else { |
| 425 | /* image_desc must be valid for secure world callers */ |
| 426 | assert(image_desc); |
| 427 | } |
| 428 | |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 429 | assert(GET_SECURITY_STATE(image_desc->ep_info.h.attr) == SECURE); |
| 430 | assert(EP_GET_EXE(image_desc->ep_info.h.attr) == EXECUTABLE); |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 431 | |
| 432 | if (caller_sec_state == SECURE) { |
| 433 | assert(image_desc->state == IMAGE_STATE_EXECUTED); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 434 | |
| 435 | /* Update the flags. */ |
| 436 | image_desc->state = IMAGE_STATE_INTERRUPTED; |
| 437 | resume_sec_state = NON_SECURE; |
| 438 | } else { |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 439 | assert(image_desc->state == IMAGE_STATE_INTERRUPTED); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 440 | |
| 441 | /* Update the flags. */ |
| 442 | image_desc->state = IMAGE_STATE_EXECUTED; |
| 443 | resume_sec_state = SECURE; |
| 444 | } |
| 445 | |
| 446 | /* Save the EL1 system registers of calling world. */ |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 447 | cm_el1_sysregs_context_save(caller_sec_state); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 448 | |
| 449 | /* Restore the EL1 system registers of resuming world. */ |
| 450 | cm_el1_sysregs_context_restore(resume_sec_state); |
| 451 | |
| 452 | /* Update the next context. */ |
| 453 | cm_set_next_eret_context(resume_sec_state); |
| 454 | |
| 455 | INFO("BL1-FWU: Resuming %s world context\n", |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 456 | (resume_sec_state == SECURE) ? "secure" : "normal"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 457 | |
| 458 | *handle = cm_get_context(resume_sec_state); |
| 459 | return image_param; |
| 460 | } |
| 461 | |
| 462 | /******************************************************************************* |
| 463 | * This function is responsible for resuming normal world context. |
| 464 | ******************************************************************************/ |
| 465 | static int bl1_fwu_sec_image_done(void **handle, unsigned int flags) |
| 466 | { |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 467 | image_desc_t *image_desc; |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 468 | |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 469 | /* Make sure caller is from the secure world */ |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 470 | if (GET_SECURITY_STATE(flags) == NON_SECURE) { |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 471 | WARN("BL1-FWU: Image done not allowed from normal world\n"); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 472 | return -EPERM; |
| 473 | } |
| 474 | |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 475 | /* Get the image descriptor for last executed secure image id */ |
| 476 | image_desc = bl1_plat_get_image_desc(sec_exec_image_id); |
| 477 | |
| 478 | /* image_desc must correspond to a valid secure executing image */ |
| 479 | assert(image_desc); |
Yatharth Kochar | 843ddee | 2016-02-01 11:04:46 +0000 | [diff] [blame] | 480 | assert(GET_SECURITY_STATE(image_desc->ep_info.h.attr) == SECURE); |
| 481 | assert(EP_GET_EXE(image_desc->ep_info.h.attr) == EXECUTABLE); |
Dan Handley | 28955d5 | 2015-12-15 10:52:33 +0000 | [diff] [blame] | 482 | assert(image_desc->state == IMAGE_STATE_EXECUTED); |
| 483 | |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 484 | /* Update the flags. */ |
| 485 | image_desc->state = IMAGE_STATE_RESET; |
| 486 | sec_exec_image_id = INVALID_IMAGE_ID; |
| 487 | |
| 488 | /* |
| 489 | * Secure world is done so no need to save the context. |
| 490 | * Just restore the Non-Secure context. |
| 491 | */ |
| 492 | cm_el1_sysregs_context_restore(NON_SECURE); |
| 493 | |
| 494 | /* Update the next context. */ |
| 495 | cm_set_next_eret_context(NON_SECURE); |
| 496 | |
| 497 | INFO("BL1-FWU: Resuming Normal world context\n"); |
| 498 | |
| 499 | *handle = cm_get_context(NON_SECURE); |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | /******************************************************************************* |
| 504 | * This function provides the opportunity for users to perform any |
| 505 | * platform specific handling after the Firmware update is done. |
| 506 | ******************************************************************************/ |
Dan Handley | 1f37b94 | 2015-12-15 14:28:24 +0000 | [diff] [blame] | 507 | __dead2 static void bl1_fwu_done(void *client_cookie, void *reserved) |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 508 | { |
| 509 | NOTICE("BL1-FWU: *******FWU Process Completed*******\n"); |
| 510 | |
| 511 | /* |
| 512 | * Call platform done function. |
| 513 | */ |
Dan Handley | 1f37b94 | 2015-12-15 14:28:24 +0000 | [diff] [blame] | 514 | bl1_plat_fwu_done(client_cookie, reserved); |
Yatharth Kochar | 48bfb88 | 2015-10-10 19:06:53 +0100 | [diff] [blame] | 515 | assert(0); |
| 516 | } |