1 /* 2 * Copyright 2016 NXP Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <errno.h> 9 #include <linux/kernel.h> 10 #include <asm/io.h> 11 #include <asm/system.h> 12 #include <asm/types.h> 13 #include <asm/macro.h> 14 #include <asm/armv8/sec_firmware.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 extern void c_runtime_cpu_setup(void); 18 19 #define SEC_FIRMWARE_LOADED 0x1 20 #define SEC_FIRMWARE_RUNNING 0x2 21 #define SEC_FIRMWARE_ADDR_MASK (~0x3) 22 /* 23 * Secure firmware load addr 24 * Flags used: 0x1 secure firmware has been loaded to secure memory 25 * 0x2 secure firmware is running 26 */ 27 phys_addr_t sec_firmware_addr; 28 29 #ifndef SEC_FIRMWARE_FIT_IMAGE 30 #define SEC_FIRMWARE_FIT_IMAGE "firmware" 31 #endif 32 #ifndef SEC_FIRMEWARE_FIT_CNF_NAME 33 #define SEC_FIRMEWARE_FIT_CNF_NAME "config@1" 34 #endif 35 #ifndef SEC_FIRMWARE_TARGET_EL 36 #define SEC_FIRMWARE_TARGET_EL 2 37 #endif 38 39 static int sec_firmware_get_data(const void *sec_firmware_img, 40 const void **data, size_t *size) 41 { 42 int conf_node_off, fw_node_off; 43 char *conf_node_name = NULL; 44 char *desc; 45 int ret; 46 47 conf_node_name = SEC_FIRMEWARE_FIT_CNF_NAME; 48 49 conf_node_off = fit_conf_get_node(sec_firmware_img, conf_node_name); 50 if (conf_node_off < 0) { 51 printf("SEC Firmware: %s: no such config\n", conf_node_name); 52 return -ENOENT; 53 } 54 55 fw_node_off = fit_conf_get_prop_node(sec_firmware_img, conf_node_off, 56 SEC_FIRMWARE_FIT_IMAGE); 57 if (fw_node_off < 0) { 58 printf("SEC Firmware: No '%s' in config\n", 59 SEC_FIRMWARE_FIT_IMAGE); 60 return -ENOLINK; 61 } 62 63 /* Verify secure firmware image */ 64 if (!(fit_image_verify(sec_firmware_img, fw_node_off))) { 65 printf("SEC Firmware: Bad firmware image (bad CRC)\n"); 66 return -EINVAL; 67 } 68 69 if (fit_image_get_data(sec_firmware_img, fw_node_off, data, size)) { 70 printf("SEC Firmware: Can't get %s subimage data/size", 71 SEC_FIRMWARE_FIT_IMAGE); 72 return -ENOENT; 73 } 74 75 ret = fit_get_desc(sec_firmware_img, fw_node_off, &desc); 76 if (ret) 77 printf("SEC Firmware: Can't get description\n"); 78 else 79 printf("%s\n", desc); 80 81 return ret; 82 } 83 84 /* 85 * SEC Firmware FIT image parser checks if the image is in FIT 86 * format, verifies integrity of the image and calculates raw 87 * image address and size values. 88 * 89 * Returns 0 on success and a negative errno on error task fail. 90 */ 91 static int sec_firmware_parse_image(const void *sec_firmware_img, 92 const void **raw_image_addr, 93 size_t *raw_image_size) 94 { 95 int ret; 96 97 ret = sec_firmware_get_data(sec_firmware_img, raw_image_addr, 98 raw_image_size); 99 if (ret) 100 return ret; 101 102 debug("SEC Firmware: raw_image_addr = 0x%p, raw_image_size = 0x%lx\n", 103 *raw_image_addr, *raw_image_size); 104 105 return 0; 106 } 107 108 static int sec_firmware_copy_image(const char *title, 109 u64 image_addr, u32 image_size, u64 sec_firmware) 110 { 111 debug("%s copied to address 0x%p\n", title, (void *)sec_firmware); 112 memcpy((void *)sec_firmware, (void *)image_addr, image_size); 113 flush_dcache_range(sec_firmware, sec_firmware + image_size); 114 115 return 0; 116 } 117 118 /* 119 * This function will parse the SEC Firmware image, and then load it 120 * to secure memory. 121 */ 122 static int sec_firmware_load_image(const void *sec_firmware_img) 123 { 124 const void *raw_image_addr; 125 size_t raw_image_size = 0; 126 int ret; 127 128 /* 129 * The Excetpion Level must be EL3 to load and initialize 130 * the SEC Firmware. 131 */ 132 if (current_el() != 3) { 133 ret = -EACCES; 134 goto out; 135 } 136 137 #ifdef CONFIG_SYS_MEM_RESERVE_SECURE 138 /* 139 * The SEC Firmware must be stored in secure memory. 140 * Append SEC Firmware to secure mmu table. 141 */ 142 if (!(gd->arch.secure_ram & MEM_RESERVE_SECURE_MAINTAINED)) { 143 ret = -ENXIO; 144 goto out; 145 } 146 147 sec_firmware_addr = (gd->arch.secure_ram & MEM_RESERVE_SECURE_ADDR_MASK) + 148 gd->arch.tlb_size; 149 #else 150 #error "The CONFIG_SYS_MEM_RESERVE_SECURE must be defined when enabled SEC Firmware support" 151 #endif 152 153 /* Align SEC Firmware base address to 4K */ 154 sec_firmware_addr = (sec_firmware_addr + 0xfff) & ~0xfff; 155 debug("SEC Firmware: Load address: 0x%llx\n", 156 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 157 158 ret = sec_firmware_parse_image(sec_firmware_img, &raw_image_addr, 159 &raw_image_size); 160 if (ret) 161 goto out; 162 163 /* TODO: 164 * Check if the end addr of SEC Firmware has been extend the secure 165 * memory. 166 */ 167 168 /* Copy the secure firmware to secure memory */ 169 ret = sec_firmware_copy_image("SEC Firmware", (u64)raw_image_addr, 170 raw_image_size, sec_firmware_addr & 171 SEC_FIRMWARE_ADDR_MASK); 172 if (ret) 173 goto out; 174 175 sec_firmware_addr |= SEC_FIRMWARE_LOADED; 176 debug("SEC Firmware: Entry point: 0x%llx\n", 177 sec_firmware_addr & SEC_FIRMWARE_ADDR_MASK); 178 179 return 0; 180 181 out: 182 printf("SEC Firmware: error (%d)\n", ret); 183 sec_firmware_addr = 0; 184 185 return ret; 186 } 187 188 static int sec_firmware_entry(u32 *eret_hold_l, u32 *eret_hold_h) 189 { 190 const void *entry = (void *)(sec_firmware_addr & 191 SEC_FIRMWARE_ADDR_MASK); 192 193 return _sec_firmware_entry(entry, eret_hold_l, eret_hold_h); 194 } 195 196 /* Check the secure firmware FIT image */ 197 __weak bool sec_firmware_is_valid(const void *sec_firmware_img) 198 { 199 if (fdt_check_header(sec_firmware_img)) { 200 printf("SEC Firmware: Bad firmware image (not a FIT image)\n"); 201 return false; 202 } 203 204 if (!fit_check_format(sec_firmware_img)) { 205 printf("SEC Firmware: Bad firmware image (bad FIT header)\n"); 206 return false; 207 } 208 209 return true; 210 } 211 212 #ifdef CONFIG_SEC_FIRMWARE_ARMV8_PSCI 213 /* 214 * The PSCI_VERSION function is added from PSCI v0.2. When the PSCI 215 * v0.1 received this function, the NOT_SUPPORTED (0xffff_ffff) error 216 * number will be returned according to SMC Calling Conventions. But 217 * when getting the NOT_SUPPORTED error number, we cannot ensure if 218 * the PSCI version is v0.1 or other error occurred. So, PSCI v0.1 219 * won't be supported by this framework. 220 * And if the secure firmware isn't running, return NOT_SUPPORTED. 221 * 222 * The return value on success is PSCI version in format 223 * major[31:16]:minor[15:0]. 224 */ 225 unsigned int sec_firmware_support_psci_version(void) 226 { 227 if (current_el() == SEC_FIRMWARE_TARGET_EL) 228 return _sec_firmware_support_psci_version(); 229 230 return PSCI_INVALID_VER; 231 } 232 #endif 233 234 /* 235 * Check with sec_firmware if it supports random number generation 236 * via HW RNG 237 * 238 * The return value will be true if it is supported 239 */ 240 bool sec_firmware_support_hwrng(void) 241 { 242 uint8_t rand[8]; 243 if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) { 244 if (!sec_firmware_get_random(rand, 8)) 245 return true; 246 } 247 248 return false; 249 } 250 251 /* 252 * sec_firmware_get_random - Get a random number from SEC Firmware 253 * @rand: random number buffer to be filled 254 * @bytes: Number of bytes of random number to be supported 255 * @eret: -1 in case of error, 0 for success 256 */ 257 int sec_firmware_get_random(uint8_t *rand, int bytes) 258 { 259 unsigned long long num; 260 struct pt_regs regs; 261 int param1; 262 263 if (!bytes || bytes > 8) { 264 printf("Max Random bytes genration supported is 8\n"); 265 return -1; 266 } 267 #define SIP_RNG_64 0xC200FF11 268 regs.regs[0] = SIP_RNG_64; 269 270 if (bytes <= 4) 271 param1 = 0; 272 else 273 param1 = 1; 274 regs.regs[1] = param1; 275 276 smc_call(®s); 277 278 if (regs.regs[0]) 279 return -1; 280 281 num = regs.regs[1]; 282 memcpy(rand, &num, bytes); 283 284 return 0; 285 } 286 287 /* 288 * sec_firmware_init - Initialize the SEC Firmware 289 * @sec_firmware_img: the SEC Firmware image address 290 * @eret_hold_l: the address to hold exception return address low 291 * @eret_hold_h: the address to hold exception return address high 292 */ 293 int sec_firmware_init(const void *sec_firmware_img, 294 u32 *eret_hold_l, 295 u32 *eret_hold_h) 296 { 297 int ret; 298 299 if (!sec_firmware_is_valid(sec_firmware_img)) 300 return -EINVAL; 301 302 ret = sec_firmware_load_image(sec_firmware_img); 303 if (ret) { 304 printf("SEC Firmware: Failed to load image\n"); 305 return ret; 306 } else if (sec_firmware_addr & SEC_FIRMWARE_LOADED) { 307 ret = sec_firmware_entry(eret_hold_l, eret_hold_h); 308 if (ret) { 309 printf("SEC Firmware: Failed to initialize\n"); 310 return ret; 311 } 312 } 313 314 debug("SEC Firmware: Return from SEC Firmware: current_el = %d\n", 315 current_el()); 316 317 /* 318 * The PE will be turned into target EL when returned from 319 * SEC Firmware. 320 */ 321 if (current_el() != SEC_FIRMWARE_TARGET_EL) 322 return -EACCES; 323 324 sec_firmware_addr |= SEC_FIRMWARE_RUNNING; 325 326 /* Set exception table and enable caches if it isn't EL3 */ 327 if (current_el() != 3) { 328 c_runtime_cpu_setup(); 329 enable_caches(); 330 } 331 332 return 0; 333 } 334 335 /* 336 * fdt_fix_kaslr - Add kalsr-seed node in Device tree 337 * @fdt: Device tree 338 * @eret: 0 in case of error, 1 for success 339 */ 340 int fdt_fixup_kaslr(void *fdt) 341 { 342 int nodeoffset; 343 int err, ret = 0; 344 u8 rand[8]; 345 346 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT) 347 /* Check if random seed generation is supported */ 348 if (sec_firmware_support_hwrng() == false) 349 return 0; 350 351 ret = sec_firmware_get_random(rand, 8); 352 if (ret < 0) { 353 printf("WARNING: No random number to set kaslr-seed\n"); 354 return 0; 355 } 356 357 err = fdt_check_header(fdt); 358 if (err < 0) { 359 printf("fdt_chosen: %s\n", fdt_strerror(err)); 360 return 0; 361 } 362 363 /* find or create "/chosen" node. */ 364 nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen"); 365 if (nodeoffset < 0) 366 return 0; 367 368 err = fdt_setprop(fdt, nodeoffset, "kaslr-seed", rand, 369 sizeof(rand)); 370 if (err < 0) { 371 printf("WARNING: can't set kaslr-seed %s.\n", 372 fdt_strerror(err)); 373 return 0; 374 } 375 ret = 1; 376 #endif 377 378 return ret; 379 } 380