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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 | /* * Copyright (c) 2010-2014 Wind River Systems, Inc. * * SPDX-License-Identifier: Apache-2.0 */ /** * @file * @brief Kernel initialization module * * This module contains routines that are used to initialize the kernel. */ #include <zephyr.h> #include <offsets_short.h> #include <kernel.h> #include <sys/printk.h> #include <debug/stack.h> #include <random/rand32.h> #include <linker/sections.h> #include <toolchain.h> #include <kernel_structs.h> #include <device.h> #include <init.h> #include <linker/linker-defs.h> #include <ksched.h> #include <string.h> #include <sys/dlist.h> #include <kernel_internal.h> #include <drivers/entropy.h> #include <logging/log_ctrl.h> #include <tracing/tracing.h> #include <stdbool.h> #include <debug/gcov.h> #include <kswap.h> #include <timing/timing.h> #include <logging/log.h> LOG_MODULE_REGISTER(os, CONFIG_KERNEL_LOG_LEVEL); /* the only struct z_kernel instance */ struct z_kernel _kernel; /* init/main and idle threads */ K_THREAD_PINNED_STACK_DEFINE(z_main_stack, CONFIG_MAIN_STACK_SIZE); struct k_thread z_main_thread; #ifdef CONFIG_MULTITHREADING __pinned_bss struct k_thread z_idle_threads[CONFIG_MP_NUM_CPUS]; static K_KERNEL_PINNED_STACK_ARRAY_DEFINE(z_idle_stacks, CONFIG_MP_NUM_CPUS, CONFIG_IDLE_STACK_SIZE); #endif /* CONFIG_MULTITHREADING */ /* * storage space for the interrupt stack * * Note: This area is used as the system stack during kernel initialization, * since the kernel hasn't yet set up its own stack areas. The dual purposing * of this area is safe since interrupts are disabled until the kernel context * switches to the init thread. */ K_KERNEL_PINNED_STACK_ARRAY_DEFINE(z_interrupt_stacks, CONFIG_MP_NUM_CPUS, CONFIG_ISR_STACK_SIZE); extern void idle(void *unused1, void *unused2, void *unused3); /* LCOV_EXCL_START * * This code is called so early in the boot process that code coverage * doesn't work properly. In addition, not all arches call this code, * some like x86 do this with optimized assembly */ /** * * @brief Clear BSS * * This routine clears the BSS region, so all bytes are 0. * * @return N/A */ __boot_func void z_bss_zero(void) { (void)memset(__bss_start, 0, __bss_end - __bss_start); #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_ccm), okay) (void)memset(&__ccm_bss_start, 0, ((uint32_t) &__ccm_bss_end - (uint32_t) &__ccm_bss_start)); #endif #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay) (void)memset(&__dtcm_bss_start, 0, ((uint32_t) &__dtcm_bss_end - (uint32_t) &__dtcm_bss_start)); #endif #ifdef CONFIG_CODE_DATA_RELOCATION extern void bss_zeroing_relocation(void); bss_zeroing_relocation(); #endif /* CONFIG_CODE_DATA_RELOCATION */ #ifdef CONFIG_COVERAGE_GCOV (void)memset(&__gcov_bss_start, 0, ((uintptr_t) &__gcov_bss_end - (uintptr_t) &__gcov_bss_start)); #endif } #ifdef CONFIG_LINKER_USE_BOOT_SECTION /** * @brief Clear BSS within the bot region * * This routine clears the BSS within the boot region. * This is separate from z_bss_zero() as boot region may * contain symbols required for the boot process before * paging is initialized. */ __boot_func void z_bss_zero_boot(void) { (void)memset(&lnkr_boot_bss_start, 0, (uintptr_t)&lnkr_boot_bss_end - (uintptr_t)&lnkr_boot_bss_start); } #endif /* CONFIG_LINKER_USE_BOOT_SECTION */ #ifdef CONFIG_LINKER_USE_PINNED_SECTION /** * @brief Clear BSS within the pinned region * * This routine clears the BSS within the pinned region. * This is separate from z_bss_zero() as pinned region may * contain symbols required for the boot process before * paging is initialized. */ #ifdef CONFIG_LINKER_USE_BOOT_SECTION __boot_func #else __pinned_func #endif void z_bss_zero_pinned(void) { (void)memset(&lnkr_pinned_bss_start, 0, (uintptr_t)&lnkr_pinned_bss_end - (uintptr_t)&lnkr_pinned_bss_start); } #endif /* CONFIG_LINKER_USE_PINNED_SECTION */ #ifdef CONFIG_STACK_CANARIES extern volatile uintptr_t __stack_chk_guard; #endif /* CONFIG_STACK_CANARIES */ /* LCOV_EXCL_STOP */ __pinned_bss bool z_sys_post_kernel; extern void boot_banner(void); /** * * @brief Mainline for kernel's background thread * * This routine completes kernel initialization by invoking the remaining * init functions, then invokes application's main() routine. * * @return N/A */ __boot_func static void bg_thread_main(void *unused1, void *unused2, void *unused3) { ARG_UNUSED(unused1); ARG_UNUSED(unused2); ARG_UNUSED(unused3); #ifdef CONFIG_MMU /* Invoked here such that backing store or eviction algorithms may * initialize kernel objects, and that all POST_KERNEL and later tasks * may perform memory management tasks (except for z_phys_map() which * is allowed at any time) */ z_mem_manage_init(); #endif /* CONFIG_MMU */ z_sys_post_kernel = true; z_sys_init_run_level(_SYS_INIT_LEVEL_POST_KERNEL); #if CONFIG_STACK_POINTER_RANDOM z_stack_adjust_initialized = 1; #endif boot_banner(); #if defined(CONFIG_CPLUSPLUS) && !defined(CONFIG_ARCH_POSIX) void z_cpp_init_static(void); z_cpp_init_static(); #endif /* Final init level before app starts */ z_sys_init_run_level(_SYS_INIT_LEVEL_APPLICATION); z_init_static_threads(); #ifdef CONFIG_KERNEL_COHERENCE __ASSERT_NO_MSG(arch_mem_coherent(&_kernel)); #endif #ifdef CONFIG_SMP z_smp_init(); z_sys_init_run_level(_SYS_INIT_LEVEL_SMP); #endif #ifdef CONFIG_MMU z_mem_manage_boot_finish(); #endif /* CONFIG_MMU */ extern void main(void); main(); /* Mark nonessenrial since main() has no more work to do */ z_main_thread.base.user_options &= ~K_ESSENTIAL; #ifdef CONFIG_COVERAGE_DUMP /* Dump coverage data once the main() has exited. */ gcov_coverage_dump(); #endif } /* LCOV_EXCL_LINE ... because we just dumped final coverage data */ #if defined(CONFIG_MULTITHREADING) __boot_func static void init_idle_thread(int i) { struct k_thread *thread = &z_idle_threads[i]; k_thread_stack_t *stack = z_idle_stacks[i]; #ifdef CONFIG_THREAD_NAME char tname[8]; snprintk(tname, 8, "idle %02d", i); #else char *tname = NULL; #endif /* CONFIG_THREAD_NAME */ z_setup_new_thread(thread, stack, CONFIG_IDLE_STACK_SIZE, idle, &_kernel.cpus[i], NULL, NULL, K_IDLE_PRIO, K_ESSENTIAL, tname); z_mark_thread_as_started(thread); #ifdef CONFIG_SMP thread->base.is_idle = 1U; #endif } void z_reinit_idle_thread(int i) { init_idle_thread(i); } /** * * @brief Initializes kernel data structures * * This routine initializes various kernel data structures, including * the init and idle threads and any architecture-specific initialization. * * Note that all fields of "_kernel" are set to zero on entry, which may * be all the initialization many of them require. * * @return initial stack pointer for the main thread */ __boot_func static char *prepare_multithreading(void) { char *stack_ptr; /* _kernel.ready_q is all zeroes */ z_sched_init(); #ifndef CONFIG_SMP /* * prime the cache with the main thread since: * * - the cache can never be NULL * - the main thread will be the one to run first * - no other thread is initialized yet and thus their priority fields * contain garbage, which would prevent the cache loading algorithm * to work as intended */ _kernel.ready_q.cache = &z_main_thread; #endif stack_ptr = z_setup_new_thread(&z_main_thread, z_main_stack, CONFIG_MAIN_STACK_SIZE, bg_thread_main, NULL, NULL, NULL, CONFIG_MAIN_THREAD_PRIORITY, K_ESSENTIAL, "main"); z_mark_thread_as_started(&z_main_thread); z_ready_thread(&z_main_thread); for (int i = 0; i < CONFIG_MP_NUM_CPUS; i++) { init_idle_thread(i); _kernel.cpus[i].idle_thread = &z_idle_threads[i]; _kernel.cpus[i].id = i; _kernel.cpus[i].irq_stack = (Z_KERNEL_STACK_BUFFER(z_interrupt_stacks[i]) + K_KERNEL_STACK_SIZEOF(z_interrupt_stacks[i])); } return stack_ptr; } __boot_func static FUNC_NORETURN void switch_to_main_thread(char *stack_ptr) { #ifdef CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN arch_switch_to_main_thread(&z_main_thread, stack_ptr, bg_thread_main); #else ARG_UNUSED(stack_ptr); /* * Context switch to main task (entry function is _main()): the * current fake thread is not on a wait queue or ready queue, so it * will never be rescheduled in. */ z_swap_unlocked(); #endif CODE_UNREACHABLE; /* LCOV_EXCL_LINE */ } #endif /* CONFIG_MULTITHREADING */ #if defined(CONFIG_ENTROPY_HAS_DRIVER) || defined(CONFIG_TEST_RANDOM_GENERATOR) __boot_func void z_early_boot_rand_get(uint8_t *buf, size_t length) { int n = sizeof(uint32_t); #ifdef CONFIG_ENTROPY_HAS_DRIVER const struct device *entropy = device_get_binding(DT_CHOSEN_ZEPHYR_ENTROPY_LABEL); int rc; if (entropy == NULL) { goto sys_rand_fallback; } /* Try to see if driver provides an ISR-specific API */ rc = entropy_get_entropy_isr(entropy, buf, length, ENTROPY_BUSYWAIT); if (rc == -ENOTSUP) { /* Driver does not provide an ISR-specific API, assume it can * be called from ISR context */ rc = entropy_get_entropy(entropy, buf, length); } if (rc >= 0) { return; } /* Fall through to fallback */ sys_rand_fallback: #endif /* FIXME: this assumes sys_rand32_get() won't use any synchronization * primitive, like semaphores or mutexes. It's too early in the boot * process to use any of them. Ideally, only the path where entropy * devices are available should be built, this is only a fallback for * those devices without a HWRNG entropy driver. */ while (length > 0U) { uint32_t rndbits; uint8_t *p_rndbits = (uint8_t *)&rndbits; rndbits = sys_rand32_get(); if (length < sizeof(uint32_t)) { n = length; } for (int i = 0; i < n; i++) { *buf = *p_rndbits; buf++; p_rndbits++; } length -= n; } } /* defined(CONFIG_ENTROPY_HAS_DRIVER) || defined(CONFIG_TEST_RANDOM_GENERATOR) */ #endif /** * * @brief Initialize kernel * * This routine is invoked when the system is ready to run C code. The * processor must be running in 32-bit mode, and the BSS must have been * cleared/zeroed. * * @return Does not return */ __boot_func FUNC_NORETURN void z_cstart(void) { /* gcov hook needed to get the coverage report.*/ gcov_static_init(); LOG_CORE_INIT(); /* perform any architecture-specific initialization */ arch_kernel_init(); #if defined(CONFIG_MULTITHREADING) /* Note: The z_ready_thread() call in prepare_multithreading() requires * a dummy thread even if CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN=y */ struct k_thread dummy_thread; z_dummy_thread_init(&dummy_thread); #endif /* do any necessary initialization of static devices */ z_device_state_init(); /* perform basic hardware initialization */ z_sys_init_run_level(_SYS_INIT_LEVEL_PRE_KERNEL_1); z_sys_init_run_level(_SYS_INIT_LEVEL_PRE_KERNEL_2); #ifdef CONFIG_STACK_CANARIES uintptr_t stack_guard; z_early_boot_rand_get((uint8_t *)&stack_guard, sizeof(stack_guard)); __stack_chk_guard = stack_guard; __stack_chk_guard <<= 8; #endif /* CONFIG_STACK_CANARIES */ #ifdef CONFIG_TIMING_FUNCTIONS_NEED_AT_BOOT timing_init(); timing_start(); #endif #ifdef CONFIG_MULTITHREADING switch_to_main_thread(prepare_multithreading()); #else #ifdef ARCH_SWITCH_TO_MAIN_NO_MULTITHREADING /* Custom ARCH-specific routine to switch to main() * in the case of no multi-threading. */ ARCH_SWITCH_TO_MAIN_NO_MULTITHREADING(bg_thread_main, NULL, NULL, NULL); #else bg_thread_main(NULL, NULL, NULL); /* LCOV_EXCL_START * We've already dumped coverage data at this point. */ irq_lock(); while (true) { } /* LCOV_EXCL_STOP */ #endif #endif /* CONFIG_MULTITHREADING */ /* * Compiler can't tell that the above routines won't return and issues * a warning unless we explicitly tell it that control never gets this * far. */ CODE_UNREACHABLE; /* LCOV_EXCL_LINE */ } |