1 // SPDX-License-Identifier: GPL-2.0-only
7  *  GK 2/5/95  -  Changed to support mounting root fs via NFS
9  *  Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
122  * two things - IRQ must not be enabled before the flag is cleared and some
132  * Boot command-line arguments
140 /* Untouched command line saved by arch-specific code. */
185 	reset_devices = 1;  in set_reset_devices()
186 	return 1;  in set_reset_devices()
202 		int n = strlen(p->str);  in obsolete_checksetup()
203 		if (parameqn(line, p->str, n)) {  in obsolete_checksetup()
204 			if (p->early) {  in obsolete_checksetup()
211 			} else if (!p->setup_func) {  in obsolete_checksetup()
213 					p->str);  in obsolete_checksetup()
215 			} else if (p->setup_func(line + n))  in obsolete_checksetup()
228 unsigned long loops_per_jiffy = (1<<12);
260 	return -EINVAL;  in loglevel()
276 	data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;  in get_boot_config_from_initrd()
284 		data--;  in get_boot_config_from_initrd()
289 	hdr = (u32 *)(data - 8);  in get_boot_config_from_initrd()
291 	csum = le32_to_cpu(hdr[1]);  in get_boot_config_from_initrd()
293 	data = ((void *)hdr) - size;  in get_boot_config_from_initrd()
296 			size, initrd_end - initrd_start);  in get_boot_config_from_initrd()
323 #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
362 	return buf - (end - size);  in xbc_snprint_cmdline()
382 	new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);  in xbc_make_cmdline()
388 	ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);  in xbc_make_cmdline()
391 		memblock_free(new_cmdline, len + 1);  in xbc_make_cmdline()
434 	/* parse_args() stops at the next param of '--' and returns an address */  in setup_boot_config()
436 		initargs_offs = err - tmp_cmdline;  in setup_boot_config()
506 		if (val == param+strlen(param)+1)  in repair_env_string()
507 			val[-1] = '=';  in repair_env_string()
509 			val[-2] = '=';  in repair_env_string()
510 			memmove(val-1, val, strlen(val)+1);  in repair_env_string()
516 /* Anything after -- gets handed straight to init. */
553 	/* Handle obsolete-style parameters */  in unknown_bootoption()
572 			if (!strncmp(param, envp_init[i], len+1))  in unknown_bootoption()
601 	for (i = 1; i < MAX_INIT_ARGS; i++)  in init_setup()
603 	return 1;  in init_setup()
613 	for (i = 1; i < MAX_INIT_ARGS; i++)  in rdinit_setup()
615 	return 1;  in rdinit_setup()
632 	size_t len, xlen = 0, ilen = 0;  in setup_command_line()  local
635 		xlen = strlen(extra_command_line);  in setup_command_line()
638 		ilen = strlen(extra_init_args) + 4; /* for " -- " */  in setup_command_line()
641 	len = xlen + strlen(boot_command_line) + ilen + 1;  in setup_command_line()
647 	len = xlen + strlen(command_line) + 1;  in setup_command_line()
653 	if (xlen) {  in setup_command_line()
662 	strcpy(saved_command_line + xlen, boot_command_line);  in setup_command_line()
663 	strcpy(static_command_line + xlen, command_line);  in setup_command_line()
671 		 * " -- "[bootconfig init-param][cmdline init-param]  in setup_command_line()
674 			len = xlen + initargs_offs;  in setup_command_line()
676 			len += ilen - 4;	/* strlen(extra_init_args) */  in setup_command_line()
678 				boot_command_line + initargs_offs - 1);  in setup_command_line()
681 			strcpy(saved_command_line + len, " -- ");  in setup_command_line()
691  * We need to finalize in a non-__init function or else race conditions
696  * gcc-3.4 accidentally inlines this function, so use noinline.
708 	 * We need to spawn init first so that it obtains pid 1, however  in rest_init()
720 	tsk->flags |= PF_NO_SETAFFINITY;  in rest_init()
757 		if ((p->early && parameq(param, p->str)) ||  in do_early_param()
759 		     strcmp(p->str, "earlycon") == 0)  in do_early_param()
761 			if (p->setup_func(val) != 0)  in do_early_param()
787 	done = 1;  in parse_early_param()
853 	if (panic_later || (!argv_init[1] && !envp_init[2]))  in print_unknown_bootoptions()
860 	len = 1; /* null terminator */  in print_unknown_bootoptions()
861 	for (p = &argv_init[1]; *p; p++) {  in print_unknown_bootoptions()
878 	for (p = &argv_init[1]; *p; p++)  in print_unknown_bootoptions()
883 	/* Start at unknown_options[1] to skip the initial space */  in print_unknown_bootoptions()
885 		&unknown_options[1]);  in print_unknown_bootoptions()
934 	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */  in start_kernel()
943 				  __stop___param - __start___param,  in start_kernel()
944 				  -1, -1, NULL, &unknown_bootoption);  in start_kernel()
947 		parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,  in start_kernel()
951 			   NULL, 0, -1, -1, NULL, set_init_arg);  in start_kernel()
953 	/* Architectural and non-timekeeping rng init, before allocator init */  in start_kernel()
974 	 * time - but meanwhile we still have a functioning scheduler.  in start_kernel()
986 	 * workqueue to take non-housekeeping into account.  in start_kernel()
1049 	 * to self-test [hard/soft]-irqs on/off lock inversion bugs  in start_kernel()
1057 		pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",  in start_kernel()
1104 	/* Do the rest non-__init'ed, we're now alive */  in start_kernel()
1108 	 * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10  in start_kernel()
1122  * cannot do it again - but we do need CONFIG_CONSTRUCTORS  in do_ctors()
1146 	/* str argument is a comma-separated list of functions */  in initcall_blacklist()
1156 			entry->buf = memblock_alloc(strlen(str_entry) + 1,  in initcall_blacklist()
1158 			if (!entry->buf)  in initcall_blacklist()
1160 				      __func__, strlen(str_entry) + 1);  in initcall_blacklist()
1161 			strcpy(entry->buf, str_entry);  in initcall_blacklist()
1162 			list_add(&entry->next, &blacklisted_initcalls);  in initcall_blacklist()
1166 	return 1;  in initcall_blacklist()
1183 	 * displayed for built-in init functions.  Strip off the [module_name].  in initcall_blacklisted()
1188 		if (!strcmp(fn_name, entry->buf)) {  in initcall_blacklisted()
1266 		return -EPERM;  in do_one_initcall()
1325 		   __stop___param - __start___param,  in do_initcall_level()
1330 	for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)  in do_initcall_level()
1337 	size_t len = saved_command_line_len + 1;  in do_initcalls()
1344 	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {  in do_initcalls()
1399 	if (ret && ret != -ENOENT) {  in try_to_run_init_process()
1465 	 * Wait until kthreadd is all set-up.  in kernel_init()
1482 	 * Kernel mappings are now finalized - update the userspace page-table  in kernel_init()
1532 	      "See Linux Documentation/admin-guide/init.rst for guidance.");  in kernel_init()
1599 	 * initmem segments and start the user-mode stuff..  in kernel_init_freeable()