// SPDX-License-Identifier: GPL-2.0-only/* * linux/init/main.c * * Copyright (C) 1991, 1992 Linus Torvalds * * GK 2/5/95 - Changed to support mounting root fs via NFS * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 * Simplified starting of init: Michael A. Griffith <grif@acm.org> */ #define DEBUG /* Enable initcall_debug */ #include <linux/types.h>#include <linux/export.h>#include <linux/extable.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/binfmts.h>#include <linux/kernel.h>#include <linux/syscalls.h>#include <linux/stackprotector.h>#include <linux/string.h>#include <linux/ctype.h>#include <linux/delay.h>#include <linux/ioport.h>#include <linux/init.h>#include <linux/initrd.h>#include <linux/memblock.h>#include <linux/acpi.h>#include <linux/bootconfig.h>#include <linux/console.h>#include <linux/nmi.h>#include <linux/percpu.h>#include <linux/kmod.h>#include <linux/kprobes.h>#include <linux/kmsan.h>#include <linux/ksysfs.h>#include <linux/vmalloc.h>#include <linux/kernel_stat.h>#include <linux/start_kernel.h>#include <linux/security.h>#include <linux/smp.h>#include <linux/profile.h>#include <linux/kfence.h>#include <linux/rcupdate.h>#include <linux/srcu.h>#include <linux/moduleparam.h>#include <linux/kallsyms.h>#include <linux/buildid.h>#include <linux/writeback.h>#include <linux/cpu.h>#include <linux/cpuset.h>#include <linux/memcontrol.h>#include <linux/cgroup.h>#include <linux/tick.h>#include <linux/sched/isolation.h>#include <linux/interrupt.h>#include <linux/taskstats_kern.h>#include <linux/delayacct.h>#include <linux/unistd.h>#include <linux/utsname.h>#include <linux/rmap.h>#include <linux/mempolicy.h>#include <linux/key.h>#include <linux/debug_locks.h>#include <linux/debugobjects.h>#include <linux/lockdep.h>#include <linux/kmemleak.h>#include <linux/padata.h>#include <linux/pid_namespace.h>#include <linux/device/driver.h>#include <linux/kthread.h>#include <linux/sched.h>#include <linux/sched/init.h>#include <linux/signal.h>#include <linux/idr.h>#include <linux/kgdb.h>#include <linux/ftrace.h>#include <linux/async.h>#include <linux/shmem_fs.h>#include <linux/slab.h>#include <linux/perf_event.h>#include <linux/ptrace.h>#include <linux/pti.h>#include <linux/blkdev.h>#include <linux/sched/clock.h>#include <linux/sched/task.h>#include <linux/sched/task_stack.h>#include <linux/context_tracking.h>#include <linux/random.h>#include <linux/moduleloader.h>#include <linux/list.h>#include <linux/integrity.h>#include <linux/proc_ns.h>#include <linux/io.h>#include <linux/cache.h>#include <linux/rodata_test.h>#include <linux/jump_label.h>#include <linux/kcsan.h>#include <linux/init_syscalls.h>#include <linux/stackdepot.h>#include <linux/randomize_kstack.h>#include <linux/pidfs.h>#include <linux/fs_struct.h>#include <linux/ptdump.h>#include <linux/time_namespace.h>#include <linux/unaligned.h>#include <linux/vdso_datastore.h>#include <net/net_namespace.h> #include <asm/io.h>#include <asm/setup.h>#include <asm/sections.h>#include <asm/cacheflush.h> #define CREATE_TRACE_POINTS#include <trace/events/initcall.h> #include <kunit/test.h> static int kernel_init(void *); /* * Debug helper: via this flag we know that we are in 'early bootup code' * where only the boot processor is running with IRQ disabled. This means * two things - IRQ must not be enabled before the flag is cleared and some * operations which are not allowed with IRQ disabled are allowed while the * flag is set. */bool early_boot_irqs_disabled __read_mostly; enum system_states system_state __read_mostly;EXPORT_SYMBOL(system_state); /* * Boot command-line arguments */#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT /* Default late time init is NULL. archs can override this later. */void (*__initdata late_time_init)(void); /* Untouched command line saved by arch-specific code. */char __initdata boot_command_line[COMMAND_LINE_SIZE];/* Untouched saved command line (eg. for /proc) */char *saved_command_line __ro_after_init;unsigned int saved_command_line_len __ro_after_init;/* Command line for parameter parsing */static char *static_command_line;/* Untouched extra command line */static char *extra_command_line;/* Extra init arguments */static char *extra_init_args; #ifdef CONFIG_BOOT_CONFIG/* Is bootconfig on command line? */static bool bootconfig_found;static size_t initargs_offs;#else# define bootconfig_found false# define initargs_offs 0#endif static char *execute_command;static char *ramdisk_execute_command = "/init";static bool __initdata ramdisk_execute_command_set; /* * Used to generate warnings if static_key manipulation functions are used * before jump_label_init is called. */bool static_key_initialized __read_mostly;EXPORT_SYMBOL_GPL(static_key_initialized); /* * If set, this is an indication to the drivers that reset the underlying * device before going ahead with the initialization otherwise driver might * rely on the BIOS and skip the reset operation. * * This is useful if kernel is booting in an unreliable environment. * For ex. kdump situation where previous kernel has crashed, BIOS has been * skipped and devices will be in unknown state. */unsigned int reset_devices;EXPORT_SYMBOL(reset_devices); static int __init set_reset_devices(char *str){ reset_devices = 1; return 1;} __setup("reset_devices", set_reset_devices); static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };static const char *panic_later, *panic_param; static bool __init obsolete_checksetup(char *line){ const struct obs_kernel_param *p; bool had_early_param = false; p = __setup_start; do { int n = strlen(p->str); if (parameqn(line, p->str, n)) { if (p->early) { /* Already done in parse_early_param? * (Needs exact match on param part). * Keep iterating, as we can have early * params and __setups of same names 8( */ if (line[n] == '\0' || line[n] == '=') had_early_param = true; } else if (!p->setup_func) { pr_warn("Parameter %s is obsolete, ignored\n", p->str); return true; } else if (p->setup_func(line + n)) return true; } p++; } while (p < __setup_end); return had_early_param;} /* * This should be approx 2 Bo*oMips to start (note initial shift), and will * still work even if initially too large, it will just take slightly longer */unsigned long loops_per_jiffy = (1<<12);EXPORT_SYMBOL(loops_per_jiffy); static int __init debug_kernel(char *str){ console_loglevel = CONSOLE_LOGLEVEL_DEBUG; return 0;} static int __init quiet_kernel(char *str){ console_loglevel = CONSOLE_LOGLEVEL_QUIET; return 0;} early_param("debug", debug_kernel);early_param("quiet", quiet_kernel); static int __init loglevel(char *str){ int newlevel; /* * Only update loglevel value when a correct setting was passed, * to prevent blind crashes (when loglevel being set to 0) that * are quite hard to debug */ if (get_option(&str, &newlevel)) { console_loglevel = newlevel; return 0; } return -EINVAL;} early_param("loglevel", loglevel); #ifdef CONFIG_BLK_DEV_INITRDstatic void * __init get_boot_config_from_initrd(size_t *_size){ u32 size, csum; char *data; u8 *hdr; int i; if (!initrd_end) return NULL; data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; /* * Since Grub may align the size of initrd to 4, we must * check the preceding 3 bytes as well. */ for (i = 0; i < 4; i++) { if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) goto found; data--; } return NULL; found: hdr = (u8 *)(data - 8); size = get_unaligned_le32(hdr); csum = get_unaligned_le32(hdr + 4); data = ((void *)hdr) - size; if ((unsigned long)data < initrd_start) { pr_err("bootconfig size %d is greater than initrd size %ld\n", size, initrd_end - initrd_start); return NULL; } if (xbc_calc_checksum(data, size) != csum) { pr_err("bootconfig checksum failed\n"); return NULL; } /* Remove bootconfig from initramfs/initrd */ initrd_end = (unsigned long)data; if (_size) *_size = size; return data;}#elsestatic void * __init get_boot_config_from_initrd(size_t *_size){ return NULL;}#endif #ifdef CONFIG_BOOT_CONFIG /* Make an extra command line under given key word */static char * __init xbc_make_cmdline(const char *key){ struct xbc_node *root; char *new_cmdline; int ret, len = 0; root = xbc_find_node(key); if (!root) return NULL; /* Count required buffer size */ len = xbc_snprint_cmdline(NULL, 0, root); if (len <= 0) return NULL; new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); if (!new_cmdline) { pr_err("Failed to allocate memory for extra kernel cmdline.\n"); return NULL; } ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); if (ret < 0 || ret > len) { pr_err("Failed to print extra kernel cmdline.\n"); memblock_free(new_cmdline, len + 1); return NULL; } return new_cmdline;} static int __init warn_bootconfig(char *str){ /* The 'bootconfig' option is handled by setup_boot_config(). */ return 0;} static void __init setup_boot_config(void){ const char *msg, *data; int pos, ret, offs; size_t size; bool from_embedded = false; /* Cut out the bootconfig data even if we have no bootconfig option */ data = get_boot_config_from_initrd(&size); /* If there is no bootconfig in initrd, try embedded one. */ if (!data) { data = xbc_get_embedded_bootconfig(&size); from_embedded = true; } bootconfig_found = bootconfig_cmdline_requested(boot_command_line, &offs); if (!(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) return; /* Offset of the init arguments after a "--", located by the helper. */ initargs_offs = offs; if (!data) { /* If user intended to use bootconfig, show an error level message */ if (bootconfig_found) pr_err("'bootconfig' found on command line, but no bootconfig found\n"); else pr_info("No bootconfig data provided, so skipping bootconfig"); return; } if (size >= XBC_DATA_MAX) { pr_err("bootconfig size %ld greater than max size %d\n", (long)size, XBC_DATA_MAX); return; } ret = xbc_init(data, size, &msg, &pos); if (ret < 0) { if (pos < 0) pr_err("Failed to init bootconfig: %s.\n", msg); else pr_err("Failed to parse bootconfig: %s at %d.\n", msg, pos); } else { xbc_get_info(&ret, NULL); pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); /* * keys starting with "kernel." are passed via cmdline. When * this bootconfig came from the embedded source and * setup_arch() already prepended the rendered "kernel" subtree * to boot_command_line, rendering again here would duplicate * the keys in saved_command_line and make accumulating handlers * (console=, earlycon=, ...) re-register the same value. Skip * only when the prepend really happened. * * On arches that do not select ARCH_SUPPORTS_CMDLINE_FROM_BOOTCONFIG, * CONFIG_CMDLINE_FROM_BOOTCONFIG is unselectable and * xbc_embedded_cmdline_applied() collapses to a stub returning * false, so this path still runs and the embedded "kernel" * keys reach the cmdline via the runtime parser exactly as * before this series. */ if (!from_embedded || !xbc_embedded_cmdline_applied()) extra_command_line = xbc_make_cmdline("kernel"); /* Also, "init." keys are init arguments */ extra_init_args = xbc_make_cmdline("init"); } return;} static void __init exit_boot_config(void){ xbc_exit();} #else /* !CONFIG_BOOT_CONFIG */ static void __init setup_boot_config(void){ /* Remove bootconfig data from initrd */ get_boot_config_from_initrd(NULL);} static int __init warn_bootconfig(char *str){ pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); return 0;} #define exit_boot_config() do {} while (0) #endif /* CONFIG_BOOT_CONFIG */ early_param("bootconfig", warn_bootconfig); bool __init cmdline_has_extra_options(void){ return extra_command_line || extra_init_args;} /* Change NUL term back to "=", to make "param" the whole string. */static void __init repair_env_string(char *param, char *val){ if (val) { /* param=val or param="val"? */ if (val == param+strlen(param)+1) val[-1] = '='; else if (val == param+strlen(param)+2) { val[-2] = '='; memmove(val-1, val, strlen(val)+1); } else BUG(); }} /* Anything after -- gets handed straight to init. */static int __init set_init_arg(char *param, char *val, const char *unused, void *arg){ unsigned int i; if (panic_later) return 0; repair_env_string(param, val); for (i = 0; argv_init[i]; i++) { if (i == MAX_INIT_ARGS) { panic_later = "init"; panic_param = param; return 0; } } argv_init[i] = param;Lines 1–500 of 1701. 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// SPDX-License-Identifier: GPL-2.0-only /* * linux/init/main.c * * Copyright (C) 1991, 1992 Linus Torvalds * * GK 2/5/95 - Changed to support mounting root fs via NFS * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 * Simplified starting of init: Michael A. Griffith <grif@acm.org> */ #define DEBUG /* Enable initcall_debug */ #include <linux/types.h> #include <linux/export.h> #include <linux/extable.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/binfmts.h> #include <linux/kernel.h> #include <linux/syscalls.h> #include <linux/stackprotector.h> #include <linux/string.h> #include <linux/ctype.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/initrd.h> #include <linux/memblock.h> #include <linux/acpi.h> #include <linux/bootconfig.h> #include <linux/console.h> #include <linux/nmi.h> #include <linux/percpu.h> #include <linux/kmod.h> #include <linux/kprobes.h> #include <linux/kmsan.h> #include <linux/ksysfs.h> #include <linux/vmalloc.h> #include <linux/kernel_stat.h> #include <linux/start_kernel.h> #include <linux/security.h> #include <linux/smp.h> #include <linux/profile.h> #include <linux/kfence.h> #include <linux/rcupdate.h> #include <linux/srcu.h> #include <linux/moduleparam.h> #include <linux/kallsyms.h> #include <linux/buildid.h> #include <linux/writeback.h> #include <linux/cpu.h> #include <linux/cpuset.h> #include <linux/memcontrol.h> #include <linux/cgroup.h> #include <linux/tick.h> #include <linux/sched/isolation.h> #include <linux/interrupt.h> #include <linux/taskstats_kern.h> #include <linux/delayacct.h> #include <linux/unistd.h> #include <linux/utsname.h> #include <linux/rmap.h> #include <linux/mempolicy.h> #include <linux/key.h> #include <linux/debug_locks.h> #include <linux/debugobjects.h> #include <linux/lockdep.h> #include <linux/kmemleak.h> #include <linux/padata.h> #include <linux/pid_namespace.h> #include <linux/device/driver.h> #include <linux/kthread.h> #include <linux/sched.h> #include <linux/sched/init.h> #include <linux/signal.h> #include <linux/idr.h> #include <linux/kgdb.h> #include <linux/ftrace.h> #include <linux/async.h> #include <linux/shmem_fs.h> #include <linux/slab.h> #include <linux/perf_event.h> #include <linux/ptrace.h> #include <linux/pti.h> #include <linux/blkdev.h> #include <linux/sched/clock.h> #include <linux/sched/task.h> #include <linux/sched/task_stack.h> #include <linux/context_tracking.h> #include <linux/random.h> #include <linux/moduleloader.h> #include <linux/list.h> #include <linux/integrity.h> #include <linux/proc_ns.h> #include <linux/io.h> #include <linux/cache.h> #include <linux/rodata_test.h> #include <linux/jump_label.h> #include <linux/kcsan.h> #include <linux/init_syscalls.h> #include <linux/stackdepot.h> #include <linux/randomize_kstack.h> #include <linux/pidfs.h> #include <linux/fs_struct.h> #include <linux/ptdump.h> #include <linux/time_namespace.h> #include <linux/unaligned.h> #include <linux/vdso_datastore.h> #include <net/net_namespace.h> #include <asm/io.h> #include <asm/setup.h> #include <asm/sections.h> #include <asm/cacheflush.h> #define CREATE_TRACE_POINTS #include <trace/events/initcall.h> #include <kunit/test.h> static int kernel_init(void *); /* * Debug helper: via this flag we know that we are in 'early bootup code' * where only the boot processor is running with IRQ disabled. This means * two things - IRQ must not be enabled before the flag is cleared and some * operations which are not allowed with IRQ disabled are allowed while the * flag is set. */ bool early_boot_irqs_disabled __read_mostly; enum system_states system_state __read_mostly; EXPORT_SYMBOL(system_state); /* * Boot command-line arguments */ #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT /* Default late time init is NULL. archs can override this later. */ void (*__initdata late_time_init)(void); /* Untouched command line saved by arch-specific code. */ char __initdata boot_command_line[COMMAND_LINE_SIZE]; /* Untouched saved command line (eg. for /proc) */ char *saved_command_line __ro_after_init; unsigned int saved_command_line_len __ro_after_init; /* Command line for parameter parsing */ static char *static_command_line; /* Untouched extra command line */ static char *extra_command_line; /* Extra init arguments */ static char *extra_init_args; #ifdef CONFIG_BOOT_CONFIG /* Is bootconfig on command line? */ static bool bootconfig_found; static size_t initargs_offs; #else # define bootconfig_found false # define initargs_offs 0 #endif static char *execute_command; static char *ramdisk_execute_command = "/init"; static bool __initdata ramdisk_execute_command_set; /* * Used to generate warnings if static_key manipulation functions are used * before jump_label_init is called. */ bool static_key_initialized __read_mostly; EXPORT_SYMBOL_GPL(static_key_initialized); /* * If set, this is an indication to the drivers that reset the underlying * device before going ahead with the initialization otherwise driver might * rely on the BIOS and skip the reset operation. * * This is useful if kernel is booting in an unreliable environment. * For ex. kdump situation where previous kernel has crashed, BIOS has been * skipped and devices will be in unknown state. */ unsigned int reset_devices; EXPORT_SYMBOL(reset_devices); static int __init set_reset_devices(char *str) { reset_devices = 1; return 1; } __setup("reset_devices", set_reset_devices); static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; static const char *panic_later, *panic_param; static bool __init obsolete_checksetup(char *line) { const struct obs_kernel_param *p; bool had_early_param = false; p = __setup_start; do { int n = strlen(p->str); if (parameqn(line, p->str, n)) { if (p->early) { /* Already done in parse_early_param? * (Needs exact match on param part). * Keep iterating, as we can have early * params and __setups of same names 8( */ if (line[n] == '\0' || line[n] == '=') had_early_param = true; } else if (!p->setup_func) { pr_warn("Parameter %s is obsolete, ignored\n", p->str); return true; } else if (p->setup_func(line + n)) return true; } p++; } while (p < __setup_end); return had_early_param; } /* * This should be approx 2 Bo*oMips to start (note initial shift), and will * still work even if initially too large, it will just take slightly longer */ unsigned long loops_per_jiffy = (1<<12); EXPORT_SYMBOL(loops_per_jiffy); static int __init debug_kernel(char *str) { console_loglevel = CONSOLE_LOGLEVEL_DEBUG; return 0; } static int __init quiet_kernel(char *str) { console_loglevel = CONSOLE_LOGLEVEL_QUIET; return 0; } early_param("debug", debug_kernel); early_param("quiet", quiet_kernel); static int __init loglevel(char *str) { int newlevel; /* * Only update loglevel value when a correct setting was passed, * to prevent blind crashes (when loglevel being set to 0) that * are quite hard to debug */ if (get_option(&str, &newlevel)) { console_loglevel = newlevel; return 0; } return -EINVAL; } early_param("loglevel", loglevel); #ifdef CONFIG_BLK_DEV_INITRD static void * __init get_boot_config_from_initrd(size_t *_size) { u32 size, csum; char *data; u8 *hdr; int i; if (!initrd_end) return NULL; data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; /* * Since Grub may align the size of initrd to 4, we must * check the preceding 3 bytes as well. */ for (i = 0; i < 4; i++) { if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) goto found; data--; } return NULL; found: hdr = (u8 *)(data - 8); size = get_unaligned_le32(hdr); csum = get_unaligned_le32(hdr + 4); data = ((void *)hdr) - size; if ((unsigned long)data < initrd_start) { pr_err("bootconfig size %d is greater than initrd size %ld\n", size, initrd_end - initrd_start); return NULL; } if (xbc_calc_checksum(data, size) != csum) { pr_err("bootconfig checksum failed\n"); return NULL; } /* Remove bootconfig from initramfs/initrd */ initrd_end = (unsigned long)data; if (_size) *_size = size; return data; } #else static void * __init get_boot_config_from_initrd(size_t *_size) { return NULL; } #endif #ifdef CONFIG_BOOT_CONFIG /* Make an extra command line under given key word */ static char * __init xbc_make_cmdline(const char *key) { struct xbc_node *root; char *new_cmdline; int ret, len = 0; root = xbc_find_node(key); if (!root) return NULL; /* Count required buffer size */ len = xbc_snprint_cmdline(NULL, 0, root); if (len <= 0) return NULL; new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); if (!new_cmdline) { pr_err("Failed to allocate memory for extra kernel cmdline.\n"); return NULL; } ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); if (ret < 0 || ret > len) { pr_err("Failed to print extra kernel cmdline.\n"); memblock_free(new_cmdline, len + 1); return NULL; } return new_cmdline; } static int __init warn_bootconfig(char *str) { /* The 'bootconfig' option is handled by setup_boot_config(). */ return 0; } static void __init setup_boot_config(void) { const char *msg, *data; int pos, ret, offs; size_t size; bool from_embedded = false; /* Cut out the bootconfig data even if we have no bootconfig option */ data = get_boot_config_from_initrd(&size); /* If there is no bootconfig in initrd, try embedded one. */ if (!data) { data = xbc_get_embedded_bootconfig(&size); from_embedded = true; } bootconfig_found = bootconfig_cmdline_requested(boot_command_line, &offs); if (!(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) return; /* Offset of the init arguments after a "--", located by the helper. */ initargs_offs = offs; if (!data) { /* If user intended to use bootconfig, show an error level message */ if (bootconfig_found) pr_err("'bootconfig' found on command line, but no bootconfig found\n"); else pr_info("No bootconfig data provided, so skipping bootconfig"); return; } if (size >= XBC_DATA_MAX) { pr_err("bootconfig size %ld greater than max size %d\n", (long)size, XBC_DATA_MAX); return; } ret = xbc_init(data, size, &msg, &pos); if (ret < 0) { if (pos < 0) pr_err("Failed to init bootconfig: %s.\n", msg); else pr_err("Failed to parse bootconfig: %s at %d.\n", msg, pos); } else { xbc_get_info(&ret, NULL); pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); /* * keys starting with "kernel." are passed via cmdline. When * this bootconfig came from the embedded source and * setup_arch() already prepended the rendered "kernel" subtree * to boot_command_line, rendering again here would duplicate * the keys in saved_command_line and make accumulating handlers * (console=, earlycon=, ...) re-register the same value. Skip * only when the prepend really happened. * * On arches that do not select ARCH_SUPPORTS_CMDLINE_FROM_BOOTCONFIG, * CONFIG_CMDLINE_FROM_BOOTCONFIG is unselectable and * xbc_embedded_cmdline_applied() collapses to a stub returning * false, so this path still runs and the embedded "kernel" * keys reach the cmdline via the runtime parser exactly as * before this series. */ if (!from_embedded || !xbc_embedded_cmdline_applied()) extra_command_line = xbc_make_cmdline("kernel"); /* Also, "init." keys are init arguments */ extra_init_args = xbc_make_cmdline("init"); } return; } static void __init exit_boot_config(void) { xbc_exit(); } #else /* !CONFIG_BOOT_CONFIG */ static void __init setup_boot_config(void) { /* Remove bootconfig data from initrd */ get_boot_config_from_initrd(NULL); } static int __init warn_bootconfig(char *str) { pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); return 0; } #define exit_boot_config() do {} while (0) #endif /* CONFIG_BOOT_CONFIG */ early_param("bootconfig", warn_bootconfig); bool __init cmdline_has_extra_options(void) { return extra_command_line || extra_init_args; } /* Change NUL term back to "=", to make "param" the whole string. */ static void __init repair_env_string(char *param, char *val) { if (val) { /* param=val or param="val"? */ if (val == param+strlen(param)+1) val[-1] = '='; else if (val == param+strlen(param)+2) { val[-2] = '='; memmove(val-1, val, strlen(val)+1); } else BUG(); } } /* Anything after -- gets handed straight to init. */ static int __init set_init_arg(char *param, char *val, const char *unused, void *arg) { unsigned int i; if (panic_later) return 0; repair_env_string(param, val); for (i = 0; argv_init[i]; i++) { if (i == MAX_INIT_ARGS) { panic_later = "init"; panic_param = param; return 0; } } argv_init[i] = param;