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1619 lines
39 KiB
1619 lines
39 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/init/main.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* |
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* GK 2/5/95 - Changed to support mounting root fs via NFS |
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* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 |
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* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 |
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* Simplified starting of init: Michael A. Griffith <[email protected]> |
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*/ |
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|
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#define DEBUG /* Enable initcall_debug */ |
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|
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#include <linux/types.h> |
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#include <linux/extable.h> |
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#include <linux/module.h> |
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#include <linux/proc_fs.h> |
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#include <linux/binfmts.h> |
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#include <linux/kernel.h> |
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#include <linux/syscalls.h> |
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#include <linux/stackprotector.h> |
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#include <linux/string.h> |
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#include <linux/ctype.h> |
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#include <linux/delay.h> |
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#include <linux/ioport.h> |
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#include <linux/init.h> |
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#include <linux/initrd.h> |
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#include <linux/memblock.h> |
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#include <linux/acpi.h> |
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#include <linux/bootconfig.h> |
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#include <linux/console.h> |
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#include <linux/nmi.h> |
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#include <linux/percpu.h> |
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#include <linux/kmod.h> |
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#include <linux/kprobes.h> |
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#include <linux/vmalloc.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/start_kernel.h> |
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#include <linux/security.h> |
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#include <linux/smp.h> |
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#include <linux/profile.h> |
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#include <linux/kfence.h> |
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#include <linux/rcupdate.h> |
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#include <linux/srcu.h> |
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#include <linux/moduleparam.h> |
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#include <linux/kallsyms.h> |
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#include <linux/buildid.h> |
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#include <linux/writeback.h> |
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#include <linux/cpu.h> |
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#include <linux/cpuset.h> |
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#include <linux/cgroup.h> |
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#include <linux/efi.h> |
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#include <linux/tick.h> |
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#include <linux/sched/isolation.h> |
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#include <linux/interrupt.h> |
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#include <linux/taskstats_kern.h> |
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#include <linux/delayacct.h> |
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#include <linux/unistd.h> |
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#include <linux/utsname.h> |
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#include <linux/rmap.h> |
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#include <linux/mempolicy.h> |
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#include <linux/key.h> |
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#include <linux/page_ext.h> |
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#include <linux/debug_locks.h> |
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#include <linux/debugobjects.h> |
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#include <linux/lockdep.h> |
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#include <linux/kmemleak.h> |
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#include <linux/padata.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/device/driver.h> |
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#include <linux/kthread.h> |
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#include <linux/sched.h> |
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#include <linux/sched/init.h> |
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#include <linux/signal.h> |
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#include <linux/idr.h> |
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#include <linux/kgdb.h> |
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#include <linux/ftrace.h> |
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#include <linux/async.h> |
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#include <linux/shmem_fs.h> |
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#include <linux/slab.h> |
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#include <linux/perf_event.h> |
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#include <linux/ptrace.h> |
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#include <linux/pti.h> |
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#include <linux/blkdev.h> |
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#include <linux/elevator.h> |
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#include <linux/sched/clock.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/context_tracking.h> |
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#include <linux/random.h> |
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#include <linux/list.h> |
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#include <linux/integrity.h> |
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#include <linux/proc_ns.h> |
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#include <linux/io.h> |
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#include <linux/cache.h> |
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#include <linux/rodata_test.h> |
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#include <linux/jump_label.h> |
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#include <linux/mem_encrypt.h> |
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#include <linux/kcsan.h> |
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#include <linux/init_syscalls.h> |
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#include <linux/stackdepot.h> |
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|
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#include <asm/io.h> |
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#include <asm/bugs.h> |
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#include <asm/setup.h> |
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#include <asm/sections.h> |
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#include <asm/cacheflush.h> |
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|
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#define CREATE_TRACE_POINTS |
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#include <trace/events/initcall.h> |
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|
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#include <kunit/test.h> |
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|
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static int kernel_init(void *); |
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|
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extern void init_IRQ(void); |
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extern void radix_tree_init(void); |
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|
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/* |
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* Debug helper: via this flag we know that we are in 'early bootup code' |
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* where only the boot processor is running with IRQ disabled. This means |
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* two things - IRQ must not be enabled before the flag is cleared and some |
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* operations which are not allowed with IRQ disabled are allowed while the |
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* flag is set. |
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*/ |
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bool early_boot_irqs_disabled __read_mostly; |
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|
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enum system_states system_state __read_mostly; |
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EXPORT_SYMBOL(system_state); |
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|
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/* |
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* Boot command-line arguments |
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*/ |
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#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
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#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
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|
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extern void time_init(void); |
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/* Default late time init is NULL. archs can override this later. */ |
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void (*__initdata late_time_init)(void); |
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|
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/* Untouched command line saved by arch-specific code. */ |
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char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
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/* Untouched saved command line (eg. for /proc) */ |
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char *saved_command_line; |
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/* Command line for parameter parsing */ |
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static char *static_command_line; |
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/* Untouched extra command line */ |
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static char *extra_command_line; |
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/* Extra init arguments */ |
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static char *extra_init_args; |
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|
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#ifdef CONFIG_BOOT_CONFIG |
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/* Is bootconfig on command line? */ |
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static bool bootconfig_found; |
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static bool initargs_found; |
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#else |
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# define bootconfig_found false |
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# define initargs_found false |
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#endif |
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static char *execute_command; |
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static char *ramdisk_execute_command = "/init"; |
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|
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/* |
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* Used to generate warnings if static_key manipulation functions are used |
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* before jump_label_init is called. |
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*/ |
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bool static_key_initialized __read_mostly; |
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EXPORT_SYMBOL_GPL(static_key_initialized); |
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|
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/* |
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* If set, this is an indication to the drivers that reset the underlying |
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* device before going ahead with the initialization otherwise driver might |
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* rely on the BIOS and skip the reset operation. |
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* |
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* This is useful if kernel is booting in an unreliable environment. |
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* For ex. kdump situation where previous kernel has crashed, BIOS has been |
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* skipped and devices will be in unknown state. |
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*/ |
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unsigned int reset_devices; |
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EXPORT_SYMBOL(reset_devices); |
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|
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static int __init set_reset_devices(char *str) |
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{ |
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reset_devices = 1; |
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return 1; |
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} |
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__setup("reset_devices", set_reset_devices); |
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static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
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const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
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static const char *panic_later, *panic_param; |
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|
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extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
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|
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static bool __init obsolete_checksetup(char *line) |
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{ |
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const struct obs_kernel_param *p; |
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bool had_early_param = false; |
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|
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p = __setup_start; |
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do { |
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int n = strlen(p->str); |
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if (parameqn(line, p->str, n)) { |
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if (p->early) { |
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/* Already done in parse_early_param? |
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* (Needs exact match on param part). |
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* Keep iterating, as we can have early |
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* params and __setups of same names 8( */ |
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if (line[n] == '\0' || line[n] == '=') |
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had_early_param = true; |
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} else if (!p->setup_func) { |
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pr_warn("Parameter %s is obsolete, ignored\n", |
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p->str); |
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return true; |
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} else if (p->setup_func(line + n)) |
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return true; |
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} |
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p++; |
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} while (p < __setup_end); |
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return had_early_param; |
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} |
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/* |
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* This should be approx 2 Bo*oMips to start (note initial shift), and will |
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* still work even if initially too large, it will just take slightly longer |
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*/ |
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unsigned long loops_per_jiffy = (1<<12); |
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EXPORT_SYMBOL(loops_per_jiffy); |
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static int __init debug_kernel(char *str) |
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{ |
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console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
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return 0; |
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} |
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static int __init quiet_kernel(char *str) |
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{ |
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console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
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return 0; |
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} |
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early_param("debug", debug_kernel); |
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early_param("quiet", quiet_kernel); |
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static int __init loglevel(char *str) |
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{ |
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int newlevel; |
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/* |
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* Only update loglevel value when a correct setting was passed, |
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* to prevent blind crashes (when loglevel being set to 0) that |
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* are quite hard to debug |
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*/ |
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if (get_option(&str, &newlevel)) { |
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console_loglevel = newlevel; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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early_param("loglevel", loglevel); |
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#ifdef CONFIG_BLK_DEV_INITRD |
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static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) |
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{ |
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u32 size, csum; |
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char *data; |
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u32 *hdr; |
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int i; |
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if (!initrd_end) |
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return NULL; |
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data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; |
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/* |
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* Since Grub may align the size of initrd to 4, we must |
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* check the preceding 3 bytes as well. |
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*/ |
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for (i = 0; i < 4; i++) { |
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if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) |
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goto found; |
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data--; |
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} |
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return NULL; |
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found: |
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hdr = (u32 *)(data - 8); |
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size = le32_to_cpu(hdr[0]); |
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csum = le32_to_cpu(hdr[1]); |
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data = ((void *)hdr) - size; |
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if ((unsigned long)data < initrd_start) { |
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pr_err("bootconfig size %d is greater than initrd size %ld\n", |
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size, initrd_end - initrd_start); |
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return NULL; |
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} |
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/* Remove bootconfig from initramfs/initrd */ |
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initrd_end = (unsigned long)data; |
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if (_size) |
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*_size = size; |
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if (_csum) |
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*_csum = csum; |
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return data; |
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} |
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#else |
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static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) |
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{ |
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return NULL; |
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} |
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#endif |
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#ifdef CONFIG_BOOT_CONFIG |
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static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; |
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#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) |
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static int __init xbc_snprint_cmdline(char *buf, size_t size, |
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struct xbc_node *root) |
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{ |
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struct xbc_node *knode, *vnode; |
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char *end = buf + size; |
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const char *val; |
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int ret; |
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xbc_node_for_each_key_value(root, knode, val) { |
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ret = xbc_node_compose_key_after(root, knode, |
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xbc_namebuf, XBC_KEYLEN_MAX); |
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if (ret < 0) |
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return ret; |
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vnode = xbc_node_get_child(knode); |
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if (!vnode) { |
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ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); |
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if (ret < 0) |
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return ret; |
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buf += ret; |
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continue; |
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} |
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xbc_array_for_each_value(vnode, val) { |
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ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", |
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xbc_namebuf, val); |
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if (ret < 0) |
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return ret; |
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buf += ret; |
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} |
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} |
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|
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return buf - (end - size); |
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} |
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#undef rest |
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|
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/* Make an extra command line under given key word */ |
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static char * __init xbc_make_cmdline(const char *key) |
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{ |
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struct xbc_node *root; |
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char *new_cmdline; |
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int ret, len = 0; |
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root = xbc_find_node(key); |
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if (!root) |
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return NULL; |
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|
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/* Count required buffer size */ |
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len = xbc_snprint_cmdline(NULL, 0, root); |
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if (len <= 0) |
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return NULL; |
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new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); |
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if (!new_cmdline) { |
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pr_err("Failed to allocate memory for extra kernel cmdline.\n"); |
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return NULL; |
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} |
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ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); |
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if (ret < 0 || ret > len) { |
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pr_err("Failed to print extra kernel cmdline.\n"); |
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return NULL; |
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} |
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|
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return new_cmdline; |
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} |
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|
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static int __init bootconfig_params(char *param, char *val, |
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const char *unused, void *arg) |
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{ |
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if (strcmp(param, "bootconfig") == 0) { |
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bootconfig_found = true; |
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} |
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return 0; |
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} |
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|
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static void __init setup_boot_config(void) |
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{ |
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static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
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const char *msg; |
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int pos; |
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u32 size, csum; |
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char *data, *copy, *err; |
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int ret; |
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|
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/* Cut out the bootconfig data even if we have no bootconfig option */ |
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data = get_boot_config_from_initrd(&size, &csum); |
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strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
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err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, |
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bootconfig_params); |
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if (IS_ERR(err) || !bootconfig_found) |
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return; |
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|
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/* parse_args() stops at '--' and returns an address */ |
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if (err) |
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initargs_found = true; |
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|
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if (!data) { |
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pr_err("'bootconfig' found on command line, but no bootconfig found\n"); |
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return; |
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} |
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|
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if (size >= XBC_DATA_MAX) { |
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pr_err("bootconfig size %d greater than max size %d\n", |
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size, XBC_DATA_MAX); |
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return; |
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} |
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|
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if (xbc_calc_checksum(data, size) != csum) { |
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pr_err("bootconfig checksum failed\n"); |
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return; |
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} |
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|
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copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); |
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if (!copy) { |
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pr_err("Failed to allocate memory for bootconfig\n"); |
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return; |
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} |
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|
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memcpy(copy, data, size); |
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copy[size] = '\0'; |
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|
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ret = xbc_init(copy, &msg, &pos); |
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if (ret < 0) { |
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if (pos < 0) |
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pr_err("Failed to init bootconfig: %s.\n", msg); |
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else |
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pr_err("Failed to parse bootconfig: %s at %d.\n", |
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msg, pos); |
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} else { |
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pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); |
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/* keys starting with "kernel." are passed via cmdline */ |
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extra_command_line = xbc_make_cmdline("kernel"); |
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/* Also, "init." keys are init arguments */ |
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extra_init_args = xbc_make_cmdline("init"); |
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} |
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return; |
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} |
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#else |
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static void __init setup_boot_config(void) |
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{ |
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/* Remove bootconfig data from initrd */ |
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get_boot_config_from_initrd(NULL, NULL); |
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} |
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|
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static int __init warn_bootconfig(char *str) |
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{ |
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pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); |
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return 0; |
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} |
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early_param("bootconfig", warn_bootconfig); |
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|
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#endif |
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|
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/* Change NUL term back to "=", to make "param" the whole string. */ |
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static void __init repair_env_string(char *param, char *val) |
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{ |
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if (val) { |
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/* param=val or param="val"? */ |
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if (val == param+strlen(param)+1) |
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val[-1] = '='; |
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else if (val == param+strlen(param)+2) { |
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val[-2] = '='; |
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memmove(val-1, val, strlen(val)+1); |
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} else |
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BUG(); |
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} |
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} |
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|
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/* Anything after -- gets handed straight to init. */ |
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static int __init set_init_arg(char *param, char *val, |
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const char *unused, void *arg) |
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{ |
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unsigned int i; |
|
|
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if (panic_later) |
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return 0; |
|
|
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repair_env_string(param, val); |
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|
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for (i = 0; argv_init[i]; i++) { |
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if (i == MAX_INIT_ARGS) { |
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panic_later = "init"; |
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panic_param = param; |
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return 0; |
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} |
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} |
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argv_init[i] = param; |
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return 0; |
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} |
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|
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/* |
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* Unknown boot options get handed to init, unless they look like |
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* unused parameters (modprobe will find them in /proc/cmdline). |
|
*/ |
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static int __init unknown_bootoption(char *param, char *val, |
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const char *unused, void *arg) |
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{ |
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size_t len = strlen(param); |
|
|
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repair_env_string(param, val); |
|
|
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/* Handle obsolete-style parameters */ |
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if (obsolete_checksetup(param)) |
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return 0; |
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|
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/* Unused module parameter. */ |
|
if (strnchr(param, len, '.')) |
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return 0; |
|
|
|
if (panic_later) |
|
return 0; |
|
|
|
if (val) { |
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/* Environment option */ |
|
unsigned int i; |
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for (i = 0; envp_init[i]; i++) { |
|
if (i == MAX_INIT_ENVS) { |
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panic_later = "env"; |
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panic_param = param; |
|
} |
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if (!strncmp(param, envp_init[i], len+1)) |
|
break; |
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} |
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envp_init[i] = param; |
|
} else { |
|
/* Command line option */ |
|
unsigned int i; |
|
for (i = 0; argv_init[i]; i++) { |
|
if (i == MAX_INIT_ARGS) { |
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panic_later = "init"; |
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panic_param = param; |
|
} |
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} |
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argv_init[i] = param; |
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} |
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return 0; |
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} |
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|
|
static int __init init_setup(char *str) |
|
{ |
|
unsigned int i; |
|
|
|
execute_command = str; |
|
/* |
|
* In case LILO is going to boot us with default command line, |
|
* it prepends "auto" before the whole cmdline which makes |
|
* the shell think it should execute a script with such name. |
|
* So we ignore all arguments entered _before_ init=... [MJ] |
|
*/ |
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for (i = 1; i < MAX_INIT_ARGS; i++) |
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argv_init[i] = NULL; |
|
return 1; |
|
} |
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__setup("init=", init_setup); |
|
|
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static int __init rdinit_setup(char *str) |
|
{ |
|
unsigned int i; |
|
|
|
ramdisk_execute_command = str; |
|
/* See "auto" comment in init_setup */ |
|
for (i = 1; i < MAX_INIT_ARGS; i++) |
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argv_init[i] = NULL; |
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return 1; |
|
} |
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__setup("rdinit=", rdinit_setup); |
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|
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#ifndef CONFIG_SMP |
|
static const unsigned int setup_max_cpus = NR_CPUS; |
|
static inline void setup_nr_cpu_ids(void) { } |
|
static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
|
#endif |
|
|
|
/* |
|
* We need to store the untouched command line for future reference. |
|
* We also need to store the touched command line since the parameter |
|
* parsing is performed in place, and we should allow a component to |
|
* store reference of name/value for future reference. |
|
*/ |
|
static void __init setup_command_line(char *command_line) |
|
{ |
|
size_t len, xlen = 0, ilen = 0; |
|
|
|
if (extra_command_line) |
|
xlen = strlen(extra_command_line); |
|
if (extra_init_args) |
|
ilen = strlen(extra_init_args) + 4; /* for " -- " */ |
|
|
|
len = xlen + strlen(boot_command_line) + 1; |
|
|
|
saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); |
|
if (!saved_command_line) |
|
panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); |
|
|
|
static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); |
|
if (!static_command_line) |
|
panic("%s: Failed to allocate %zu bytes\n", __func__, len); |
|
|
|
if (xlen) { |
|
/* |
|
* We have to put extra_command_line before boot command |
|
* lines because there could be dashes (separator of init |
|
* command line) in the command lines. |
|
*/ |
|
strcpy(saved_command_line, extra_command_line); |
|
strcpy(static_command_line, extra_command_line); |
|
} |
|
strcpy(saved_command_line + xlen, boot_command_line); |
|
strcpy(static_command_line + xlen, command_line); |
|
|
|
if (ilen) { |
|
/* |
|
* Append supplemental init boot args to saved_command_line |
|
* so that user can check what command line options passed |
|
* to init. |
|
*/ |
|
len = strlen(saved_command_line); |
|
if (initargs_found) { |
|
saved_command_line[len++] = ' '; |
|
} else { |
|
strcpy(saved_command_line + len, " -- "); |
|
len += 4; |
|
} |
|
|
|
strcpy(saved_command_line + len, extra_init_args); |
|
} |
|
} |
|
|
|
/* |
|
* We need to finalize in a non-__init function or else race conditions |
|
* between the root thread and the init thread may cause start_kernel to |
|
* be reaped by free_initmem before the root thread has proceeded to |
|
* cpu_idle. |
|
* |
|
* gcc-3.4 accidentally inlines this function, so use noinline. |
|
*/ |
|
|
|
static __initdata DECLARE_COMPLETION(kthreadd_done); |
|
|
|
noinline void __ref rest_init(void) |
|
{ |
|
struct task_struct *tsk; |
|
int pid; |
|
|
|
rcu_scheduler_starting(); |
|
/* |
|
* We need to spawn init first so that it obtains pid 1, however |
|
* the init task will end up wanting to create kthreads, which, if |
|
* we schedule it before we create kthreadd, will OOPS. |
|
*/ |
|
pid = kernel_thread(kernel_init, NULL, CLONE_FS); |
|
/* |
|
* Pin init on the boot CPU. Task migration is not properly working |
|
* until sched_init_smp() has been run. It will set the allowed |
|
* CPUs for init to the non isolated CPUs. |
|
*/ |
|
rcu_read_lock(); |
|
tsk = find_task_by_pid_ns(pid, &init_pid_ns); |
|
tsk->flags |= PF_NO_SETAFFINITY; |
|
set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); |
|
rcu_read_unlock(); |
|
|
|
numa_default_policy(); |
|
pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
|
rcu_read_lock(); |
|
kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
|
rcu_read_unlock(); |
|
|
|
/* |
|
* Enable might_sleep() and smp_processor_id() checks. |
|
* They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
|
* kernel_thread() would trigger might_sleep() splats. With |
|
* CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled |
|
* already, but it's stuck on the kthreadd_done completion. |
|
*/ |
|
system_state = SYSTEM_SCHEDULING; |
|
|
|
complete(&kthreadd_done); |
|
|
|
/* |
|
* The boot idle thread must execute schedule() |
|
* at least once to get things moving: |
|
*/ |
|
schedule_preempt_disabled(); |
|
/* Call into cpu_idle with preempt disabled */ |
|
cpu_startup_entry(CPUHP_ONLINE); |
|
} |
|
|
|
/* Check for early params. */ |
|
static int __init do_early_param(char *param, char *val, |
|
const char *unused, void *arg) |
|
{ |
|
const struct obs_kernel_param *p; |
|
|
|
for (p = __setup_start; p < __setup_end; p++) { |
|
if ((p->early && parameq(param, p->str)) || |
|
(strcmp(param, "console") == 0 && |
|
strcmp(p->str, "earlycon") == 0) |
|
) { |
|
if (p->setup_func(val) != 0) |
|
pr_warn("Malformed early option '%s'\n", param); |
|
} |
|
} |
|
/* We accept everything at this stage. */ |
|
return 0; |
|
} |
|
|
|
void __init parse_early_options(char *cmdline) |
|
{ |
|
parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
|
do_early_param); |
|
} |
|
|
|
/* Arch code calls this early on, or if not, just before other parsing. */ |
|
void __init parse_early_param(void) |
|
{ |
|
static int done __initdata; |
|
static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
|
|
|
if (done) |
|
return; |
|
|
|
/* All fall through to do_early_param. */ |
|
strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
|
parse_early_options(tmp_cmdline); |
|
done = 1; |
|
} |
|
|
|
void __init __weak arch_post_acpi_subsys_init(void) { } |
|
|
|
void __init __weak smp_setup_processor_id(void) |
|
{ |
|
} |
|
|
|
# if THREAD_SIZE >= PAGE_SIZE |
|
void __init __weak thread_stack_cache_init(void) |
|
{ |
|
} |
|
#endif |
|
|
|
void __init __weak mem_encrypt_init(void) { } |
|
|
|
void __init __weak poking_init(void) { } |
|
|
|
void __init __weak pgtable_cache_init(void) { } |
|
|
|
bool initcall_debug; |
|
core_param(initcall_debug, initcall_debug, bool, 0644); |
|
|
|
#ifdef TRACEPOINTS_ENABLED |
|
static void __init initcall_debug_enable(void); |
|
#else |
|
static inline void initcall_debug_enable(void) |
|
{ |
|
} |
|
#endif |
|
|
|
/* Report memory auto-initialization states for this boot. */ |
|
static void __init report_meminit(void) |
|
{ |
|
const char *stack; |
|
|
|
if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) |
|
stack = "all(pattern)"; |
|
else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) |
|
stack = "all(zero)"; |
|
else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) |
|
stack = "byref_all(zero)"; |
|
else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) |
|
stack = "byref(zero)"; |
|
else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) |
|
stack = "__user(zero)"; |
|
else |
|
stack = "off"; |
|
|
|
pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", |
|
stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", |
|
want_init_on_free() ? "on" : "off"); |
|
if (want_init_on_free()) |
|
pr_info("mem auto-init: clearing system memory may take some time...\n"); |
|
} |
|
|
|
/* |
|
* Set up kernel memory allocators |
|
*/ |
|
static void __init mm_init(void) |
|
{ |
|
/* |
|
* page_ext requires contiguous pages, |
|
* bigger than MAX_ORDER unless SPARSEMEM. |
|
*/ |
|
page_ext_init_flatmem(); |
|
init_mem_debugging_and_hardening(); |
|
kfence_alloc_pool(); |
|
report_meminit(); |
|
stack_depot_init(); |
|
mem_init(); |
|
mem_init_print_info(); |
|
/* page_owner must be initialized after buddy is ready */ |
|
page_ext_init_flatmem_late(); |
|
kmem_cache_init(); |
|
kmemleak_init(); |
|
pgtable_init(); |
|
debug_objects_mem_init(); |
|
vmalloc_init(); |
|
/* Should be run before the first non-init thread is created */ |
|
init_espfix_bsp(); |
|
/* Should be run after espfix64 is set up. */ |
|
pti_init(); |
|
} |
|
|
|
#ifdef CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET |
|
DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, |
|
randomize_kstack_offset); |
|
DEFINE_PER_CPU(u32, kstack_offset); |
|
|
|
static int __init early_randomize_kstack_offset(char *buf) |
|
{ |
|
int ret; |
|
bool bool_result; |
|
|
|
ret = kstrtobool(buf, &bool_result); |
|
if (ret) |
|
return ret; |
|
|
|
if (bool_result) |
|
static_branch_enable(&randomize_kstack_offset); |
|
else |
|
static_branch_disable(&randomize_kstack_offset); |
|
return 0; |
|
} |
|
early_param("randomize_kstack_offset", early_randomize_kstack_offset); |
|
#endif |
|
|
|
void __init __weak arch_call_rest_init(void) |
|
{ |
|
rest_init(); |
|
} |
|
|
|
static void __init print_unknown_bootoptions(void) |
|
{ |
|
char *unknown_options; |
|
char *end; |
|
const char *const *p; |
|
size_t len; |
|
|
|
if (panic_later || (!argv_init[1] && !envp_init[2])) |
|
return; |
|
|
|
/* |
|
* Determine how many options we have to print out, plus a space |
|
* before each |
|
*/ |
|
len = 1; /* null terminator */ |
|
for (p = &argv_init[1]; *p; p++) { |
|
len++; |
|
len += strlen(*p); |
|
} |
|
for (p = &envp_init[2]; *p; p++) { |
|
len++; |
|
len += strlen(*p); |
|
} |
|
|
|
unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); |
|
if (!unknown_options) { |
|
pr_err("%s: Failed to allocate %zu bytes\n", |
|
__func__, len); |
|
return; |
|
} |
|
end = unknown_options; |
|
|
|
for (p = &argv_init[1]; *p; p++) |
|
end += sprintf(end, " %s", *p); |
|
for (p = &envp_init[2]; *p; p++) |
|
end += sprintf(end, " %s", *p); |
|
|
|
pr_notice("Unknown command line parameters:%s\n", unknown_options); |
|
memblock_free(__pa(unknown_options), len); |
|
} |
|
|
|
asmlinkage __visible void __init __no_sanitize_address start_kernel(void) |
|
{ |
|
char *command_line; |
|
char *after_dashes; |
|
|
|
set_task_stack_end_magic(&init_task); |
|
smp_setup_processor_id(); |
|
debug_objects_early_init(); |
|
init_vmlinux_build_id(); |
|
|
|
cgroup_init_early(); |
|
|
|
local_irq_disable(); |
|
early_boot_irqs_disabled = true; |
|
|
|
/* |
|
* Interrupts are still disabled. Do necessary setups, then |
|
* enable them. |
|
*/ |
|
boot_cpu_init(); |
|
page_address_init(); |
|
pr_notice("%s", linux_banner); |
|
early_security_init(); |
|
setup_arch(&command_line); |
|
setup_boot_config(); |
|
setup_command_line(command_line); |
|
setup_nr_cpu_ids(); |
|
setup_per_cpu_areas(); |
|
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
|
boot_cpu_hotplug_init(); |
|
|
|
build_all_zonelists(NULL); |
|
page_alloc_init(); |
|
|
|
pr_notice("Kernel command line: %s\n", saved_command_line); |
|
/* parameters may set static keys */ |
|
jump_label_init(); |
|
parse_early_param(); |
|
after_dashes = parse_args("Booting kernel", |
|
static_command_line, __start___param, |
|
__stop___param - __start___param, |
|
-1, -1, NULL, &unknown_bootoption); |
|
print_unknown_bootoptions(); |
|
if (!IS_ERR_OR_NULL(after_dashes)) |
|
parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
|
NULL, set_init_arg); |
|
if (extra_init_args) |
|
parse_args("Setting extra init args", extra_init_args, |
|
NULL, 0, -1, -1, NULL, set_init_arg); |
|
|
|
/* |
|
* These use large bootmem allocations and must precede |
|
* kmem_cache_init() |
|
*/ |
|
setup_log_buf(0); |
|
vfs_caches_init_early(); |
|
sort_main_extable(); |
|
trap_init(); |
|
mm_init(); |
|
|
|
ftrace_init(); |
|
|
|
/* trace_printk can be enabled here */ |
|
early_trace_init(); |
|
|
|
/* |
|
* Set up the scheduler prior starting any interrupts (such as the |
|
* timer interrupt). Full topology setup happens at smp_init() |
|
* time - but meanwhile we still have a functioning scheduler. |
|
*/ |
|
sched_init(); |
|
|
|
if (WARN(!irqs_disabled(), |
|
"Interrupts were enabled *very* early, fixing it\n")) |
|
local_irq_disable(); |
|
radix_tree_init(); |
|
|
|
/* |
|
* Set up housekeeping before setting up workqueues to allow the unbound |
|
* workqueue to take non-housekeeping into account. |
|
*/ |
|
housekeeping_init(); |
|
|
|
/* |
|
* Allow workqueue creation and work item queueing/cancelling |
|
* early. Work item execution depends on kthreads and starts after |
|
* workqueue_init(). |
|
*/ |
|
workqueue_init_early(); |
|
|
|
rcu_init(); |
|
|
|
/* Trace events are available after this */ |
|
trace_init(); |
|
|
|
if (initcall_debug) |
|
initcall_debug_enable(); |
|
|
|
context_tracking_init(); |
|
/* init some links before init_ISA_irqs() */ |
|
early_irq_init(); |
|
init_IRQ(); |
|
tick_init(); |
|
rcu_init_nohz(); |
|
init_timers(); |
|
srcu_init(); |
|
hrtimers_init(); |
|
softirq_init(); |
|
timekeeping_init(); |
|
kfence_init(); |
|
|
|
/* |
|
* For best initial stack canary entropy, prepare it after: |
|
* - setup_arch() for any UEFI RNG entropy and boot cmdline access |
|
* - timekeeping_init() for ktime entropy used in rand_initialize() |
|
* - rand_initialize() to get any arch-specific entropy like RDRAND |
|
* - add_latent_entropy() to get any latent entropy |
|
* - adding command line entropy |
|
*/ |
|
rand_initialize(); |
|
add_latent_entropy(); |
|
add_device_randomness(command_line, strlen(command_line)); |
|
boot_init_stack_canary(); |
|
|
|
time_init(); |
|
perf_event_init(); |
|
profile_init(); |
|
call_function_init(); |
|
WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
|
|
|
early_boot_irqs_disabled = false; |
|
local_irq_enable(); |
|
|
|
kmem_cache_init_late(); |
|
|
|
/* |
|
* HACK ALERT! This is early. We're enabling the console before |
|
* we've done PCI setups etc, and console_init() must be aware of |
|
* this. But we do want output early, in case something goes wrong. |
|
*/ |
|
console_init(); |
|
if (panic_later) |
|
panic("Too many boot %s vars at `%s'", panic_later, |
|
panic_param); |
|
|
|
lockdep_init(); |
|
|
|
/* |
|
* Need to run this when irqs are enabled, because it wants |
|
* to self-test [hard/soft]-irqs on/off lock inversion bugs |
|
* too: |
|
*/ |
|
locking_selftest(); |
|
|
|
/* |
|
* This needs to be called before any devices perform DMA |
|
* operations that might use the SWIOTLB bounce buffers. It will |
|
* mark the bounce buffers as decrypted so that their usage will |
|
* not cause "plain-text" data to be decrypted when accessed. |
|
*/ |
|
mem_encrypt_init(); |
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD |
|
if (initrd_start && !initrd_below_start_ok && |
|
page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
|
pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
|
page_to_pfn(virt_to_page((void *)initrd_start)), |
|
min_low_pfn); |
|
initrd_start = 0; |
|
} |
|
#endif |
|
setup_per_cpu_pageset(); |
|
numa_policy_init(); |
|
acpi_early_init(); |
|
if (late_time_init) |
|
late_time_init(); |
|
sched_clock_init(); |
|
calibrate_delay(); |
|
pid_idr_init(); |
|
anon_vma_init(); |
|
#ifdef CONFIG_X86 |
|
if (efi_enabled(EFI_RUNTIME_SERVICES)) |
|
efi_enter_virtual_mode(); |
|
#endif |
|
thread_stack_cache_init(); |
|
cred_init(); |
|
fork_init(); |
|
proc_caches_init(); |
|
uts_ns_init(); |
|
key_init(); |
|
security_init(); |
|
dbg_late_init(); |
|
vfs_caches_init(); |
|
pagecache_init(); |
|
signals_init(); |
|
seq_file_init(); |
|
proc_root_init(); |
|
nsfs_init(); |
|
cpuset_init(); |
|
cgroup_init(); |
|
taskstats_init_early(); |
|
delayacct_init(); |
|
|
|
poking_init(); |
|
check_bugs(); |
|
|
|
acpi_subsystem_init(); |
|
arch_post_acpi_subsys_init(); |
|
kcsan_init(); |
|
|
|
/* Do the rest non-__init'ed, we're now alive */ |
|
arch_call_rest_init(); |
|
|
|
prevent_tail_call_optimization(); |
|
} |
|
|
|
/* Call all constructor functions linked into the kernel. */ |
|
static void __init do_ctors(void) |
|
{ |
|
/* |
|
* For UML, the constructors have already been called by the |
|
* normal setup code as it's just a normal ELF binary, so we |
|
* cannot do it again - but we do need CONFIG_CONSTRUCTORS |
|
* even on UML for modules. |
|
*/ |
|
#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) |
|
ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
|
|
|
for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
|
(*fn)(); |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_KALLSYMS |
|
struct blacklist_entry { |
|
struct list_head next; |
|
char *buf; |
|
}; |
|
|
|
static __initdata_or_module LIST_HEAD(blacklisted_initcalls); |
|
|
|
static int __init initcall_blacklist(char *str) |
|
{ |
|
char *str_entry; |
|
struct blacklist_entry *entry; |
|
|
|
/* str argument is a comma-separated list of functions */ |
|
do { |
|
str_entry = strsep(&str, ","); |
|
if (str_entry) { |
|
pr_debug("blacklisting initcall %s\n", str_entry); |
|
entry = memblock_alloc(sizeof(*entry), |
|
SMP_CACHE_BYTES); |
|
if (!entry) |
|
panic("%s: Failed to allocate %zu bytes\n", |
|
__func__, sizeof(*entry)); |
|
entry->buf = memblock_alloc(strlen(str_entry) + 1, |
|
SMP_CACHE_BYTES); |
|
if (!entry->buf) |
|
panic("%s: Failed to allocate %zu bytes\n", |
|
__func__, strlen(str_entry) + 1); |
|
strcpy(entry->buf, str_entry); |
|
list_add(&entry->next, &blacklisted_initcalls); |
|
} |
|
} while (str_entry); |
|
|
|
return 0; |
|
} |
|
|
|
static bool __init_or_module initcall_blacklisted(initcall_t fn) |
|
{ |
|
struct blacklist_entry *entry; |
|
char fn_name[KSYM_SYMBOL_LEN]; |
|
unsigned long addr; |
|
|
|
if (list_empty(&blacklisted_initcalls)) |
|
return false; |
|
|
|
addr = (unsigned long) dereference_function_descriptor(fn); |
|
sprint_symbol_no_offset(fn_name, addr); |
|
|
|
/* |
|
* fn will be "function_name [module_name]" where [module_name] is not |
|
* displayed for built-in init functions. Strip off the [module_name]. |
|
*/ |
|
strreplace(fn_name, ' ', '\0'); |
|
|
|
list_for_each_entry(entry, &blacklisted_initcalls, next) { |
|
if (!strcmp(fn_name, entry->buf)) { |
|
pr_debug("initcall %s blacklisted\n", fn_name); |
|
return true; |
|
} |
|
} |
|
|
|
return false; |
|
} |
|
#else |
|
static int __init initcall_blacklist(char *str) |
|
{ |
|
pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); |
|
return 0; |
|
} |
|
|
|
static bool __init_or_module initcall_blacklisted(initcall_t fn) |
|
{ |
|
return false; |
|
} |
|
#endif |
|
__setup("initcall_blacklist=", initcall_blacklist); |
|
|
|
static __init_or_module void |
|
trace_initcall_start_cb(void *data, initcall_t fn) |
|
{ |
|
ktime_t *calltime = (ktime_t *)data; |
|
|
|
printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
|
*calltime = ktime_get(); |
|
} |
|
|
|
static __init_or_module void |
|
trace_initcall_finish_cb(void *data, initcall_t fn, int ret) |
|
{ |
|
ktime_t *calltime = (ktime_t *)data; |
|
ktime_t delta, rettime; |
|
unsigned long long duration; |
|
|
|
rettime = ktime_get(); |
|
delta = ktime_sub(rettime, *calltime); |
|
duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
|
printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
|
fn, ret, duration); |
|
} |
|
|
|
static ktime_t initcall_calltime; |
|
|
|
#ifdef TRACEPOINTS_ENABLED |
|
static void __init initcall_debug_enable(void) |
|
{ |
|
int ret; |
|
|
|
ret = register_trace_initcall_start(trace_initcall_start_cb, |
|
&initcall_calltime); |
|
ret |= register_trace_initcall_finish(trace_initcall_finish_cb, |
|
&initcall_calltime); |
|
WARN(ret, "Failed to register initcall tracepoints\n"); |
|
} |
|
# define do_trace_initcall_start trace_initcall_start |
|
# define do_trace_initcall_finish trace_initcall_finish |
|
#else |
|
static inline void do_trace_initcall_start(initcall_t fn) |
|
{ |
|
if (!initcall_debug) |
|
return; |
|
trace_initcall_start_cb(&initcall_calltime, fn); |
|
} |
|
static inline void do_trace_initcall_finish(initcall_t fn, int ret) |
|
{ |
|
if (!initcall_debug) |
|
return; |
|
trace_initcall_finish_cb(&initcall_calltime, fn, ret); |
|
} |
|
#endif /* !TRACEPOINTS_ENABLED */ |
|
|
|
int __init_or_module do_one_initcall(initcall_t fn) |
|
{ |
|
int count = preempt_count(); |
|
char msgbuf[64]; |
|
int ret; |
|
|
|
if (initcall_blacklisted(fn)) |
|
return -EPERM; |
|
|
|
do_trace_initcall_start(fn); |
|
ret = fn(); |
|
do_trace_initcall_finish(fn, ret); |
|
|
|
msgbuf[0] = 0; |
|
|
|
if (preempt_count() != count) { |
|
sprintf(msgbuf, "preemption imbalance "); |
|
preempt_count_set(count); |
|
} |
|
if (irqs_disabled()) { |
|
strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
|
local_irq_enable(); |
|
} |
|
WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
|
|
|
add_latent_entropy(); |
|
return ret; |
|
} |
|
|
|
|
|
extern initcall_entry_t __initcall_start[]; |
|
extern initcall_entry_t __initcall0_start[]; |
|
extern initcall_entry_t __initcall1_start[]; |
|
extern initcall_entry_t __initcall2_start[]; |
|
extern initcall_entry_t __initcall3_start[]; |
|
extern initcall_entry_t __initcall4_start[]; |
|
extern initcall_entry_t __initcall5_start[]; |
|
extern initcall_entry_t __initcall6_start[]; |
|
extern initcall_entry_t __initcall7_start[]; |
|
extern initcall_entry_t __initcall_end[]; |
|
|
|
static initcall_entry_t *initcall_levels[] __initdata = { |
|
__initcall0_start, |
|
__initcall1_start, |
|
__initcall2_start, |
|
__initcall3_start, |
|
__initcall4_start, |
|
__initcall5_start, |
|
__initcall6_start, |
|
__initcall7_start, |
|
__initcall_end, |
|
}; |
|
|
|
/* Keep these in sync with initcalls in include/linux/init.h */ |
|
static const char *initcall_level_names[] __initdata = { |
|
"pure", |
|
"core", |
|
"postcore", |
|
"arch", |
|
"subsys", |
|
"fs", |
|
"device", |
|
"late", |
|
}; |
|
|
|
static int __init ignore_unknown_bootoption(char *param, char *val, |
|
const char *unused, void *arg) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void __init do_initcall_level(int level, char *command_line) |
|
{ |
|
initcall_entry_t *fn; |
|
|
|
parse_args(initcall_level_names[level], |
|
command_line, __start___param, |
|
__stop___param - __start___param, |
|
level, level, |
|
NULL, ignore_unknown_bootoption); |
|
|
|
trace_initcall_level(initcall_level_names[level]); |
|
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
|
do_one_initcall(initcall_from_entry(fn)); |
|
} |
|
|
|
static void __init do_initcalls(void) |
|
{ |
|
int level; |
|
size_t len = strlen(saved_command_line) + 1; |
|
char *command_line; |
|
|
|
command_line = kzalloc(len, GFP_KERNEL); |
|
if (!command_line) |
|
panic("%s: Failed to allocate %zu bytes\n", __func__, len); |
|
|
|
for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { |
|
/* Parser modifies command_line, restore it each time */ |
|
strcpy(command_line, saved_command_line); |
|
do_initcall_level(level, command_line); |
|
} |
|
|
|
kfree(command_line); |
|
} |
|
|
|
/* |
|
* Ok, the machine is now initialized. None of the devices |
|
* have been touched yet, but the CPU subsystem is up and |
|
* running, and memory and process management works. |
|
* |
|
* Now we can finally start doing some real work.. |
|
*/ |
|
static void __init do_basic_setup(void) |
|
{ |
|
cpuset_init_smp(); |
|
driver_init(); |
|
init_irq_proc(); |
|
do_ctors(); |
|
usermodehelper_enable(); |
|
do_initcalls(); |
|
} |
|
|
|
static void __init do_pre_smp_initcalls(void) |
|
{ |
|
initcall_entry_t *fn; |
|
|
|
trace_initcall_level("early"); |
|
for (fn = __initcall_start; fn < __initcall0_start; fn++) |
|
do_one_initcall(initcall_from_entry(fn)); |
|
} |
|
|
|
static int run_init_process(const char *init_filename) |
|
{ |
|
const char *const *p; |
|
|
|
argv_init[0] = init_filename; |
|
pr_info("Run %s as init process\n", init_filename); |
|
pr_debug(" with arguments:\n"); |
|
for (p = argv_init; *p; p++) |
|
pr_debug(" %s\n", *p); |
|
pr_debug(" with environment:\n"); |
|
for (p = envp_init; *p; p++) |
|
pr_debug(" %s\n", *p); |
|
return kernel_execve(init_filename, argv_init, envp_init); |
|
} |
|
|
|
static int try_to_run_init_process(const char *init_filename) |
|
{ |
|
int ret; |
|
|
|
ret = run_init_process(init_filename); |
|
|
|
if (ret && ret != -ENOENT) { |
|
pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", |
|
init_filename, ret); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static noinline void __init kernel_init_freeable(void); |
|
|
|
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
|
bool rodata_enabled __ro_after_init = true; |
|
static int __init set_debug_rodata(char *str) |
|
{ |
|
return strtobool(str, &rodata_enabled); |
|
} |
|
__setup("rodata=", set_debug_rodata); |
|
#endif |
|
|
|
#ifdef CONFIG_STRICT_KERNEL_RWX |
|
static void mark_readonly(void) |
|
{ |
|
if (rodata_enabled) { |
|
/* |
|
* load_module() results in W+X mappings, which are cleaned |
|
* up with call_rcu(). Let's make sure that queued work is |
|
* flushed so that we don't hit false positives looking for |
|
* insecure pages which are W+X. |
|
*/ |
|
rcu_barrier(); |
|
mark_rodata_ro(); |
|
rodata_test(); |
|
} else |
|
pr_info("Kernel memory protection disabled.\n"); |
|
} |
|
#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) |
|
static inline void mark_readonly(void) |
|
{ |
|
pr_warn("Kernel memory protection not selected by kernel config.\n"); |
|
} |
|
#else |
|
static inline void mark_readonly(void) |
|
{ |
|
pr_warn("This architecture does not have kernel memory protection.\n"); |
|
} |
|
#endif |
|
|
|
void __weak free_initmem(void) |
|
{ |
|
free_initmem_default(POISON_FREE_INITMEM); |
|
} |
|
|
|
static int __ref kernel_init(void *unused) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* Wait until kthreadd is all set-up. |
|
*/ |
|
wait_for_completion(&kthreadd_done); |
|
|
|
kernel_init_freeable(); |
|
/* need to finish all async __init code before freeing the memory */ |
|
async_synchronize_full(); |
|
kprobe_free_init_mem(); |
|
ftrace_free_init_mem(); |
|
kgdb_free_init_mem(); |
|
free_initmem(); |
|
mark_readonly(); |
|
|
|
/* |
|
* Kernel mappings are now finalized - update the userspace page-table |
|
* to finalize PTI. |
|
*/ |
|
pti_finalize(); |
|
|
|
system_state = SYSTEM_RUNNING; |
|
numa_default_policy(); |
|
|
|
rcu_end_inkernel_boot(); |
|
|
|
do_sysctl_args(); |
|
|
|
if (ramdisk_execute_command) { |
|
ret = run_init_process(ramdisk_execute_command); |
|
if (!ret) |
|
return 0; |
|
pr_err("Failed to execute %s (error %d)\n", |
|
ramdisk_execute_command, ret); |
|
} |
|
|
|
/* |
|
* We try each of these until one succeeds. |
|
* |
|
* The Bourne shell can be used instead of init if we are |
|
* trying to recover a really broken machine. |
|
*/ |
|
if (execute_command) { |
|
ret = run_init_process(execute_command); |
|
if (!ret) |
|
return 0; |
|
panic("Requested init %s failed (error %d).", |
|
execute_command, ret); |
|
} |
|
|
|
if (CONFIG_DEFAULT_INIT[0] != '\0') { |
|
ret = run_init_process(CONFIG_DEFAULT_INIT); |
|
if (ret) |
|
pr_err("Default init %s failed (error %d)\n", |
|
CONFIG_DEFAULT_INIT, ret); |
|
else |
|
return 0; |
|
} |
|
|
|
if (!try_to_run_init_process("/sbin/init") || |
|
!try_to_run_init_process("/etc/init") || |
|
!try_to_run_init_process("/bin/init") || |
|
!try_to_run_init_process("/bin/sh")) |
|
return 0; |
|
|
|
panic("No working init found. Try passing init= option to kernel. " |
|
"See Linux Documentation/admin-guide/init.rst for guidance."); |
|
} |
|
|
|
/* Open /dev/console, for stdin/stdout/stderr, this should never fail */ |
|
void __init console_on_rootfs(void) |
|
{ |
|
struct file *file = filp_open("/dev/console", O_RDWR, 0); |
|
|
|
if (IS_ERR(file)) { |
|
pr_err("Warning: unable to open an initial console.\n"); |
|
return; |
|
} |
|
init_dup(file); |
|
init_dup(file); |
|
init_dup(file); |
|
fput(file); |
|
} |
|
|
|
static noinline void __init kernel_init_freeable(void) |
|
{ |
|
/* Now the scheduler is fully set up and can do blocking allocations */ |
|
gfp_allowed_mask = __GFP_BITS_MASK; |
|
|
|
/* |
|
* init can allocate pages on any node |
|
*/ |
|
set_mems_allowed(node_states[N_MEMORY]); |
|
|
|
cad_pid = get_pid(task_pid(current)); |
|
|
|
smp_prepare_cpus(setup_max_cpus); |
|
|
|
workqueue_init(); |
|
|
|
init_mm_internals(); |
|
|
|
rcu_init_tasks_generic(); |
|
do_pre_smp_initcalls(); |
|
lockup_detector_init(); |
|
|
|
smp_init(); |
|
sched_init_smp(); |
|
|
|
padata_init(); |
|
page_alloc_init_late(); |
|
/* Initialize page ext after all struct pages are initialized. */ |
|
page_ext_init(); |
|
|
|
do_basic_setup(); |
|
|
|
kunit_run_all_tests(); |
|
|
|
wait_for_initramfs(); |
|
console_on_rootfs(); |
|
|
|
/* |
|
* check if there is an early userspace init. If yes, let it do all |
|
* the work |
|
*/ |
|
if (init_eaccess(ramdisk_execute_command) != 0) { |
|
ramdisk_execute_command = NULL; |
|
prepare_namespace(); |
|
} |
|
|
|
/* |
|
* Ok, we have completed the initial bootup, and |
|
* we're essentially up and running. Get rid of the |
|
* initmem segments and start the user-mode stuff.. |
|
* |
|
* rootfs is available now, try loading the public keys |
|
* and default modules |
|
*/ |
|
|
|
integrity_load_keys(); |
|
}
|
|
|