mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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59a2ceeef6
Merge more updates from Andrew Morton: "87 patches. Subsystems affected by this patch series: mm (pagecache and hugetlb), procfs, misc, MAINTAINERS, lib, checkpatch, binfmt, kallsyms, ramfs, init, codafs, nilfs2, hfs, crash_dump, signals, seq_file, fork, sysvfs, kcov, gdb, resource, selftests, and ipc" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (87 commits) ipc/ipc_sysctl.c: remove fallback for !CONFIG_PROC_SYSCTL ipc: check checkpoint_restore_ns_capable() to modify C/R proc files selftests/kselftest/runner/run_one(): allow running non-executable files virtio-mem: disallow mapping virtio-mem memory via /dev/mem kernel/resource: disallow access to exclusive system RAM regions kernel/resource: clean up and optimize iomem_is_exclusive() scripts/gdb: handle split debug for vmlinux kcov: replace local_irq_save() with a local_lock_t kcov: avoid enable+disable interrupts if !in_task() kcov: allocate per-CPU memory on the relevant node Documentation/kcov: define `ip' in the example Documentation/kcov: include types.h in the example sysv: use BUILD_BUG_ON instead of runtime check kernel/fork.c: unshare(): use swap() to make code cleaner seq_file: fix passing wrong private data seq_file: move seq_escape() to a header signal: remove duplicate include in signal.h crash_dump: remove duplicate include in crash_dump.h crash_dump: fix boolreturn.cocci warning hfs/hfsplus: use WARN_ON for sanity check ...
1637 lines
40 KiB
C
1637 lines
40 KiB
C
// 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 <grif@acm.org>
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*/
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#define DEBUG /* Enable initcall_debug */
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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/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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#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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#define CREATE_TRACE_POINTS
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#include <trace/events/initcall.h>
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#include <kunit/test.h>
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static int kernel_init(void *);
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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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* 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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enum system_states system_state __read_mostly;
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EXPORT_SYMBOL(system_state);
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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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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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/* 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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#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 size_t initargs_offs;
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#else
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# define bootconfig_found false
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# define initargs_offs 0
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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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* 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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* 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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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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extern const struct obs_kernel_param __setup_start[], __setup_end[];
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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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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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return buf - (end - size);
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}
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#undef rest
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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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/* 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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memblock_free(new_cmdline, len + 1);
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return NULL;
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}
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return new_cmdline;
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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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static int __init warn_bootconfig(char *str)
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{
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/* The 'bootconfig' has been handled by bootconfig_params(). */
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return 0;
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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, *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 the next param of '--' and returns an address */
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if (err)
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initargs_offs = err - tmp_cmdline;
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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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}
|
|
|
|
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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}
|
|
|
|
if (xbc_calc_checksum(data, size) != csum) {
|
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pr_err("bootconfig checksum failed\n");
|
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return;
|
|
}
|
|
|
|
ret = xbc_init(data, size, &msg, &pos);
|
|
if (ret < 0) {
|
|
if (pos < 0)
|
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pr_err("Failed to init bootconfig: %s.\n", msg);
|
|
else
|
|
pr_err("Failed to parse bootconfig: %s at %d.\n",
|
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msg, pos);
|
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} else {
|
|
xbc_get_info(&ret, NULL);
|
|
pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
|
|
/* keys starting with "kernel." are passed via cmdline */
|
|
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, 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);
|
|
|
|
/* 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;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unknown boot options get handed to init, unless they look like
|
|
* unused parameters (modprobe will find them in /proc/cmdline).
|
|
*/
|
|
static int __init unknown_bootoption(char *param, char *val,
|
|
const char *unused, void *arg)
|
|
{
|
|
size_t len = strlen(param);
|
|
|
|
repair_env_string(param, val);
|
|
|
|
/* Handle obsolete-style parameters */
|
|
if (obsolete_checksetup(param))
|
|
return 0;
|
|
|
|
/* Unused module parameter. */
|
|
if (strnchr(param, len, '.'))
|
|
return 0;
|
|
|
|
if (panic_later)
|
|
return 0;
|
|
|
|
if (val) {
|
|
/* Environment option */
|
|
unsigned int i;
|
|
for (i = 0; envp_init[i]; i++) {
|
|
if (i == MAX_INIT_ENVS) {
|
|
panic_later = "env";
|
|
panic_param = param;
|
|
}
|
|
if (!strncmp(param, envp_init[i], len+1))
|
|
break;
|
|
}
|
|
envp_init[i] = param;
|
|
} else {
|
|
/* Command line option */
|
|
unsigned int i;
|
|
for (i = 0; argv_init[i]; i++) {
|
|
if (i == MAX_INIT_ARGS) {
|
|
panic_later = "init";
|
|
panic_param = param;
|
|
}
|
|
}
|
|
argv_init[i] = param;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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]
|
|
*/
|
|
for (i = 1; i < MAX_INIT_ARGS; i++)
|
|
argv_init[i] = NULL;
|
|
return 1;
|
|
}
|
|
__setup("init=", init_setup);
|
|
|
|
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++)
|
|
argv_init[i] = NULL;
|
|
return 1;
|
|
}
|
|
__setup("rdinit=", rdinit_setup);
|
|
|
|
#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.
|
|
* The order should always be
|
|
* " -- "[bootconfig init-param][cmdline init-param]
|
|
*/
|
|
if (initargs_offs) {
|
|
len = xlen + initargs_offs;
|
|
strcpy(saved_command_line + len, extra_init_args);
|
|
len += ilen - 4; /* strlen(extra_init_args) */
|
|
strcpy(saved_command_line + len,
|
|
boot_command_line + initargs_offs - 1);
|
|
} else {
|
|
len = strlen(saved_command_line);
|
|
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) { }
|
|
|
|
void __init __weak trap_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);
|
|
|
|
/* Start at unknown_options[1] to skip the initial space */
|
|
pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n",
|
|
&unknown_options[1]);
|
|
memblock_free(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();
|
|
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();
|
|
|
|
system_state = SYSTEM_FREEING_INITMEM;
|
|
kprobe_free_init_mem();
|
|
ftrace_free_init_mem();
|
|
kgdb_free_init_mem();
|
|
exit_boot_config();
|
|
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();
|
|
}
|