init/main.c

   1 /*
   2  *  linux/init/main.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *
   6  *  GK 2/5/95  -  Changed to support mounting root fs via NFS
   7  *  Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
   8  *  Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
   9  *  Simplified starting of init:  Michael A. Griffith <grif@acm.org>
  10  */
  11
  12 #define DEBUG           /* Enable initcall_debug */
  13
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/kernel.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/stackprotector.h>
  20 #include <linux/string.h>
  21 #include <linux/ctype.h>
  22 #include <linux/delay.h>
  23 #include <linux/ioport.h>
  24 #include <linux/init.h>
  25 #include <linux/initrd.h>
  26 #include <linux/bootmem.h>
  27 #include <linux/acpi.h>
  28 #include <linux/tty.h>
  29 #include <linux/percpu.h>
  30 #include <linux/kmod.h>
  31 #include <linux/vmalloc.h>
  32 #include <linux/kernel_stat.h>
  33 #include <linux/start_kernel.h>
  34 #include <linux/security.h>
  35 #include <linux/smp.h>
  36 #include <linux/profile.h>
  37 #include <linux/rcupdate.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/kallsyms.h>
  40 #include <linux/writeback.h>
  41 #include <linux/cpu.h>
  42 #include <linux/cpuset.h>
  43 #include <linux/cgroup.h>
  44 #include <linux/efi.h>
  45 #include <linux/tick.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/taskstats_kern.h>
  48 #include <linux/delayacct.h>
  49 #include <linux/unistd.h>
  50 #include <linux/rmap.h>
  51 #include <linux/mempolicy.h>
  52 #include <linux/key.h>
  53 #include <linux/buffer_head.h>
  54 #include <linux/page_cgroup.h>
  55 #include <linux/debug_locks.h>
  56 #include <linux/debugobjects.h>
  57 #include <linux/lockdep.h>
  58 #include <linux/kmemleak.h>
  59 #include <linux/pid_namespace.h>
  60 #include <linux/device.h>
  61 #include <linux/kthread.h>
  62 #include <linux/sched.h>
  63 #include <linux/signal.h>
  64 #include <linux/idr.h>
  65 #include <linux/kgdb.h>
  66 #include <linux/ftrace.h>
  67 #include <linux/async.h>
  68 #include <linux/kmemcheck.h>
  69 #include <linux/sfi.h>
  70 #include <linux/shmem_fs.h>
  71 #include <linux/slab.h>
  72 #include <linux/perf_event.h>
  73 #include <linux/file.h>
  74 #include <linux/ptrace.h>
  75 #include <linux/blkdev.h>
  76 #include <linux/elevator.h>
  77 #include <linux/random.h>
  78 #include <linux/sched_clock.h>
  79
  80 #include <asm/io.h>
  81 #include <asm/bugs.h>
  82 #include <asm/setup.h>
  83 #include <asm/sections.h>
  84 #include <asm/cacheflush.h>
  85
  86 #ifdef CONFIG_X86_LOCAL_APIC
  87 #include <asm/smp.h>
  88 #endif
  89
  90 #ifdef CONFIG_TIMA_RKP
  91 #include <linux/vmm.h>
  92 #include <linux/rkp_entry.h>
  93 #endif //CONFIG_TIMA_RKP
  94
  95 static int kernel_init(void *);
  96
  97 extern void init_IRQ(void);
  98 extern void fork_init(unsigned long);
  99 extern void mca_init(void);
 100 extern void sbus_init(void);
 101 extern void radix_tree_init(void);
 102 #ifndef CONFIG_DEBUG_RODATA
 103 static inline void mark_rodata_ro(void) { }
 104 #endif
 105
 106 #ifdef CONFIG_TC
 107 extern void tc_init(void);
 108 #endif
 109
 110 #if defined(CONFIG_USE_HOST_FD_LIBRARY)
 111 extern void *fd_vaddr;
 112 #endif
 113
 114 #ifdef CONFIG_KNOX_KAP
 115 int boot_mode_security;
 116 EXPORT_SYMBOL(boot_mode_security);
 117 #endif
 118
 119 /*
 120  * Debug helper: via this flag we know that we are in 'early bootup code'
 121  * where only the boot processor is running with IRQ disabled.  This means
 122  * two things - IRQ must not be enabled before the flag is cleared and some
 123  * operations which are not allowed with IRQ disabled are allowed while the
 124  * flag is set.
 125  */
 126 bool early_boot_irqs_disabled __read_mostly;
 127
 128 enum system_states system_state __read_mostly;
 129 EXPORT_SYMBOL(system_state);
 130
 131 /*
 132  * Boot command-line arguments
 133  */
 134 #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
 135 #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
 136
 137 extern void time_init(void);
 138 /* Default late time init is NULL. archs can override this later. */
 139 void (*__initdata late_time_init)(void);
 140 extern void softirq_init(void);
 141
 142 /* Untouched command line saved by arch-specific code. */
 143 char __initdata boot_command_line[COMMAND_LINE_SIZE];
 144 /* Untouched saved command line (eg. for /proc) */
 145 char *saved_command_line;
 146 /* Command line for parameter parsing */
 147 static char *static_command_line;
 148
 149 static char *execute_command;
 150 static char *ramdisk_execute_command;
 151
 152 /*
 153  * If set, this is an indication to the drivers that reset the underlying
 154  * device before going ahead with the initialization otherwise driver might
 155  * rely on the BIOS and skip the reset operation.
 156  *
 157  * This is useful if kernel is booting in an unreliable environment.
 158  * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
 159  * skipped and devices will be in unknown state.
 160  */
 161 unsigned int reset_devices;
 162 EXPORT_SYMBOL(reset_devices);
 163
 164 static int __init set_reset_devices(char *str)
 165 {
 166         reset_devices = 1;
 167         return 1;
 168 }
 169
 170 __setup("reset_devices", set_reset_devices);
 171
 172 static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
 173 const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
 174 static const char *panic_later, *panic_param;
 175
 176 extern const struct obs_kernel_param __setup_start[], __setup_end[];
 177
 178 static int __init obsolete_checksetup(char *line)
 179 {
 180         const struct obs_kernel_param *p;
 181         int had_early_param = 0;
 182
 183         p = __setup_start;
 184         do {
 185                 int n = strlen(p->str);
 186                 if (parameqn(line, p->str, n)) {
 187                         if (p->early) {
 188                                 /* Already done in parse_early_param?
 189                                  * (Needs exact match on param part).
 190                                  * Keep iterating, as we can have early
 191                                  * params and __setups of same names 8( */
 192                                 if (line[n] == '\0' || line[n] == '=')
 193                                         had_early_param = 1;
 194                         } else if (!p->setup_func) {
 195                                 pr_warn("Parameter %s is obsolete, ignored\n",
 196                                         p->str);
 197                                 return 1;
 198                         } else if (p->setup_func(line + n))
 199                                 return 1;
 200                 }
 201                 p++;
 202         } while (p < __setup_end);
 203
 204         return had_early_param;
 205 }
 206
 207 /*
 208  * This should be approx 2 Bo*oMips to start (note initial shift), and will
 209  * still work even if initially too large, it will just take slightly longer
 210  */
 211 unsigned long loops_per_jiffy = (1<<12);
 212
 213 EXPORT_SYMBOL(loops_per_jiffy);
 214
 215 static int __init debug_kernel(char *str)
 216 {
 217         console_loglevel = 10;
 218         return 0;
 219 }
 220
 221 static int __init quiet_kernel(char *str)
 222 {
 223         console_loglevel = 4;
 224         return 0;
 225 }
 226
 227 early_param("debug", debug_kernel);
 228 early_param("quiet", quiet_kernel);
 229
 230 static int __init loglevel(char *str)
 231 {
 232         int newlevel;
 233
 234         /*
 235          * Only update loglevel value when a correct setting was passed,
 236          * to prevent blind crashes (when loglevel being set to 0) that
 237          * are quite hard to debug
 238          */
 239         if (get_option(&str, &newlevel)) {
 240                 console_loglevel = newlevel;
 241                 return 0;
 242         }
 243
 244         return -EINVAL;
 245 }
 246
 247 early_param("loglevel", loglevel);
 248
 249 /* Change NUL term back to "=", to make "param" the whole string. */
 250 static int __init repair_env_string(char *param, char *val, const char *unused)
 251 {
 252         if (val) {
 253                 /* param=val or param="val"? */
 254                 if (val == param+strlen(param)+1)
 255                         val[-1] = '=';
 256                 else if (val == param+strlen(param)+2) {
 257                         val[-2] = '=';
 258                         memmove(val-1, val, strlen(val)+1);
 259                         val--;
 260                 } else
 261                         BUG();
 262         }
 263         return 0;
 264 }
 265
 266 /*
 267  * Unknown boot options get handed to init, unless they look like
 268  * unused parameters (modprobe will find them in /proc/cmdline).
 269  */
 270 static int __init unknown_bootoption(char *param, char *val, const char *unused)
 271 {
 272         repair_env_string(param, val, unused);
 273
 274         /* Handle obsolete-style parameters */
 275         if (obsolete_checksetup(param))
 276                 return 0;
 277
 278         /* Unused module parameter. */
 279         if (strchr(param, '.') && (!val || strchr(param, '.') < val))
 280                 return 0;
 281
 282         if (panic_later)
 283                 return 0;
 284
 285         if (val) {
 286                 /* Environment option */
 287                 unsigned int i;
 288                 for (i = 0; envp_init[i]; i++) {
 289                         if (i == MAX_INIT_ENVS) {
 290                                 panic_later = "Too many boot env vars at `%s'";
 291                                 panic_param = param;
 292                         }
 293                         if (!strncmp(param, envp_init[i], val - param))
 294                                 break;
 295                 }
 296                 envp_init[i] = param;
 297         } else {
 298                 /* Command line option */
 299                 unsigned int i;
 300                 for (i = 0; argv_init[i]; i++) {
 301                         if (i == MAX_INIT_ARGS) {
 302                                 panic_later = "Too many boot init vars at `%s'";
 303                                 panic_param = param;
 304                         }
 305                 }
 306                 argv_init[i] = param;
 307         }
 308         return 0;
 309 }
 310
 311 static int __init init_setup(char *str)
 312 {
 313         unsigned int i;
 314
 315         execute_command = str;
 316         /*
 317          * In case LILO is going to boot us with default command line,
 318          * it prepends "auto" before the whole cmdline which makes
 319          * the shell think it should execute a script with such name.
 320          * So we ignore all arguments entered _before_ init=... [MJ]
 321          */
 322         for (i = 1; i < MAX_INIT_ARGS; i++)
 323                 argv_init[i] = NULL;
 324         return 1;
 325 }
 326 __setup("init=", init_setup);
 327
 328 static int __init rdinit_setup(char *str)
 329 {
 330         unsigned int i;
 331
 332         ramdisk_execute_command = str;
 333         /* See "auto" comment in init_setup */
 334         for (i = 1; i < MAX_INIT_ARGS; i++)
 335                 argv_init[i] = NULL;
 336         return 1;
 337 }
 338 __setup("rdinit=", rdinit_setup);
 339
 340 #ifndef CONFIG_SMP
 341 static const unsigned int setup_max_cpus = NR_CPUS;
 342 #ifdef CONFIG_X86_LOCAL_APIC
 343 static void __init smp_init(void)
 344 {
 345         APIC_init_uniprocessor();
 346 }
 347 #else
 348 #define smp_init()      do { } while (0)
 349 #endif
 350
 351 static inline void setup_nr_cpu_ids(void) { }
 352 static inline void smp_prepare_cpus(unsigned int maxcpus) { }
 353 #endif
 354
 355 /*
 356  * We need to store the untouched command line for future reference.
 357  * We also need to store the touched command line since the parameter
 358  * parsing is performed in place, and we should allow a component to
 359  * store reference of name/value for future reference.
 360  */
 361 static void __init setup_command_line(char *command_line)
 362 {
 363         saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
 364         static_command_line = alloc_bootmem(strlen (command_line)+1);
 365         strcpy (saved_command_line, boot_command_line);
 366         strcpy (static_command_line, command_line);
 367 }
 368
 369 /*
 370  * We need to finalize in a non-__init function or else race conditions
 371  * between the root thread and the init thread may cause start_kernel to
 372  * be reaped by free_initmem before the root thread has proceeded to
 373  * cpu_idle.
 374  *
 375  * gcc-3.4 accidentally inlines this function, so use noinline.
 376  */
 377
 378 static __initdata DECLARE_COMPLETION(kthreadd_done);
 379
 380 static noinline void __init_refok rest_init(void)
 381 {
 382         int pid;
 383
 384         rcu_scheduler_starting();
 385         /*
 386          * We need to spawn init first so that it obtains pid 1, however
 387          * the init task will end up wanting to create kthreads, which, if
 388          * we schedule it before we create kthreadd, will OOPS.
 389          */
 390         kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
 391         numa_default_policy();
 392         pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
 393         rcu_read_lock();
 394         kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
 395         rcu_read_unlock();
 396         complete(&kthreadd_done);
 397
 398         /*
 399          * The boot idle thread must execute schedule()
 400          * at least once to get things moving:
 401          */
 402         init_idle_bootup_task(current);
 403         schedule_preempt_disabled();
 404         /* Call into cpu_idle with preempt disabled */
 405         cpu_startup_entry(CPUHP_ONLINE);
 406 }
 407
 408 /* Check for early params. */
 409 static int __init do_early_param(char *param, char *val, const char *unused)
 410 {
 411         const struct obs_kernel_param *p;
 412
 413         for (p = __setup_start; p < __setup_end; p++) {
 414                 if ((p->early && parameq(param, p->str)) ||
 415                     (strcmp(param, "console") == 0 &&
 416                      strcmp(p->str, "earlycon") == 0)
 417                 ) {
 418                         if (p->setup_func(val) != 0)
 419                                 pr_warn("Malformed early option '%s'\n", param);
 420                 }
 421         }
 422         /* We accept everything at this stage. */
 423 #ifdef CONFIG_KNOX_KAP
 424         if ((strncmp(param, "androidboot.security_mode", 26) == 0)) {
 425                 pr_warn("val = %d\n",*val);
 426                 if ((strncmp(val, "1526595585", 10) == 0)) {
 427                                 pr_info("Security Boot Mode \n");
 428                                 boot_mode_security = 1;
 429 #ifdef CONFIG_RKP_KDP
 430                                 rkp_cred_enable = 1;
 431 #endif /*CONFIG_RKP_KDP*/
 432                         }
 433         }
 434 #endif
 435         return 0;
 436 }
 437
 438 void __init parse_early_options(char *cmdline)
 439 {
 440         parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
 441 }
 442
 443 /* Arch code calls this early on, or if not, just before other parsing. */
 444 void __init parse_early_param(void)
 445 {
 446         static __initdata int done = 0;
 447         static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
 448
 449         if (done)
 450                 return;
 451
 452         /* All fall through to do_early_param. */
 453         strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 454         parse_early_options(tmp_cmdline);
 455         done = 1;
 456 }
 457
 458 /*
 459  *      Activate the first processor.
 460  */
 461
 462 static void __init boot_cpu_init(void)
 463 {
 464         int cpu = smp_processor_id();
 465         /* Mark the boot cpu "present", "online" etc for SMP and UP case */
 466         set_cpu_online(cpu, true);
 467         set_cpu_active(cpu, true);
 468         set_cpu_present(cpu, true);
 469         set_cpu_possible(cpu, true);
 470 }
 471
 472 void __init __weak smp_setup_processor_id(void)
 473 {
 474 }
 475
 476 # if THREAD_SIZE >= PAGE_SIZE
 477 void __init __weak thread_info_cache_init(void)
 478 {
 479 }
 480 #endif
 481
 482 /*
 483  * Set up kernel memory allocators
 484  */
 485 static void __init mm_init(void)
 486 {
 487         /*
 488          * page_cgroup requires contiguous pages,
 489          * bigger than MAX_ORDER unless SPARSEMEM.
 490          */
 491         page_cgroup_init_flatmem();
 492         mem_init();
 493         kmem_cache_init();
 494         percpu_init_late();
 495         pgtable_cache_init();
 496         vmalloc_init();
 497 }
 498 #ifdef  CONFIG_TIMA_RKP
 499 extern void* vmm_extra_mem;
 500 u8 rkp_started = 0;
 501 static void rkp_init(void)
 502 {
 503         rkp_init_t init;
 504         init.magic = RKP_INIT_MAGIC;
 505         init.vmalloc_start = VMALLOC_START;
 506         init.vmalloc_end = (u64)high_memory;
 507         init.init_mm_pgd = (u64)__pa(swapper_pg_dir);
 508         init.id_map_pgd = (u64)__pa(idmap_pg_dir);
 509         init.rkp_pgt_bitmap = (u64)__pa(rkp_pgt_bitmap);
 510         init.rkp_map_bitmap = (u64)__pa(rkp_map_bitmap);
 511         init.rkp_pgt_bitmap_size = RKP_PGT_BITMAP_LEN;
 512         init.zero_pg_addr = page_to_phys(empty_zero_page);
 513         init._text = (u64) _text;
 514         init._etext = (u64) _etext;
 515         if (!vmm_extra_mem) {
 516                 printk(KERN_ERR"Disable RKP: Failed to allocate extra mem\n");
 517                 return;
 518         }
 519         init.extra_memory_addr = __pa(vmm_extra_mem);
 520         init.extra_memory_size = 0x600000;
 521         init._srodata = (u64) __start_rodata;
 522         init._erodata =(u64) __end_rodata;
 523 #if defined(CONFIG_USE_HOST_FD_LIBRARY)
 524         init.large_memory = (u32) virt_to_phys(fd_vaddr);
 525 #else
 526         init.large_memory = 0;
 527 #endif
 528         rkp_call(RKP_INIT, (u64)&init, 0, 0, 0, 0);
 529         rkp_started = 1;
 530         return;
 531 }
 532 #endif
 533 #ifdef CONFIG_RKP_KDP
 534
 535 void kdp_init(void)
 536 {
 537         kdp_init_t cred;
 538
 539         cred.credSize   = sizeof(struct cred);
 540         cred.pgd_mm     = offsetof(struct mm_struct,pgd);
 541         cred.uid_cred   = offsetof(struct cred,uid);
 542         cred.euid_cred  = offsetof(struct cred,euid);
 543
 544         cred.bp_pgd_cred        = offsetof(struct cred,bp_pgd);
 545         cred.bp_task_cred       = offsetof(struct cred,bp_task);
 546         cred.type_cred          = offsetof(struct cred,type);
 547         cred.security_cred      = offsetof(struct cred,security);
 548         cred.usage_cred         = offsetof(struct cred,use_cnt);
 549
 550         cred.cred_task          = offsetof(struct task_struct,cred);
 551         cred.mm_task            = offsetof(struct task_struct,mm);
 552         cred.pid_task           = offsetof(struct task_struct,pid);
 553         cred.rp_task            = offsetof(struct task_struct,real_parent);
 554         cred.comm_task          = offsetof(struct task_struct,comm);
 555
 556         cred.task_threadinfo = offsetof(struct thread_info,task);
 557         rkp_call(RKP_CMDID(0x40),(u64)&cred,0,0,0,0);
 558 }
 559 #endif /*CONFIG_RKP_KDP*/
 560
 561 asmlinkage void __init start_kernel(void)
 562 {
 563         char * command_line;
 564         extern const struct kernel_param __start___param[], __stop___param[];
 565
 566         /*
 567          * Need to run as early as possible, to initialize the
 568          * lockdep hash:
 569          */
 570         lockdep_init();
 571         smp_setup_processor_id();
 572         debug_objects_early_init();
 573
 574         /*
 575          * Set up the the initial canary ASAP:
 576          */
 577         boot_init_stack_canary();
 578
 579         cgroup_init_early();
 580
 581         local_irq_disable();
 582         early_boot_irqs_disabled = true;
 583
 584 /*
 585  * Interrupts are still disabled. Do necessary setups, then
 586  * enable them
 587  */
 588         boot_cpu_init();
 589         page_address_init();
 590         pr_notice("%s", linux_banner);
 591         setup_arch(&command_line);
 592         mm_init_owner(&init_mm, &init_task);
 593         mm_init_cpumask(&init_mm);
 594         setup_command_line(command_line);
 595         setup_nr_cpu_ids();
 596         setup_per_cpu_areas();
 597         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 598
 599         build_all_zonelists(NULL, NULL);
 600         page_alloc_init();
 601
 602         pr_notice("Kernel command line: %s\n", boot_command_line);
 603         parse_early_param();
 604         parse_args("Booting kernel", static_command_line, __start___param,
 605                    __stop___param - __start___param,
 606                    -1, -1, &unknown_bootoption);
 607 #ifdef CONFIG_TIMA_RKP
 608 #ifdef CONFIG_KNOX_KAP
 609         if (boot_mode_security)
 610                 vmm_init();
 611         else
 612                 vmm_disable();
 613 #else
 614         vmm_init();
 615 #endif //CONFIG_KNOX_KAP
 616 #endif //CONFIG_TIMA_RKP
 617         jump_label_init();
 618
 619         /*
 620          * These use large bootmem allocations and must precede
 621          * kmem_cache_init()
 622          */
 623         setup_log_buf(0);
 624         pidhash_init();
 625         vfs_caches_init_early();
 626         sort_main_extable();
 627         trap_init();
 628         mm_init();
 629
 630         /*
 631          * Set up the scheduler prior starting any interrupts (such as the
 632          * timer interrupt). Full topology setup happens at smp_init()
 633          * time - but meanwhile we still have a functioning scheduler.
 634          */
 635         sched_init();
 636         /*
 637          * Disable preemption - early bootup scheduling is extremely
 638          * fragile until we cpu_idle() for the first time.
 639          */
 640         preempt_disable();
 641         if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n"))
 642                 local_irq_disable();
 643         idr_init_cache();
 644         perf_event_init();
 645         rcu_init();
 646         tick_nohz_init();
 647         radix_tree_init();
 648         /* init some links before init_ISA_irqs() */
 649         early_irq_init();
 650         init_IRQ();
 651         tick_init();
 652         init_timers();
 653         hrtimers_init();
 654         softirq_init();
 655         timekeeping_init();
 656         time_init();
 657         sched_clock_postinit();
 658         profile_init();
 659         call_function_init();
 660         WARN(!irqs_disabled(), "Interrupts were enabled early\n");
 661         early_boot_irqs_disabled = false;
 662         local_irq_enable();
 663
 664         kmem_cache_init_late();
 665
 666         /*
 667          * HACK ALERT! This is early. We're enabling the console before
 668          * we've done PCI setups etc, and console_init() must be aware of
 669          * this. But we do want output early, in case something goes wrong.
 670          */
 671         console_init();
 672         if (panic_later)
 673                 panic(panic_later, panic_param);
 674
 675         lockdep_info();
 676
 677         /*
 678          * Need to run this when irqs are enabled, because it wants
 679          * to self-test [hard/soft]-irqs on/off lock inversion bugs
 680          * too:
 681          */
 682         locking_selftest();
 683
 684 #ifdef CONFIG_BLK_DEV_INITRD
 685         if (initrd_start && !initrd_below_start_ok &&
 686             page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
 687                 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
 688                     page_to_pfn(virt_to_page((void *)initrd_start)),
 689                     min_low_pfn);
 690                 initrd_start = 0;
 691         }
 692 #endif
 693         page_cgroup_init();
 694         debug_objects_mem_init();
 695         kmemleak_init();
 696         setup_per_cpu_pageset();
 697         numa_policy_init();
 698         if (late_time_init)
 699                 late_time_init();
 700         sched_clock_init();
 701         calibrate_delay();
 702         pidmap_init();
 703         anon_vma_init();
 704 #ifdef CONFIG_X86
 705         if (efi_enabled(EFI_RUNTIME_SERVICES))
 706                 efi_enter_virtual_mode();
 707 #endif
 708 #ifdef CONFIG_X86_ESPFIX64
 709         /* Should be run before the first non-init thread is created */
 710         init_espfix_bsp();
 711 #endif
 712         thread_info_cache_init();
 713 #ifdef CONFIG_TIMA_RKP
 714
 715 #ifdef CONFIG_KNOX_KAP
 716         if (boot_mode_security)
 717 #endif
 718                 rkp_init();
 719 #ifdef CONFIG_RKP_KDP
 720         if (rkp_cred_enable)
 721                 kdp_init();
 722 #endif /*CONFIG_RKP_KDP*/
 723 #endif /* CONFIG_TIMA_RKP */
 724         cred_init();
 725         fork_init(totalram_pages);
 726         proc_caches_init();
 727         buffer_init();
 728         key_init();
 729         security_init();
 730 #ifdef CONFIG_RKP_KDP
 731         if (rkp_cred_enable)
 732                 rkp_call(RKP_CMDID(0x51),(u64)__rkp_ro_start,0,0,0,0);
 733 #endif /*CONFIG_RKP_KDP*/
 734         dbg_late_init();
 735         vfs_caches_init(totalram_pages);
 736         signals_init();
 737         /* rootfs populating might need page-writeback */
 738         page_writeback_init();
 739 #ifdef CONFIG_PROC_FS
 740         proc_root_init();
 741 #endif
 742         cgroup_init();
 743         cpuset_init();
 744         taskstats_init_early();
 745         delayacct_init();
 746
 747         check_bugs();
 748
 749         acpi_early_init(); /* before LAPIC and SMP init */
 750         sfi_init_late();
 751
 752         if (efi_enabled(EFI_RUNTIME_SERVICES)) {
 753                 efi_late_init();
 754                 efi_free_boot_services();
 755         }
 756
 757         ftrace_init();
 758
 759         /* Do the rest non-__init'ed, we're now alive */
 760         rest_init();
 761 }
 762
 763 /* Call all constructor functions linked into the kernel. */
 764 static void __init do_ctors(void)
 765 {
 766 #ifdef CONFIG_CONSTRUCTORS
 767         ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
 768
 769         for (; fn < (ctor_fn_t *) __ctors_end; fn++)
 770                 (*fn)();
 771 #endif
 772 }
 773
 774 bool initcall_debug;
 775 core_param(initcall_debug, initcall_debug, bool, 0644);
 776
 777 static char msgbuf[64];
 778
 779 static int __init_or_module do_one_initcall_debug(initcall_t fn)
 780 {
 781         ktime_t calltime, delta, rettime;
 782         unsigned long long duration;
 783         int ret;
 784
 785         pr_debug("calling  %pF @ %i\n", fn, task_pid_nr(current));
 786         calltime = ktime_get();
 787         ret = fn();
 788         rettime = ktime_get();
 789         delta = ktime_sub(rettime, calltime);
 790         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 791         pr_debug("initcall %pF returned %d after %lld usecs\n",
 792                  fn, ret, duration);
 793
 794         return ret;
 795 }
 796
 797 int __init_or_module do_one_initcall(initcall_t fn)
 798 {
 799         int count = preempt_count();
 800         int ret;
 801
 802         if (initcall_debug)
 803                 ret = do_one_initcall_debug(fn);
 804         else
 805                 ret = fn();
 806
 807         msgbuf[0] = 0;
 808
 809         if (preempt_count() != count) {
 810                 sprintf(msgbuf, "preemption imbalance ");
 811                 preempt_count() = count;
 812         }
 813         if (irqs_disabled()) {
 814                 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
 815                 local_irq_enable();
 816         }
 817         WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
 818
 819         return ret;
 820 }
 821
 822
 823 extern initcall_t __initcall_start[];
 824 extern initcall_t __initcall0_start[];
 825 extern initcall_t __initcall1_start[];
 826 extern initcall_t __initcall2_start[];
 827 extern initcall_t __initcall3_start[];
 828 extern initcall_t __initcall4_start[];
 829 extern initcall_t __initcall5_start[];
 830 extern initcall_t __initcall6_start[];
 831 extern initcall_t __initcall7_start[];
 832 extern initcall_t __initcall_end[];
 833
 834 static initcall_t *initcall_levels[] __initdata = {
 835         __initcall0_start,
 836         __initcall1_start,
 837         __initcall2_start,
 838         __initcall3_start,
 839         __initcall4_start,
 840         __initcall5_start,
 841         __initcall6_start,
 842         __initcall7_start,
 843         __initcall_end,
 844 };
 845
 846 /* Keep these in sync with initcalls in include/linux/init.h */
 847 static char *initcall_level_names[] __initdata = {
 848         "early",
 849         "core",
 850         "postcore",
 851         "arch",
 852         "subsys",
 853         "fs",
 854         "device",
 855         "late",
 856 };
 857
 858 static void __init do_initcall_level(int level)
 859 {
 860         extern const struct kernel_param __start___param[], __stop___param[];
 861         initcall_t *fn;
 862
 863         strcpy(static_command_line, saved_command_line);
 864         parse_args(initcall_level_names[level],
 865                    static_command_line, __start___param,
 866                    __stop___param - __start___param,
 867                    level, level,
 868                    &repair_env_string);
 869
 870         for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
 871                 do_one_initcall(*fn);
 872 }
 873
 874 static void __init do_initcalls(void)
 875 {
 876         int level;
 877
 878         for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
 879                 do_initcall_level(level);
 880 }
 881
 882 /*
 883  * Ok, the machine is now initialized. None of the devices
 884  * have been touched yet, but the CPU subsystem is up and
 885  * running, and memory and process management works.
 886  *
 887  * Now we can finally start doing some real work..
 888  */
 889 static void __init do_basic_setup(void)
 890 {
 891         cpuset_init_smp();
 892         usermodehelper_init();
 893         shmem_init();
 894         driver_init();
 895         init_irq_proc();
 896         do_ctors();
 897         usermodehelper_enable();
 898         do_initcalls();
 899         random_int_secret_init();
 900 }
 901
 902 static void __init do_pre_smp_initcalls(void)
 903 {
 904         initcall_t *fn;
 905
 906         for (fn = __initcall_start; fn < __initcall0_start; fn++)
 907                 do_one_initcall(*fn);
 908 }
 909
 910 /*
 911  * This function requests modules which should be loaded by default and is
 912  * called twice right after initrd is mounted and right before init is
 913  * exec'd.  If such modules are on either initrd or rootfs, they will be
 914  * loaded before control is passed to userland.
 915  */
 916 void __init load_default_modules(void)
 917 {
 918         load_default_elevator_module();
 919 }
 920
 921 static int run_init_process(const char *init_filename)
 922 {
 923         argv_init[0] = init_filename;
 924         return do_execve(init_filename,
 925                 (const char __user *const __user *)argv_init,
 926                 (const char __user *const __user *)envp_init);
 927 }
 928
 929 #ifdef CONFIG_DEFERRED_INITCALLS
 930 extern initcall_t __deferred_initcall_start[], __deferred_initcall_end[];
 931
 932 /* call deferred init routines */
 933 void __ref do_deferred_initcalls(void)
 934 {
 935         initcall_t *call;
 936         static int already_run=0;
 937
 938         if (already_run) {
 939                 printk("do_deferred_initcalls() has already run\n");
 940                 return;
 941         }
 942
 943         already_run=1;
 944
 945         printk("Running do_deferred_initcalls()\n");
 946
 947         for(call = __deferred_initcall_start;
 948                 call < __deferred_initcall_end; call++)
 949                 do_one_initcall(*call);
 950
 951         flush_scheduled_work();
 952
 953         free_initmem();
 954 }
 955 #endif
 956
 957 #ifdef CONFIG_SEC_GPIO_DVS
 958 extern void gpio_dvs_check_initgpio(void);
 959 #endif
 960
 961 static noinline void __init kernel_init_freeable(void);
 962
 963 static int __ref kernel_init(void *unused)
 964 {
 965         kernel_init_freeable();
 966 #ifdef CONFIG_SEC_GPIO_DVS
 967         /* This function must be located in appropriate INIT position
 968          * in accordance with the specification of each BB vendor.
 969          */
 970         gpio_dvs_check_initgpio();
 971 #endif
 972         /* need to finish all async __init code before freeing the memory */
 973         async_synchronize_full();
 974 #ifndef CONFIG_DEFERRED_INITCALLS
 975         free_initmem();
 976 #endif
 977         mark_rodata_ro();
 978         system_state = SYSTEM_RUNNING;
 979         numa_default_policy();
 980
 981         flush_delayed_fput();
 982
 983         if (ramdisk_execute_command) {
 984                 if (!run_init_process(ramdisk_execute_command))
 985                         return 0;
 986                 pr_err("Failed to execute %s\n", ramdisk_execute_command);
 987         }
 988
 989         /*
 990          * We try each of these until one succeeds.
 991          *
 992          * The Bourne shell can be used instead of init if we are
 993          * trying to recover a really broken machine.
 994          */
 995         if (execute_command) {
 996                 if (!run_init_process(execute_command))
 997                         return 0;
 998                 pr_err("Failed to execute %s.  Attempting defaults...\n",
 999                         execute_command);
1000         }
1001         if (!run_init_process("/sbin/init") ||
1002             !run_init_process("/etc/init") ||
1003             !run_init_process("/bin/init") ||
1004             !run_init_process("/bin/sh"))
1005                 return 0;
1006
1007         panic("No init found.  Try passing init= option to kernel. "
1008               "See Linux Documentation/init.txt for guidance.");
1009 }
1010
1011 static noinline void __init kernel_init_freeable(void)
1012 {
1013         /*
1014          * Wait until kthreadd is all set-up.
1015          */
1016         wait_for_completion(&kthreadd_done);
1017
1018         /* Now the scheduler is fully set up and can do blocking allocations */
1019         gfp_allowed_mask = __GFP_BITS_MASK;
1020
1021         /*
1022          * init can allocate pages on any node
1023          */
1024         set_mems_allowed(node_states[N_MEMORY]);
1025         /*
1026          * init can run on any cpu.
1027          */
1028         set_cpus_allowed_ptr(current, cpu_all_mask);
1029
1030         cad_pid = task_pid(current);
1031
1032         smp_prepare_cpus(setup_max_cpus);
1033
1034         do_pre_smp_initcalls();
1035         lockup_detector_init();
1036
1037         smp_init();
1038         sched_init_smp();
1039
1040         do_basic_setup();
1041
1042         /* Open the /dev/console on the rootfs, this should never fail */
1043         if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
1044                 pr_err("Warning: unable to open an initial console.\n");
1045
1046         (void) sys_dup(0);
1047         (void) sys_dup(0);
1048         /*
1049          * check if there is an early userspace init.  If yes, let it do all
1050          * the work
1051          */
1052
1053         if (!ramdisk_execute_command)
1054                 ramdisk_execute_command = "/init";
1055
1056         if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
1057                 ramdisk_execute_command = NULL;
1058                 prepare_namespace();
1059         }
1060
1061         /*
1062          * Ok, we have completed the initial bootup, and
1063          * we're essentially up and running. Get rid of the
1064          * initmem segments and start the user-mode stuff..
1065          */
1066
1067         /* rootfs is available now, try loading default modules */
1068         load_default_modules();
1069 }