Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 __KERNEL_SYSCALLS__ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/syscalls.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/ctype.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/utsname.h> |
| 23 | #include <linux/ioport.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/smp_lock.h> |
| 26 | #include <linux/initrd.h> |
| 27 | #include <linux/hdreg.h> |
| 28 | #include <linux/bootmem.h> |
| 29 | #include <linux/tty.h> |
| 30 | #include <linux/gfp.h> |
| 31 | #include <linux/percpu.h> |
| 32 | #include <linux/kmod.h> |
| 33 | #include <linux/kernel_stat.h> |
| 34 | #include <linux/security.h> |
| 35 | #include <linux/workqueue.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/efi.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 44 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 45 | #include <linux/delayacct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/unistd.h> |
| 47 | #include <linux/rmap.h> |
| 48 | #include <linux/mempolicy.h> |
| 49 | #include <linux/key.h> |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 50 | #include <linux/unwind.h> |
Adrian Bunk | b6cd0b7 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 51 | #include <linux/buffer_head.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 52 | #include <linux/debug_locks.h> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 53 | #include <linux/lockdep.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #include <asm/io.h> |
| 56 | #include <asm/bugs.h> |
| 57 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 58 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 59 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #ifdef CONFIG_X86_LOCAL_APIC |
| 62 | #include <asm/smp.h> |
| 63 | #endif |
| 64 | |
| 65 | /* |
Coywolf Qi Hunt | 69c99ac | 2006-01-14 13:21:11 -0800 | [diff] [blame] | 66 | * This is one of the first .c files built. Error out early if we have compiler |
| 67 | * trouble. |
| 68 | * |
| 69 | * Versions of gcc older than that listed below may actually compile and link |
| 70 | * okay, but the end product can have subtle run time bugs. To avoid associated |
| 71 | * bogus bug reports, we flatly refuse to compile with a gcc that is known to be |
| 72 | * too old from the very beginning. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | */ |
Andrew Morton | fd285bb | 2006-01-08 01:04:07 -0800 | [diff] [blame] | 74 | #if (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #error Sorry, your GCC is too old. It builds incorrect kernels. |
| 76 | #endif |
| 77 | |
| 78 | static int init(void *); |
| 79 | |
| 80 | extern void init_IRQ(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | extern void fork_init(unsigned long); |
| 82 | extern void mca_init(void); |
| 83 | extern void sbus_init(void); |
| 84 | extern void sysctl_init(void); |
| 85 | extern void signals_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | extern void pidhash_init(void); |
| 87 | extern void pidmap_init(void); |
| 88 | extern void prio_tree_init(void); |
| 89 | extern void radix_tree_init(void); |
| 90 | extern void free_initmem(void); |
| 91 | extern void populate_rootfs(void); |
| 92 | extern void driver_init(void); |
| 93 | extern void prepare_namespace(void); |
| 94 | #ifdef CONFIG_ACPI |
| 95 | extern void acpi_early_init(void); |
| 96 | #else |
| 97 | static inline void acpi_early_init(void) { } |
| 98 | #endif |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 99 | #ifndef CONFIG_DEBUG_RODATA |
| 100 | static inline void mark_rodata_ro(void) { } |
| 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | #ifdef CONFIG_TC |
| 104 | extern void tc_init(void); |
| 105 | #endif |
| 106 | |
| 107 | enum system_states system_state; |
| 108 | EXPORT_SYMBOL(system_state); |
| 109 | |
| 110 | /* |
| 111 | * Boot command-line arguments |
| 112 | */ |
| 113 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 114 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 115 | |
| 116 | extern void time_init(void); |
| 117 | /* Default late time init is NULL. archs can override this later. */ |
| 118 | void (*late_time_init)(void); |
| 119 | extern void softirq_init(void); |
| 120 | |
| 121 | /* Untouched command line (eg. for /proc) saved by arch-specific code. */ |
| 122 | char saved_command_line[COMMAND_LINE_SIZE]; |
| 123 | |
| 124 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 125 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* Setup configured maximum number of CPUs to activate */ |
| 128 | static unsigned int max_cpus = NR_CPUS; |
| 129 | |
| 130 | /* |
| 131 | * Setup routine for controlling SMP activation |
| 132 | * |
| 133 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP |
| 134 | * activation entirely (the MPS table probe still happens, though). |
| 135 | * |
| 136 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer |
| 137 | * greater than 0, limits the maximum number of CPUs activated in |
| 138 | * SMP mode to <NUM>. |
| 139 | */ |
| 140 | static int __init nosmp(char *str) |
| 141 | { |
| 142 | max_cpus = 0; |
| 143 | return 1; |
| 144 | } |
| 145 | |
| 146 | __setup("nosmp", nosmp); |
| 147 | |
| 148 | static int __init maxcpus(char *str) |
| 149 | { |
| 150 | get_option(&str, &max_cpus); |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | __setup("maxcpus=", maxcpus); |
| 155 | |
| 156 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 157 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
| 158 | static const char *panic_later, *panic_param; |
| 159 | |
| 160 | extern struct obs_kernel_param __setup_start[], __setup_end[]; |
| 161 | |
| 162 | static int __init obsolete_checksetup(char *line) |
| 163 | { |
| 164 | struct obs_kernel_param *p; |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame^] | 165 | int had_early_param = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | p = __setup_start; |
| 168 | do { |
| 169 | int n = strlen(p->str); |
| 170 | if (!strncmp(line, p->str, n)) { |
| 171 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame^] | 172 | /* Already done in parse_early_param? |
| 173 | * (Needs exact match on param part). |
| 174 | * Keep iterating, as we can have early |
| 175 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (line[n] == '\0' || line[n] == '=') |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame^] | 177 | had_early_param = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } else if (!p->setup_func) { |
| 179 | printk(KERN_WARNING "Parameter %s is obsolete," |
| 180 | " ignored\n", p->str); |
| 181 | return 1; |
| 182 | } else if (p->setup_func(line + n)) |
| 183 | return 1; |
| 184 | } |
| 185 | p++; |
| 186 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame^] | 187 | |
| 188 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /* |
| 192 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 193 | * still work even if initially too large, it will just take slightly longer |
| 194 | */ |
| 195 | unsigned long loops_per_jiffy = (1<<12); |
| 196 | |
| 197 | EXPORT_SYMBOL(loops_per_jiffy); |
| 198 | |
| 199 | static int __init debug_kernel(char *str) |
| 200 | { |
| 201 | if (*str) |
| 202 | return 0; |
| 203 | console_loglevel = 10; |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | static int __init quiet_kernel(char *str) |
| 208 | { |
| 209 | if (*str) |
| 210 | return 0; |
| 211 | console_loglevel = 4; |
| 212 | return 1; |
| 213 | } |
| 214 | |
| 215 | __setup("debug", debug_kernel); |
| 216 | __setup("quiet", quiet_kernel); |
| 217 | |
| 218 | static int __init loglevel(char *str) |
| 219 | { |
| 220 | get_option(&str, &console_loglevel); |
| 221 | return 1; |
| 222 | } |
| 223 | |
| 224 | __setup("loglevel=", loglevel); |
| 225 | |
| 226 | /* |
| 227 | * Unknown boot options get handed to init, unless they look like |
| 228 | * failed parameters |
| 229 | */ |
| 230 | static int __init unknown_bootoption(char *param, char *val) |
| 231 | { |
| 232 | /* Change NUL term back to "=", to make "param" the whole string. */ |
| 233 | if (val) { |
| 234 | /* param=val or param="val"? */ |
| 235 | if (val == param+strlen(param)+1) |
| 236 | val[-1] = '='; |
| 237 | else if (val == param+strlen(param)+2) { |
| 238 | val[-2] = '='; |
| 239 | memmove(val-1, val, strlen(val)+1); |
| 240 | val--; |
| 241 | } else |
| 242 | BUG(); |
| 243 | } |
| 244 | |
| 245 | /* Handle obsolete-style parameters */ |
| 246 | if (obsolete_checksetup(param)) |
| 247 | return 0; |
| 248 | |
| 249 | /* |
| 250 | * Preemptive maintenance for "why didn't my mispelled command |
| 251 | * line work?" |
| 252 | */ |
| 253 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { |
| 254 | printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | if (panic_later) |
| 259 | return 0; |
| 260 | |
| 261 | if (val) { |
| 262 | /* Environment option */ |
| 263 | unsigned int i; |
| 264 | for (i = 0; envp_init[i]; i++) { |
| 265 | if (i == MAX_INIT_ENVS) { |
| 266 | panic_later = "Too many boot env vars at `%s'"; |
| 267 | panic_param = param; |
| 268 | } |
| 269 | if (!strncmp(param, envp_init[i], val - param)) |
| 270 | break; |
| 271 | } |
| 272 | envp_init[i] = param; |
| 273 | } else { |
| 274 | /* Command line option */ |
| 275 | unsigned int i; |
| 276 | for (i = 0; argv_init[i]; i++) { |
| 277 | if (i == MAX_INIT_ARGS) { |
| 278 | panic_later = "Too many boot init vars at `%s'"; |
| 279 | panic_param = param; |
| 280 | } |
| 281 | } |
| 282 | argv_init[i] = param; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int __init init_setup(char *str) |
| 288 | { |
| 289 | unsigned int i; |
| 290 | |
| 291 | execute_command = str; |
| 292 | /* |
| 293 | * In case LILO is going to boot us with default command line, |
| 294 | * it prepends "auto" before the whole cmdline which makes |
| 295 | * the shell think it should execute a script with such name. |
| 296 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 297 | */ |
| 298 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 299 | argv_init[i] = NULL; |
| 300 | return 1; |
| 301 | } |
| 302 | __setup("init=", init_setup); |
| 303 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 304 | static int __init rdinit_setup(char *str) |
| 305 | { |
| 306 | unsigned int i; |
| 307 | |
| 308 | ramdisk_execute_command = str; |
| 309 | /* See "auto" comment in init_setup */ |
| 310 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 311 | argv_init[i] = NULL; |
| 312 | return 1; |
| 313 | } |
| 314 | __setup("rdinit=", rdinit_setup); |
| 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | #ifndef CONFIG_SMP |
| 317 | |
| 318 | #ifdef CONFIG_X86_LOCAL_APIC |
| 319 | static void __init smp_init(void) |
| 320 | { |
| 321 | APIC_init_uniprocessor(); |
| 322 | } |
| 323 | #else |
| 324 | #define smp_init() do { } while (0) |
| 325 | #endif |
| 326 | |
| 327 | static inline void setup_per_cpu_areas(void) { } |
| 328 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
| 329 | |
| 330 | #else |
| 331 | |
| 332 | #ifdef __GENERIC_PER_CPU |
Eric Dumazet | b73b459 | 2006-03-23 03:01:07 -0800 | [diff] [blame] | 333 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | EXPORT_SYMBOL(__per_cpu_offset); |
| 336 | |
| 337 | static void __init setup_per_cpu_areas(void) |
| 338 | { |
| 339 | unsigned long size, i; |
| 340 | char *ptr; |
Eric Dumazet | 63872f8 | 2006-03-23 03:01:04 -0800 | [diff] [blame] | 341 | unsigned long nr_possible_cpus = num_possible_cpus(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | /* Copy section for each CPU (we discard the original) */ |
| 344 | size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); |
| 345 | #ifdef CONFIG_MODULES |
| 346 | if (size < PERCPU_ENOUGH_ROOM) |
| 347 | size = PERCPU_ENOUGH_ROOM; |
| 348 | #endif |
Eric Dumazet | 63872f8 | 2006-03-23 03:01:04 -0800 | [diff] [blame] | 349 | ptr = alloc_bootmem(size * nr_possible_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
KAMEZAWA Hiroyuki | 0a94502 | 2006-03-28 01:56:37 -0800 | [diff] [blame] | 351 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | __per_cpu_offset[i] = ptr - __per_cpu_start; |
| 353 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
Eric Dumazet | 63872f8 | 2006-03-23 03:01:04 -0800 | [diff] [blame] | 354 | ptr += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | } |
| 357 | #endif /* !__GENERIC_PER_CPU */ |
| 358 | |
| 359 | /* Called by boot processor to activate the rest. */ |
| 360 | static void __init smp_init(void) |
| 361 | { |
| 362 | unsigned int i; |
| 363 | |
| 364 | /* FIXME: This should be done in userspace --RR */ |
| 365 | for_each_present_cpu(i) { |
| 366 | if (num_online_cpus() >= max_cpus) |
| 367 | break; |
| 368 | if (!cpu_online(i)) |
| 369 | cpu_up(i); |
| 370 | } |
| 371 | |
| 372 | /* Any cleanup work */ |
| 373 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); |
| 374 | smp_cpus_done(max_cpus); |
| 375 | #if 0 |
| 376 | /* Get other processors into their bootup holding patterns. */ |
| 377 | |
| 378 | smp_commence(); |
| 379 | #endif |
| 380 | } |
| 381 | |
| 382 | #endif |
| 383 | |
| 384 | /* |
| 385 | * We need to finalize in a non-__init function or else race conditions |
| 386 | * between the root thread and the init thread may cause start_kernel to |
| 387 | * be reaped by free_initmem before the root thread has proceeded to |
| 388 | * cpu_idle. |
| 389 | * |
| 390 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 391 | */ |
| 392 | |
| 393 | static void noinline rest_init(void) |
| 394 | __releases(kernel_lock) |
| 395 | { |
| 396 | kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND); |
| 397 | numa_default_policy(); |
| 398 | unlock_kernel(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 399 | |
| 400 | /* |
| 401 | * The boot idle thread must execute schedule() |
| 402 | * at least one to get things moving: |
| 403 | */ |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 404 | preempt_enable_no_resched(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 405 | schedule(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 406 | preempt_disable(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 407 | |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 408 | /* Call into cpu_idle with preempt disabled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | cpu_idle(); |
| 410 | } |
| 411 | |
| 412 | /* Check for early params. */ |
| 413 | static int __init do_early_param(char *param, char *val) |
| 414 | { |
| 415 | struct obs_kernel_param *p; |
| 416 | |
| 417 | for (p = __setup_start; p < __setup_end; p++) { |
| 418 | if (p->early && strcmp(param, p->str) == 0) { |
| 419 | if (p->setup_func(val) != 0) |
| 420 | printk(KERN_WARNING |
| 421 | "Malformed early option '%s'\n", param); |
| 422 | } |
| 423 | } |
| 424 | /* We accept everything at this stage. */ |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 429 | void __init parse_early_param(void) |
| 430 | { |
| 431 | static __initdata int done = 0; |
| 432 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
| 433 | |
| 434 | if (done) |
| 435 | return; |
| 436 | |
| 437 | /* All fall through to do_early_param. */ |
| 438 | strlcpy(tmp_cmdline, saved_command_line, COMMAND_LINE_SIZE); |
| 439 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); |
| 440 | done = 1; |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Activate the first processor. |
| 445 | */ |
| 446 | |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 447 | static void __init boot_cpu_init(void) |
| 448 | { |
| 449 | int cpu = smp_processor_id(); |
| 450 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
| 451 | cpu_set(cpu, cpu_online_map); |
| 452 | cpu_set(cpu, cpu_present_map); |
| 453 | cpu_set(cpu, cpu_possible_map); |
| 454 | } |
| 455 | |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 456 | void __init __attribute__((weak)) smp_setup_processor_id(void) |
| 457 | { |
| 458 | } |
| 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | asmlinkage void __init start_kernel(void) |
| 461 | { |
| 462 | char * command_line; |
| 463 | extern struct kernel_param __start___param[], __stop___param[]; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 464 | |
| 465 | smp_setup_processor_id(); |
| 466 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 467 | /* |
| 468 | * Need to run as early as possible, to initialize the |
| 469 | * lockdep hash: |
| 470 | */ |
| 471 | lockdep_init(); |
| 472 | |
| 473 | local_irq_disable(); |
| 474 | early_boot_irqs_off(); |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 475 | early_init_irq_lock_class(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | /* |
| 478 | * Interrupts are still disabled. Do necessary setups, then |
| 479 | * enable them |
| 480 | */ |
| 481 | lock_kernel(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 482 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | page_address_init(); |
| 484 | printk(KERN_NOTICE); |
| 485 | printk(linux_banner); |
| 486 | setup_arch(&command_line); |
| 487 | setup_per_cpu_areas(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 488 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * Set up the scheduler prior starting any interrupts (such as the |
| 492 | * timer interrupt). Full topology setup happens at smp_init() |
| 493 | * time - but meanwhile we still have a functioning scheduler. |
| 494 | */ |
| 495 | sched_init(); |
| 496 | /* |
| 497 | * Disable preemption - early bootup scheduling is extremely |
| 498 | * fragile until we cpu_idle() for the first time. |
| 499 | */ |
| 500 | preempt_disable(); |
| 501 | build_all_zonelists(); |
| 502 | page_alloc_init(); |
| 503 | printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line); |
| 504 | parse_early_param(); |
| 505 | parse_args("Booting kernel", command_line, __start___param, |
| 506 | __stop___param - __start___param, |
| 507 | &unknown_bootoption); |
| 508 | sort_main_extable(); |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 509 | unwind_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | trap_init(); |
| 511 | rcu_init(); |
| 512 | init_IRQ(); |
| 513 | pidhash_init(); |
| 514 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 515 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 517 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 518 | time_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 519 | profile_init(); |
| 520 | if (!irqs_disabled()) |
| 521 | printk("start_kernel(): bug: interrupts were enabled early\n"); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 522 | early_boot_irqs_on(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 523 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | /* |
| 526 | * HACK ALERT! This is early. We're enabling the console before |
| 527 | * we've done PCI setups etc, and console_init() must be aware of |
| 528 | * this. But we do want output early, in case something goes wrong. |
| 529 | */ |
| 530 | console_init(); |
| 531 | if (panic_later) |
| 532 | panic(panic_later, panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 533 | |
| 534 | lockdep_info(); |
| 535 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 536 | /* |
| 537 | * Need to run this when irqs are enabled, because it wants |
| 538 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 539 | * too: |
| 540 | */ |
| 541 | locking_selftest(); |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | #ifdef CONFIG_BLK_DEV_INITRD |
| 544 | if (initrd_start && !initrd_below_start_ok && |
| 545 | initrd_start < min_low_pfn << PAGE_SHIFT) { |
| 546 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
| 547 | "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT); |
| 548 | initrd_start = 0; |
| 549 | } |
| 550 | #endif |
| 551 | vfs_caches_init_early(); |
Paul Jackson | c417f02 | 2006-01-08 01:02:01 -0800 | [diff] [blame] | 552 | cpuset_init_early(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | mem_init(); |
| 554 | kmem_cache_init(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 555 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | numa_policy_init(); |
| 557 | if (late_time_init) |
| 558 | late_time_init(); |
| 559 | calibrate_delay(); |
| 560 | pidmap_init(); |
| 561 | pgtable_cache_init(); |
| 562 | prio_tree_init(); |
| 563 | anon_vma_init(); |
| 564 | #ifdef CONFIG_X86 |
| 565 | if (efi_enabled) |
| 566 | efi_enter_virtual_mode(); |
| 567 | #endif |
| 568 | fork_init(num_physpages); |
| 569 | proc_caches_init(); |
| 570 | buffer_init(); |
| 571 | unnamed_dev_init(); |
| 572 | key_init(); |
| 573 | security_init(); |
| 574 | vfs_caches_init(num_physpages); |
| 575 | radix_tree_init(); |
| 576 | signals_init(); |
| 577 | /* rootfs populating might need page-writeback */ |
| 578 | page_writeback_init(); |
| 579 | #ifdef CONFIG_PROC_FS |
| 580 | proc_root_init(); |
| 581 | #endif |
| 582 | cpuset_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 583 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 584 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | check_bugs(); |
| 587 | |
| 588 | acpi_early_init(); /* before LAPIC and SMP init */ |
| 589 | |
| 590 | /* Do the rest non-__init'ed, we're now alive */ |
| 591 | rest_init(); |
| 592 | } |
| 593 | |
| 594 | static int __initdata initcall_debug; |
| 595 | |
| 596 | static int __init initcall_debug_setup(char *str) |
| 597 | { |
| 598 | initcall_debug = 1; |
| 599 | return 1; |
| 600 | } |
| 601 | __setup("initcall_debug", initcall_debug_setup); |
| 602 | |
| 603 | struct task_struct *child_reaper = &init_task; |
| 604 | |
| 605 | extern initcall_t __initcall_start[], __initcall_end[]; |
| 606 | |
| 607 | static void __init do_initcalls(void) |
| 608 | { |
| 609 | initcall_t *call; |
| 610 | int count = preempt_count(); |
| 611 | |
| 612 | for (call = __initcall_start; call < __initcall_end; call++) { |
Andrew Morton | c1cda48 | 2006-03-25 03:07:15 -0800 | [diff] [blame] | 613 | char *msg = NULL; |
| 614 | char msgbuf[40]; |
| 615 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | if (initcall_debug) { |
Andrew Morton | c1cda48 | 2006-03-25 03:07:15 -0800 | [diff] [blame] | 618 | printk("Calling initcall 0x%p", *call); |
| 619 | print_fn_descriptor_symbol(": %s()", |
| 620 | (unsigned long) *call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | printk("\n"); |
| 622 | } |
| 623 | |
Andrew Morton | c1cda48 | 2006-03-25 03:07:15 -0800 | [diff] [blame] | 624 | result = (*call)(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Andrew Morton | f3a19cb | 2006-05-01 12:15:52 -0700 | [diff] [blame] | 626 | if (result && result != -ENODEV && initcall_debug) { |
Andrew Morton | c1cda48 | 2006-03-25 03:07:15 -0800 | [diff] [blame] | 627 | sprintf(msgbuf, "error code %d", result); |
| 628 | msg = msgbuf; |
| 629 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | if (preempt_count() != count) { |
| 631 | msg = "preemption imbalance"; |
| 632 | preempt_count() = count; |
| 633 | } |
| 634 | if (irqs_disabled()) { |
| 635 | msg = "disabled interrupts"; |
| 636 | local_irq_enable(); |
| 637 | } |
| 638 | if (msg) { |
Andrew Morton | c1cda48 | 2006-03-25 03:07:15 -0800 | [diff] [blame] | 639 | printk(KERN_WARNING "initcall at 0x%p", *call); |
| 640 | print_fn_descriptor_symbol(": %s()", |
| 641 | (unsigned long) *call); |
| 642 | printk(": returned with %s\n", msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | } |
| 645 | |
| 646 | /* Make sure there is no pending stuff from the initcall sequence */ |
| 647 | flush_scheduled_work(); |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * Ok, the machine is now initialized. None of the devices |
| 652 | * have been touched yet, but the CPU subsystem is up and |
| 653 | * running, and memory and process management works. |
| 654 | * |
| 655 | * Now we can finally start doing some real work.. |
| 656 | */ |
| 657 | static void __init do_basic_setup(void) |
| 658 | { |
| 659 | /* drivers will send hotplug events */ |
| 660 | init_workqueues(); |
| 661 | usermodehelper_init(); |
| 662 | driver_init(); |
| 663 | |
| 664 | #ifdef CONFIG_SYSCTL |
| 665 | sysctl_init(); |
| 666 | #endif |
| 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | do_initcalls(); |
| 669 | } |
| 670 | |
| 671 | static void do_pre_smp_initcalls(void) |
| 672 | { |
| 673 | extern int spawn_ksoftirqd(void); |
| 674 | #ifdef CONFIG_SMP |
| 675 | extern int migration_init(void); |
| 676 | |
| 677 | migration_init(); |
| 678 | #endif |
| 679 | spawn_ksoftirqd(); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 680 | spawn_softlockup_task(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | static void run_init_process(char *init_filename) |
| 684 | { |
| 685 | argv_init[0] = init_filename; |
| 686 | execve(init_filename, argv_init, envp_init); |
| 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | static int init(void * unused) |
| 690 | { |
| 691 | lock_kernel(); |
| 692 | /* |
| 693 | * init can run on any cpu. |
| 694 | */ |
| 695 | set_cpus_allowed(current, CPU_MASK_ALL); |
| 696 | /* |
| 697 | * Tell the world that we're going to be the grim |
| 698 | * reaper of innocent orphaned children. |
| 699 | * |
| 700 | * We don't want people to have to make incorrect |
| 701 | * assumptions about where in the task array this |
| 702 | * can be found. |
| 703 | */ |
| 704 | child_reaper = current; |
| 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | smp_prepare_cpus(max_cpus); |
| 707 | |
| 708 | do_pre_smp_initcalls(); |
| 709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | smp_init(); |
| 711 | sched_init_smp(); |
| 712 | |
| 713 | cpuset_init_smp(); |
| 714 | |
| 715 | /* |
| 716 | * Do this before initcalls, because some drivers want to access |
| 717 | * firmware files. |
| 718 | */ |
| 719 | populate_rootfs(); |
| 720 | |
| 721 | do_basic_setup(); |
| 722 | |
| 723 | /* |
| 724 | * check if there is an early userspace init. If yes, let it do all |
| 725 | * the work |
| 726 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 727 | |
| 728 | if (!ramdisk_execute_command) |
| 729 | ramdisk_execute_command = "/init"; |
| 730 | |
| 731 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 732 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /* |
| 737 | * Ok, we have completed the initial bootup, and |
| 738 | * we're essentially up and running. Get rid of the |
| 739 | * initmem segments and start the user-mode stuff.. |
| 740 | */ |
| 741 | free_initmem(); |
| 742 | unlock_kernel(); |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 743 | mark_rodata_ro(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | system_state = SYSTEM_RUNNING; |
| 745 | numa_default_policy(); |
| 746 | |
| 747 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
| 748 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
| 749 | |
| 750 | (void) sys_dup(0); |
| 751 | (void) sys_dup(0); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 752 | |
| 753 | if (ramdisk_execute_command) { |
| 754 | run_init_process(ramdisk_execute_command); |
| 755 | printk(KERN_WARNING "Failed to execute %s\n", |
| 756 | ramdisk_execute_command); |
| 757 | } |
| 758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | /* |
| 760 | * We try each of these until one succeeds. |
| 761 | * |
| 762 | * The Bourne shell can be used instead of init if we are |
| 763 | * trying to recover a really broken machine. |
| 764 | */ |
Avery, Brian | c1d7ef7 | 2005-09-06 15:16:56 -0700 | [diff] [blame] | 765 | if (execute_command) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | run_init_process(execute_command); |
Avery, Brian | c1d7ef7 | 2005-09-06 15:16:56 -0700 | [diff] [blame] | 767 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
| 768 | "defaults...\n", execute_command); |
| 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | run_init_process("/sbin/init"); |
| 771 | run_init_process("/etc/init"); |
| 772 | run_init_process("/bin/init"); |
| 773 | run_init_process("/bin/sh"); |
| 774 | |
| 775 | panic("No init found. Try passing init= option to kernel."); |
| 776 | } |