root/include/linux/sched.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. add_wait_queue
  2. remove_wait_queue
  3. select_wait
  4. down
  5. up
  6. _get_base
  7. get_limit

   1 #ifndef _LINUX_SCHED_H
   2 #define _LINUX_SCHED_H
   3 
   4 #define NEW_SWAP
   5 
   6 /*
   7  * define DEBUG if you want the wait-queues to have some extra
   8  * debugging code. It's not normally used, but might catch some
   9  * wait-queue coding errors.
  10  *
  11  *  #define DEBUG
  12  */
  13 
  14 #define HZ 100
  15 
  16 /*
  17  * System setup flags..
  18  */
  19 extern int hard_math;
  20 extern int x86;
  21 extern int ignore_irq13;
  22 extern int wp_works_ok;
  23 
  24 extern unsigned long intr_count;
  25 
  26 #define start_bh_atomic() \
  27 __asm__ __volatile__("incl _intr_count")
  28 
  29 #define end_bh_atomic() \
  30 __asm__ __volatile__("decl _intr_count")
  31 
  32 /*
  33  * Bus types (default is ISA, but people can check others with these..)
  34  * MCA_bus hardcoded to 0 for now.
  35  */
  36 extern int EISA_bus;
  37 #define MCA_bus 0
  38 
  39 #include <linux/binfmts.h>
  40 #include <linux/personality.h>
  41 #include <linux/tasks.h>
  42 #include <asm/system.h>
  43 
  44 /*
  45  * User space process size: 3GB. This is hardcoded into a few places,
  46  * so don't change it unless you know what you are doing.
  47  */
  48 #define TASK_SIZE       0xc0000000
  49 
  50 /*
  51  * Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
  52  */
  53 #define IO_BITMAP_SIZE  32
  54 
  55 /*
  56  * These are the constant used to fake the fixed-point load-average
  57  * counting. Some notes:
  58  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  59  *    a load-average precision of 10 bits integer + 11 bits fractional
  60  *  - if you want to count load-averages more often, you need more
  61  *    precision, or rounding will get you. With 2-second counting freq,
  62  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
  63  *    11 bit fractions.
  64  */
  65 extern unsigned long avenrun[];         /* Load averages */
  66 
  67 #define FSHIFT          11              /* nr of bits of precision */
  68 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
  69 #define LOAD_FREQ       (5*HZ)          /* 5 sec intervals */
  70 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
  71 #define EXP_5           2014            /* 1/exp(5sec/5min) */
  72 #define EXP_15          2037            /* 1/exp(5sec/15min) */
  73 
  74 #define CALC_LOAD(load,exp,n) \
  75         load *= exp; \
  76         load += n*(FIXED_1-exp); \
  77         load >>= FSHIFT;
  78 
  79 #define CT_TO_SECS(x)   ((x) / HZ)
  80 #define CT_TO_USECS(x)  (((x) % HZ) * 1000000/HZ)
  81 
  82 #define FIRST_TASK task[0]
  83 #define LAST_TASK task[NR_TASKS-1]
  84 
  85 #include <linux/head.h>
  86 #include <linux/fs.h>
  87 #include <linux/mm.h>
  88 #include <linux/signal.h>
  89 #include <linux/time.h>
  90 #include <linux/param.h>
  91 #include <linux/resource.h>
  92 #include <linux/vm86.h>
  93 #include <linux/math_emu.h>
  94 #include <linux/ptrace.h>
  95 
  96 #define TASK_RUNNING            0
  97 #define TASK_INTERRUPTIBLE      1
  98 #define TASK_UNINTERRUPTIBLE    2
  99 #define TASK_ZOMBIE             3
 100 #define TASK_STOPPED            4
 101 #define TASK_SWAPPING           5
 102 
 103 #ifndef NULL
 104 #define NULL ((void *) 0)
 105 #endif
 106 
 107 #ifdef __KERNEL__
 108 
 109 extern void sched_init(void);
 110 extern void show_state(void);
 111 extern void trap_init(void);
 112 
 113 asmlinkage void schedule(void);
 114 
 115 #endif /* __KERNEL__ */
 116 
 117 struct i387_hard_struct {
 118         long    cwd;
 119         long    swd;
 120         long    twd;
 121         long    fip;
 122         long    fcs;
 123         long    foo;
 124         long    fos;
 125         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 126 };
 127 
 128 struct i387_soft_struct {
 129         long    cwd;
 130         long    swd;
 131         long    twd;
 132         long    fip;
 133         long    fcs;
 134         long    foo;
 135         long    fos;
 136         long    top;
 137         struct fpu_reg  regs[8];        /* 8*16 bytes for each FP-reg = 128 bytes */
 138         unsigned char   lookahead;
 139         struct info     *info;
 140         unsigned long   entry_eip;
 141 };
 142 
 143 union i387_union {
 144         struct i387_hard_struct hard;
 145         struct i387_soft_struct soft;
 146 };
 147 
 148 struct tss_struct {
 149         unsigned short  back_link,__blh;
 150         unsigned long   esp0;
 151         unsigned short  ss0,__ss0h;
 152         unsigned long   esp1;
 153         unsigned short  ss1,__ss1h;
 154         unsigned long   esp2;
 155         unsigned short  ss2,__ss2h;
 156         unsigned long   cr3;
 157         unsigned long   eip;
 158         unsigned long   eflags;
 159         unsigned long   eax,ecx,edx,ebx;
 160         unsigned long   esp;
 161         unsigned long   ebp;
 162         unsigned long   esi;
 163         unsigned long   edi;
 164         unsigned short  es, __esh;
 165         unsigned short  cs, __csh;
 166         unsigned short  ss, __ssh;
 167         unsigned short  ds, __dsh;
 168         unsigned short  fs, __fsh;
 169         unsigned short  gs, __gsh;
 170         unsigned short  ldt, __ldth;
 171         unsigned short  trace, bitmap;
 172         unsigned long   io_bitmap[IO_BITMAP_SIZE+1];
 173         unsigned long   tr;
 174         unsigned long   cr2, trap_no, error_code;
 175         union i387_union i387;
 176 };
 177 
 178 #define INIT_TSS  { \
 179         0,0, \
 180         sizeof(init_kernel_stack) + (long) &init_kernel_stack, \
 181         KERNEL_DS, 0, \
 182         0,0,0,0,0,0, \
 183         (long) &swapper_pg_dir, \
 184         0,0,0,0,0,0,0,0,0,0, \
 185         USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0, \
 186         _LDT(0),0, \
 187         0, 0x8000, \
 188         {~0, }, /* ioperm */ \
 189         _TSS(0), 0, 0,0, \
 190         { { 0, }, }  /* 387 state */ \
 191 }
 192 
 193 struct files_struct {
 194         int count;
 195         fd_set close_on_exec;
 196         struct file * fd[NR_OPEN];
 197 };
 198 
 199 #define INIT_FILES { \
 200         0, \
 201         { { 0, } }, \
 202         { NULL, } \
 203 }
 204 
 205 struct fs_struct {
 206         int count;
 207         unsigned short umask;
 208         struct inode * root, * pwd;
 209 };
 210 
 211 #define INIT_FS { \
 212         0, \
 213         0022, \
 214         NULL, NULL \
 215 }
 216 
 217 struct mm_struct {
 218         int count;
 219         unsigned long start_code, end_code, end_data;
 220         unsigned long start_brk, brk, start_stack, start_mmap;
 221         unsigned long arg_start, arg_end, env_start, env_end;
 222         unsigned long rss;
 223         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 224         int swappable:1;
 225 #ifdef NEW_SWAP
 226         unsigned long old_maj_flt;      /* old value of maj_flt */
 227         unsigned long dec_flt;          /* page fault count of the last time */
 228         unsigned long swap_cnt;         /* number of pages to swap on next pass */
 229         short swap_table;               /* current page table */
 230         short swap_page;                /* current page */
 231 #endif NEW_SWAP
 232         struct vm_area_struct * mmap;
 233 };
 234 
 235 #define INIT_MM { \
 236                 0, \
 237                 0, 0, 0, \
 238                 0, 0, 0, 0, \
 239                 0, 0, 0, 0, \
 240                 0, \
 241 /* ?_flt */     0, 0, 0, 0, \
 242                 0, \
 243 /* swap */      0, 0, 0, 0, 0, \
 244                 NULL }
 245 
 246 struct task_struct {
 247 /* these are hardcoded - don't touch */
 248         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
 249         long counter;
 250         long priority;
 251         unsigned long signal;
 252         unsigned long blocked;  /* bitmap of masked signals */
 253         unsigned long flags;    /* per process flags, defined below */
 254         int errno;
 255         int debugreg[8];  /* Hardware debugging registers */
 256         struct exec_domain *exec_domain;
 257 /* various fields */
 258         struct linux_binfmt *binfmt;
 259         struct task_struct *next_task, *prev_task;
 260         struct sigaction sigaction[32];
 261         unsigned long saved_kernel_stack;
 262         unsigned long kernel_stack_page;
 263         int exit_code, exit_signal;
 264         unsigned long personality;
 265         int dumpable:1;
 266         int did_exec:1;
 267         int pid,pgrp,session,leader;
 268         int     groups[NGROUPS];
 269         /* 
 270          * pointers to (original) parent process, youngest child, younger sibling,
 271          * older sibling, respectively.  (p->father can be replaced with 
 272          * p->p_pptr->pid)
 273          */
 274         struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
 275         struct wait_queue *wait_chldexit;       /* for wait4() */
 276         unsigned short uid,euid,suid;
 277         unsigned short gid,egid,sgid;
 278         unsigned long timeout;
 279         unsigned long it_real_value, it_prof_value, it_virt_value;
 280         unsigned long it_real_incr, it_prof_incr, it_virt_incr;
 281         long utime, stime, cutime, cstime, start_time;
 282         struct rlimit rlim[RLIM_NLIMITS]; 
 283         unsigned short used_math;
 284         char comm[16];
 285 /* virtual 86 mode stuff */
 286         struct vm86_struct * vm86_info;
 287         unsigned long screen_bitmap;
 288         unsigned long v86flags, v86mask, v86mode;
 289 /* file system info */
 290         int link_count;
 291         struct tty_struct *tty; /* NULL if no tty */
 292         struct inode * executable;
 293         struct shm_desc *shm;
 294         struct sem_undo *semun;
 295 /* ldt for this task - used by Wine.  If NULL, default_ldt is used */
 296         struct desc_struct *ldt;
 297 /* tss for this task */
 298         struct tss_struct tss;
 299 /* filesystem information */
 300         struct fs_struct fs[1];
 301 /* open file information */
 302         struct files_struct files[1];
 303 /* memory management info */
 304         struct mm_struct mm[1];
 305 };
 306 
 307 /*
 308  * Per process flags
 309  */
 310 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
 311                                         /* Not implemented yet, only for 486*/
 312 #define PF_PTRACED      0x00000010      /* set if ptrace (0) has been called. */
 313 #define PF_TRACESYS     0x00000020      /* tracing system calls */
 314 
 315 /*
 316  * cloning flags:
 317  */
 318 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
 319 #define COPYVM          0x00000100      /* set if VM copy desired (like normal fork()) */
 320 #define COPYFD          0x00000200      /* set if fd's should be copied, not shared (NI) */
 321 
 322 /*
 323  *  INIT_TASK is used to set up the first task table, touch at
 324  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 325  */
 326 #define INIT_TASK \
 327 /* state etc */ { 0,15,15,0,0,0,0, \
 328 /* debugregs */ { 0, },            \
 329 /* exec domain */&default_exec_domain, \
 330 /* binfmt */    NULL, \
 331 /* schedlink */ &init_task,&init_task, \
 332 /* signals */   {{ 0, },}, \
 333 /* stack */     0,(unsigned long) &init_kernel_stack, \
 334 /* ec,brk... */ 0,0,0,0,0, \
 335 /* pid etc.. */ 0,0,0,0, \
 336 /* suppl grps*/ {NOGROUP,}, \
 337 /* proc links*/ &init_task,&init_task,NULL,NULL,NULL,NULL, \
 338 /* uid etc */   0,0,0,0,0,0, \
 339 /* timeout */   0,0,0,0,0,0,0,0,0,0,0,0, \
 340 /* rlimits */   { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX},  \
 341                   {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX},  \
 342                   {       0, LONG_MAX}, {LONG_MAX, LONG_MAX}}, \
 343 /* math */      0, \
 344 /* comm */      "swapper", \
 345 /* vm86_info */ NULL, 0, 0, 0, 0, \
 346 /* fs info */   0,NULL,NULL, \
 347 /* ipc */       NULL, NULL, \
 348 /* ldt */       NULL, \
 349 /* tss */       INIT_TSS, \
 350 /* fs */        { INIT_FS }, \
 351 /* files */     { INIT_FILES }, \
 352 /* mm */        { INIT_MM } \
 353 }
 354 
 355 #ifdef __KERNEL__
 356 
 357 extern struct task_struct init_task;
 358 extern struct task_struct *task[NR_TASKS];
 359 extern struct task_struct *last_task_used_math;
 360 extern struct task_struct *current;
 361 extern unsigned long volatile jiffies;
 362 extern unsigned long itimer_ticks;
 363 extern unsigned long itimer_next;
 364 extern struct timeval xtime;
 365 extern int need_resched;
 366 
 367 #define CURRENT_TIME (xtime.tv_sec)
 368 
 369 extern void sleep_on(struct wait_queue ** p);
 370 extern void interruptible_sleep_on(struct wait_queue ** p);
 371 extern void wake_up(struct wait_queue ** p);
 372 extern void wake_up_interruptible(struct wait_queue ** p);
 373 
 374 extern void notify_parent(struct task_struct * tsk);
 375 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
 376 extern int in_group_p(gid_t grp);
 377 
 378 extern int request_irq(unsigned int irq,void (*handler)(int));
 379 extern void free_irq(unsigned int irq);
 380 extern int irqaction(unsigned int irq,struct sigaction * sa);
 381 
 382 /*
 383  * Entry into gdt where to find first TSS. GDT layout:
 384  *   0 - nul
 385  *   1 - kernel code segment
 386  *   2 - kernel data segment
 387  *   3 - user code segment
 388  *   4 - user data segment
 389  * ...
 390  *   8 - TSS #0
 391  *   9 - LDT #0
 392  *  10 - TSS #1
 393  *  11 - LDT #1
 394  */
 395 #define FIRST_TSS_ENTRY 8
 396 #define FIRST_LDT_ENTRY (FIRST_TSS_ENTRY+1)
 397 #define _TSS(n) ((((unsigned long) n)<<4)+(FIRST_TSS_ENTRY<<3))
 398 #define _LDT(n) ((((unsigned long) n)<<4)+(FIRST_LDT_ENTRY<<3))
 399 #define load_TR(n) __asm__("ltr %%ax": /* no output */ :"a" (_TSS(n)))
 400 #define load_ldt(n) __asm__("lldt %%ax": /* no output */ :"a" (_LDT(n)))
 401 #define store_TR(n) \
 402 __asm__("str %%ax\n\t" \
 403         "subl %2,%%eax\n\t" \
 404         "shrl $4,%%eax" \
 405         :"=a" (n) \
 406         :"0" (0),"i" (FIRST_TSS_ENTRY<<3))
 407 /*
 408  *      switch_to(n) should switch tasks to task nr n, first
 409  * checking that n isn't the current task, in which case it does nothing.
 410  * This also clears the TS-flag if the task we switched to has used
 411  * tha math co-processor latest.
 412  */
 413 #define switch_to(tsk) \
 414 __asm__("cli\n\t" \
 415         "xchgl %%ecx,_current\n\t" \
 416         "ljmp %0\n\t" \
 417         "sti\n\t" \
 418         "cmpl %%ecx,_last_task_used_math\n\t" \
 419         "jne 1f\n\t" \
 420         "clts\n" \
 421         "1:" \
 422         : /* no output */ \
 423         :"m" (*(((char *)&tsk->tss.tr)-4)), \
 424          "c" (tsk) \
 425         :"cx")
 426 
 427 #define _set_base(addr,base) \
 428 __asm__("movw %%dx,%0\n\t" \
 429         "rorl $16,%%edx\n\t" \
 430         "movb %%dl,%1\n\t" \
 431         "movb %%dh,%2" \
 432         : /* no output */ \
 433         :"m" (*((addr)+2)), \
 434          "m" (*((addr)+4)), \
 435          "m" (*((addr)+7)), \
 436          "d" (base) \
 437         :"dx")
 438 
 439 #define _set_limit(addr,limit) \
 440 __asm__("movw %%dx,%0\n\t" \
 441         "rorl $16,%%edx\n\t" \
 442         "movb %1,%%dh\n\t" \
 443         "andb $0xf0,%%dh\n\t" \
 444         "orb %%dh,%%dl\n\t" \
 445         "movb %%dl,%1" \
 446         : /* no output */ \
 447         :"m" (*(addr)), \
 448          "m" (*((addr)+6)), \
 449          "d" (limit) \
 450         :"dx")
 451 
 452 #define set_base(ldt,base) _set_base( ((char *)&(ldt)) , base )
 453 #define set_limit(ldt,limit) _set_limit( ((char *)&(ldt)) , (limit-1)>>12 )
 454 
 455 /*
 456  * The wait-queues are circular lists, and you have to be *very* sure
 457  * to keep them correct. Use only these two functions to add/remove
 458  * entries in the queues.
 459  */
 460 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
     /* [previous][next][first][last][top][bottom][index][help] */
 461 {
 462         unsigned long flags;
 463 
 464 #ifdef DEBUG
 465         if (wait->next) {
 466                 unsigned long pc;
 467                 __asm__ __volatile__("call 1f\n"
 468                         "1:\tpopl %0":"=r" (pc));
 469                 printk("add_wait_queue (%08x): wait->next = %08x\n",pc,(unsigned long) wait->next);
 470         }
 471 #endif
 472         save_flags(flags);
 473         cli();
 474         if (!*p) {
 475                 wait->next = wait;
 476                 *p = wait;
 477         } else {
 478                 wait->next = (*p)->next;
 479                 (*p)->next = wait;
 480         }
 481         restore_flags(flags);
 482 }
 483 
 484 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
     /* [previous][next][first][last][top][bottom][index][help] */
 485 {
 486         unsigned long flags;
 487         struct wait_queue * tmp;
 488 #ifdef DEBUG
 489         unsigned long ok = 0;
 490 #endif
 491 
 492         save_flags(flags);
 493         cli();
 494         if ((*p == wait) &&
 495 #ifdef DEBUG
 496             (ok = 1) &&
 497 #endif
 498             ((*p = wait->next) == wait)) {
 499                 *p = NULL;
 500         } else {
 501                 tmp = wait;
 502                 while (tmp->next != wait) {
 503                         tmp = tmp->next;
 504 #ifdef DEBUG
 505                         if (tmp == *p)
 506                                 ok = 1;
 507 #endif
 508                 }
 509                 tmp->next = wait->next;
 510         }
 511         wait->next = NULL;
 512         restore_flags(flags);
 513 #ifdef DEBUG
 514         if (!ok) {
 515                 printk("removed wait_queue not on list.\n");
 516                 printk("list = %08x, queue = %08x\n",(unsigned long) p, (unsigned long) wait);
 517                 __asm__("call 1f\n1:\tpopl %0":"=r" (ok));
 518                 printk("eip = %08x\n",ok);
 519         }
 520 #endif
 521 }
 522 
 523 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
     /* [previous][next][first][last][top][bottom][index][help] */
 524 {
 525         struct select_table_entry * entry;
 526 
 527         if (!p || !wait_address)
 528                 return;
 529         if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
 530                 return;
 531         entry = p->entry + p->nr;
 532         entry->wait_address = wait_address;
 533         entry->wait.task = current;
 534         entry->wait.next = NULL;
 535         add_wait_queue(wait_address,&entry->wait);
 536         p->nr++;
 537 }
 538 
 539 extern void __down(struct semaphore * sem);
 540 
 541 /*
 542  * These are not yet interrupt-safe
 543  */
 544 extern inline void down(struct semaphore * sem)
     /* [previous][next][first][last][top][bottom][index][help] */
 545 {
 546         if (sem->count <= 0)
 547                 __down(sem);
 548         sem->count--;
 549 }
 550 
 551 extern inline void up(struct semaphore * sem)
     /* [previous][next][first][last][top][bottom][index][help] */
 552 {
 553         sem->count++;
 554         wake_up(&sem->wait);
 555 }       
 556 
 557 static inline unsigned long _get_base(char * addr)
     /* [previous][next][first][last][top][bottom][index][help] */
 558 {
 559         unsigned long __base;
 560         __asm__("movb %3,%%dh\n\t"
 561                 "movb %2,%%dl\n\t"
 562                 "shll $16,%%edx\n\t"
 563                 "movw %1,%%dx"
 564                 :"=&d" (__base)
 565                 :"m" (*((addr)+2)),
 566                  "m" (*((addr)+4)),
 567                  "m" (*((addr)+7)));
 568         return __base;
 569 }
 570 
 571 #define get_base(ldt) _get_base( ((char *)&(ldt)) )
 572 
 573 static inline unsigned long get_limit(unsigned long segment)
     /* [previous][next][first][last][top][bottom][index][help] */
 574 {
 575         unsigned long __limit;
 576         __asm__("lsll %1,%0"
 577                 :"=r" (__limit):"r" (segment));
 578         return __limit+1;
 579 }
 580 
 581 #define REMOVE_LINKS(p) do { unsigned long flags; \
 582         save_flags(flags) ; cli(); \
 583         (p)->next_task->prev_task = (p)->prev_task; \
 584         (p)->prev_task->next_task = (p)->next_task; \
 585         restore_flags(flags); \
 586         if ((p)->p_osptr) \
 587                 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
 588         if ((p)->p_ysptr) \
 589                 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
 590         else \
 591                 (p)->p_pptr->p_cptr = (p)->p_osptr; \
 592         } while (0)
 593 
 594 #define SET_LINKS(p) do { unsigned long flags; \
 595         save_flags(flags); cli(); \
 596         (p)->next_task = &init_task; \
 597         (p)->prev_task = init_task.prev_task; \
 598         init_task.prev_task->next_task = (p); \
 599         init_task.prev_task = (p); \
 600         restore_flags(flags); \
 601         (p)->p_ysptr = NULL; \
 602         if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
 603                 (p)->p_osptr->p_ysptr = p; \
 604         (p)->p_pptr->p_cptr = p; \
 605         } while (0)
 606 
 607 #define for_each_task(p) \
 608         for (p = &init_task ; (p = p->next_task) != &init_task ; )
 609 
 610 /*
 611  * This is the ldt that every process will get unless we need
 612  * something other than this.
 613  */
 614 extern struct desc_struct default_ldt;
 615 
 616 /* This special macro can be used to load a debugging register */
 617 
 618 #define loaddebug(register) \
 619                 __asm__("movl %0,%%edx\n\t" \
 620                         "movl %%edx,%%db" #register "\n\t" \
 621                         : /* no output */ \
 622                         :"m" (current->debugreg[register]) \
 623                         :"dx");
 624 
 625 #endif /* __KERNEL__ */
 626 
 627 #endif

/* [previous][next][first][last][top][bottom][index][help] */